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summarize: The original series is set in Vienna and focuses on the three-man staff of an office of the Kriminalpolizei - the Austrian Criminal Police - specifically a "Mordkommission" (homicide unit). In addition to the three policemen, the office is staffed by a German Shepherd called Rex, the main star of the show, who functions variously as a cadaver dog, a sniffer dog (for both contraband and narcotics) and as another pair of eyes and ears for his team. The original team at the office consisted of Richard Moser, Ernst Stockinger and Peter Höllerer. This team was also assisted by forensic expert Dr Leo Graf and retired policeman Max Koch. The show had many changes in characters, including Christian Böck replacing Stockinger, Alexander Brandtner replacing Moser and former statistics officer Fritz Kunz replacing Höllerer. The final Austrian incarnation of the series featured a male-female duo of the clumsy Marc Hoffmann and a female officer Nikki Herzog working alongside Kunz. Dr. Graf is the only character to remain for the entire Austrian production of the series. In season eleven, the action moves to Rome, with Inspector Lorenzo Fabbri taking charge of the dog. Episodes were produced in both Italian and German. At the end of the season, Rex is apparently mortally wounded when he jumps on Fabbri's head to protect him from a bullet, but is shown in close-up still slightly breathing just before credits roll. The beginning of season 12 shows that Rex survived the bullet, when Fabbri takes Rex to the animal hospital. For the first ten seasons the show was scripted entirely in German, where most characters spoke with Austrian dialects. It was shot on location in Vienna and its surroundings, though the usage of areas in production was often geographically incorrect. While subtitles were used for most international markets, the series was dubbed in some countries, including France, Greece, Italy and Spain. Following declining ratings during the eighth and ninth seasons, the series was cancelled mid-production in 2004, leaving the tenth and then final season with only four episodes and no finale that concluded the story. As the series was still highly popular abroad, particularly in Italy and Australia, the show remained in syndication for many years. In 2007, following negotiations, Italian broadcaster RAI secured the rights to revive the series, with production moving to Rome. For the first season of the new series, numbered as season eleven, it was produced in both Austria and Italy, with production moving to Italy full-time for the twelfth season. A total of eighteen seasons were produced, the last airing in 2015, barring repeats. While occasional episodes were set in Austria, the series was scripted and filmed primarily in Italian from 2008 to the concluding 2015 season. For Australian markets, season numbering was altered for airing on SBS, and this numbering was also used on the DVD sets, leaving some viewers confused as to how the European episode lists correspond with the Australian ones. For the DVD sets, seasons 1 to 8 have been re-arranged to seven longer seasons (the chronological episode order remaining unchanged), with the ninth and tenth season being labeled as "season eight". They have since followed the official lists, with season eleven labeled as season nine, season twelve as season ten and so on. A trained police dog, Rex (revealed in the Pilot to be registered as "Reginald von Ravenhorst") is the legitimate star of the show. Establishing shots frequently show him demonstrating a new trick - unlatching doors, pushing trolleys, pointing to drugs or corpses - which then turn out to be useful in the course of the episode. He is often used to stalk suspects, often with a GPS-type object attached to him so that the officers can keep track. Rex was stolen by criminals as a pup, but managed to escape and befriend a boy, where he helped to solve his first case with the boy. Initially, Rex and Moser share an apartment at Marokkanergasse 18, Wien-Landstraße, however the pair go house-hunting quite early in the series. The house they eventually find is owned by a man who does not want dogs there, however Rex is able to alert him to a gas leak and in gratitude he allows Moser and Rex to stay. Rex is frequently called upon to resolve difficult situations, including helping a young girl in shock, preventing a woman from committing suicide and helping to get Moser's mobile phone when a crime has been committed. One famous episode features Moser using Rex to resolve a hostage situation by telling him to creep up behind the criminal and "frighten him" (following Rex's earlier success at frightening Stockinger by jumping on him from behind). There is also a considerable element of humour in Rex's activities. He constantly annoys Stockinger by pulling on his coat and stealing his ham rolls. Later, Höllerer keeps a running score of Böck's success against Rex - not a flattering result for the officer. While not chasing criminals, he often plays pranks on the officers or fails to obey orders to help with the housework. Rex is very fond of horses and once fastened a rope to Alex's car so he could take the horse home. Another time Rex attacked a man who was beating a horse and, later in the same episode, he ran into a burning barn to rescue a horse. With Moser, Rex reacts particularly badly to words like "frau" (woman) and, later, "tierarzt" (vet), as he disapproves of his master's attention to women. During a scene in which Koch claims that Moser "doesn't understand women at all now", Moser tells Koch, "Don't say that word. Every time you say 'woman' he [Rex] runs off with my laundry". Koch asks him what Rex does with it, to which Moser replies, "He washes it". Rex was not jealous of Alex and stole a rose for Alex to give to a pretty blonde co-worker. Once when Moser is working undercover and needs to ensure Rex won't greet him. He tells Stockinger, "You only need to say'vet' to him and he'll stop whatever he's doing", a statement which results in a memorable scene involving Stockinger walking after Rex at a crime scene calling out "Vet! Vet!" Rex has an uncanny penchant for ham rolls, or "Wurštsemm'ln" in the local dialect. He is introduced to them by Moser, who tells him, "I practically live on these". Rex has to date been played by four dogs. Until 2000, he was played by Santo vom Haus Zieglmayer, also known as 'Beejay', and was then replaced by Rhett Butler. For the 2008 revival, Rex is played by a dog named Henry. Between 2012/13, Rex is played by Nicky. The first "team leader", Richard "Richie" Moser is a hard-bitten cop who, as the first season begins, is going through a bitter divorce from his wife Gina, who takes all their furniture. Moser is also attempting to quit smoking, to improve his blood circulation. An ex-truck driver, Moser credits Max Koch with keeping him from a life of crime, at one point telling Koch that "I'd be on the wrong side of the law too, just like him", referring to a young pickpocket he has just chased through central Vienna. Moser befriended Rex whose former police trainer, Michael, was shot and killed by an escaping suspect. To save the dog from being put down, Moser "adopted" him without ever completing any of the official paperwork. He famously declares at one point, "My taxes pay for this dog, so why can't I give him a better home?". Moser, in contrast to his successors, is shown to be quite athletic, often performing acrobatic stunts while chasing suspects. Moretti's looks were also exploited by the producers of the show. He made several nude appearances, including an episode where Moser and a female colleague frolick naked in the woods to attract a serial killer targeting young couples. As Moser's personal life improves, his sense of humour returns. This is noticeable in the general lightening in the tone of the show from the initial episodes ("Diagnosis Murder" being a prime example) to ones with more light-hearted banter among the officers. Being a bachelor, Moser flirts with many of the attractive women featured in the storylines. Moser begins a relationship with Sonja, his local vet, which Rex thoroughly disapproves of and constantly tries to sabotage. In time, Rex accepts Sonja and even pretends to have an injured paw when he wants her to stay with him. Sonja eventually leaves Moser and Rex when she is offered a job in America. In the final scenes of the season 4 episode "Moser's Death", Moser is killed in the line of duty by an escaped 'border-line psychopath' played by famous German actor Ulrich Tukur ("Das Leben der Anderen") while Moser is rescuing his lover, Patricia Neuhold (a psychologist who has been helping with the case). The escapee commits suicide just after he kills Moser, and there is a heartbreaking scene at the hospital after the doctor tells Moser's friends that he died. Rex takes a squeaky toy that Moser bought at the beginning of the episode to Moser's body and squeaks it until he accepts his master is gone, then he lays his head on Moser's chest and the scene fades to white. Alex Brandtner replaces Moser as team leader. Following Moser's death, Rex has become depressed and refuses to eat, wanting to stay near Moser's house all the time. However, Brandtner succeeds in helping Rex out of his depression. Brandtner had lost his former dog, Arko, in an explosion and does not want to work with dogs again, until he meets Rex. The explosion has also robbed him of his hearing in his right ear, a fact he confides only to Rex. Brandtner moves into the house that Moser and Rex used to share, apparently because Rex does not want to leave. Brandtner is athletic and performs various physical stunts throughout the series, such as diving over car bonnets, engaging in fast-paced chases on foot and dives. His living room is filled with boxing and fitness gear and he is portrayed as very attractive to women. He had once gone undercover in a prison and also as a drunken homeless man, for instance. On his first appearance in the show, he dives into the Danube Canal to retrieve a vital piece of evidence, and later in his debut episode he parachutes from a light aircraft, along with Rex, in order to apprehend a suspect. He also seems to have an uncanny instinct for sensing if a suspect is guilty or innocent, even without evidence. During the time Burkhard was on the show, the international ratings for the series increased. Unlike Moretti, Burkhard's looks were not exploited by the producers of the show and he did not make nude appearances. The most skin that Burkhard showed was in an episode where a bank burglar forced Brandtner to strip to prove that he was unarmed, before parading him through the street in only his underwear. Replacing Brandtner as team leader, Hoffmann is a very eager detective. Hoffmann is portrayed as being very witty, outsmarting murderers. He is also portrayed as being stouter, yet more muscular in comparison to Brandtner and Moser; in one instance he is shown doing various workouts. He shares a close relationship with Niki Herzog, and they soon live together, but sometimes have disagreements. Apparently Hoffmann had studied forensic science under Graf, and the two men still seem to share a somewhat master-student relationship, with Hoffmann often deferring to Graf's judgement (where Brandtner and Moser had previously not always done so). In season 11, Rex moves to Rome, where he meets his new partner, Italian homicide detective Chief Inspector Lorenzo Fabbri. Rex seems to understand the Italian language quite easily. In the second episode of season 14 (entitled "Amidst the Wolves") Fabbri dies in the explosion of a car during a trap prepared by a Mafia boss. Davide Rivera replaces Fabbri as team leader in season 14. Rivera becomes a friend with Rex after the loss of Inspector Lorenzo Fabbri. He follows his grandfather's advice and, eventually, Rex stops avoiding him. Rivera appears for the last time on the episode "Legami di sangue", the last episode of season 15. It is unknown why he does not appear in season 16. Marco Terzani replaces Rivera as team leader in season 16. The "straight man" to Rex—and, increasingly, Moser—Ernst Stockinger ("Stocki" for short) is a character who becomes much more likeable as his part in the series develops. Stockinger is thin and always has a very serious demeanour. In later episodes, this is revealed as a cover for his schemes to outsmart Rex, who loves to tease him. Although Stockinger pretends not to like dogs, he risks his career to help Moser save Rex when the dog is kidnapped to prevent Moser from testifying against an assassin. For all Stockinger's constantly-voiced irritation with Rex, he genuinely has come to care for this particular dog. This is very obvious in the last two episodes Stocki appears in, when he is upset that Rex jumped from one roof to another to capture a killer. Stocki is also openly affectionate to Rex once his transfer is approved and he realizes how much he is going to miss the team. He tells Richard and Höllerer they are his only friends and includes Rex as his friend as well. Stockinger is married and uses his marriage to jokingly claim expertise over Moser in regard to women. Frequently, when a case hinges on the behaviour of a female witness or suspect, Stockinger gently tells Moser, "Richard, since your divorce, you've lost your touch with women". Stockinger's wife, it seems, is not greatly pleased with her husband's choice of career at times, and Moser often reminds him of this. Stocki's knowledge of women does not save him and Rex from being thrown out by Stocki's wife when he watches Rex and the dog howls for Moser. Another of Stockinger's idiosyncrasies is his constant references to surgery which has been performed on him - most likely for stomach ulcers. He seems to delight in telling stories about this surgery at the most inappropriate moments, such as when the others are about to eat. Eventually, Stockinger is transferred to Salzburg and leaves the series. In this final episode, Rex saves Stockinger by leaping across a classroom just as a disgruntled divorced man was about to stab Stockinger in the throat during an attempted kidnapping attempt on his child. Moser, in a farewell speech, jokingly tells Stocki that, "You have been a bad cop, a bad man, and not at all a good friend". Stockinger later features in a spin-off two season television series, "Stockinger", featuring him at his new police department. He is replaced by Christian Böck. The obese Peter Höllerer is a constant source of comic relief in the series. Generally found ensconced behind his desk working the phones, his face visibly falls whenever Moser and Stockinger (or, later, Brandtner and Böck) require him to do fieldwork. That said, he is capable of surprising speed when running and can also demonstrate driving skills on a par with other officers. In one episode, Höllerer is taken hostage by a man with a bomb who forces him to drive away from a police blockade. Höllerer turns the tables by driving at high speed into an empty parking lot and diving out of the car. In another episode, Höllerer disarmed a bomb just before it would have exploded. Höllerer tends to take a co-ordinating role when an operation is being planned, rather than actually going undercover or making the arrest himself. In these situations, he reveals himself to have a very clear head and to be capable of coping with even the most unusual situations that his partners get involved into. Höllerer has a soft spot for Rex as the series progresses, after first voicing concern that Moser did not adopt him through the proper channels. This is shown by his keeping score between Böck and Rex in the early episodes featuring the former. Höllerer takes inordinate delight in seeing the dog outsmarting the man. Höllerer's departure from the series is brought about by his retirement to care for his ailing mother, a woman about whom he often speaks. He is replaced by Fritz Kunz. Of all the recurring characters in the series, Höllerer's accent is the thickest. Viewers familiar with standard German will often have difficulty understanding his Viennese dialect. Böck is first introduced as a somewhat suspicious-looking character, a member of a borderline-illegal car club who is not even trusted by his club mates. During the course of his investigation into this club, Moser begins to suspect Böck, but he turns out to be an undercover policeman making similar investigations.The two eventually combine to solve the relevant case, and Moser convinces Böck to transfer to his team. Böck's undercover skills are largely ignored after the transfer, but his personable manner proves an advantage when it comes to interrogations (particularly contrasting with the somewhat dour Moser). By the time of Brandtner's arrival, Böck's youth and athleticism have resulted in his frequently being involved in chasing criminals on foot. The dynamic between Böck and Kunz forms an almost constant source of comic relief. Most notable in this is their dialogue when trying to establish the angle from which a witness would have seen a certain event - each man speaks at cross-purposes to the other and both end up totally confused. Böck and Rex share a rivalry, with Böck trying to outsmart Rex, but Rex wins nearly all the time. Böck is also one of the few who question Rex's abilities as an elite police dog, but Moser keeps telling him that he has always been this way. Replacing Höllerer after the latter's retirement to care for his mother, Kunz has been drawn from the statistics section of the force. Initially he is very much out of place in the slightly freer atmosphere of Brandtner's office. A running gag in his early appearances deals with his obsessive-compulsiveness and fussy attention to the placement of his desk stationery (e.g., pencils arranged from tallest to shortest and paper clips aligned) only to have Rex or one of the others move everything around. Kunz's background in statistics is also often the source of amusement, as he is seemingly able to deliver, from memory, obscure statistical information about the activities of criminals. He tends to be used to man the phones during investigations, rather than on active duty. However, he is also occasionally required to go undercover (once as a kitchen hand, another time as a stable hand and another as an entertainer in a street market), much to his chagrin. Kunz is much tougher than he looks. He once smashed a door in with an ax just in time to save Alex's life after a murder suspect left Alex facedown and unconscious in a filling bathtub. The only female officer played by Elke Winkens in the history of the show, Herzog is paired with Hoffmann (Kunz is almost entirely desk-bound in this incarnation of the series), and sexual tension constantly results. The pair spend the night together, before starting their new jobs, without realising that they are both police officers. They soon share a house (with Rex) and are often disturbed in the middle of a romantic moment with news of a case. In contrast to Hoffmann, Herzog tends to be more level-headed and capable of performing physical acts. Her physical appearance also serves the team well in relating to suspects, as she is frequently underestimated and sometimes taunted by brash male criminals. Morini is a colleague of Lorenzo Fabbri and they work on every crime together. Rex does not obey Morini at all, however in one episode he takes care of Rex because Fabbri has broken his ankle. At the beginning of the 14th season he is transferred to Milan and leaves the series. Alberto Monterosso replaces Morini. Dr Leo Graf is the forensic pathologist consulted by the detectives. On occasion, he is found at the crime scene itself, however he is normally to be found in his pathology laboratory, and occasionally comes into the police office. Gerhard Zemann is the only actor to appear as the same character throughout the long-running series. Dr Graf is a sometimes prickly personality, but underneath this exterior he has a very dry wit - frequently regaling the detectives against their will with the gruesome details of a murder. Naturally he is quite comfortable in his lab, surrounded by dead bodies, even if others are not. Many of the earlier episodes highlight the contrasting reactions of the policemen (especially Moser and Stockinger) and Graf to the death all around them. At times, however, Dr Graf clearly resents the pressure put on him by the policemen. One memorable telephone exchange involves Moser agreeing to pay Dr Graf a number of Cuban cigars for working on the weekend. Another time, Graf's car is towed while he is investigating a murder scene. The resulting invective he uses towards the authorities responsible is caustic. Where Graf is very amiable towards Moser's team, this relationship progressively changes as Brandtner arrives. Early episodes featuring Brandtner show Alex and Leo using formal language - generally involving the German "Sie" form of address (the polite form). Eventually, this exterior is broken down and the new team is invited to call him Leo - a sign of considerable familiarity in German or Austrian society. Accordingly, Brandtner's greeting to Graf alters from the formal "Guten Morgen" to the more familiar "Servus". With Hoffmann and Herzog, however, the relationship with Graf is more of a teacher-student one. It emerges early that Hoffmann had been taught forensic techniques by Graf, and it is clear that some of the awe felt by the considerably younger policeman for his mentor is still present. Graf also assumes a much more advisory role with this team, appearing only once during each investigation instead of being constantly on call. By the time Rex moves to Rome with Lorenzo Fabbri of the Italian police, Dr Graf still serves as Vienna's main forensic officer as seen in a Rex special as Rex and Fabbri return to Vienna to investigate a case there. Familiarly known to all as Max, Koch is a retired policeman who saved Moser from a life of crime and became something of a mentor to him. Many early episodes feature Moser asking Koch for advice - often in a café or a pool hall. It is, in fact, advice from Koch which is responsible for solving many of the more baffling cases, as his insights into human psychology - particularly female psychology (something he often claims Moser has had no knowledge of since his divorce) - prove correct. As the series progresses, Koch's role alters to that of being a useful spy for Moser in certain situations where his team is too well-known. It is Koch's visit to a restaurant which provides the breakthrough in one case. In another he stumbles upon the solution to a particularly brutal homicide while sitting in a park with Rex. Koch is increasingly reluctant to help Moser with his work, although he is always told that this will be the last time. As Stockinger points out, it always "is" the last time... until the next request. Moser also tries to appeal to Koch's sense of adventure which, as Max famously explains, is satisfied by eating goulash and not knowing if he will suffer from "Rinderwahnsinn" (mad cow disease). Following Stockinger's transfer to Salzburg, Koch assists the team to reorganise the office. His snide remarks about Stockinger's files result in Höllerer telling him to read through them all (to which Koch responds that he's doing more work since he retired than he did when he worked). He also spreads out his pipe collection on Stocki's old desk and declares that he will "open a pipe shop" while the team attempts to find a replacement for Stocki. Max is no longer seen or spoken of after Moser's death. Katia Martelli is the forensics officer in Rome. She is seen as a romantic interest for Fabbri, but Rex is opposed to this. She is always looking for an opportunity to ensnare him. At one point, when Fabbri is injured and is at home researching a murder related to role playing games on his computer, he asks for a gaming police officer to be sent to his house to brief him about computer game culture. Martelli takes this opportunity to enter his house and seduce him, and creates an RPG profile for him so he can befriend the suspects online—the figure she chooses for him is a model of Fabbri wearing only a towel. Morini constantly goads Martelli and Fabbri into coupling. After one case is solved, Fabbri takes her home to wine and dine her, much to Rex's chagrin. At the start of the next episode, they drunkenly awake in Fabbri's bed. Filippo Gori is Fabbri's boss who hates Rex when they first meet, and vows to eject him for being unauthorised. Eventually, he accepts that Rex can solve crimes and lets him stay; this came after Rex and Fabbri had brought down a prostitution and sex slave racket run by some illegal Chinese immigrants—Fabbri leaked the story to a journalist friend so that Rex was photographed on the front page of a newspaper. In the episode "A Man Alone" his partner is murdered. Although all limited evidence points to Gori, Fabbri proves that he is not the culprit. Filippo is Morini's fish. Morini got a fish because he was jealous of Lorenzo. Morini does not realize that he has named his fish after his boss, so when Gori comes in he says his fish is called Filiberto. "Kommissar Rex" has been shown in the following countries: In Italy, the first 6 seasons were released on DVD, with only the Italian dub. The first two seasons were also released in Germany, again only with German audio. In Australia, Region 4 English-subtitled DVDs of "Inspector Rex" are currently available for the first sixteen seasons (labeled as fourteen in Australia; see "Australian numbering"). The Italian seasons of the show were released under the special title "Rex in Rome". On 10 October 2007, a special DVD, "Rex By Request" was released featuring the five favourite "Kommissar Rex" episodes as voted by fans. Also included is an interview with producer/writer Peter Hajek and an hour-long dog-training segment featuring Rex and his trainer Teresa Ann Miller. Australian Releases:
Inspector Rex (German: Kommissar Rex; Italian: Il commissario Rex) is an Austrian-Italian police procedural comedy-drama television series created by Peter Hajek and Peter Moser. Originally an Austrian series aired from 1994 to 2004 on ORF 1, in 2008 it was revived under Austro-Italian production on Rai 1 and, from the next year, was made fully in Italy, with occasional episodes set in Austria. Rai 1 eventually cancelled the Austro-Italian production in June 2015, after eight Italian seasons.
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summarize: The boundary between Asia and Africa is the Red Sea, the Gulf of Suez, and The threefold division of the Old World into Europe, Asia and Africa has been in use since the 6th century BC, due to Greek geographers such as Anaximander and Hecataeus. Anaximander placed the boundary between Asia and Europe along the Phasis River (the modern Rioni river) in Georgia of Caucasus (from its mouth by Poti on the Black Sea coast, through the Surami Pass and along the Kura River to the Caspian Sea), a convention still followed by Herodotus in the 5th century BC. During the Hellenistic period, this convention was revised, and the boundary between Europe and Asia was now considered to be the Tanais (the modern Don River). This is the convention used by Roman era authors such as Posidonius, Strabo and Ptolemy. The border between Asia and Europe was historically defined by European academics. The Don River became The border between Asia and the region of Oceania is usually placed somewhere in the Malay Archipelago. The Maluku Islands in Indonesia are often considered to lie on the border of southeast Asia, with New Guinea, to the east of the islands, being wholly part of Geographical Asia is a cultural artifact of European conceptions of the world, beginning with the Ancient Greeks, being imposed onto other cultures, an imprecise concept causing endemic contention about what it means. Asia does not exactly correspond to the cultural borders of its various types of constituents. From the time of Herodotus a minority of geographers have rejected the three-continent system (Europe, Africa, Asia) on the grounds that there is no substantial physical separation between The idea of a place called "Asia" was originally a concept of Greek civilization, though this might not correspond to the entire continent currently known by that name. The English word comes from Latin literature, where it has the same form, "Asia". Whether "Asia" in other languages comes from Latin of the Roman Empire is much less certain, and the ultimate source of the Latin word is uncertain, though several theories have been published. One of the first classical writers to use Asia as a name of the whole continent was Pliny. This metonymical change in meaning is common and can be observed in some other geographical names, such as Scandinavia (from Scania). Before Greek poetry, the Aegean Sea area was in a Greek Dark Age, at the beginning of which syllabic writing was lost and alphabetic writing had not begun. Prior to then in the Bronze Age the records of the Assyrian Empire, the Hittite Empire and the various Mycenaean states of Greece mention a region undoubtedly Asia, certainly in Anatolia, including if not identical to Lydia. These records are administrative and do not include poetry. The Mycenaean states were destroyed about 1200 BCE by Latin Asia and Greek Ἀσία appear to be the same word. Roman authors translated Ἀσία as Asia. The Romans named a province Asia, located in western Anatolia (in modern-day Turkey). There was an Asia Minor and an Asia Major located in modern-day Iraq. As the earliest evidence of the name is Greek, it is likely circumstantially that Asia came from Ἀσία, but ancient transitions, due to the lack of literary contexts, are difficult to catch in the act. The most likely vehicles were the ancient geographers and historians, such as Herodotus, who were all Greek. Ancient Greek certainly evidences early and rich uses of the name. The first continental use of Asia is attributed to Herodotus (about 440 BCE), not because he innovated it, but because his "Histories" are the earliest surviving prose to describe it in any detail. He defines it carefully, mentioning the previous geographers whom he had read, but whose works are now missing. By it he means The history of Asia can be seen as the distinct histories of several peripheral coastal regions: East Asia, South Asia, Southeast Asia and the Middle East, linked by the interior mass of the Central Asian steppes. The coastal periphery was home to some of the world's earliest known civilizations, each of them developing around fertile river valleys. The civilizations in Mesopotamia, the Indus Valley and the Yellow River shared many similarities. These civilizations may well have exchanged technologies and ideas such as mathematics and the wheel. Other innovations, such as writing, seem to have been developed individually in each area. Cities, states and empires developed in these lowlands. The central steppe region had long been inhabited by horse-mounted nomads who could reach all areas of Asia from the steppes. The earliest postulated expansion out of the steppe is that of the Indo-Europeans, who spread their languages into the Middle East, South Asia, and the borders of China, where the Tocharians resided. The northernmost part of Asia, including much of Siberia, was largely inaccessible to the steppe nomads, owing to the dense forests, climate and tundra. These areas remained very sparsely populated. The center and the peripheries were mostly kept separated by mountains and deserts. The Caucasus and Himalaya mountains Asia is the largest continent on Earth. It covers 9% of the Earth's total surface area (or 30% of its land area), and has the longest coastline, at. Asia is generally defined as comprising the eastern four-fifths of Eurasia. It is located to the east of the Suez Canal and the Ural Mountains, and south of the Caucasus Mountains (or the Kuma–Manych Depression) and the Caspian and Black Seas. It is bounded on the east by the Pacific Ocean, on the south by the Indian Ocean and on the north by the Arctic Ocean. Asia is subdivided into 49 countries, Five of them (Georgia, Azerbaijan, Russia, Kazakhstan and Turkey) are transcontinental countries and having part of their land in Europe. Asia has extremely diverse climates and geographic features. Climates range from arctic and subarctic in Siberia to tropical in southern India and Southeast Asia. It is moist across southeast sections, and dry across much of the interior. Some of the largest daily temperature ranges on Earth occur in western sections of Asia. The monsoon circulation dominates across southern and eastern sections, due to the presence of the Himalayas forcing the formation of a thermal low which draws in moisture during the summer. Southwestern sections of the continent are hot. Siberia is one of the coldest places in the Northern Hemisphere, and can act as a source of arctic air masses for North America. The most active place on Earth for tropical cyclone activity lies northeast of the Philippines and south of Japan. The Gobi Desert is in Mongolia and the Arabian Desert stretches across much of the Middle East. The Yangtze River in China is the longest river in the continent. The Himalayas between Nepal and China is the tallest mountain range in the world. Tropical rainforests stretch across much of southern Asia and coniferous and deciduous forests lie farther north. There are various approaches to the regional division of Asia. The following subdivision into regions is used, among others, by the UN A survey carried out in 2010 by global risk analysis farm Maplecroft identified 16 countries that are extremely vulnerable to climate change. Each nation's vulnerability was calculated using 42 socio, economic and environmental indicators, which identified the likely climate change impacts during the next 30 years. The Asian countries of Bangladesh, India, Vietnam, Thailand, Pakistan and Sri Lanka were among the 16 countries facing extreme risk from climate change. Some shifts are Asia has the largest continental economy by both GDP Nominal and PPP in the world, and is the fastest growing economic region., the largest economies in Asia are China, Japan, India, South Korea, Indonesia and Turkey based on GDP in both nominal and PPP. Based on Global Office Locations 2011, Asia dominated the office locations with 4 of the top 5 being in Asia: Hong Kong, Singapore, Tokyo and Seoul. Around 68 percent of international firms have office in Hong Kong. In the late 1990s and early 2000s, the economies of China and India have been growing rapidly, both with an average annual growth rate of more than 8%. Other recent very-high-growth nations in Asia include Israel, Malaysia, Indonesia, Bangladesh, Thailand, Vietnam, and the Philippines, and mineral-rich nations such as Kazakhstan, Turkmenistan, Iran, Brunei, the United Arab Emirates, Qatar, Kuwait, Saudi Arabia, Bahrain and Oman. According to economic historian Angus Maddison in his book "The World Economy: A Millennial Perspective", India had the world's largest economy during 0 BCE and 1000 BCE. China was the largest and most advanced economy on earth for much of recorded history. For several decades in the late twentieth century Japan was the largest economy in Asia and second-largest of any single nation in the world, after surpassing the Soviet Union (measured in net material product) in 1986 and Germany in 1968. (NB: A number of supernational economies are larger, such as the European Union (EU), the North American Free Trade Agreement (NAFTA) or APEC). This ended in 2010 when China overtook Japan to become the world's second largest economy. In the late 1980s and early 1990s, Japan's GDP was almost as large (current exchange rate method) as that of the rest of Asia combined. In 1995, With growing Regional Tourism with domination of Chinese visitors, MasterCard has released Global Destination Cities Index 2013 with 10 of East Asia had by far the strongest overall Human Development Index (HDI) improvement of any region in the world, nearly doubling average HDI attainment over the past 40 years, according to the report's analysis of health, education and income data. China, the second highest achiever in the world in terms of HDI improvement since 1970, is the only country on the "Top 10 Movers" list due to income rather than health or education achievements. Its per capita income increased a stunning 21-fold over the last four decades, also lifting hundreds of millions out of income poverty. Yet it was not among the region's top performers in improving school enrollment and life expectancy. <br>Nepal, a South Asian country, emerges as one of the world's fastest movers since 1970 mainly due to health and education achievements. Its present life expectancy is 25 years longer than in the 1970s. More than four of every five children of school age in Nepal now attend primary school, compared to just one in five 40 years ago. <br> Hong Kong ranked highest among the countries grouped on the HDI (number 7 in the world, which is in the "very high human development" category), followed by Singapore (9), Japan (19) and South Korea (22). Afghanistan (155) ranked lowest amongst Asian countries out of the 169 countries assessed. Asia is home to several language families and many language isolates. Most Asian countries have more than one language that is natively spoken. For Many of the world's major religions have their origins in Asia, including the five most practiced in the world (excluding irreligion), which are Christianity, Islam, Hinduism, Chinese folk religion (classified as Confucianism and Taoism), and Buddhism respectively. Asian mythology is complex and diverse. The story of the Great Flood for example, as presented to Jews in the Hebrew Bible in the narrative of Noah—and later to Christians in the Old Testament, and to Muslims in the Quran—is earliest found in Mesopotamian mythology, in the Enûma Eliš and "Epic of Gilgamesh". Hindu mythology similarly tells about an avatar of Vishnu in the form of a fish who warned Manu of a terrible flood. Ancient Chinese mythology also tells of a Great Flood spanning generations, one that required the combined efforts of emperors and divinities to control. The Abrahamic religions including Judaism, Christianity, Islam and Bahá'í Faith originated in West Asia. Judaism, the oldest of the Abrahamic faiths, is practiced primarily in Israel, the indigenous homeland and historical birthplace of the Hebrew nation: which today consists both of those Jews who remained in the Middle East and those who returned from diaspora in Europe, North America, and other regions; though various diaspora communities persist worldwide. Jews are the predominant ethnic group in Israel (75.6%) numbering at about 6.1 million, although the levels of adherence to Jewish religion vary. Outside of Israel there are small ancient Jewish communities in Turkey (17,400), Azerbaijan (9,100), Iran (8,756), India (5,000) and Uzbekistan (4,000), among many other places. In total, there are 14.4–17.5 million (2016, est.) Jews alive in the world today, making them one of the smallest Asian minorities, at roughly 0.3 to 0.4 percent of the total population of the continent. Christianity is a widespread religion in Asia with more than 286 million adherents according to Pew Research Center in 2010, and nearly 364 million according to Britannica Book of Almost all Asian religions have philosophical character and Asian philosophical traditions cover a large spectrum of philosophical thoughts and writings. Indian philosophy includes Hindu philosophy and Buddhist philosophy. They include elements of nonmaterial pursuits, whereas another school of thought from India, Cārvāka, preached the enjoyment of the material world. The religions of Hinduism, Buddhism, Jainism and Sikhism originated in India, South Asia. In East Asia, particularly in China and Japan, Confucianism, Taoism and Zen Buddhism took shape. , Hinduism has around 1.1 billion adherents. The faith represents around 25% of Asia's population and is the largest religion in Asia. However, it is mostly concentrated in South Asia. Over 80% of the populations of both India and Nepal adhere to Hinduism, alongside significant communities in Bangladesh, Pakistan, Bhutan, Sri Lanka and Bali, Indonesia. Many overseas Indians in countries such as Burma, Singapore and Some of the events pivotal in the Asia territory The polymath Rabindranath Tagore, a Bengali poet, dramatist, and writer from Santiniketan, now in West Bengal, India, became in 1913 the first Asian Nobel laureate. He won his Nobel Prize in Literature for notable impact his prose works and poetic thought had on English, French, and other national literatures of Europe and the Americas. He is also the writer of the national anthems of Bangladesh and India. Other Asian writers who won Nobel Prize for literature include Yasunari Kawabata (Japan, 1968), Kenzaburō Ōe (Japan, 1994), Gao Xingjian (China, 2000), Orhan Pamuk (Turkey, 2006), and Mo Yan (China, 2012). Some may consider the American writer, Pearl S. Buck, an honorary Asian Nobel Within the above-mentioned states are several partially recognized countries References to articles: Special topics: Lists: Projects
Asia () is Earth's largest and most populous continent, located primarily in the Eastern and Northern Hemispheres. It shares the continental landmass of Eurasia with the continent of Europe and the continental landmass of Afro-Eurasia with both Europe and Africa. Asia covers an area of, about 30% of Earth's total land area and 8.7% of the Earth's total surface area. The continent, which has long been home to the majority of the human population, was the site of many of the first civilizations. Asia is notable for not only its overall large size and population, but also dense and large settlements, as well as vast barely populated regions. Its 4.5 billion people () constitute roughly 60% of the world's population.
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summarize: Joseph Bramah patented the hydraulic press in 1795. While working at Bramah's shop, Henry Maudslay suggested a cup leather packing. Because it produced superior results, the hydraulic press eventually displaced the steam hammer for metal forging. To supply large scale power that was impractical for individual steam engines, central station hydraulic systems were developed. Hydraulic power was used to operate cranes and other machinery in British ports and elsewhere in Europe. The largest hydraulic system was in London. Hydraulic power was used extensively in Bessemer steel production. Hydraulic power was also used for elevators, to operate canal locks and rotating sections of bridges. Some of these systems remained in use well into the twentieth century. Harry Franklin Vickers was called the "Father of Industrial Hydraulics" by ASME. A fundamental feature of hydraulic systems is the ability to apply force or torque multiplication in an easy way, independent of the distance between the input and output, without the need for mechanical gears or levers, either by altering the effective areas in two connected cylinders or the effective displacement (cc/rev) between a pump and motor. In normal cases, hydraulic ratios are combined with a mechanical force or torque ratio for optimum machine designs such as boom movements and trackdrives for an excavator. Cylinder C1 is one inch in radius, and cylinder C2 is ten inches in radius. If the force exerted on C1 is 10 lbf, the force exerted by C2 is 1000 lbf because C2 is a hundred times larger in area ("S" = π"r"2) as C1. The downside to this is that you have to move C1 a hundred inches to move C2 one inch. The most common use for this is the classical hydraulic jack where a pumping cylinder with a small diameter is connected to the lifting cylinder with a large diameter. If a hydraulic rotary pump with the displacement 10 cc/rev is connected to a hydraulic rotary motor with 100 cc/rev, the shaft torque required to drive the pump is one tenth of the torque then available at the motor shaft, but the shaft speed (rev/min) for the motor is also only one tenth of the pump shaft speed. This combination is actually the same type of force multiplication as the cylinder example, just that the linear force in this case is a rotary force, defined as torque. Both these examples are usually referred to as a hydraulic transmission or hydrostatic transmission involving a certain hydraulic "gear ratio". A hydraulic circuit is a system comprising an interconnected set of discrete components that transport liquid. The purpose of this system may be to control where fluid flows (as in a network of tubes of coolant in a thermodynamic system) or to control fluid pressure (as in hydraulic amplifiers). For example, hydraulic machinery uses hydraulic circuits (in which hydraulic fluid is pushed, under pressure, through hydraulic pumps, pipes, tubes, hoses, hydraulic motors, hydraulic cylinders, and so on) to move heavy loads. The approach of describing a fluid system in terms of discrete components is inspired by the success of electrical circuit theory. Just as electric circuit theory works when elements are discrete and linear, hydraulic circuit theory works best when the elements (passive component such as pipes or transmission lines or active components such as power packs or pumps) are discrete and linear. This usually means that hydraulic circuit analysis works best for long, thin tubes with discrete pumps, as found in chemical process flow systems or microscale devices. The circuit comprises the following components: For the hydraulic fluid to do work, it must flow to the actuator and/or motors, then return to a reservoir. The fluid is then filtered and re-pumped. The path taken by hydraulic fluid is called a hydraulic circuit of which there are several types. Open-loop: Pump-inlet and motor-return (via the directional valve) are connected to the hydraulic tank. The term loop applies to feedback; the more correct term is open versus closed "circuit". Open center circuits use pumps which supply a continuous flow. The flow is returned to the tank through the control valve's open center; that is, when the control valve is centered, it provides an open return path to the tank and the fluid is not pumped to a high pressure. Otherwise, if the control valve is actuated it routes fluid to and from an actuator and tank. The fluid's pressure will rise to meet any resistance, since the pump has a constant output. If the pressure rises too high, fluid returns to the tank through a pressure relief valve. Multiple control valves may be stacked in series. This type of circuit can use inexpensive, constant displacement pumps. Closed-loop: Motor-return is connected directly to the pump-inlet. To keep up pressure on the low pressure side, the circuits have a charge pump (a small gearpump) that supplies cooled and filtered oil to the low pressure side. Closed-loop circuits are generally used for hydrostatic transmissions in mobile applications. "Advantages:" No directional valve and better response, the circuit can work with higher pressure. The pump swivel angle covers both positive and negative flow direction. "Disadvantages:" The pump cannot be utilized for any other hydraulic function in an easy way and cooling can be a problem due to limited exchange of oil flow. High power closed loop systems generally must have a 'flush-valve' assembled in the circuit in order to exchange much more flow than the basic leakage flow from the pump and the motor, for increased cooling and filtering. The flush valve is normally integrated in the motor housing to get a cooling effect for the oil that is rotating in the motor housing itself. The losses in the motor housing from rotating effects and losses in the ball bearings can be considerable as motor speeds will reach 4000-5000 rev/min or even more at maximum vehicle speed. The leakage flow as well as the extra flush flow must be supplied by the charge pump. A large charge pump is thus very important if the transmission is designed for high pressures and high motor speeds. High oil temperature is usually a major problem when using hydrostatic transmissions at high vehicle speeds for longer periods, for instance when transporting the machine from one work place to the other. High oil temperatures for long periods will drastically reduce the lifetime of the transmission. To keep down the oil temperature, the system pressure during transport must be lowered, meaning that the minimum displacement for the motor must be limited to a reasonable value. Circuit pressure during transport around 200-250 bar is recommended. Closed loop systems in mobile equipment are generally used for the transmission as an alternative to mechanical and hydrodynamic (converter) transmissions. The advantage is a stepless gear ratio (continuously variable speed/torque) and a more flexible control of the gear ratio depending on the load and operating conditions. The hydrostatic transmission is generally limited to around 200 kW maximum power, as the total cost gets too high at higher power compared to a hydrodynamic transmission. Large wheel loaders for instance and heavy machines are therefore usually equipped with converter transmissions. Recent technical achievements for the converter transmissions have improved the efficiency and developments in the software have also improved the characteristics, for example selectable gear shifting programs during operation and more gear steps, giving them characteristics close to the hydrostatic transmission. Hydrostatic transmissions for earth moving machines, such as for track loaders, are often equipped with a separate 'inch pedal' that is used to temporarily increase the diesel engine rpm while reducing the vehicle speed in order to increase the available hydraulic power output for the working hydraulics at low speeds and increase the tractive effort. The function is similar to stalling a converter gearbox at high engine rpm. The inch function affects the preset characteristics for the 'hydrostatic' gear ratio versus diesel engine rpm. The closed center circuits exist in two basic configurations, normally related to the regulator for the variable pump that supplies the oil: Load-sensing systems (LS-system) generates less power losses as the pump can reduce both flow and pressure to match the load requirements, but requires more tuning than the CP-system with respect to system stability. The LS-system also requires additional logical valves and compensator valves in the directional valves, thus it is technically more complex and more expensive than the CP-system. The LS-system generates a constant power loss related to the regulating pressure drop for the pump regulator : formula_1 The average formula_2 is around 2 MPa (290 psi). If the pump flow is high the extra loss can be considerable. The power loss also increases if the load pressures vary a lot. The cylinder areas, motor displacements and mechanical torque arms must be designed to match load pressure in order to bring down the power losses. Pump pressure always equals the maximum load pressure when several functions are run simultaneously and the power input to the pump equals the (max. load pressure + Δ"p") x sum of flow. valve flow area for faster response, increased stability and fewer system losses. This is a new type of LS-system, not yet fully developed. Technically the down-stream mounted compensator in a valveblock can physically be mounted "up-stream", but work as a down-stream compensator. System type (3) gives the advantage that activated functions are synchronized independent of pump flow capacity. The flow relation between 2 or more activated functions remains independent of load pressures, even if the pump reaches the maximum swivel angle. This feature is important for machines that often run with the pump at maximum swivel angle and with several activated functions that must be synchronized in speed, such as with excavators. With type (4) system, the functions with "up-stream" compensators have priority. Example: Steering-function for a wheel loader. The system type with down-stream compensators usually have a unique trademark depending on the manufacturer of the valves, for example "LSC" (Linde Hydraulics), "LUDV" (Bosch Rexroth Hydraulics) and "Flowsharing" (Parker Hydraulics) etc. No official standardized name for this type of system has been established but Flowsharing is a common name for it. Hydraulic pumps supply fluid to the components in the system. Pressure in the system develops in reaction to the load. Hence, a pump rated for 5,000 psi is capable of maintaining flow against a load of 5,000 psi. Pumps have a power density about ten times greater than an electric motor (by volume). They are powered by an electric motor or an engine, connected through gears, belts, or a flexible elastomeric coupling to reduce vibration. Common types of hydraulic pumps to hydraulic machinery applications are; Piston pumps are more expensive than gear or vane pumps, but provide longer life operating at higher pressure, with difficult fluids and longer continuous duty cycles. Piston pumps make up one half of a hydrostatic transmission. "Directional control valves" route the fluid to the desired actuator. They usually consist of a spool inside a cast iron or steel housing. The spool slides to different positions in the housing, and intersecting grooves and channels route the fluid based on the spool's position. The spool has a central (neutral) position maintained with springs; in this position the supply fluid is blocked, or returned to tank. Sliding the spool to one side routes the hydraulic fluid to an actuator and provides a return path from the actuator to tank. When the spool is moved to the opposite direction the supply and return paths are switched. When the spool is allowed to return to neutral (center) position the actuator fluid paths are blocked, locking it in position. Directional control valves are usually designed to be stackable, with one valve for each hydraulic cylinder, and one fluid input supplying all the valves in the stack. Tolerances are very tight in order to handle the high pressure and avoid leaking, spools typically have a clearance with the housing of less than a thousandth of an inch (25 μm). The valve block will be mounted to the machine's frame with a "three point" pattern to avoid distorting the valve block and jamming the valve's sensitive components. The spool position may be actuated by mechanical levers, hydraulic "pilot" pressure, or solenoids which push the spool left or right. A seal allows part of the spool to protrude outside the housing, where it is accessible to the actuator. The main valve block is usually a stack of "off the shelf" directional control valves chosen by flow capacity and performance. Some valves are designed to be proportional (flow rate proportional to valve position), while others may be simply on-off. The control valve is one of the most expensive and sensitive parts of a hydraulic circuit. The hydraulic fluid reservoir holds excess hydraulic fluid to accommodate volume changes from: cylinder extension and contraction, temperature driven expansion and contraction, and leaks. The reservoir is also designed to aid in separation of air from the fluid and also work as a heat accumulator to cover losses in the system when peak power is used. Design engineers are always pressured to reduce the size of hydraulic reservoirs, while equipment operators always appreciate larger reservoirs. Reservoirs can also help separate dirt and other particulate from the oil, as the particulate will generally settle to the bottom of the tank. Some designs include dynamic flow channels on the fluid's return path that allow for a smaller reservoir. Accumulators are a common part of hydraulic machinery. Their function is to store energy by using pressurized gas. One type is a tube with a floating piston. On the one side of the piston there is a charge of pressurized gas, and on the other side is the fluid. Bladders are used in other designs. Reservoirs store a system's fluid. Examples of accumulator uses are backup power for steering or brakes, or to act as a shock absorber for the hydraulic circuit., Also known as "tractor fluid", hydraulic fluid is the life of the hydraulic circuit. It is usually petroleum oil with various additives. Some hydraulic machines require fire resistant fluids, depending on their applications. In some factories where food is prepared, either an edible oil or water is used as a working fluid for health and safety reasons. In addition to transferring energy, hydraulic fluid needs to lubricate components, suspend contaminants and metal filings for transport to the filter, and to function well to several hundred degrees Fahrenheit or Celsius. Filters are an important part of hydraulic systems which removes the unwanted particles from fluid. Metal particles are continually produced by mechanical components and need to be removed along with other contaminants. Filters may be positioned in many locations. The filter may be located between the reservoir and the pump intake. Blockage of the filter will cause cavitation and possibly failure of the pump. Sometimes the filter is located between the pump and the control valves. This arrangement is more expensive, since the filter housing is pressurized, but eliminates cavitation problems and protects the control valve from pump failures. The third common filter location is just before the return line enters the reservoir. This location is relatively insensitive to blockage and does not require a pressurized housing, but contaminants that enter the reservoir from external sources are not filtered until passing through the system at least once. Filters are used from 7 micron to 15 micron depends upon the viscosity grade of hydraulic oil. "Hydraulic tubes" are seamless steel precision pipes, specially manufactured for hydraulics. The tubes have standard sizes for different pressure ranges, with standard diameters up to 100 mm. The tubes are supplied by manufacturers in lengths of 6 m, cleaned, oiled and plugged. The tubes are interconnected by different types of flanges (especially for the larger sizes and pressures), welding cones/nipples (with o-ring seal), several types of flare connection and by cut-rings. In larger sizes, hydraulic pipes are used. Direct joining of tubes by welding is not acceptable since the interior cannot be inspected. "Hydraulic pipe" is used in case standard hydraulic tubes are not available. Generally these are used for low pressure. They can be connected by threaded connections, but usually by welds. Because of the larger diameters the pipe can usually be inspected internally after welding. Black pipe is non-galvanized and suitable for welding. "Hydraulic hose" is graded by pressure, temperature, and fluid compatibility. Hoses are used when pipes or tubes can not be used, usually to provide flexibility for machine operation or maintenance. The hose is built up with rubber and steel layers. A rubber interior is surrounded by multiple layers of woven wire and rubber. The exterior is designed for abrasion resistance. The bend radius of hydraulic hose is carefully designed into the machine, since hose failures can be deadly, and violating the hose's minimum bend radius will cause failure. Hydraulic hoses generally have steel fittings swaged on the ends. The weakest part of the high pressure hose is the connection of the hose to the fitting. Another disadvantage of hoses is the shorter life of rubber which requires periodic replacement, usually at five to seven year intervals. Tubes and pipes for hydraulic applications are internally oiled before the system is commissioned. Usually steel piping is painted outside. Where flare and other couplings are used, the paint is removed under the nut, and is a location where corrosion can begin. For this reason, in marine applications most piping is stainless steel. Components of a hydraulic system [sources (e.g. pumps), controls (e.g. valves) and actuators (e.g. cylinders)] need connections that will contain and direct the hydraulic fluid without leaking or losing the pressure that makes them work. In some cases, the components can be made to bolt together with fluid paths built-in. In more cases, though, rigid tubing or flexible hoses are used to direct the flow from one component to the next. Each component has entry and exit points for the fluid involved (called ports) sized according to how much fluid is expected to pass through it. There are a number of standardized methods in use to attach the hose or tube to the component. Some are intended for ease of use and service, others are better for higher system pressures or control of leakage. The most common method, in general, is to provide in each component a female-threaded port, on each hose or tube a female-threaded captive nut, and use a separate adapter fitting with matching male threads to connect the two. This is functional, economical to manufacture, and easy to service. Fittings serve several purposes; A typical piece of machinery or heavy equipment may have thousands of sealed connection points and several different types: Elastomeric seals (O-ring boss and face seal) are the most common types of seals in heavy equipment and are capable of reliably sealing 6000+ psi (40+ MPa) of fluid pressure.
Hydraulic machines use liquid fluid power to perform work. Heavy construction vehicles are a common example. In this type of machine, hydraulic fluid is pumped to various hydraulic motors and hydraulic cylinders throughout the machine and becomes pressurised according to the resistance present. The fluid is controlled directly or automatically by control valves and distributed through hoses, tubes, and/or pipes.
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summarize: Discussion of the concepts of heaviness (weight) and lightness (levity) date back to the ancient Greek philosophers. These were typically viewed as inherent properties of objects. Plato described weight as the natural tendency of objects to seek their kin. To Aristotle, weight and levity represented the tendency to restore the natural order of the basic elements: air, earth, fire and water. He ascribed absolute weight to earth and absolute levity to fire. Archimedes saw weight as a quality opposed to buoyancy, with the conflict between the two determining if an object sinks or floats. The first operational definition of weight was given by Euclid, who defined weight as: "the heaviness or lightness of one thing, compared to another, as measured by a balance." Operational balances (rather than definitions) had, however, been around much longer. According to Aristotle, weight was the direct cause of the falling motion of an object, the speed of the falling object was supposed to be directly proportionate to the weight of the object. As medieval scholars discovered that in practice the speed of a falling object increased with time, this prompted a change to the concept of weight to maintain this cause-effect relationship. Weight was split into a "still weight" or, which remained constant, and the actual gravity or, which changed as the object fell. The concept of was eventually replaced by Jean Buridan's impetus, a precursor to momentum. The rise of the Copernican view of the world led to the resurgence of the Platonic idea that like objects attract but in the context of heavenly bodies. In the 17th century, Galileo made significant advances in the concept of weight. He proposed a way to measure the difference between the weight of a moving object and an object at rest. Ultimately, he concluded weight was proportionate to the amount of matter of an object, not the speed of motion as supposed by the Aristotelean view of physics. The introduction of Newton's laws of motion and the development of Newton's law of universal gravitation led to considerable further development of the concept of weight. Weight became fundamentally separate from mass. Mass was identified as a fundamental property of objects connected to their inertia, while weight became identified with the force of gravity on an object and therefore dependent on the context of the object. In particular, Newton considered weight to be relative to another object causing the gravitational pull, e.g. the weight of the Earth towards the Sun. Newton considered time and space to be absolute. This allowed him to consider concepts as true position and true velocity. Newton also recognized that weight as measured by the action of weighing was affected by environmental factors such as buoyancy. He considered this a false weight induced by imperfect measurement conditions, for which he introduced the term "apparent weight" as compared to the "true weight" defined by gravity. Although Newtonian physics made a clear distinction between weight and mass, the term weight continued to be commonly used when people meant mass. This led the 3rd General Conference on Weights and Measures (CGPM) of 1901 to officially declare "The word "weight" denotes a quantity of the same nature as a "force": the weight of a body is the product of its mass and the acceleration due to gravity", thus distinguishing it from mass for official usage. In the 20th century, the Newtonian concepts of absolute time and space were challenged by relativity. Einstein's equivalence principle put all observers, moving or accelerating, on the same footing. This led to an ambiguity as to what exactly is meant by the force of gravity and weight. A scale in an accelerating elevator cannot be distinguished from a scale in a gravitational field. Gravitational force and weight thereby became essentially frame-dependent quantities. This prompted the abandonment of the concept as superfluous in the fundamental sciences such as physics and chemistry. Nonetheless, the concept remained important in the teaching of physics. The ambiguities introduced by relativity led, starting in the 1960s, to considerable debate in the teaching community as how to define weight for their students, choosing between a nominal definition of weight as the force due to gravity or an operational definition defined by the act of weighing. Several definitions exist for "weight", not all of which are equivalent. The most common definition of weight found in introductory physics textbooks defines weight as the force exerted on a body by gravity. This is often expressed in the formula, where "W" is the weight, "m" the mass of the object, and "g" gravitational acceleration. In 1901, the 3rd General Conference on Weights and Measures (CGPM) established this as their official definition of "weight": This resolution defines weight as a vector, since force is a vector quantity. However, some textbooks also take weight to be a scalar by defining: The gravitational acceleration varies from place to place. Sometimes, it is simply taken to have a standard value of, which gives the standard weight. The force whose magnitude is equal to "mg" newtons is also known as the m kilogram weight (which term is abbreviated to kg-wt) In the operational definition, the weight of an object is the force measured by the operation of weighing it, which is the force it exerts on its support. Since "W" is the downward force on the body by the centre of earth and there is no acceleration in the body, there exists an opposite and equal force by the support on the body. Also it is equal to the force exerted by the body on its support because action and reaction have same numerical value and opposite direction. This can make a considerable difference, depending on the details; for example, an object in free fall exerts little if any force on its support, a situation that is commonly referred to as weightlessness. However, being in free fall does not affect the weight according to the gravitational definition. Therefore, the operational definition is sometimes refined by requiring that the object be at rest. However, this raises the issue of defining "at rest" (usually being at rest with respect to the Earth is implied by using standard gravity). In the operational definition, the weight of an object at rest on the surface of the Earth is lessened by the effect of the centrifugal force from the Earth's rotation. The operational definition, as usually given, does not explicitly exclude the effects of buoyancy, which reduces the measured weight of an object when it is immersed in a fluid such as air or water. As a result, a floating balloon or an object floating in water might be said to have zero weight. In the ISO International standard ISO 80000-4:2006, describing the basic physical quantities and units in mechanics as a part of the International standard ISO/IEC 80000, the definition of "weight" is given as: The definition is dependent on the chosen frame of reference. When the chosen frame is co-moving with the object in question then this definition precisely agrees with the operational definition. If the specified frame is the surface of the Earth, the weight according to the ISO and gravitational definitions differ only by the centrifugal effects due to the rotation of the Earth. In many real world situations the act of weighing may produce a result that differs from the ideal value provided by the definition used. This is usually referred to as the apparent weight of the object. A common example of this is the effect of buoyancy, when an object is immersed in a fluid the displacement of the fluid will cause an upward force on the object, making it appear lighter when weighed on a scale. The apparent weight may be similarly affected by levitation and mechanical suspension. When the gravitational definition of weight is used, the operational weight measured by an accelerating scale is often also referred to as the apparent weight. In modern scientific usage, weight and mass are fundamentally different quantities: mass is an intrinsic property of matter, whereas weight is a "force" that results from the action of gravity on matter: it measures how strongly the force of gravity pulls on that matter. However, in most practical everyday situations the word "weight" is used when, strictly, "mass" is meant. For example, most people would say that an object "weighs one kilogram", even though the kilogram is a unit of mass. The distinction between mass and weight is unimportant for many practical purposes because the strength of gravity does not vary too much on the surface of the Earth. In a uniform gravitational field, the gravitational force exerted on an object (its weight) is directly proportional to its mass. For example, object A weighs 10 times as much as object B, so therefore the mass of object A is 10 times greater than that of object B. This means that an object's mass can be measured indirectly by its weight, and so, for everyday purposes, weighing (using a weighing scale) is an entirely acceptable way of measuring mass. Similarly, a balance measures mass indirectly by comparing the weight of the measured item to that of an object(s) of known mass. Since the measured item and the comparison mass are in virtually the same location, so experiencing the same gravitational field, the effect of varying gravity does not affect the comparison or the resulting measurement. The Earth's gravitational field is not uniform but can vary by as much as 0.5% at different locations on Earth (see Earth's gravity). These variations alter the relationship between weight and mass, and must be taken into account in high-precision weight measurements that are intended to indirectly measure mass. Spring scales, which measure local weight, must be calibrated at the location at which the objects will be used to show this standard weight, to be legal for commerce. This table shows the variation of acceleration due to gravity (and hence the variation of weight) at various locations on the Earth's surface. The historical use of "weight" for "mass" also persists in some scientific terminology – for example, the chemical terms "atomic weight", "molecular weight", and "formula weight", can still be found rather than the preferred "atomic mass", etc. In a different gravitational field, for example, on the surface of the Moon, an object can have a significantly different weight than on Earth. The gravity on the surface of the Moon is only about one-sixth as strong as on the surface of the Earth. A one-kilogram mass is still a one-kilogram mass (as mass is an intrinsic property of the object) but the downward force due to gravity, and therefore its weight, is only one-sixth of what the object would have on Earth. So a man of mass 180 pounds weighs only about 30 pounds-force when visiting the Moon. In most modern scientific work, physical quantities are measured in SI units. The SI unit of weight is the same as that of force: the newton (N) – a derived unit which can also be expressed in SI base units as kg⋅m/s (kilograms times metres per second squared). In commercial and everyday use, the term "weight" is usually used to mean mass, and the verb "to weigh" means "to determine the mass of" or "to have a mass of". Used in this sense, the proper SI unit is the kilogram (kg). In United States customary units, the pound can be either a unit of force or a unit of mass. Related units used in some distinct, separate subsystems of units include the poundal and the slug. The poundal is defined as the force necessary to accelerate an object of one-pound "mass" at 1 ft/s, and is equivalent to about 1/32.2 of a pound-"force". The slug is defined as the amount of mass that accelerates at 1 ft/s when one pound-force is exerted on it, and is equivalent to about 32.2 pounds (mass). The kilogram-force is a non-SI unit of force, defined as the force exerted by a one-kilogram mass in standard Earth gravity (equal to 9.80665 newtons exactly). The dyne is the cgs unit of force and is not a part of SI, while weights measured in the cgs unit of mass, the gram, remain a part of SI. The sensation of weight is caused by the force exerted by fluids in the vestibular system, a three-dimensional set of tubes in the inner ear. It is actually the sensation of g-force, regardless of whether this is due to being stationary in the presence of gravity, or, if the person is in motion, the result of any other forces acting on the body such as in the case of acceleration or deceleration of a lift, or centrifugal forces when turning sharply. Weight is commonly measured using one of two methods. A spring scale or hydraulic or pneumatic scale measures local weight, the local force of gravity on the object (strictly "apparent" weight force). Since the local force of gravity can vary by up to 0.5% at different locations, spring scales will measure slightly different weights for the same object (the same mass) at different locations. To standardize weights, scales are always calibrated to read the weight an object would have at a nominal standard gravity of 9.80665 m/s (approx. 32.174 ft/s). However, this calibration is done at the factory. When the scale is moved to another location on Earth, the force of gravity will be different, causing a slight error. So to be highly accurate and legal for commerce, spring scales must be re-calibrated at the location at which they will be used. A "balance" on the other hand, compares the weight of an unknown object in one scale pan to the weight of standard masses in the other, using a lever mechanism – a lever-balance. The standard masses are often referred to, non-technically, as "weights". Since any variations in gravity will act equally on the unknown and the known weights, a lever-balance will indicate the same value at any location on Earth. Therefore, balance "weights" are usually calibrated and marked in mass units, so the lever-balance measures mass by comparing the Earth's attraction on the unknown object and standard masses in the scale pans. In the absence of a gravitational field, away from planetary bodies (e.g. space), a lever-balance would not work, but on the Moon, for example, it would give the same reading as on Earth. Some balances are marked in weight units, but since the weights are calibrated at the factory for standard gravity, the balance will measure standard weight, i.e. what the object would weigh at standard gravity, not the actual local force of gravity on the object. If the actual force of gravity on the object is needed, this can be calculated by multiplying the mass measured by the balance by the acceleration due to gravity – either standard gravity (for everyday work) or the precise local gravity (for precision work). Tables of the gravitational acceleration at different locations can be found on the web. Gross weight is a term that is generally found in commerce or trade applications, and refers to the total weight of a product and its packaging. Conversely, net weight refers to the weight of the product alone, discounting the weight of its container or packaging; and tare weight is the weight of the packaging alone. The table below shows comparative gravitational accelerations at the surface of the Sun, the Earth's moon, each of the planets in the solar system. The “surface” is taken to mean the cloud tops of the gas giants (Jupiter, Saturn, Uranus and Neptune). For the Sun, the surface is taken to mean the photosphere. The values in the table have not been de-rated for the centrifugal effect of planet rotation (and cloud-top wind speeds for the gas giants) and therefore, generally speaking, are similar to the actual gravity that would be experienced near the poles.
In science and engineering, the weight of an object is related to the force acting on the object, either due to gravity or to a reaction force that holds it in place.
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summarize: Inclined planes are widely used in the form of "loading ramps" to load and unload goods on trucks, ships and planes. Wheelchair ramps are used to allow people in wheelchairs to get over vertical obstacles without exceeding their strength. Escalators and slanted conveyor belts are also forms of inclined plane. In a funicular or cable railway a railroad car is pulled up a steep inclined plane using cables. Inclined planes also allow heavy fragile objects, including humans, to be safely lowered down a vertical distance by using the normal force of the plane to reduce the gravitational force. Aircraft evacuation slides allow people to rapidly and safely reach the ground from the height of a passenger. Also it can be used by stunt drivers in order to jump over things Other inclined planes are built into permanent structures. Roads for vehicles and railroads have inclined planes in the form of gradual slopes, ramps, and causeways to allow vehicles to surmount vertical obstacles such as hills without losing traction on the road surface. Similarly, pedestrian paths and sidewalks have gentle ramps to limit their slope, to ensure that pedestrians can keep traction. Inclined planes are also used as entertainment for people to slide down in a controlled way, in playground slides, water slides, ski slopes and skateboard parks. Inclined planes have been used by people since prehistoric times to move heavy objects. The sloping roads and causeways built by ancient civilizations such as the Romans are examples of early inclined planes that have survived, and show that they understood the value of this device for moving things uphill. The heavy stones used in ancient stone structures such as Stonehenge are believed to have been moved and set in place using inclined planes made of earth, although it is hard to find evidence of such temporary building ramps. The Egyptian pyramids were constructed using inclined planes, Siege ramps enabled ancient armies to surmount fortress walls. The ancient Greeks constructed a paved ramp 6 km (3.7 miles) long, the Diolkos, to drag ships overland across the Isthmus of Corinth. However the inclined plane was the last of the six classic simple machines to be recognised as a machine. This is probably because it is a passive, motionless device (the load is the moving part), and also because it is found in nature in the form of slopes and hills. Although they understood its use in lifting heavy objects, the ancient Greek philosophers who defined the other five simple machines did not include the inclined plane as a machine. This view persisted among a few later scientists; as late as 1826 Karl von Langsdorf wrote that an inclined plane ""...is no more a machine than is the slope of a mountain." The problem of calculating the force required to push a weight up an inclined plane (its mechanical advantage) was attempted by Greek philosophers Heron of Alexandria (c. 10 - 60 CE) and Pappus of Alexandria (c. 290 - 350 CE), but they got it wrong. It wasn't until the Renaissance that the inclined plane was solved mathematically and classed with the other simple machines. The first correct analysis of the inclined plane appeared in the work of enigmatic 13th century author Jordanus de Nemore, however his solution was apparently not communicated to other philosophers of the time. Girolamo Cardano (1570) proposed the incorrect solution that the input force is proportional to the angle of the plane. Then at the end of the 16th century, three correct solutions were published within ten years, by Michael Varro (1584), Simon Stevin (1586), and Galileo Galilee (1592). Although it was not the first, the derivation of Flemish engineer Simon Stevin is the most well-known, because of its originality and use of a string of beads (see box). In 1600, Italian scientist Galileo Galilei included the inclined plane in his analysis of simple machines in "Le Meccaniche" ("On Mechanics"), showing its underlying similarity to the other machines as a force amplifier. The first elementary rules of sliding friction on an inclined plane were discovered by Leonardo da Vinci (1452-1519), but remained unpublished in his notebooks. They were rediscovered by Guillaume Amontons (1699) and were further developed by Charles-Augustin de Coulomb (1785). Leonhard Euler (1750) showed that the tangent of the angle of repose on an inclined plane is equal to the coefficient of friction. The mechanical advantage of an inclined plane depends on its "slope", meaning its gradient or steepness. The smaller the slope, the larger the mechanical advantage, and the smaller the force needed to raise a given weight. A plane's slope "s" is equal to the difference in height between its two ends, or ""rise"", divided by its horizontal length, or ""run"". It can also be expressed by the angle the plane makes with the horizontal, "θ". The mechanical advantage "MA" of a simple machine is defined as the ratio of the output force exerted on the load to the input force applied. For the inclined plane the output load force is just the gravitational force of the load object on the plane, its weight F. The input force is the force F exerted on the object, parallel to the plane, to move it up the plane. The mechanical advantage are... The MA of an ideal inclined plane without friction is sometimes called "ideal mechanical advantage" (IMA) while the MA when friction is included is called the "actual mechanical advantage" (AMA). If there is no friction between the object being moved and the plane, the device is called an "ideal inclined plane". This condition might be approached if the object is rolling, like a barrel, or supported on wheels or casters. Due to conservation of energy, for a frictionless inclined plane the work done on the load lifting it, W, is equal to the work done by the input force, W Work is defined as the force multiplied by the displacement an object moves. The work done on the load is just equal to its weight multiplied by the vertical displacement it rises, which is the "rise" of the inclined plane The input work is equal to the force F on the object times the diagonal length of the inclined plane. Substituting these values into the conservation of energy equation above and rearranging To express the mechanical advantage by the angle "θ" of the plane, it can be seen from the diagram "(above)" that So So the mechanical advantage of a frictionless inclined plane is equal to the reciprocal of the sine of the slope angle. The input force F from this equation is the force needed to hold the load motionless on the inclined plane, or push it up at a constant velocity. If the input force is greater than this, the load will accelerate up the plane; if the force is less, it will accelerate down the plane. Where there is friction between the plane and the load, as for example with a heavy box being slid up a ramp, some of the work applied by the input force is dissipated as heat by friction, W, so less work is done on the load. Due to conservation of energy, the sum of the output work and the frictional energy losses is equal to the input work Therefore, more input force is required, and the mechanical advantage is lower, than if friction were not present. With friction, the load will only move if the net force parallel to the surface is greater than the frictional force F opposing it. The maximum friction force is given by where F is the normal force between the load and the plane, directed normal to the surface, and "μ" is the coefficient of static friction between the two surfaces, which varies with the material. When no input force is applied, if the inclination angle "θ" of the plane is less than some maximum value "φ" the component of gravitational force parallel to the plane will be too small to overcome friction, and the load will remain motionless. This angle is called the angle of repose and depends on the composition of the surfaces, but is independent of the load weight. It is shown below that the tangent of the angle of repose "φ" is equal to "μ" With friction, there is always some range of input force F for which the load is stationary, neither sliding up or down the plane, whereas with a frictionless inclined plane there is only one particular value of input force for which the load is stationary. A load resting on an inclined plane, when considered as a free body has three forces acting on it: Using Newton's second law of motion the load will be stationary or in steady motion if the sum of the forces on it is zero. Since the direction of the frictional force is opposite for the case of uphill and downhill motion, these two cases must be considered separately: The mechanical advantage of an inclined plane is the ratio of the weight of the load on the ramp to the force required to pull it up the ramp. If energy is not dissipated or stored in the movement of the load, then this mechanical advantage can be computed from the dimensions of the ramp. In order to show this, let the position r of a rail car on along the ramp with an angle, "θ", above the horizontal be given by where "R" is the distance along the ramp. The velocity of the car up the ramp is now Because there are no losses, the power used by force "F" to move the load up the ramp equals the power out, which is the vertical lift of the weight "W" of the load. The input power pulling the car up the ramp is given by and the power out is Equate the power in to the power out to obtain the mechanical advantage as The mechanical advantage of an inclined can also be calculated from the ratio of length of the ramp "L" to its height "H," because the sine of the angle of the ramp is given by therefore, Example: If the height of a ramp is H = 1 meter and its length is L = 5 meters, then the mechanical advantage is which means that a 20 lb force will lift a 100 lb load. The Liverpool Minard inclined plane has the dimensions 1804 meters by 37.50 meters, which provides a mechanical advantage of so a 100 lb tension force on the cable will lift a 4810 lb load. The grade of this incline is 2%, which means the angle θ is small enough that sinθ=tanθ.
An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load. The inclined plane is one of the six classical simple machines defined by Renaissance scientists. Inclined planes are widely used to move heavy loads over vertical obstacles; examples vary from a ramp used to load goods into a truck, to a person walking up a pedestrian ramp, to an automobile or railroad train climbing a grade.
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summarize: The distinction between a bolt and a screw is commonly misunderstood. There are several practical differences, but most have some degree of overlap between bolts and screws. The defining distinction, per "Machinery's Handbook", is in their intended purpose: Bolts are for the assembly of two unthreaded components, with the aid of a nut. Screws in contrast are used in components which contain their own thread, and the screw may even cut its own internal thread into them. Many threaded fasteners can be described as "either" screws or bolts, depending on how they are used. Bolts are often used to make a bolted joint. This is a combination of the nut applying an axial clamping force and also the shank of the bolt acting as a dowel, pinning the joint against sideways shear forces. For this reason, many bolts have a plain unthreaded shank (called the ) as this makes for a better, stronger dowel. The presence of the unthreaded shank has often been given as characteristic of bolts vs. screws, but this is incidental to its use, rather than defining. The unthreaded grip length should be chosen carefully, to be around the same length as the thickness of the material and washers through which the bolt passes. An overly long unthreaded length prevents the nut from being tightened down correctly. An insufficient unthreaded length results in the threads extending into the hole, and places the dowel shear load onto the threads, which may cause fretting wear on the hole. No more than two turns of the thread should be within the hole. Where a fastener forms its own thread in the component being fastened, it is called a screw. This is most obviously so when the thread is tapered (i.e. traditional wood screws), precluding the use of a nut, or when a sheet metal screw or other thread-forming screw is used. A screw must always be turned to assemble the joint. Many bolts are held fixed in place during assembly, either by a tool or by a design of non-rotating bolt, such as a carriage bolt, and only the corresponding nut is turned. Bolts use a wide variety of head designs, as do screws. These are designed to engage with the tool used to tighten them. Some bolt heads instead lock the bolt in place, so that it does not move and a tool is only needed for the nut end. Common bolt heads include hex, slotted hex washer, and socket cap. The first bolts had square heads, formed by forging. These are still found, although much more common today is the hexagonal head. These are held and turned by a spanner or wrench, of which there are many forms. Most are held from the side, some from in-line with the bolt. Other bolts have T-heads and slotted heads. Many screws use a screwdriver head fitting, rather than an external wrench. Screwdrivers are applied in-line with the fastener, rather than from the side. These are smaller than most wrench heads and cannot usually apply the same amount of torque. It is sometimes assumed that screwdriver heads imply a screw and wrenches imply a bolt, although this is incorrect. Coach screws are large square-headed screws with a tapered wood screw thread, used for attaching ironwork to timber. Head designs that overlap both are the Allen or Torx heads; hexagonal or splined sockets. These modern designs span a large range of sizes and can carry a considerable torque. Regarding the requirement of the strength and circumstance, there are several types of material can be used for the Fastener Material Selection.
A bolt is a form of threaded fastener with an external male thread. Bolts are very closely related to screws.
en
en
22
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summarize: The specific weight, "γ", of a material is defined as the product of its density, formula_1, and the standard gravity, "g": The density of the material is defined as mass per unit volume, typically measured in kg/m. The standard gravity is acceleration due to gravity, usually given in m/s, and on Earth usually taken as 9.81 m/s. Unlike density, specific weight is not a fixed property of a material. It depends on the value of the gravitational acceleration, which varies with location. Pressure may also affect values, depending upon the bulk modulus of the material, but generally, at moderate pressures, has a less significant effect than the other factors. In fluid mechanics, specific weight represents the force exerted by gravity on a unit volume of a fluid. For this reason, units are expressed as force per unit volume (e.g., N/m or lbf/ft). Specific weight can be used as a characteristic property of a fluid. Specific weight is often used as a property of soil to solve earthwork problems. In soil mechanics, specific weight may refer to: where The formula for dry unit weight is: where The formula for saturated unit weight is: where The formula for submerged unit weight is: where Specific weight can be used in civil engineering and mechanical engineering to determine the weight of a structure designed to carry certain loads while remaining intact and remaining within limits regarding deformation.
The specific weight, also known as the unit weight, is the weight per unit volume of a material. A commonly used value is the specific weight of water on Earth at 4°C, which is 9.807 kN/m or 62.43 lbf/ft.
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summarize: The speed of light in vacuum is usually denoted by a lowercase, for "constant" or the Latin (meaning "swiftness, celerity"). In 1856, Wilhelm Eduard Weber and Rudolf Kohlrausch had used for a different constant later shown to equal times the speed of light in vacuum. Historically, the symbol "V" was used as an alternative symbol for the speed of light, introduced by James Clerk Maxwell in 1865. In 1894, Paul Drude redefined with its modern meaning. Einstein used "V" in his original German-language papers on special relativity in 1905, but in 1907 he switched to, which by then had become the standard symbol for the speed of light. Sometimes is used The speed at which light waves propagate in vacuum is independent both of the motion of the wave source and of the inertial frame of reference of the observer. This invariance of the speed of light was postulated by Einstein in 1905, after being motivated by Maxwell's theory of electromagnetism and the lack of evidence for the luminiferous aether; it has since been consistently confirmed by many experiments. It is only possible to verify experimentally that the two-way speed of light (for example, from a source to a mirror and back again) is frame-independent, because it is impossible to measure the one-way speed of light (for example, from a source to a distant detector) without some convention as to how clocks at the source and at the detector should be synchronized. However, by adopting Einstein synchronization for the clocks, the one-way speed of light becomes equal to the two-way speed of light by definition. The special theory of relativity explores the consequences of this invariance of "c" with the assumption that the laws of physics are the same in all inertial frames of reference. One consequence is that "c" is the speed at which all massless particles and waves, including light, must travel in vacuum. Special relativity has many counterintuitive and experimentally verified implications. These include the equivalence of mass and energy, length contraction (moving objects shorten), and time dilation (moving clocks run more slowly). The factor "γ" by which lengths contract and times dilate is known as the Lorentz factor and is given by, where "v" is the speed of the object. The difference of "γ" from1 is negligible for speeds much slower than "c", such as most everyday speeds—in which case special relativity is closely approximated by Galilean relativity—but it increases at relativistic speeds and diverges to infinity as "v" approaches "c". For example, a time dilation factor of "γ" = 2 occurs at a relative velocity of 86.6% of the speed of light ("v" =.866"c"). Similarly, a time dilation factor of "γ" = 10 occurs at "v" = 99.5% "c". The results of special relativity can be summarized by treating space and time as a unified structure known as spacetime (with "c" relating the units of space and time), and requiring that physical theories satisfy a special symmetry called Lorentz invariance, whose mathematical formulation contains the parameter "c". Lorentz invariance is an almost universal assumption for modern physical theories, such as quantum electrodynamics, quantum chromodynamics, the Standard Model of particle physics, and general relativity. As such, the parameter "c" is ubiquitous in modern physics, appearing in many contexts that are unrelated to light. For example, general relativity predicts that "c" is also the speed of gravity and of gravitational waves. In non-inertial frames of reference (gravitationally curved spacetime or accelerated reference frames), the "local" speed of light is constant and equal to "c", but the speed of light along a trajectory of finite length can differ from "c", depending on how distances and times are defined. It is generally assumed that fundamental constants such as "c" have the same value throughout spacetime, meaning that they do not depend on location and do not vary with time. However, it has been suggested in various theories that the speed of light may have changed over time. No conclusive evidence for such changes has been found, but they remain the subject of ongoing research. It also is generally assumed that the speed of light is isotropic, meaning that it has the same value regardless of the direction in which it is measured. Observations of the emissions from nuclear energy levels as a function of the orientation of the emitting nuclei in a magnetic field (see Hughes–Drever experiment), and of rotating optical resonators (see Resonator experiments) have put stringent limits on the possible two-way anisotropy. There are situations in which it may seem that matter, energy, or information travels at speeds greater than "c", but they do not. For example, as is discussed in the propagation of light in a medium section below, many wave velocities can exceed "c". For example, the phase velocity of X-rays through most glasses can routinely exceed "c", but phase velocity does not determine the velocity at which waves convey information. If a laser beam is swept quickly across a distant object, the spot of light can move faster than "c", although the initial movement of the spot is delayed because of the time it takes light to get to the distant object at the speed "c". However, the only physical entities that are moving are the laser and its emitted light, which travels at the speed "c" from the laser to the various positions of the spot. Similarly, a shadow projected onto a distant object can be made to move faster than "c", after a delay in time. In neither case does any matter, energy, or information travel faster than light. The rate of change in the distance between two objects in a frame of reference with respect to which both are moving (their closing speed) may have a value in excess of "c". However, this does not represent the speed of any single object as measured In classical physics, light is described as a type of electromagnetic wave. The classical behaviour of the electromagnetic field is described by Maxwell's equations, which predict that the speed "c" with which electromagnetic waves (such as light) propagate in vacuum is related to the distributed capacitance and inductance of vacuum, otherwise respectively known as the electric constant "ε" and the magnetic constant "μ", by the equation In modern quantum physics, the electromagnetic field is described by the theory of quantum electrodynamics (QED). In this theory, light is described by the fundamental excitations (or quanta) of the electromagnetic field, called photons. In QED, photons are massless particles and thus, according to special relativity, they travel at the speed of light in vacuum. Extensions of QED in which the photon has a mass have been considered. In such a theory, its speed would depend on its frequency, and the invariant speed "c" of special relativity would then be the upper limit of the speed of light in vacuum. No variation of the speed of light with frequency has been observed in rigorous testing, putting stringent limits on the mass of the photon. The limit obtained depends on the model used: if the massive photon is described by Proca theory, the experimental upper bound for its mass is about 10 grams; if photon mass is generated by a Higgs mechanism, the experimental upper limit is less sharp, (roughly 2 × 10 g). Another reason for the speed of light to vary with its frequency would be the failure of special relativity to apply to arbitrarily small scales, as predicted by some proposed theories of quantum gravity. In 2009, the observation of gamma-ray burst GRB 090510 found no evidence for a dependence of photon speed on energy, supporting tight constraints in specific models of spacetime quantization on how this speed is affected by photon energy for energies approaching the Planck scale. In a medium, light usually does not propagate at a speed equal to "c"; further, different types of light wave will travel at different speeds. The speed at which the individual crests and troughs of a plane wave (a wave filling the whole space, with only one frequency) propagate is called the phase velocity "v". An actual physical signal with a finite extent (a pulse of light) travels at a different speed. The largest part of the pulse travels at the group velocity "v", and its earliest part travels at the front velocity "v". The phase velocity is important in determining how a light wave travels through a material or from one material to another. It is often represented in terms of a "refractive index". The refractive index of a material is defined as the ratio of "c" to the phase velocity "v" in the material: larger indices of refraction indicate lower speeds. The refractive index of a material may depend on the light's frequency, intensity, polarization, or direction of propagation; in many cases, though, it can be treated as a material-dependent constant. The refractive index of air is approximately 1.0003. Denser media, such as water, glass, and diamond, have refractive indexes of around 1.3, 1.5 and 2.4, respectively, for visible light. In exotic materials like Bose–Einstein condensates near absolute zero, the effective speed of light may be only a few metres per second. However, this represents absorption and re-radiation delay between atoms, as do all slower-than-"c" speeds in material substances. As an extreme example of light "slowing" in matter, two independent teams of physicists claimed to bring light to a "complete standstill" by passing it through a Bose–Einstein condensate The speed of light is of relevance to communications: the one-way and round-trip delay time are greater than zero. This applies from small to astronomical scales. On the other hand, some techniques depend on the finite speed of light, for example in distance measurements. In supercomputers, the speed of light imposes a limit on how quickly data can be sent between processors. If a processor operates at 1gigahertz, a signal can travel only a maximum of Given that the equatorial circumference of the Earth is about and that "c" is about, the theoretical shortest time for a piece of information to travel half the globe along the surface is about 67 milliseconds. When light is Similarly, communications between the Earth and spacecraft are not instantaneous. There is a brief delay from the source to the receiver, which becomes more noticeable as distances increase. This delay was significant for communications between ground control and Apollo 8 when it became the first manned spacecraft to orbit the Moon: for every question, the ground control station had to wait at least three seconds for the answer to arrive. The communications delay between Earth and Mars can vary between five and twenty minutes depending upon the relative positions of the two planets. As a consequence of this, if a robot on the surface of Mars were to encounter a problem, its human controllers would not be aware of it until at least five minutes later, and possibly up to twenty minutes later; it would then take a further five to twenty minutes for instructions Radar systems measure the distance to a target by the time it takes a radio-wave pulse to return to the radar antenna after being reflected by the target: the distance to the target is half the round-trip transit time multiplied by the speed of light. A Global Positioning System (GPS) The speed of light has become important in high-frequency trading, where traders seek to gain minute advantages by delivering their trades to exchanges fractions of a second There are different ways to determine the value of "c". One way is to measure the actual speed at which light waves propagate, which can be done in various astronomical and earth-based setups. However, it is also possible to determine "c" from other physical laws where it appears, for example, by determining the values of the electromagnetic constants "ε" and "μ" and using their relation to "c". Historically, the most accurate results have been obtained by separately determining the frequency and wavelength of a light beam, with their product equalling "c". In 1983 the metre was defined as "the length of the path travelled by light in vacuum during a time interval of of a second", fixing the value of the speed of light at by definition, as described below. Consequently, accurate measurements of the speed of light yield an accurate realization of the metre rather than an accurate value of "c". Outer space is a convenient setting for measuring the speed of light because of its large scale and nearly perfect vacuum. Typically, one measures the time needed for light to traverse some reference distance in the solar system, such as the radius of the Earth's orbit. Historically, such measurements could be made fairly accurately, compared to how accurately the length of the reference distance is known in Earth-based units. It is customary to express the results in astronomical units (AU) per day. Ole Christensen Rømer used an astronomical measurement to make the first quantitative estimate of the speed of light in the year 1676. When measured from Earth, the periods of moons orbiting a distant planet are shorter when the Earth is approaching the planet than when the Earth is receding from it. The distance travelled by light from the planet (or its moon) to Earth is shorter when the Earth is at the point in its orbit that is closest to its planet than when the Earth is at the farthest point in its A method of measuring the speed of light is to measure the time needed for light to travel to a mirror at a known distance and back. This is the working principle behind the Fizeau–Foucault apparatus developed by Hippolyte Fizeau and Léon Foucault. The setup as used by Fizeau consists of a beam of light directed at a mirror away. On the way from the source to the mirror, the beam passes through a rotating cogwheel. At a certain rate of rotation, the beam passes through one gap on the way out and another on the way back, but at slightly higher or lower rates, the beam strikes a tooth and does not pass An option for deriving "c" that does not directly depend on a measurement of the propagation of electromagnetic waves is to use the relation between "c" and the vacuum permittivity "ε" and vacuum permeability "μ" Another way to measure the speed of light is to independently measure the frequency "f" and wavelength "λ" of an electromagnetic wave in vacuum. The value of "c" can then be found by using the relation "c" = "fλ". One option is to measure the resonance frequency of a cavity resonator. If the dimensions of the resonance cavity are also known, these can be used to determine the wavelength of the wave. In 1946, Louis Essen and A.C. Gordon-Smith established the frequency for a variety of normal modes of microwaves of a microwave cavity of precisely known dimensions. The dimensions were established to an accuracy of about ±0.8 μm using Interferometry is another method to find the wavelength of electromagnetic radiation for determining the speed of light. A coherent beam of light (e.g. from a laser), with a known frequency ("f"), is split to follow two paths and then recombined. By adjusting the path length while observing the interference pattern and carefully measuring the change in path length, the wavelength of the light ("λ") can be determined. The speed of light is then calculated using the equation "c" = "λf". Before the advent of laser technology, coherent radio sources were used for interferometry measurements of the speed Until the early modern period, it was not known whether light travelled instantaneously or at a very fast finite speed. The first extant recorded examination of this subject was in ancient Greece. The ancient Greeks, Muslim scholars, and classical European scientists long debated this until Rømer provided the first calculation of the speed of light. Einstein's Theory of Special Relativity concluded that the speed of light is constant regardless of one's frame of reference. Since then, scientists have provided increasingly accurate measurements. Empedocles (c. 490–430 BC) was the first to propose a theory of light and claimed that light has a finite speed. He maintained that light was something in motion, and therefore must take some time to travel. Aristotle argued, to the contrary, that "light is due to the presence of something, but it is not a movement". Euclid and Ptolemy advanced Empedocles' emission theory of vision, where light is emitted from the eye, thus enabling sight. Based on that theory, Heron of Alexandria argued that the speed of light must be infinite because distant objects such as stars appear immediately upon opening the eyes. Early Islamic philosophers initially agreed with the Aristotelian view that light had no speed of travel. In 1021, Alhazen (Ibn al-Haytham) published the "Book of Optics", in which he presented a series of arguments dismissing the emission theory of vision in favour of the now accepted intromission theory, in which light moves from an object into the eye. This led Alhazen to propose that light must have In 1629, Isaac Beeckman proposed an experiment in which a person observes the flash of a cannon reflecting off a mirror about one mile (1.6 km) away. In 1638, Galileo Galilei proposed an experiment, with an apparent claim to having performed it some years earlier, to measure the speed of light by observing the delay between uncovering a lantern and its perception some distance away. He was unable to distinguish whether light travel was instantaneous or not, but concluded that if it were not, it must nevertheless be extraordinarily rapid. In 1667, the Accademia del Cimento of Florence reported that it had performed Galileo's experiment, with the lanterns separated by about one mile, but no delay was observed. The actual delay in this experiment would have been about 11 microseconds. The first quantitative estimate of the speed of light was made in In the 19th century Hippolyte Fizeau developed a method to determine the speed of light based on time-of-flight measurements on Earth and reported a value of. His method was improved upon by Léon Foucault who obtained a value of in 1862. In the year 1856, Wilhelm Eduard Weber and Rudolf Kohlrausch measured the ratio of the electromagnetic and electrostatic units of charge, 1/, by discharging a Leyden It was thought at the time that empty space was filled with a background medium called the luminiferous aether in which the electromagnetic field existed. Some physicists thought that this aether acted as a preferred frame of reference for the propagation of light and therefore it should be possible to measure the motion of the Earth with respect to this medium, by measuring the isotropy of the speed of light. Beginning in the 1880s several experiments were performed to try to detect this motion, the most famous of which is the experiment performed by Albert A. Michelson and Edward W. Morley in 1887. The detected motion was always In 1905 Einstein postulated from the outset that the speed of light in vacuum, measured by a non-accelerating observer, is independent of the motion of the source or observer. Using this and the principle of relativity In the second half of the 20th century much progress was made in increasing the accuracy of measurements of the speed of light, first by cavity resonance techniques and later by laser interferometer techniques. These were aided by new, more precise, definitions of the metre and second. In 1950, Louis Essen determined the speed as, using cavity resonance. This value was adopted by the 12th General Assembly of the Radio-Scientific Union in 1957. In 1960, the metre was In 1983 the 17th CGPM found that wavelengths from frequency measurements and a given value for the speed of light are more reproducible than the previous standard. They kept the 1967 definition of second, so the caesium hyperfine frequency would now determine both the second and the metre. To do this, they redefined the metre as: "The metre is the length of the path travelled by light in vacuum during a time interval of 1/ of a second." As a result of this definition, the value of the speed of light in vacuum is exactly and has become a defined constant in the SI system of units. Improved experimental techniques
The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics. Its exact value is defined as (approximately ). It is exact because by international agreement a metre is defined as the length of the path travelled by light in vacuum during a time interval of second. According to special relativity, is the upper limit for the speed at which conventional matter and information can travel. Though this speed is most commonly associated with light, it is also the speed at which all massless particles and field perturbations travel in vacuum, including electromagnetic radiation and gravitational waves. Such particles and waves travel at regardless of the motion of the source or the inertial reference frame of the observer. Particles with nonzero rest mass can approach, but can never actually reach it. In the special and general theories of relativity, interrelates space and time, and also appears in the famous equation of mass–energy equivalence.
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summarize: Peck was born on April 5, 1916, in San Diego, California, to Bernice Mae "Bunny" (née Ayres; 1894–1992), and Gregory Pearl Peck (1886–1962), a Rochester, New York-born chemist and pharmacist. His father was of English (paternal) and Irish (maternal) heritage, and his mother was of English and Scots ancestry. She converted to her husband's religion, Catholicism, and Peck was raised as a Catholic. Through his Irish-born paternal grandmother Catherine Ashe (1864–1926), Peck was related to Thomas Ashe (1885–1917), who participated in the Easter Rising less than three weeks after Peck's birth and died while being force-fed during his hunger strike in 1917. Peck's parents divorced when he was five, and he was brought up by his maternal grandmother, who took him to the movies every week. At the age of 10, he was sent to a Catholic military school, St. John's Military Academy in Los Angeles. While he was a student there, his grandmother died. At 14, he moved back to San Diego Peck did not graduate with his friends because he lacked one course. His college friends were concerned for him and wondered how he would get along without his degree. "I have all I need from the university", he told them. Peck dropped the name "Eldred" and headed to New York City to study at the Neighborhood Playhouse with the legendary acting teacher Sanford Meisner. He was often broke, and sometimes slept in Central Park. He worked at the 1939 World's Fair as a barker, and Rockefeller Center as a tour guide for NBC television, and at Radio City Music Hall. He dabbled in modelling before, in 1940, working in exchange for food at the Barter Theatre in Abingdon, Virginia, where he appeared in five plays, including "Family Portrait" and "On Earth As It Is". His stage career began in 1941, when he played After about 50 plays in total, including three short-lived Broadway plays, four or five road tours, and the rest during summer theater, Peck was offered his first film role, the male lead in the war-romance "Days of Glory" (1944), directed by Jacques Tourneur, alongside top-billed Tamara Toumanova, a Russian-born ballerina. Peck portrayed the leader of Russian guerrillas resisting the Germans in 1941 who stumble across a beautiful Russian dancer (Toumanova), who had been sent to entertain Russian troops, and protect her by letting her join their group. During production of the film, Tourneur "untrained" Peck from his theater training where he was used to speaking in a formal manner and projecting his voice to the entire hall. Peck considered his performance in the film as quite amateurish and did not wish to watch the film after it was released. The film lost money at the box office, disappeared from theaters quickly, and was largely dismissed by critics. At the time of release, film critic Bosley Crowther of "The New York Times" assessed it as slow-moving and verbose adding that Peck's acting was stiff. In recent decades, of the four reviews or comments on the film available from several recognized film critics/writers or prominent English-language publications or websites (Leonard Maltin, Christopher Tookie, David Thompson, Barry Monush, Michael Gebert, "AllMovie", "TV Guide", "TimeOut", "RadioTimes"), opinions on the movie are mixed, with some of the sources saying it is too verbose or plodding, but "TimeOut" saying "it's sober and surprisingly convincing, even making the romantic interludes with Toumanova unforced and natural. Quite beautifully directed." Despite the film's lack of success, critics and audiences were in agreement that Peck had screen potential. Film historian Barry Monush wrote, "Peck's star power was evident from the word go." Hollywood movie producers became very interested in him, but rather than signing an exclusive long-term contract with one studio, he decided to freelance, Peck's next release was the modest-budget, serious adult drama, "The Macomber Affair" (1947), concerning a couple who go on an African hunting trip with their guide played by Peck. During the trip, the wife, played by Joan Bennett, becomes enamored with Peck, and the husband gets shot. Although the performers never left the United States, African footage was cut into the story. Peck was very active in the development of the film, including recommending the director, Zoltan Korda. The film received positive reviews but was mostly overlooked by the public upon its release and in later decades, which Peck would later say disappointed him. In November 1947, Peck's next film, the landmark "Gentleman's Agreement", directed by Elia Kazan, was released and was immediately proclaimed as "Hollywood's first major attack on anti-Semitism." Based on a novel, the film has Peck portraying a New York magazine writer who pretends to be Jewish so he can experience personally the hostility of bigots. It was nominated for eight Academy Awards, including Peck for Best Actor, and won Best Film and Best Director, picks which the New York Film Critics Circle and the Golden Globes affirmed. It was also a hit, challenging for the position of top-grossing film of 1948 with $3.9 million, $600,000 behind the top film. Peck would indicate in his later years that this was one of his movies of which he was most proud. Upon release, "Gentleman's Agreement" was widely praised for both its courageousness and its quality, with In the early 1950s Peck had lead roles in two westerns, the first being "The Gunfighter" (1950), directed by Henry King, who had directed "Twelve O'Clock High". Peck plays an aging "Top Gun of the West" who is now weary of killing and wishes to retire with his alluring but pragmatic wife and his seven-year-old son, both of which he has not seen for many years. Peck and King did much photographic research about the Wild West Era and had discovered that most cowboys had mustaches, or even beards, had "bowl" haircuts and wore beat-up clothing, so Peck decided to wear a mustache in a film role for the first time to give his character greater period authenticity. "The Gunfighter" did fair but disappointing business at the box office, earning $5.6 million in receipts, the 47th most for 1951. Twentieth Century Fox's studio chief Darryl Zanuck blamed Peck's mustache for turning potential young female film-goers off, because most of them wanted to see usual handsome, clean-shaven Peck, not the authentic-cowboy Peck. Peck later said when the studio's President saw some footage with him wearing mustache two weeks into the shoot, he wanted to re-shoot everything, but balked when he was told the cost, which was actually double the real cost as the production manager had been persuaded by Peck and King to inflate the amount. Jeremy Arnold of TCM says the mustache causing the poor box office of the film is probably an exaggeration, "but it's possible that the overall sparse, understated, antihero grunginess of "The Gunfighter" was not what Peck fans wanted to see in 1950." "The Gunfighter", which is a psychological western, a character study with little action, received "solid reviews" upon release, with some critics "raving over it" and Peck's performance "bringing him some of his best notices." Bosley Crowther wrote, that it is "one of the tautest and most stimulating Westerns of the year... Good writing, good direction and good acting provides some of the slickest, sharpest drama you will get in this type of film... [with] a lot of incidents of humorous, dramatic, sentimental and even poignant quality [its] an intriguing film which actually says a little something about the strangeness of the vainglory of man. And through Peck's fine performance, a fair comprehension is conveyed of the loneliness and the isolation of a man with a lurid name... played shrewdly by Peck... an arresting and quite exciting film." The movie has grown in critical appreciation over the years and "is now considered one of the all-time classic westerns" A number of critics particularly cite its realistic portrayal of the West in the late 19th-century and With his acclaimed performance in "The Gunfighter", Peck was offered the lead role in "High Noon" but turned it down because he did not want to become typecast as a Westerns actor. Peck then based himself out of the UK for about eighteen months between 1953 and 1955. This was because new US tax laws had drastically raised the tax rate on high-income earners, but the tax amount due would be reduced if you worked outside the country for extended periods. As a result, in addition to "Roman Holiday" filmed in Rome, his three following films were shot and set in London, Germany and Southeast Asia. The film shot in London was another comedy, "The Million Pound Note" (1954), based on a Mark Twain short story. Peck was later said to have loved making the film because "it was a good comedy opportunity", "no expense was spared on the best and sometimes ornate interior sets," and "he was given probably the most elegant wardrobe he had ever worn in film." Peck plays a penniless American seaman in 1903 London who is given a one million pound bank note by two rich, eccentric brothers who wish to ascertain if he can survive for one month without spending any of it. Peck is able to get posh digs, is feted by high society, has success in the stock market, and finds a romantic partner but can it last?. When released, reviews of the movie were mixed and the film performed only modestly at the box office. Three prominent reviewers all lauded "The Million Pound Notes's" production, such as the Edwardian horse-and-buggy era settings, but each had some other reservations. "The New York Tribune" lamented "it cannot make up its mind whether it wants to be a breezy satire on human vanity or a fancy period romance" and that Peck's "touch with comedy is light, but guarded, almost suspicious." Bosley Crowther felt it lacks "bounce and buoyancy...to make it spark with humor (or) glow with warmth and charm" so it "ambles along very nicely...having some mild, gracious fun. "Variety's" concern was "the yarn suffers from the protracted exploitation Peck's next movie, the western "The Bravados" (1958), reunited him with now 72-year-old director Henry King after a six-year gap. In their six films together, King was able to draw out some of Peck's best performances, most often in characters who appeared strong and authoritative but had inner demons and character flaws that could destroy them; only one character Peck played under King's direction could be considered, on balance, a good person, that of Bomber Commander Frank Savage in "Twelve O'Clock High". Finnish film writer Peter von Bagh wrote, some collaborations produce routine results, but that with Peck and King the collaboration "was primed to an ever greater creative pitch and turned out to be mutually rewarding." Only their last film together, the succeeding years’ "Beloved Infidel" (1959), was not either a critical or commercial success. Peck once said "King was like an older brother, even a father figure. We communicated without talking anything to death. It was direction by osmosis." Peck also said "he provided me with a one-man audience, in whom I had complete trust...If I played to him and he liked it, then I was fairly confident I was on the right track." In "The Bravados", Peck's character spends weeks pursuing four outlaws whom he believes raped and then murdered his wife. He succeeds in tracking them down and kills three of them in vengeance, but a climactic twist leaves his character agonizing over whether he is any better a person than the fugitives. Upon its opening, A.H. Weiler of "The New York Times" wrote, the movie "is executed intelligently in fine, brooding style against eye-filling, authentic backgrounds, so its basically familiar ingredients glisten with professional polish", that "the general tautness of the yarn is accentuated by a tightly written script," and that "the producers have given their essentially grim "chase" equally colorful and arresting treatment." The film was After having no movies released in 1960, Peck's first release of 1961 was the big-budget ($6 million) WWII adventure "The Guns of Navarone", in which his six-man British and Greek commando team, which also includes David Niven and Anthony Quinn, undertakes a multi-step mission to destroy two seemingly impregnable cliff-top German radar-controlled artillery guns on the Greek island of Navarone. The team of specialists (Peck is the mountain climbing expert) need to destroy the guns so British ships can evacuate across the Aegean Sea two-thousand trapped British soldiers. Derived from a fact-based novel, subplots during the mission include finding a traitor in their midst, personal differences and bad history between characters, and debates about the morality of warfare. The movie was a huge hit becoming the top-grossing movie of 1961, and became "one of the most popular adventure movies of its day." It landed seven Academy Award nominations, including for best picture, director, and screenplay, winning for best special effects, while at the Golden Globe Awards it won for Best Dramatic Movie. It also won the BAFTA for Best British Screenplay. Several actors, including Cary Grant (who at 50 was deemed too old), James Mason, and William Holden (who asked for too much money), were considered for Peck's leading role before Peck was hired (at the same price that William Holden had asked for, plus a percentage of the box office). During filming, Peck said the fact his team seems to defeat "the entire German army" approached parody, concluding the only way to make it work was for all the performers to "play their roles with complete conviction." Director J. Lee Thompson had to balance the story and script preferences of three big-name actors, and did incorporate many of the dialogue and character development suggestions of Peck, such that Peck was so impressed he offered him the job of directing the next film he was producing, "Cape Fear." Peck and Niven became good friends during the filming and Peck gave the eulogy at Niven's funeral many years later. Niven developed a severe Peck served as the president of the Academy of Motion Picture Arts and Sciences in 1967, Chairman of the Board of Trustees of the American Film Institute from 1967 to 1969, Chairman of the Motion Picture and Television Relief Fund in 1971, and National Chairman of the American Cancer Society in 1966. He was a member of the National Council on the Arts from 1964 to 1966. In the 1980s, Peck moved to television, where he starred in the mini-series "The Blue and the Gray", playing Abraham Lincoln. He also starred with Christopher Plummer, John Gielgud, and Barbara Bouchet in the television film "The Scarlet and The Black", about Monsignor Hugh O'Flaherty, a real-life Catholic priest in the Vatican who smuggled Jews and other refugees away from the Nazis during World War II. Peck, Mitchum, and Martin Balsam all had roles in the 1991 remake of "Cape Fear", directed by Martin Scorsese. All three were in the original 1962 version. In the remake, Peck played Max Cady's lawyer. His last prominent film role also came in 1991, in "Other People's Money", directed by Norman Jewison and based on the stage play of that name. Peck played a In 1947, while many Hollywood figures were being blacklisted for similar activities, Peck signed a letter deploring a House Un-American Activities Committee investigation of alleged communists in the film industry. A life-long Democrat, Peck was suggested in 1970 as a possible Democratic candidate to run against Ronald Reagan for the office of California Governor. Although he later admitted that he had no interest in being a candidate himself for public office, Peck encouraged one of his sons, Carey Peck, to run for political office. Carey was defeated both times by slim margins in races in 1978 and 1980 against Republican U.S. Representative Bob Dornan, another former actor. Peck revealed that former President Lyndon Johnson had told him that, had he sought re-election in 1968, he intended to offer Peck the post of U.S. ambassador to Ireland – a post Peck, owing to his Irish ancestry, said he might well have taken, saying, "[It] would have been a great adventure". In October 1942, Peck married Finnish-born Greta Kukkonen (1911–2008), with whom he had three sons: Jonathan (1944–1975), Stephen (b. 1946), and Carey Paul (b. 1949). They were divorced on December 31, 1955. During his marriage with Greta, Peck had a brief affair with "Spellbound" co-star Ingrid Bergman. He confessed the affair to Brad Darrach of "People" in a 1987 interview, saying: "All I can say is that I had a real love for her (Bergman), and I think that's where I ought to stop...I was young. She was young. We were involved for weeks in close and intense work." On New Year's Eve in 1955, the day after his divorce was finalized, Peck married Véronique Passani (1932–2012), a Paris news reporter who had interviewed him in 1952 before he went to Italy to film "Roman Holiday". He asked her to lunch six months later, and they became inseparable. They had a son, Anthony Peck (b. 1956), and a daughter, Cecilia Peck (b. On June 12, 2003, Peck died in his sleep from bronchopneumonia at the age of 87 at his home in Los Angeles. His wife, Veronique, was by his side. Gregory Peck is entombed in the Cathedral of Our Lady of the Angels mausoleum in Los Angeles. His eulogy was read by Brock Peters, whose character, Tom Robinson, was defended by Peck's Atticus Finch in "To Kill a Mockingbird". The celebrities who attended Peck's funeral included Lauren Bacall, Sidney Poitier, Harry Belafonte, Shari Belafonte, Harrison Ford, Calista Flockhart, Mike Farrell, Shelley Fabares, Jimmy Smits, Louis Jourdan, Dyan Cannon, Stephanie Zimbalist, Michael York, Angie Dickinson, Larry Gelbart, Michael Jackson, Anjelica Huston, Lionel Richie, Louise Fletcher, Tony Danza, and Piper Laurie. The Gregory Peck Award for Cinematic Excellence was created by the Peck family in 2008 to commemorate their father by honoring a director, producer or actor's life's work. Originally presented at the Peck was nominated for five Academy Awards, winning once. He was nominated for "The Keys of the Kingdom" (1945), "The Yearling" (1946), "Gentleman's Agreement" (1947), and "Twelve O'Clock High" (1949). He won the Academy Award for Best Actor for his role as Atticus Finch in the 1962 film "To Kill a Mockingbird". In 1967, he received the Academy's Jean Hersholt Humanitarian Award. Peck also received many Golden Globe awards. He won in 1947 for "The Yearling", in 1963 for "To Kill a Mockingbird", and in 1999 for the TV mini-series "Moby Dick". He was nominated in 1978 for "The Boys from Brazil". He received the Cecil B. DeMille Award in 1969, and was given the Henrietta Award in 1951 and 1955 for "World Film Favorite – Male". In 1969, 36th U.S. President Lyndon B. Johnson honored Peck with the Presidential Medal of Freedom, the nation's highest civilian honor. In 1971, the Screen Actors Guild presented Peck with the SAG Life Achievement Award. In 1989, the American Peck donated his personal collection of home movies and prints of his feature films to the Film Archive of the Academy of Motion Picture Arts and Sciences in 1999. The film material at the Academy Film Archive is complemented by printed materials in the Gregory Peck papers at the Academy's Margaret Herrick Library.
Eldred Gregory Peck (April 5, 1916 – June 12, 2003) was an American actor. He was one of the most popular film stars from the 1940s to the 1960s. Peck received five nominations for Academy Award for Best Actor and won once – for his performance as Atticus Finch in the 1962 drama film "To Kill a Mockingbird". Peck's other Oscar-nominated roles are in "The Keys of the Kingdom" (1944), "The Yearling" (1946), "Gentleman's Agreement" (1947), and "Twelve O'Clock High" (1949).
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134729, 7, 1295, 70, 502, 1517, 89829, 6, 157215, 1460, 2594, 25, 7, 11737, 14277, 4, 70, 171827, 44, 3957, 6163, 34952, 7, 58, 5173, 71716, 4, 41186, 3674, 4049, 678, 5036, 9464, 9, 46799, 9, 18345, 14364, 45233, 18813, 7103, 10, 37195, 9, 46799, 43599, 5, 360, 2363, 37195, 54180, 25842, 4, 18813, 509, 19048, 47, 79442, 1810, 3060, 111, 1460, 2594, 25, 7, 2965, 23718, 7, 4, 2684, 27983, 23, 124850, 2750, 118775, 37515, 136, 42179, 913, 4935, 1284, 1902, 75414, 77793, 7, 136, 62816, 1238, 19729, 7, 450, 5809, 163684, 2856, 74, 4734, 1632, 62816, 1460, 2594, 112730, 1379, 18813, 25, 7, 48225, 5809, 186, 90698, 4, 98, 40197, 4, 10, 4127, 3445, 4, 450, 111, 82514, 56, 123573, 56, 17819, 98167, 429, 23, 44, 618, 8420, 272, 180, 25, 441, 21135, 19694, 740, 21079, 4745, 1346, 6, 70035, 7948, 542, 177161, 54397, 4, 3060, 133258, 7, 27489, 124374, 50339, 4, 1284, 450, 678, 1460, 2594, 136, 18813, 70, 133258, 44, 13689, 20809, 71, 47, 142, 17669, 117396, 85403, 163451, 136, 69347, 1810, 47, 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62816, 10, 6126, 84382, 645, 36766, 764, 83, 2499, 11522, 10, 3445, 3501, 70, 116131, 42991, 5, 345, 5416, 6863, 73432, 4, 62, 5, 841, 5, 104998, 56, 111, 44, 3957, 2356, 5753, 19114, 58, 54397, 4, 70, 14277, 44, 164, 71924, 297, 54497, 538, 23, 5885, 4, 120977, 214, 20623, 26548, 36298, 9, 116115, 214, 4, 195734, 76615, 7, 4, 221, 6863, 198343, 16031, 145170, 1978, 2581, 678, 23182, 13492, 127, 830, 450, 44, 2347, 4537, 5705, 18, 7432, 111, 70, 38933, 19, 83, 78550, 34, 27686, 390, 10, 107137, 538, 59121, 26499, 4, 58, 136, 450, 44, 2347, 108558, 7, 765, 34475, 2363, 85590, 538, 118432, 44, 1436, 184, 58, 105950, 538, 10576, 7844, 136, 34784, 214, 39734, 1242, 581, 1346, 509, 24372, 19441, 110, 72304, 121447, 23, 23936, 4, 1460, 2594, 25, 7, 5117, 54452, 111, 40418, 509, 70, 6957, 9, 199387, 15, 4369, 910, 19879, 16, 6, 95162, 10001, 156578, 44, 3957, 25706, 7, 111, 353, 31399, 86, 830, 23, 3129, 1919, 37195, 9, 669, 56101, 136, 160600, 75101, 31, 7175, 4, 3129, 2843, 96853, 6765, 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2965, 49726, 4, 14364, 4, 136, 49119, 20706, 4, 6, 69986, 100, 2965, 5361, 93425, 4, 12960, 99, 70, 43114, 162097, 54530, 442, 23742, 100, 11345, 46406, 9523, 10348, 5, 1650, 2843, 23742, 70, 8678, 95976, 100, 11345, 56101, 94831, 20706, 5, 48752, 289, 39329, 7, 4, 26719, 3980, 53, 110427, 15, 434, 497, 99, 836, 509, 8, 195, 297, 5792, 10332, 247, 14631, 3010, 191, 4, 136, 25031, 41656, 33, 15, 434, 497, 37170, 100, 5792, 5045, 17265, 247, 3542, 90698, 100, 1460, 2594, 25, 7, 105207, 31486, 8108, 1460, 2594, 509, 1274, 2822, 15, 257, 70, 5701, 27167, 450, 25031, 41656, 33, 1902, 37170, 100, 4, 1001, 10, 169209, 111, 70, 16530, 23179, 194, 133698, 1346, 214, 4, 1460, 2594, 2804, 70, 15824, 1919, 7175, 37202, 47, 8, 88981, 44, 2347, 64194, 30839, 187, 1176, 58, 51515, 297, 249, 30794, 4, 22339, 6238, 70, 4734, 3917, 47, 3249, 442, 4488, 509, 100, 756, 70, 51339, 1314, 47, 44, 20706, 2363, 31486, 7, 678, 28484, 158, 686, 10763, 1242, 31068, 821, 5, 19824, 170028, 1902, 47, 40197, 70, 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7, 4, 1460, 2594, 109133, 47, 113976, 4, 7440, 764, 6057, 2822, 23, 70, 7665, 9, 32832, 7, 44, 3957, 22928, 136, 70, 155438, 830, 75169, 58480, 138319, 5, 1529, 2843, 6057, 2822, 678, 114411, 42473, 6947, 4, 4939, 5174, 583, 60209, 4, 136, 73149, 31649, 65735, 23, 70, 113976, 1346, 44, 3957, 76639, 1974, 136, 581, 10074, 830, 1672, 7465, 7, 167790, 198952, 180, 25, 919, 1566, 56, 939, 4, 10, 2773, 9, 24804, 129574, 494, 525, 23, 70, 103302, 2750, 220845, 32502, 845, 19725, 136, 3789, 211190, 90, 16065, 1295, 70, 83572, 7, 20271, 6661, 5550, 1995, 5, 1460, 2594, 4, 3574, 206, 316, 4, 136, 6470, 7345, 3306, 756, 1902, 31486, 7, 23, 70, 12898, 456, 55898, 111, 44, 87926, 13, 138436, 830, 8951, 297, 390, 6470, 56532, 9927, 184, 5, 3164, 17262, 3542, 23, 70, 7311, 38576, 11389, 5, 360, 70, 456, 55898, 4, 1460, 2594, 112730, 9920, 36958, 53, 25, 7, 183093, 5, 18763, 4568, 197097, 1346, 31486, 2843, 21449, 23, 12898, 4, 23, 44, 670, 9319, 41021, 25, 7, 81669, 830, 8951, 297, 390, 111413, 845, 16196, 191, 136, 35509, 98, 70, 36541, 11301, 111, 450, 9351, 5, 1460, 2594, 112730, 10, 360, 40191, 4, 12960, 5941, 38436, 26366, 7, 3542, 8035, 22556, 12897, 71, 100, 21373, 69924, 4, 1460, 2594, 181141, 10, 31330, 8, 13158, 2852, 10, 13038, 992, 9, 127345, 42902, 31075, 148855, 145456, 111, 747, 17704, 60013, 64370, 23, 70, 1346, 53099, 5, 62, 6897, 9, 10617, 138235, 4, 1460, 2594, 509, 42459, 297, 23, 19340, 237, 10, 7722, 182017, 25469, 13, 47, 11675, 26548, 90062, 853, 35513, 100, 70, 23179, 111, 39897, 62493, 42, 5, 106073, 764, 14432, 36456, 3674, 450, 764, 1902, 110, 33946, 23, 8035, 10, 25469, 13, 66570, 100, 3835, 23179, 4, 1460, 2594, 65524, 71, 1632, 111, 1919, 775, 7, 4, 20731, 53, 1460, 2594, 4, 47, 11675, 100, 68894, 23179, 5, 20731, 53, 509, 8, 88981, 297, 15044, 20028, 390, 34264, 92142, 7, 23, 45712, 7, 23, 25695, 136, 15643, 26548, 131161, 345, 5, 294, 5, 130877, 4935, 25027, 25877, 4458, 4, 15700, 36770, 39329, 5, 1460, 2594, 122273, 297, 450, 36770, 34202, 54012, 4445, 59520, 1902, 30745, 4049, 450, 4, 1902, 764, 221, 46526, 456, 9, 1018, 10763, 23, 28015, 4, 764, 179140, 47, 18645, 1460, 2594, 70, 1305, 111, 345, 5, 294, 5, 72002, 7, 9601, 47, 122963, 46, 10, 1305, 1460, 2594, 4, 36, 14775, 47, 1919, 120552, 6, 7154, 38904, 4, 2804, 764, 13648, 5299, 765, 39958, 4, 54433, 4, 44, 1065, 23389, 268, 2806, 765, 2809, 10, 6782, 156578, 740, 360, 18374, 37719, 4, 1460, 2594, 139505, 21079, 4745, 9, 57332, 10255, 102, 1461, 155705, 5173, 1662, 1104, 16396, 247, 678, 136565, 764, 1902, 17262, 775, 7, 12, 86452, 15, 151210, 74668, 93815, 4, 56174, 15, 275, 5, 41906, 247, 136, 20731, 53, 10208, 15, 275, 5, 45604, 194, 10660, 3542, 168265, 71, 98, 14487, 48877, 47114, 5, 133698, 1919, 129570, 678, 10255, 102, 4, 1460, 2594, 1902, 10, 59335, 103086, 678, 44, 294, 117515, 99091, 58, 552, 9, 5613, 139302, 12439, 669, 5, 1529, 112017, 297, 70, 103086, 47, 58595, 2541, 22898, 111, 44, 243238, 58, 23, 10, 22059, 33683, 4, 54433, 12, 44, 43512, 87, 831, 5154, 83, 450, 87, 1902, 10, 2773, 5161, 100, 604, 15, 33189, 177, 669, 247, 136, 87, 5351, 450, 25, 7, 7440, 87, 36, 46526, 47, 7279, 27, 568, 509, 27150, 5, 4687, 509, 27150, 5, 1401, 3542, 75412, 100, 40859, 23, 20903, 136, 108938, 4488, 1242, 2161, 2356, 42552, 25, 7, 70077, 23, 47114, 4, 70, 5155, 7103, 1919, 168265, 509, 2704, 29367, 4, 1460, 2594, 139505, 36408, 516, 45602, 57212, 93, 5173, 6460, 1104, 10693, 247, 10, 7270, 7123, 105757, 2750, 1902, 33683, 297, 4049, 23, 50940, 8108, 764, 23409, 47, 98848, 47, 1346, 44, 158271, 62827, 740, 1529, 37170, 604, 47, 40781, 37195, 21775, 14432, 4, 136, 1836, 100512, 23, 184, 2500, 2886, 5, 10660, 1902, 10, 775, 4, 94825, 1460, 2594, 15, 275, 5, 36327, 247, 136, 10, 76849, 4, 203986, 1460, 2594, 15, 275, 5, 2161, 18237, 427, 4, 88847, 1460, 2594, 68, 71, 23, 1919, 60268, 1295, 22508, 82335, 50901, 59248, 99, 70, 32070, 111, 18825, 99, 1919, 5368, 23, 3731, 31754, 5, 18763, 58386, 4, 1446, 31, 45602, 4, 509, 390, 1919, 5609, 5, 139256, 53, 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summarize: The first classification of birds was developed by Francis Willughby and John Ray in their 1676 volume "Ornithologiae". Carl Linnaeus modified that work in 1758 to devise the taxonomic classification system currently in use. Birds are categorised as the biological class Aves in Linnaean taxonomy. Phylogenetic taxonomy places Aves in the dinosaur clade Theropoda. Aves and a sister group, the order Crocodilia, contain the only living representatives of the reptile clade Archosauria. During the late 1990s, Aves was most commonly defined phylogenetically as all descendants of the most recent common ancestor of modern birds and "Archaeopteryx lithographica". However, an earlier definition proposed by Jacques Gauthier gained wide currency in the 21st century, and is used by many scientists including adherents of the Phylocode system. Gauthier defined Aves to include only the crown group of the set of modern birds. This was done by excluding most groups known only from fossils, and assigning them, instead, to the broader group Avialae, in part to avoid the uncertainties about the placement of "Archaeopteryx" in relation to animals traditionally thought of as theropod dinosaurs. Gauthier and de Queiroz identified four different definitions for the same biological name "Aves", which is a problem. The authors proposed to reserve the term Aves only for the crown group consisting of the last common ancestor of all living birds and all of its Based on fossil and biological evidence, most scientists accept that birds are a specialised subgroup of theropod dinosaurs, and more specifically, they are members of Maniraptora, a group of theropods which includes dromaeosaurids and oviraptorosaurs, among others. As scientists have discovered more theropods closely related to birds, the previously clear distinction between non-birds and birds has become blurred. Recent discoveries in the Liaoning Province of northeast China, which demonstrate many small theropod feathered dinosaurs, contribute to this ambiguity. The consensus view in contemporary palaeontology is that the flying theropods, or avialans, are the closest relatives of the deinonychosaurs, which include dromaeosaurids and troodontids. Over 40% of key traits found in modern birds evolved during the 60 million year transition from the earliest bird-line archosaurs to the first maniraptoromorphs, i.e. the first dinosaurs closer to living birds than to "Tyrannosaurus rex". The loss of osteoderms otherwise common in archosaurs and acquisition of primitive feathers might have occurred early during this phase. After the appearance of Maniraptoromorpha, the next 40 million years marked a continuous reduction of body size and the accumulation of neotenic (juvenile-like) characteristics. Hypercarnivory became increasingly less common while braincases enlarged and forelimbs became longer. The integument evolved into complex, pennaceous feathers. The oldest known paravian (and probably the earliest avialan) fossils come from the Tiaojishan Formation of China, which has been dated to the late Jurassic period (Oxfordian stage), about 160 million years ago. The avialan species from this time period include "Anchiornis huxleyi", "Xiaotingia zhengi", and "Aurornis xui". The well-known probable early avialan, "Archaeopteryx", dates from slightly The first large, diverse lineage of short-tailed avialans to evolve were the Enantiornithes, or "opposite birds", so named because the construction of their shoulder bones was in reverse to that of modern birds. Enantiornithes occupied a wide array of ecological niches, from sand-probing shorebirds and fish-eaters to tree-dwelling forms and seed-eaters. While they were the dominant group of avialans during the Cretaceous period, enantiornithes became extinct along with many other dinosaur groups at the end of the Mesozoic era. Many species of the second major avialan lineage to diversify, the Euornithes (meaning "true birds", because they include the ancestors of modern birds), were semi-aquatic and specialised in eating fish and other small aquatic organisms. Unlike the Enantiornithes, which dominated land-based and arboreal habitats, All modern birds lie within the crown group Aves (alternately Neornithes), which has two subdivisions: the Palaeognathae, which includes the flightless ratites (such as the ostriches) and the weak-flying tinamous, and the extremely diverse Neognathae, containing all other birds. These two subdivisions are often given the rank of superorder, although Livezey and Zusi assigned them "cohort" rank. Depending on the taxonomic viewpoint, the number of known living bird species varies anywhere from 9,800 to 10,758. The discovery of "Vegavis", a late Cretaceous member of the Anatidae, proved that the diversification of modern birds started before the Cenozoic era. The affinities of an earlier fossil, the possible galliform "Austinornis Cladogram of modern bird relationships based on Prum, R.O. "et al". (2015) with some clade names after Yuri, T. et al. (2013). The classification of birds is a contentious issue. Sibley and Ahlquist's "Phylogeny and Classification of Birds" (1990) is a landmark work on the classification of Birds live and breed in most terrestrial habitats and on all seven continents, reaching their southern extreme in the snow petrel's breeding colonies up to inland in Antarctica. The highest bird diversity occurs in tropical regions. It was earlier thought that this high diversity was the result of higher speciation rates in the tropics; however recent studies found higher speciation rates in the high latitudes that were offset by greater extinction rates than in the tropics. Many species migrate annually over great distances Compared with other vertebrates, birds have a body plan that shows many unusual adaptations, mostly to facilitate flight. The skeleton consists of very lightweight bones. They have large air-filled cavities (called pneumatic cavities) which connect with the respiratory system. The skull bones in adults are fused and do not show cranial sutures. The orbits are large and separated by a bony septum. The spine has cervical, thoracic, lumbar and caudal regions with the number of cervical Like the reptiles, birds are primarily uricotelic, that is, their kidneys extract nitrogenous waste from their bloodstream and excrete it as uric acid, instead of urea or ammonia, through the ureters into the intestine. Birds do not have a urinary bladder or external urethral opening and (with exception of the ostrich) uric acid is Males within Palaeognathae (with the exception of the kiwis), the Anseriformes (with the exception of screamers), and in rudimentary forms in Galliformes (but fully developed in Cracidae) possess a penis, which is never present in Neoaves. The length is thought to be related to sperm competition. When not copulating, it is hidden within the proctodeum compartment within the cloaca, just inside the vent. Female birds have sperm storage tubules that allow sperm to remain viable long after copulation, a hundred days in some species. Sperm from multiple males may compete through this mechanism. Most female birds have a single ovary and a single oviduct, both on the left side, but there are exceptions: species in at least 16 different orders of birds have two ovaries. Even these species, however, tend to have a single oviduct. It has Birds have one of the most complex respiratory systems of all animal groups. Upon inhalation, 75% of the fresh air bypasses the lungs and flows directly into a posterior air sac which extends from the lungs and connects with air spaces in the bones and fills them with air. The other 25% of the air goes directly into the lungs. When the bird exhales, the used air flows out of the lungs and the stored fresh air from the posterior air sac is The avian circulatory system is driven by a four-chambered, myogenic heart contained in a fibrous pericardial sac. This pericardial sac is filled with a serous fluid for lubrication. The heart itself is divided into a right and left half, each with an atrium and ventricle. The atrium and ventricles of each side are separated by atrioventricular valves which prevent back flow from one chamber to the next during contraction. Being myogenic, the heart's pace is maintained by pacemaker cells found in the Birds have a very efficient system for diffusing oxygen into the blood; birds have a ten times greater surface area to gas exchange volume than mammals. As a result, birds have more blood in their capillaries per unit of volume of lung than a mammal. The arteries are composed of thick elastic muscles to withstand the pressure of the ventricular contractions, and become more rigid as they move away from the heart. Blood moves through the arteries, which undergo vasoconstriction, and into arterioles which act as a transportation system to distribute primarily oxygen as well as nutrients to all tissues of the body. As the arterioles move away from the heart and into individual organs and The nervous system is large relative to the bird's size. The most developed part of the brain is the one that controls the flight-related functions, while the cerebellum coordinates movement and the cerebrum controls behaviour patterns, navigation, mating and nest building. Most birds have a poor sense of smell with notable exceptions including kiwis, New World vultures and tubenoses. The avian visual system is usually highly developed. Water birds have special flexible lenses, allowing accommodation for vision in air and water. Some species also have dual fovea. Birds are tetrachromatic, possessing ultraviolet (UV) sensitive cone cells in the eye as well as green, red and blue ones. They also have double cones, likely to mediate achromatic vision. Many birds show plumage patterns in ultraviolet that are invisible to the human eye; some birds whose sexes appear similar to the naked eye are distinguished by the A few species are able to use chemical defences against predators; some Procellariiformes can eject an unpleasant stomach oil against an aggressor, and some species of pitohuis from New Guinea have a powerful neurotoxin in their skin and feathers. A lack of field observations limit our knowledge, but intraspecific conflicts are known to sometimes result in injury or death. The screamers (Anhimidae), some jacanas ("Jacana", "Hydrophasianus"), the spur-winged goose Feathers are a feature characteristic of birds (though also present in some dinosaurs not currently considered to be true birds). They facilitate flight, provide insulation that aids in thermoregulation, and are used in display, camouflage, and signalling. There are several types of feathers, each serving its own set of purposes. Feathers are epidermal growths attached to the skin and arise only in specific tracts of skin called pterylae. The distribution pattern of these feather tracts (pterylosis) is used in taxonomy and systematics. The arrangement and appearance Most birds can fly, which distinguishes them from almost all other vertebrate classes. Flight is the primary means of locomotion for most bird species and is used for searching for food and for escaping from predators. Birds have various adaptations for flight, including a lightweight skeleton, two large flight muscles, the pectoralis (which accounts for 15% of the total mass of the Most birds are diurnal, but some birds, such as many species of owls and nightjars, are nocturnal or crepuscular (active during twilight hours), and many coastal waders feed when the tides are appropriate, by day or night. are varied and often include nectar, fruit, plants, seeds, carrion, and various small animals, including other birds. The digestive system of birds is unique, with a crop for storage and a gizzard that contains swallowed stones for grinding food to compensate for the lack of teeth. Most birds are highly adapted for rapid digestion to aid with flight. Some migratory birds have adapted to use protein stored in many parts of their bodies, including protein from the intestines, as additional energy during migration. Birds that employ many strategies to obtain food or feed on a variety of food items are called generalists, while others that concentrate time and effort on specific food items or have a single strategy to obtain food are considered specialists. Avian foraging strategies can vary widely by species. Many birds glean for insects, invertebrates, fruit, or seeds. Some hunt insects by suddenly attacking Water is needed by many birds although their mode of excretion and lack of sweat glands reduces the physiological demands. Some desert birds can obtain their water needs entirely from moisture in their food. They may also have other adaptations such as allowing their body temperature to rise, saving on moisture loss from evaporative cooling or panting. Seabirds can drink seawater and have salt glands inside the head that eliminate excess salt out of the nostrils. Most birds scoop Feathers, being critical to the survival of a bird, require maintenance. Apart from physical wear and tear, feathers face the onslaught of fungi, ectoparasitic feather mites and bird lice. The physical condition of feathers are maintained by often with the application of secretions from the. Birds also bathe in water or dust themselves. While some birds dip into shallow water, more Many bird species migrate to take advantage of global differences of seasonal temperatures, therefore optimising availability of food sources and breeding habitat. These migrations vary among the different groups. Many landbirds, shorebirds, and waterbirds undertake annual long-distance migrations, usually triggered by the length of daylight as well as weather conditions. These birds are characterised by a breeding season spent in the temperate or polar regions and a non-breeding season in the tropical regions or opposite hemisphere. Before migration, birds substantially increase body fats and reserves and reduce the size Birds communicate using primarily visual and auditory signals. Signals can be interspecific (between species) and intraspecific (within species). Birds sometimes use plumage to assess and assert social dominance, to display breeding condition in sexually selected species, or to make threatening displays, as in the sunbittern's mimicry of a large predator to ward off hawks and protect young chicks. Variation in plumage also allows for the identification of birds, particularly between species. Visual communication among birds may also involve ritualised displays, which have developed from non-signalling actions such as preening, the adjustments of feather position, pecking, or other behaviour. These displays may signal aggression or submission or may contribute to the formation of pair-bonds. The While some birds are essentially territorial or live in small family groups, other birds may form large flocks. The principal benefits of flocking are safety in numbers and increased foraging efficiency. Defence against predators is particularly important in closed habitats like forests, where ambush predation is common and multiple eyes can provide a valuable early warning system. This has led to the development of The high metabolic rates of birds during the active part of the day is supplemented by rest at other times. Sleeping birds often use a type of sleep known as vigilant sleep, where periods of rest are interspersed with quick eye-opening "peeks", allowing them to be sensitive to disturbances and enable rapid escape from threats. Swifts are believed to be able to sleep in flight and radar observations suggest that they orient themselves to face the wind in their roosting flight. It has been suggested that there may be certain kinds of sleep which are possible even when in flight. Some birds have also demonstrated the capacity to fall into slow-wave sleep one hemisphere of the brain at a time. The birds tend to exercise this ability depending upon its position relative to the outside of the flock. This may allow the eye opposite the Ninety-five per cent of bird species are socially monogamous. These species pair for at least the length of the breeding season or—in some cases—for several years or until the death of one mate. Monogamy allows for both paternal care and biparental care, which is especially important for species in which females require males' assistance for successful brood-rearing. Among many socially monogamous species, extra-pair copulation (infidelity) is common. Such behaviour typically occurs between dominant males and females paired with subordinate males, but may also be the result of forced copulation in ducks and other anatids. For females, possible benefits of extra-pair copulation include getting better genes for her offspring and insuring against the possibility of infertility in her mate. Males of species that engage in extra-pair copulations will closely guard their mates to ensure Many birds actively defend a territory from others of the same species during the breeding season; maintenance of territories protects the food source for their chicks. Species that are unable to defend feeding territories, such as seabirds and swifts, often breed in colonies instead; this is thought to offer protection from predators. Colonial breeders defend small nesting sites, and competition between and within species for nesting sites can be intense. All birds lay amniotic eggs with hard shells made mostly of calcium carbonate. Hole and burrow nesting species tend to lay white or pale eggs, while open nesters lay camouflaged eggs. There are many exceptions to this pattern, however; the ground-nesting nightjars have pale eggs, and camouflage is instead provided by their plumage. Species that are victims of brood parasites have varying egg colours to improve the chances of spotting a parasite's egg, which forces female parasites to match their eggs to those of their hosts. Bird eggs are usually laid in a nest. Most species create somewhat elaborate nests, which can be cups, At the time of their hatching, chicks range in development from helpless to independent, depending on their species. Helpless chicks are termed "altricial", and tend to be born small, blind, immobile and naked; chicks that are mobile and feathered upon hatching are termed "precocial". Altricial chicks need help thermoregulating and must be brooded for longer than precocial chicks. The young of many bird species do not precisely fit into either the precocial or altricial category, having some aspects of each and thus fall somewhere on an "altricial-precocial spectrum". Chicks at neither extreme but favoring one or the other may be termed or. The length and nature of parental care varies widely amongst different orders and species. At one extreme, parental care in megapodes ends at hatching; the newly hatched chick digs itself out of the nest mound without parental assistance and can fend for itself immediately. At the other extreme, many seabirds have extended periods of parental care, the longest being that of the great frigatebird, whose chicks take up to six months to fledge and are fed by the parents for up to an additional 14 months. The "chick guard stage" describes the Brood parasitism, in which an egg-layer leaves her eggs with another individual's brood, is more common among birds than any other type of organism. After a parasitic bird lays her eggs in another bird's nest, they are often accepted and raised by the host at the expense of the host's own brood. Brood parasites may be either "obligate brood parasites", which must lay their eggs in the nests of other Birds have evolved a variety of mating behaviours, with the peacock tail being perhaps the most famous example of sexual selection and the Fisherian runaway. Commonly occurring sexual dimorphisms such as size and colour differences are energetically costly attributes that signal competitive breeding situations. Many types of avian sexual selection have been identified; intersexual selection, also known Inbreeding causes early death (inbreeding depression) in the zebra finch "Taeniopygia guttata". Embryo survival (that is, hatching success of fertile eggs) was significantly lower Incestuous matings by the purple-crowned fairy wren "Malurus coronatus" result in severe fitness costs due to inbreeding depression (greater than 30% reduction in hatchability of eggs). Females paired with related males may undertake extra pair matings (see Promiscuity#Other animals for 90% frequency in avian species) that can reduce the negative effects of inbreeding. However, there are ecological and demographic constraints on extra pair matings. Nevertheless, 43% of broods produced by incestuously paired females contained extra pair young. Inbreeding depression occurs in the great tit ("Parus major") when the offspring produced as a result of a mating between close relatives show reduced fitness. In natural populations of "Parus major", inbreeding is avoided by Birds occupy a wide range of ecological positions. While some birds are generalists, others are highly specialised in their habitat or food requirements. Even within a single habitat, such as a forest, the niches occupied by different species of birds vary, with some species feeding in the forest canopy, others beneath the canopy, and still others on the forest floor. Forest birds may be insectivores, frugivores, and nectarivores. Aquatic birds generally feed by fishing, plant eating, and piracy or kleptoparasitism. Birds of prey specialise in hunting mammals or other birds, while vultures are specialised scavengers. Avivores are animals that are specialised at preying on birds. Since birds are highly visible and common animals, humans have had a relationship with them since the dawn of man. Sometimes, these relationships are mutualistic, like the cooperative honey-gathering among honeyguides and African peoples such as the Borana. Other times, they may be commensal, as when species such as the house sparrow have benefited from human activities. Several bird species have become commercially significant agricultural pests, and some pose an aviation hazard. Human activities can also be detrimental, and have threatened numerous bird species with extinction (hunting, avian lead poisoning, pesticides, roadkill, wind turbine kills and predation by pet cats and dogs are common causes of death for birds). Birds can act as vectors for spreading diseases such as psittacosis, salmonellosis, campylobacteriosis, mycobacteriosis (avian tuberculosis), avian influenza (bird flu), giardiasis, and cryptosporidiosis over long distances. Some of these are zoonotic diseases that can also be transmitted to humans. Domesticated birds raised for meat and eggs, called poultry, are the largest source of animal protein eaten by humans; in 2003, tons of poultry and tons of eggs were produced worldwide. Chickens account for much of human poultry consumption, though domesticated turkeys, ducks, and geese are also relatively common. Many species of birds are also hunted for meat. Bird hunting is primarily a recreational activity except in extremely undeveloped areas. The most important birds hunted in North and South America are waterfowl; other widely hunted birds include pheasants, wild turkeys, quail, doves, partridge, grouse, snipe, and woodcock. Muttonbirding is also popular in Australia and New Zealand. Although some hunting, such as that of muttonbirds, may be sustainable, hunting has led to the extinction or endangerment of dozens of species. Other commercially Birds play prominent and diverse roles in religion and mythology. In religion, birds may serve as either messengers or priests and leaders for a deity, such as in the Cult of Makemake, in which the Tangata manu of Easter Island served as chiefs or as attendants, as in the case of Hugin and Munin, the two common ravens who whispered news into the ears of the Norse god Odin. In several civilisations of ancient Italy, particularly Etruscan and Roman religion, priests were involved in augury, or interpreting the words of birds while the "auspex" (from which the word "auspicious" Birds have featured in culture and art since prehistoric times, when they were represented in early cave paintings. Some birds have been perceived as monsters, including the mythological Roc and the Māori's legendary, a giant bird capable of snatching humans. Birds were later used as symbols of power, as in the magnificent Peacock Throne of the Mughal and Persian emperors. With the advent of scientific interest in birds, many paintings of birds were commissioned for books. Among the most famous of these bird artists was John James Audubon, whose paintings of North American birds were a great commercial success in Europe and who later lent In music, birdsong has influenced composers and musicians in several ways: they can be inspired by birdsong; they can intentionally imitate bird song in a Although human activities have allowed the expansion of a few species, such as the barn swallow and European starling, they have caused population decreases or extinction in many other species. Over a hundred bird species have gone extinct in historical times, although the most dramatic human-caused avian extinctions, eradicating an estimated 750–1800 species, occurred during the human colonisation of Melanesian, Polynesian, and Micronesian islands. Many bird populations are declining worldwide, with 1,227 species listed as
Birds are a group of warm-blooded vertebrates constituting the class Aves, characterized by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the bee hummingbird to the ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. Birds have whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming.
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summarize: The relation of the distance of objects in free fall to the square of the time taken had recently been confirmed by Grimaldi and Riccioli between 1640 and 1650. They had also made a calculation of the gravitational constant by recording the oscillations of a pendulum. A modern assessment about the early history of the inverse square law is that "by the late 1670s", the assumption of an "inverse proportion between gravity and the square of distance was rather common and had been advanced by a number of different people for different reasons". The same author credits Robert Hooke with a significant and seminal contribution, but treats Hooke's claim of priority on the inverse square point as irrelevant, as several individuals besides Newton and Hooke had suggested it. He points instead to the idea of "compounding the celestial motions" and the conversion of Newton's thinking away from "centrifugal" and towards "centripetal" force as Hooke's significant contributions. Newton gave credit in his "Principia" to two people: Bullialdus (who wrote without proof that there was a force on the Earth towards the Sun), and Borelli (who wrote that all planets were attracted towards the Sun). The main influence may have been Borelli, whose book Newton had a copy of. In 1686, when the first book of Newton's "Principia" was presented to the Royal Society, Robert Hooke accused Newton of plagiarism by claiming that he had taken from him the "notion" of "the rule of the decrease of Gravity, being reciprocally as the squares of the distances from the Center". At the same time (according to Edmond Halley's contemporary report) Hooke agreed that "the Demonstration of the Curves generated thereby" was wholly Newton's. In this way, the question arose as to what, if anything, Newton owed to Hooke. This is a subject extensively discussed since that time and on which some points, outlined below, continue to excite controversy. Robert Hooke published his ideas about the "System of the World" in the 1660s, when he read to the Royal Society on March 21, 1666, a paper "concerning the inflection of a direct motion into a curve by a supervening attractive principle", and he published them again in somewhat developed form in 1674, as an addition to "An Attempt to Prove the Motion of the Earth from Observations". Hooke announced in 1674 that he planned to "explain a System of the World differing in many particulars from any yet known", based on three suppositions: that "all Celestial Bodies whatsoever, have an attraction or gravitating power towards their own Centers" and "also attract all the other Celestial Bodies that are within the sphere of their activity"; that "all bodies whatsoever that are put into a direct and simple motion, will so continue to move forward in a straight line, till they are by some other effectual powers deflected and bent..." and that "these attractive powers are so much the more powerful in operating, by how much the nearer the body wrought upon is to their own Centers". Thus Hooke postulated mutual attractions between the Sun and planets, in a way that increased with nearness to the attracting body, together with a principle of linear inertia. Hooke's statements up to 1674 made no mention, however, that an inverse square law applies or might apply to these attractions. Hooke's gravitation was also not yet universal, though it approached universality more closely than previous hypotheses. He also did not provide accompanying evidence or mathematical demonstration. On the latter two aspects, Hooke himself stated in 1674: "Now what these several degrees [of attraction] are I have not yet experimentally verified"; and as to his whole proposal: "This I only hint at present", "having my self many other things in hand which I would first compleat, and therefore cannot so well attend it" (i.e. "prosecuting this Inquiry"). It was later on, in writing on 6 January 1679|80 to Newton, that Hooke communicated his "supposition... that the Attraction always is in a duplicate proportion to the Distance from the Center Reciprocall, and Consequently that the Velocity will be in a subduplicate proportion to the Attraction and Consequently as Kepler Supposes Reciprocall to the Distance." (The inference about the velocity was incorrect.) Hooke's correspondence with Newton during 1679–1680 not only mentioned this inverse square supposition for the decline of attraction with increasing distance, but also, in Hooke's opening letter to Newton, of 24 November 1679, an approach of "compounding the celestial motions of the planets of a direct motion by the tangent & an attractive motion towards the central body". Newton, faced in May 1686 with Hooke's claim on the inverse square law, denied that Hooke was to be credited as author of the idea. Among the reasons, Newton recalled that the idea had been discussed with Sir Christopher Wren previous to Hooke's 1679 letter. Newton also pointed out and acknowledged prior work of others, including Bullialdus, (who suggested, but without demonstration, that there was an attractive force from the Sun in the inverse square proportion to the distance), and Borelli (who suggested, also without demonstration, that there was a centrifugal tendency in counterbalance with a gravitational attraction towards the Sun so as to make the planets move in ellipses). D T Whiteside has described the contribution to Newton's thinking that came from Borelli's book, a copy of which was in Newton's library at his death. Newton further defended his work by saying that had he first heard of the inverse square proportion from Hooke, he would still have some rights to it in view of his demonstrations of its accuracy. Hooke, without evidence in favor of the supposition, could only guess that the inverse square law was approximately valid at great distances from the center. According to Newton, while the 'Principia' was still at pre-publication stage, there were so many a priori reasons to doubt the accuracy of the inverse-square law (especially close to an attracting sphere) that "without my (Newton's) Demonstrations, to which Mr Hooke is yet a stranger, it cannot believed by a judicious Philosopher to be any where accurate." This remark refers among other things to Newton's finding, supported by mathematical demonstration, that if the inverse square law applies to tiny particles, then even a large spherically symmetrical mass also attracts masses external to its surface, even close up, exactly as if all its own mass were concentrated at its center. Thus Newton gave a justification, otherwise lacking, for applying the inverse square law to large spherical planetary masses as if they were tiny particles. In addition, Newton had formulated, in Propositions 43–45 of Book 1 and associated sections of Book 3, a sensitive test of the accuracy of the inverse square law, in which he showed that only where the law of force is calculated as the inverse square of the distance will the directions of orientation of the planets' orbital ellipses stay constant as they are observed to do apart from small effects attributable to inter-planetary perturbations. In regard to evidence that still survives of the earlier history, manuscripts written by Newton in the 1660s show that Newton himself had, by 1669, arrived at proofs that in a circular case of planetary motion, "endeavour to recede" (what was later called centrifugal force) had an inverse-square relation with distance from the center. After his 1679–1680 correspondence with Hooke, Newton adopted the language of inward or centripetal force. According to Newton scholar J. Bruce Brackenridge, although much has been made of the change in language and difference of point of view, as between centrifugal or centripetal forces, the actual computations and proofs remained the same either way. They also involved the combination of tangential and radial displacements, which Newton was making in the 1660s. The lesson offered by Hooke to Newton here, although significant, was one of perspective and did not change the analysis. This background shows there was basis for Newton to deny deriving the inverse square law from Hooke. On the other hand, Newton did accept and acknowledge, in all editions of the "Principia", that Hooke (but not exclusively Hooke) had separately appreciated the inverse square law in the solar system. Newton acknowledged Wren, Hooke, and Halley in this connection in the Scholium to Proposition 4 in Book 1. Newton also acknowledged to Halley that his correspondence with Hooke in 1679–80 had reawakened his dormant interest in astronomical matters, but that did not mean, according to Newton, that Hooke had told Newton anything new or original: "yet am I not beholden to him for any light into that business but only for the diversion he gave me from my other studies to think on these things & for his dogmaticalness in writing as if he had found the motion in the Ellipsis, which inclined me to try it..." Since the time of Newton and Hooke, scholarly discussion has also touched on the question of whether Hooke's 1679 mention of 'compounding the motions' provided Newton with something new and valuable, even though that was not a claim actually voiced by Hooke at the time. As described above, Newton's manuscripts of the 1660s do show him actually combining tangential motion with the effects of radially directed force or endeavour, for example in his derivation of the inverse square relation for the circular case. They also show Newton clearly expressing the concept of linear inertia—for which he was indebted to Descartes' work, published in 1644 (as Hooke probably was). These matters do not appear to have been learned by Newton from Hooke. Nevertheless, a number of authors have had more to say about what Newton gained from Hooke and some aspects remain controversial. The fact that most of Hooke's private papers had been destroyed or have disappeared does not help to establish the truth. Newton's role in relation to the inverse square law was not as it has sometimes been represented. He did not claim to think it up as a bare idea. What Newton did was to show how the inverse-square law of attraction had many necessary mathematical connections with observable features of the motions of bodies in the solar system; and that they were related in such a way that the observational evidence and the mathematical demonstrations, taken together, gave reason to believe that the inverse square law was not just approximately true but exactly true (to the accuracy achievable in Newton's time and for about two centuries afterwards – and with some loose ends of points that could not yet be certainly examined, where the implications of the theory had not yet been adequately identified or calculated). About thirty years after Newton's death in 1727, Alexis Clairaut, a mathematical astronomer eminent in his own right in the field of gravitational studies, wrote after reviewing what Hooke published, that "One must not think that this idea... of Hooke diminishes Newton's glory"; and that "the example of Hooke" serves "to show what a distance there is between a truth that is glimpsed and a truth that is demonstrated". While Newton was able to formulate his law of gravity in his monumental work, he was deeply uncomfortable with the notion of "action at a distance" that his equations implied. In 1692, in his third letter to Bentley, he wrote: ""That one body may act upon another at a distance through a vacuum without the mediation of anything else, by and through which their action and force may be conveyed from one another, is to me so great an absurdity that, I believe, no man who has in philosophic matters a competent faculty of thinking could ever fall into it."" He never, in his words, "assigned the cause of this power". In all other cases, he used the phenomenon of motion to explain the origin of various forces acting on bodies, but in the case of gravity, he was unable to experimentally identify the motion that produces the force of gravity (although he invented two mechanical hypotheses in 1675 and 1717). Moreover, he refused to even offer a hypothesis as to the cause of this force on grounds that to do so was contrary to sound science. He lamented that "philosophers have hitherto attempted the search of nature in vain" for the source of the gravitational force, as he was convinced "by many reasons" that there were "causes hitherto unknown" that were fundamental to all the "phenomena of nature". These fundamental phenomena are still under investigation and, though hypotheses abound, the definitive answer has yet to be found. And in Newton's 1713 "General Scholium" in the second edition of "Principia": ""I have not yet been able to discover the cause of these properties of gravity from phenomena and I feign no hypotheses... It is enough that gravity does really exist and acts according to the laws I have explained, and that it abundantly serves to account for all the motions of celestial bodies."" In modern language, the law states the following: Assuming SI units, "F" is measured in newtons (N), "m" and "m" in kilograms (kg), "r" in meters (m), and the constant "G" is The value of the constant "G" was first accurately determined from the results of the Cavendish experiment conducted by the British scientist Henry Cavendish in 1798, although Cavendish did not himself calculate a numerical value for "G". This experiment was also the first test of Newton's theory of gravitation between masses in the laboratory. It took place 111 years after the publication of Newton's "Principia" and 71 years after Newton's death, so none of Newton's calculations could use the value of "G"; instead he could only calculate a force relative to another force. If the bodies in question have spatial extent (as opposed to being point masses), then the gravitational force between them is calculated by summing the contributions of the notional point masses that constitute the bodies. In the limit, as the component point masses become "infinitely small", this entails integrating the force (in vector form, see below) over the extents of the two bodies. In this way, it can be shown that an object with a spherically symmetric distribution of mass exerts the same gravitational attraction on external bodies as if all the object's mass were concentrated at a point at its center. (This is not generally true for non-spherically-symmetrical bodies.) For points "inside" a spherically symmetric distribution of matter, Newton's shell theorem can be used to find the gravitational force. The theorem tells us how different parts of the mass distribution affect the gravitational force measured at a point located a distance "r" from the center of the mass distribution: As a consequence, for example, within a shell of uniform thickness and density there is "no net" gravitational acceleration anywhere within the hollow sphere. Furthermore, inside a uniform sphere the gravity increases linearly with the distance from the center; the increase due to the additional mass is 1.5 times the decrease due to the larger distance from the center. Thus, if a spherically symmetric body has a uniform core and a uniform mantle with a density that is less than 2/3 of that of the core, then the gravity initially decreases outwardly beyond the boundary, and if the sphere is large enough, further outward the gravity increases again, and eventually it exceeds the gravity at the core/mantle boundary. The gravity of the Earth may be highest at the core/mantle boundary. Newton's law of universal gravitation can be written as a vector equation to account for the direction of the gravitational force as well as its magnitude. In this formula, quantities in bold represent vectors. where It can be seen that the vector form of the equation is the same as the scalar form given earlier, except that F is now a vector quantity, and the right hand side is multiplied by the appropriate unit vector. Also, it can be seen that F = −F. The gravitational field is a vector field that describes the gravitational force that would be applied on an object in any given point in space, per unit mass. It is actually equal to the gravitational acceleration at that point. It is a generalisation of the vector form, which becomes particularly useful if more than two objects are involved (such as a rocket between the Earth and the Moon). For two objects (e.g. object 2 is a rocket, object 1 the Earth), we simply write r instead of r and "m" instead of "m" and define the gravitational field g(r) as: so that we can write: This formulation is dependent on the objects causing the field. The field has units of acceleration; in SI, this is m/s. Gravitational fields are also conservative; that is, the work done by gravity from one position to another is path-independent. This has the consequence that there exists a gravitational potential field "V"(r) such that If "m" is a point mass or the mass of a sphere with homogeneous mass distribution, the force field g(r) outside the sphere is isotropic, i.e., depends only on the distance "r" from the center of the sphere. In that case the gravitational field is on, inside and outside of symmetric masses. As per Gauss's law, field in a symmetric body can be found by the mathematical equation: where formula_8 is a closed surface and formula_9 is the mass enclosed by the surface. Hence, for a hollow sphere of radius formula_10 and total mass formula_11, For a uniform solid sphere of radius formula_10 and total mass formula_11, Newton's description of gravity is sufficiently accurate for many practical purposes and is therefore widely used. Deviations from it are small when the dimensionless quantities formula_16 and formula_17 are both much less than one, where formula_18 is the gravitational potential, formula_19 is the velocity of the objects being studied, and formula_20 is the speed of light in vacuum. For example, Newtonian gravity provides an accurate description of the Earth/Sun system, since where formula_22 is the radius of the Earth's orbit around the Sun. In situations where either dimensionless parameter is large, then general relativity must be used to describe the system. General relativity reduces to Newtonian gravity in the limit of small potential and low velocities, so Newton's law of gravitation is often said to be the low-gravity limit of general relativity. The first two conflicts with observations above were explained by Einstein's theory of general relativity, in which gravitation is an manifestation of curved spacetime instead of being due to a force propagated between bodies. In Einstein's theory, energy and momentum distort spacetime in their vicinity, and other particles move in trajectories determined by the geometry of spacetime. This allowed a description of the motions of light and mass that was consistent with all available observations. In general relativity, the gravitational force is a fictitious force resulting from to the curvature of spacetime, because the gravitational acceleration of a body in free fall is due to its world line being a geodesic of spacetime. Newton was the first to consider in his "Principia" an extended expression of his law of gravity including an inverse-cube term of the form attempting to explain the Moon's apsidal motion. Other extensions were proposed by Laplace (around 1790) and Decombes (1913): In recent years, quests for non-inverse square terms in the law of gravity have been carried out by neutron interferometry. The "n"-body problem is an ancient, classical problem of predicting the individual motions of a group of celestial objects interacting with each other gravitationally. Solving this problem — from the time of the Greeks and on — has been motivated by the desire to understand the motions of the Sun, planets and the visible stars. In the 20th century, understanding the dynamics of globular cluster star systems became an important "n"-body problem too. The "n"-body problem in general relativity is considerably more difficult to solve. The classical physical problem can be informally stated as: "given the quasi-steady orbital properties" ("instantaneous position, velocity and time") "of a group of celestial bodies, predict their interactive forces; and consequently, predict their true orbital motions for all future times". The two-body problem has been completely solved, as has the restricted three-body problem.
Newton's law of universal gravitation is usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The publication of the theory has become known as the "first great unification", as it marked the unification of the previously described phenomena of gravity on Earth with known astronomical behaviors.
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summarize: Most land vehicles use wheels and therefore rolling for. Slip should be kept to a minimum (approximating pure rolling), otherwise loss of control and an accident may result. This may happen when the road is covered in snow, sand, or oil, when taking a turn at high speed or attempting to brake or accelerate suddenly. One of the most practical applications of rolling objects is the use of rolling-element bearings, such as ball bearings, in rotating devices. Made of metal, the rolling elements are usually encased between two rings that can rotate independently of each other. In most mechanisms, the inner ring is attached to a stationary shaft (or axle). Thus, while the inner ring is stationary, the outer ring is free to move with very little friction. This is the basis for which almost all motors (such as those found in ceiling fans, cars, drills, etc.) rely on to operate. The amount of friction on the mechanism's parts depends on the quality of the ball bearings and how much lubrication is in the mechanism. Rolling objects are also frequently used as tools for transportation. One of the most basic ways is by placing a (usually flat) object on a series of lined-up rollers, or wheels. The object on the wheels can be moved along them in a straight line, as long as the wheels are continuously replaced in the front (see history of bearings). This method of primitive transportation is efficient when no other machinery is available. Today, the most practical application of objects on wheels are cars, trains, and other human transportation vehicles. The simplest case of rolling is that of rolling without slipping along a flat surface with its axis parallel to the surface (or equivalently: perpendicular to the surface normal). The trajectory of any point is a trochoid; in particular, the trajectory of any point in the object axis is a line, while the trajectory of any point in the object rim is a cycloid. The velocity of any point in the rolling object is given by formula_1, where formula_2 is the displacement between the particle and the rolling object's contact point (or line) with the surface, and formula_3 is the angular velocity vector. Thus, despite that rolling is different from rotation around a fixed axis, the "instantaneous velocity" of all particles of the rolling object is the same as if it was rotating around an axis that passes through the point of contact with the same angular velocity. Any point in the rolling object farther from the axis than the point of contact will temporarily move opposite to the direction of the overall motion when it is below the level of the rolling surface (for example, any point in the part of the flange of a train wheel that is below the rail). Since kinetic energy is entirely a function of an object mass and velocity, the above result may be used with the parallel axis theorem to obtain the kinetic energy associated with simple rolling Differentiating the relation between linear and angular "velocity", formula_5, with respect to time gives a formula relating linear and angular "acceleration" formula_6. Applying Newton's second law: It follows that to accelerate the object, both a net force and a torque are required. When external force with no torque acts on the rolling object‐surface system, there will be a tangential force at the point of contact between the surface and rolling object that provides the required torque as long as the motion is pure rolling; this force is usually static friction, for example, between the road and a wheel or between a bowling lane and a bowling ball. When static friction isn't enough, the friction becomes dynamic friction and slipping happens. The tangential force is opposite in direction to the external force, and therefore partially cancels it. The resulting net force and acceleration are: formula_9 has dimension of mass, and it is the mass that would have a rotational inertia formula_10 at distance formula_11 from an axis of rotation. Therefore, the term formula_9 may be thought of as the mass with linear inertia equivalent to the rolling object rotational inertia (around its center of mass). The action of the external force upon an object in simple rotation may be conceptualized as accelerating the sum of the real mass and the virtual mass that represents the rotational inertia, which is formula_13. Since the work done by the external force is split between overcoming the translational and rotational inertia, the external force results in a smaller net force by the dimensionless multiplicative factor formula_14 where formula_15 represents the ratio of the aforesaid virtual mass to the object actual mass and it is equal to formula_16 where formula_17 is the radius of gyration corresponding to the object rotational inertia in pure rotation (not the rotational inertia in pure rolling). The square power is due to the facte rotational inertia of a point mass varies proportionally to the square of its distance to the axis. In the specific case of an object rolling in an inclined plane which experiences only static friction, normal force and its own weight, (air drag is absent) the acceleration in the direction of rolling down the slope is: formula_19 is specific to the object shape and mass distribution, it does not depend on scale or density. However, it will vary if the object is made to roll with different radiuses; for instance, it varies between a train wheel set rolling normally (by its tire), and by its axle. It follows that given a reference rolling object, another object bigger or with different density will roll with the same acceleration. This behavior is the same as that of an object in free fall or an object sliding without friction (instead of rolling) down an inclined plane. Let there be a ball on an inclined plane of angle of inclination of "θ". Let the initial velocity be "u" and final velocity be "v". Let the acceleration be "a". Then, However, "u" = 0 and "a" = "g". So, But, formula_22 Consider a rolling body down an inclined plane and the following- Mass of body = "m", acceleration = "a", initial velocity = "u", final velocity =&nbspto reach bottom = "t", force imparted by body = "F" = "mg", frictional force = "F" = "μF" cos "θ", net force = "F". However, formula_25. So, Suppose that a rolling body is moving uphill, i.e., instead of moving down, a body strikes the base of the inclined plane, naturally, the energy carried by the body shall make it rise up to a certain height. Consider the height as "h". Let the body have velocity "v", accelerating at a and be of mass "m". Acceleration due to gravity is "g". The angle of inclination is "θ". So, the hypotenuse (see figure) becomes formula_27. Now, to rise up to height "h", the body must carry sufficient kinetic energy in order to work against gravity and work to move uphill. Therefore, we have: Taking into consideration the frictional forces involved, we get:
Rolling is a type of motion that combines rotation (commonly, of an axially symmetric object) and translation of that object with respect to a surface (either one or the other moves), such that, if ideal conditions exist, the two are in contact with each other without sliding.
en
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56
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summarize: The primary cause of pneumatic tire rolling resistance is hysteresis: A characteristic of a deformable material such that the energy of deformation is greater than the energy of recovery. The rubber compound in a tire exhibits hysteresis. As the tire rotates under the weight of the vehicle, it experiences repeated cycles of deformation and recovery, and it dissipates the hysteresis energy loss as heat. Hysteresis is the main cause of energy loss associated with rolling resistance and is attributed to the viscoelastic characteristics of the rubber. This main principle is illustrated in the figure of the rolling cylinders. If two equal cylinders are pressed together then the contact surface is flat. In the absence of surface friction, contact stresses are normal (i.e. perpendicular) to the contact surface. Consider a particle that enters the contact area at the right side, travels through the contact patch and leaves at the left side. Initially its vertical deformation is increasing, which is resisted by the hysteresis effect. Therefore, an additional pressure is generated to avoid interpenetration of the two surfaces. Later its vertical deformation is decreasing. This is again resisted by the hysteresis effect. In this case this decreases the pressure that is needed to keep the two bodies separate. The resulting pressure distribution is asymmetrical and is shifted to the right. The line of action of the (aggregate) vertical force no longer passes through the centers of the cylinders. This means that a moment occurs that tends to retard the rolling motion. Materials that have a large hysteresis effect, such as rubber, which bounce back slowly, exhibit more rolling resistance than materials with a small hysteresis effect that bounce back more quickly and more completely, such as steel or silica. Low rolling resistance tires typically incorporate silica in place of carbon black in their tread compounds to reduce low-frequency hysteresis without compromising traction. Note that railroads also have hysteresis in the roadbed structure. In the broad sense, specific "rolling resistance" (for vehicles) is the force per unit vehicle weight required to move the vehicle on level ground at a constant slow speed where aerodynamic drag (air resistance) is insignificant and also where there are no traction (motor) forces or brakes applied. In other words, the vehicle would be coasting if it were not for the force to maintain constant speed. This broad sense includes wheel bearing resistance, the energy dissipated by vibration and oscillation of both the roadbed and the vehicle, and sliding of the wheel on the roadbed surface (pavement or a rail). But there is an even broader sense that would include energy wasted by wheel slippage due to the torque applied from the engine. This includes the increased power required due to the increased velocity of the wheels where the tangential velocity of the driving wheel(s) becomes greater than the vehicle speed due to slippage. Since power is equal to force times velocity and the wheel velocity has increased, the power required has increased accordingly. The pure "rolling resistance" for a train is that which happens due to deformation and possible minor sliding at the wheel-road contact. For a rubber tire, an analogous energy loss happens over the entire tire, but it is still called "rolling resistance". In the broad sense, "rolling resistance" includes wheel bearing resistance, energy loss by shaking both the roadbed (and the earth underneath) and the vehicle itself, and by sliding of the wheel, road/rail contact. Railroad textbooks seem to cover all these resistance forces but do not call their sum "rolling resistance" (broad sense) as is done in this article. They just sum up all the resistance forces (including aerodynamic drag) and call the sum basic train resistance (or the like). Since railroad rolling resistance in the broad sense may be a few times larger than just the pure rolling resistance reported values may be in serious conflict since they may be based on different definitions of "rolling resistance". The train's engines must, of course, provide the energy to overcome this broad-sense rolling resistance. For tires, rolling resistance is defined as the energy consumed by a tire per unit distance covered. It is also called rolling friction or rolling drag. It is one of the forces that act to oppose the motion of a driver. The main reason for this is that when the tires are in motion and touch the surface, the surface changes shape and causes deformation of the tire. For highway motor vehicles, there is obviously some energy dissipated in shaking the roadway (and the earth beneath it), the shaking of the vehicle itself, and the sliding of the tires. But, other than the additional power required due to torque and wheel bearing friction, non-pure rolling resistance doesn't seem to have been investigated, possibly because the "pure" rolling resistance of a rubber tire is several times higher than the neglected resistances. The "rolling resistance coefficient" is defined by the following equation: formula_4 is the force needed to push (or tow) a wheeled vehicle forward (at constant speed on a level surface, or zero grade, with zero air resistance) per unit force of weight. It is assumed that all wheels are the same and bear identical weight. Thus: formula_7 means that it would only take 0.01 pounds to tow a vehicle weighing one pound. For a 1000-pound vehicle, it would take 1000 times more tow force, i.e. 10 pounds. One could say that formula_4 is in lb(tow-force)/lb(vehicle weight). Since this lb/lb is force divided by force, formula_4 is dimensionless. Multiply it by 100 and you get the percent (%) of the weight of the vehicle required to maintain slow steady speed. formula_4 is often multiplied by 1000 to get the parts per thousand, which is the same as kilograms (kg force) per metric ton (tonne = 1000 kg ), which is the same as pounds of resistance per 1000 pounds of load or Newtons/kilo-Newton, etc. For the US railroads, lb/ton has been traditionally used; this is just formula_11. Thus, they are all just measures of resistance per unit vehicle weight. While they are all "specific resistances", sometimes they are just called "resistance" although they are really a coefficient (ratio)or a multiple thereof. If using pounds or kilograms as force units, mass is equal to weight (in earth's gravity a kilogram a mass weighs a kilogram and exerts a kilogram of force) so one could claim that formula_4 is also the force per unit mass in such units. The SI system would use N/tonne (N/T, N/t), which is formula_13 and is force per unit mass, where "g" is the acceleration of gravity in SI units (meters per second square). The above shows resistance proportional to formula_14 but does not explicitly show any variation with speed, loads, torque, surface roughness, diameter, tire inflation/wear, etc., because formula_4 itself varies with those factors. It might seem from the above definition of formula_14 that the rolling resistance is directly proportional to vehicle weight but it is not. There are at least two popular models for calculating rolling resistance. The results of these tests can be hard for the general public to obtain as manufacturers prefer to publicize "comfort" and "performance". The coefficient of rolling resistance for a slow rigid wheel on a perfectly elastic surface, not adjusted for velocity, can be calculated by Empirical formula for formula_21 for cast iron mine car wheels on steel rails. As an alternative to using formula_25 one can use formula_26, which is a different rolling resistance coefficient or coefficient of rolling friction with dimension of length. It is defined by the following formula: The above equation, where resistance is inversely proportional to radius r. seems to be based on the discredited "Coulomb's law" (Neither Coulomb's inverse square law nor Coulomb's law of friction) (needs citation). See dependence on diameter. Equating this equation with the force per the rolling resistance coefficient, and solving for b, gives b = C·r. Therefore, if a source gives rolling resistance coefficient (C) as a dimensionless coefficient, it can be converted to b, having units of length, by multiplying C by wheel radius r. Table of rolling resistance coefficient examples: For example, in earth gravity, a car of 1000 kg on asphalt will need a force of around 100 newtons for rolling (1000 kg × 9.81 m/s × 0.01 = 98.1 N). According to Dupuit (1837), rolling resistance (of wheeled carriages with wooden wheels with iron tires) is approximately inversely proportional to the square root of wheel diameter. This rule has been experimentally verified for cast iron wheels (8" - 24" diameter) on steel rail and for 19th century carriage wheels. But there are other tests on carriage wheels that do not agree. Theory of a cylinder rolling on an elastic roadway also gives this same rule These contradict earlier (1785) tests by Coulomb of rolling wooden cylinders where Coulomb reported that rolling resistance was inversely proportional to the diameter of the wheel (known as "Coulomb's law"). This disputed (or wrongly applied) -"Coulomb's law" is still found in handbooks, however. For pneumatic tires on hard pavement, it is reported that the effect of diameter on rolling resistance is negligible (within a practical range of diameters). The driving torque formula_32 to overcome rolling resistance formula_33 and maintain steady speed on level ground (with no air resistance) can be calculated by: It is noteworthy that formula_37 is usually not equal to the radius of the rolling body. "Applied torque" may either be driving torque applied by a motor (often through a transmission) or a braking torque applied by brakes (including regenerative braking). Such torques results in energy dissipation (above that due to the basic rolling resistance of a freely rolling, non-driven, non-braked wheel). This additional loss is in part due to the fact that there is some slipping of the wheel, and for pneumatic tires, there is more flexing of the sidewalls due to the torque. Slip is defined such that a 2% slip means that the circumferential speed of the driving wheel exceeds the speed of the vehicle by 2%. A small percentage slip can result in a much larger percentage increase in rolling resistance. For example, for pneumatic tires, a 5% slip can translate into a 200% increase in rolling resistance. This is partly because the tractive force applied during this slip is many times greater than the rolling resistance force and thus much more power per unit velocity is being applied (recall power = force x velocity so that power per unit of velocity is just force). So just a small percentage increase in circumferential velocity due to slip can translate into a loss of traction power which may even exceed the power loss due to basic (ordinary) rolling resistance. For railroads, this effect may be even more pronounced due to the low rolling resistance of steel wheels. In order to apply any traction to the wheels, some slippage of the wheel is required. For Russian trains climbing up a grade, this slip is normally 1.5% to 2.5%. Slip (also known as creep) is normally roughly directly proportional to tractive effort. An exception is if the tractive effort is so high that the wheel is close to substantial slipping (more than just a few percent as discussed above), then slip rapidly increases with tractive effort and is no longer linear. With a little higher applied tractive effort the wheel spins out of control and the adhesion drops resulting in the wheel spinning even faster. This is the type of slipping that is observable by eye—the slip of say 2% for traction is only observed by instruments. Such rapid slip may result in excessive wear or damage. Rolling resistance greatly increases with applied torque. At high torques, which apply a tangential force to the road of about half the weight of the vehicle, the rolling resistance may triple (a 200% increase). This is in part due to a slip of about 5%. The rolling resistance increase with applied torque is not linear, but increases at a faster rate as the torque becomes higher. The rolling resistance coefficient, Crr, significantly decreases as the weight of the rail car per wheel increases. For example, an empty Russian freight car had about twice the Crr as loaded car (Crr=0.002 vs. Crr=0.001). This same "economy of scale" shows up in testing of mine rail cars. The theoretical Crr for a rigid wheel rolling on an elastic roadbed shows Crr inversely proportional to the square root of the load. If Crr is itself dependent on wheel load per an inverse square-root rule, then for an increase in load of 2% only a 1% increase in rolling resistance occurs. For pneumatic tires, the direction of change in Crr (rolling resistance coefficient) depends on whether or not tire inflation is increased with increasing load. It is reported that, if inflation pressure is increased with load according to an (undefined) "schedule", then a 20% increase in load decreases Crr by 3%. But, if the inflation pressure is not changed, then a 20% increase in load results in a 4% increase in Crr. Of course, this will increase the rolling resistance by 20% due to the increase in load plus 1.2 x 4% due to the increase in Crr resulting in a 24.8% increase in rolling resistance. When a vehicle (motor vehicle or railroad train) goes around a curve, rolling resistance usually increases. If the curve is not banked so as to exactly counter the centrifugal force with an equal and opposing centripetal force due to the banking, then there will be a net unbalanced sideways force on the vehicle. This will result in increased rolling resistance. Banking is also known as "superelevation" or "cant" (not to be confused with rail cant of a rail). For railroads, this is called curve resistance but for roads it has (at least once) been called rolling resistance due to cornering. Rolling friction generates sound (vibrational) energy, as mechanical energy is converted to this form of energy due to the friction. One of the most common examples of rolling friction is the movement of motor vehicle tires on a roadway, a process which generates sound as a by-product. The sound generated by automobile and truck tires as they roll (especially noticeable at highway speeds) is mostly due to the percussion of the tire treads, and compression (and subsequent decompression) of air temporarily captured within the treads. Several factors affect the magnitude of rolling resistance a tire generates: In a broad sense rolling resistance can be defined as the sum of components): Wheel bearing torque losses can be measured as a rolling resistance at the wheel rim, Crr. Railroads normally use roller bearings which are either cylindrical (Russia) or tapered (United States). The specific rolling resistance in Russian bearings varies with both wheel loading and speed. Wheel bearing rolling resistance is lowest with high axle loads and intermediate speeds of 60–80 km/h with a Crr of 0.00013 (axle load of 21 tonnes). For empty freight cars with axle loads of 5.5 tonnes, Crr goes up to 0.00020 at 60 km/h but at a low speed of 20 km/h it increases to 0.00024 and at a high speed (for freight trains) of 120 km/h it is 0.00028. The Crr obtained above is added to the Crr of the other components to obtain the total Crr for the wheels. The rolling resistance of steel wheels on steel rail of a train is far less than that of the rubber tires wheels of an automobile or truck. The weight of trains varies greatly; in some cases they may be much heavier per passenger or per net ton of freight than an automobile or truck, but in other cases they may be much lighter. As an example of a very heavy passenger train, in 1975, Amtrak passenger trains weighed a little over 7 tonnes per passenger, which is much heavier than an average of a little over one ton per passenger for an automobile. This means that for an Amtrak passenger train in 1975, much of the energy savings of the lower rolling resistance was lost to its greater weight. An example of a very light high-speed passenger train is the N700 Series Shinkansen, which weighs 715 tonnes and carries 1323 passengers, resulting in a per-passenger weight of about half a tonne. This lighter weight per passenger, combined with the lower rolling resistance of steel wheels on steel rail means that an N700 Shinkansen is much more energy efficient than a typical automobile. In the case of freight, CSX ran an advertisement campaign in 2013 claiming that their freight trains move "a ton of freight 436 miles on a gallon of fuel", whereas some sources claim trucks move a ton of freight about 130 miles per gallon of fuel, indicating trains are more efficient overall.
Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc., is recovered when the pressure is removed. Two forms of this are hysteresis losses (see below), and permanent (plastic) deformation of the object or the surface (e.g. soil). Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy. Note that only the last of these effects involves friction, therefore the name "rolling friction" is to an extent a misnomer.
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summarize: Currently 249 countries, territories, or areas of geographical interest are assigned official codes in ISO 3166-1. According to the ISO 3166 Maintenance Agency (ISO 3166/MA), the only way to enter a new country name into ISO 3166-1 is to have it registered in one of the following two sources: To be listed in the bulletin "Country Names", a country must be at least one of the following: The list of names in "Country and Region Codes for Statistical Use" of the UN Statistics Division is based on the bulletin "Country Names" and other UN sources. Once a country name or territory name appears in either of these two sources, it will be added to ISO 3166-1 by default. The ISO 3166/MA may reserve code elements for other entities that do not qualify for inclusion based on the above criteria. For example, because the European Union is not a country, it is not formally included in ISO 3166-1, but for practical reasons, the ISO 3166/MA has "reserved the two-letter combination for the purpose of identifying the European Union within the framework of ISO 3166-1". ISO 3166-1 is published officially in both English and French. Since the second edition of ISO 3166-1, the following columns are included for each entry: The country names used in ISO 3166-1 are taken from the two UN sources mentioned above. Some country names used by the UN, and accordingly by ISO, are subject to dispute: The codes are chosen, according to the ISO 3166/MA, "to reflect the significant, unique component of the country name in order to allow a visual association between country name and country code". For this reason, common components of country names like "Republic", "Kingdom", "United", "Federal" or "Democratic" are normally not used for deriving the code elements. As a consequence, for example, the United Kingdom is officially assigned the alpha-2 code rather than, based on its official name "United Kingdom of Great Britain and Northern Ireland" (although is reserved on the request of the United Kingdom). Some codes are chosen based on the native names of the countries. For example, Germany is assigned the alpha-2 code, based on its native name "Deutschland". The following is a complete ISO 3166-1 encoding list of the countries which are assigned official codes. It is listed in alphabetical order by the country's English short name used by the ISO 3166/MA. "Note: Each country's alpha-2 code is linked to more information about the assignment of its code elements." Besides the officially assigned codes, code elements may be expanded by using either reserved codes or user-assigned codes. Reserved code elements are codes which have become obsolete, or are required in order to enable a particular user application of the standard but do not qualify for inclusion in ISO 3166-1. To avoid transitional application problems and to aid users who require specific additional code elements for the functioning of their coding systems, the ISO 3166/MA, when justified, reserves these codes which it undertakes not to use for other than specified purposes during a limited or indeterminate period of time. Codes are usually reserved for former countries, overseas territories, international organizations, and special nationality status. The reserved alpha-2 and alpha-3 codes can be divided into the following four categories "(click on the links for the reserved codes of each category)": User-assigned code elements are codes at the disposal of users who need to add further names of countries, territories, or other geographical entities to their in-house application of ISO 3166-1, and the ISO 3166/MA will never use these codes in the updating process of the standard. The following codes can be user-assigned: The ISO 3166/MA updates ISO 3166-1 when necessary. A country is usually assigned new ISO 3166-1 codes if it changes its name or its territorial boundaries. In general, new alphabetic codes are assigned if a country changes a significant part of its name, while a new numeric code is assigned if a country changes its territorial boundaries. Codes for formerly used country names that were deleted from ISO 3166-1 are published in ISO 3166-3. ISO used to announce changes in newsletters which updated the currently valid standard, and releasing new editions which comprise a consolidation of newsletter changes. As of July 2013, changes are published in the online catalogue of ISO only, and no newsletters are published anymore. Past newsletters remain available through the search option on the ISO website.
ISO 3166-1 is part of the ISO 3166 standard published by the International Organization for Standardization (ISO), and defines codes for the names of countries, dependent territories, and special areas of geographical interest. The official name of the standard is "Codes for the representation of names of countries and their subdivisions – Part 1: Country codes". It defines three sets of country codes:
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summarize: Born in Prague, Špidla studied history at Charles University. His thesis was "Založení Živnostenské banky" (Establishment of the Entrepreneurial Bank). After his graduation in 1976, he worked in several different jobs, including menial ones, as he refused to fulfil political obligations necessary for access to better employment. He also worked as an archaeologist. Špidla entered local politics in his hometown of Jindřichův Hradec after the Velvet Revolution, joining the re-established Czech Social Democratic Party (ČSSD, then called "Czechoslovak Social Democracy"). In 1991–1996 he served as the director of the district labour office. In 1992, he became a member of the Presidium of ČSSD, in March 1997 its statutory Vice-Chairman, and in April 2001 Chairman of ČSSD after the previous chairman Miloš Zeman resigned. He was elected to parliament in 1996, and was First Deputy Prime Minister and Minister of Labour and Social Affairs in the government of Miloš Zeman from 22 July 1998 to 12 July 2002. He was appointed Prime Minister on 12 July 2002 in the coalition government of ČSSD and the smaller Christian Democratic Union - Czechoslovak People's Party and Freedom Union-Democratic Union. During that time, he also held Presidential powers from 2 February 2003 until 7 March 2003, as the presidential term ended before the Parliament could elect a new one. His government proposed some reformed to address the growing budget deficit, but their proposals were criticised by the opposition being too mild, as well as focusing too much on tax increases rather than spending cuts. Partly due to tensions within the coalition and a slim majority in the parliament, the government was unable or unwilling to take more radical measures. Špidla resigned as Prime Minister in June 2004 following poor results for his party and coalition partners in the 2004 European Parliament elections and subsequent loss of support within ČSSD, and he left office on 26 July 2004. He was succeeded by Interior Minister and Deputy Prime Minister Stanislav Gross, whose government was sworn in on 4 August. Špidla then accepted the nomination to the European Commission, where he became European Commissioner for Employment, Social Affairs and Equal Opportunities from 22 November 2004. Špidla was considered to be on the left wing of ČSSD, though strongly anti-communist. In foreign policy, he was strongly pro-European and supports further integration. His public image is of personal integrity and honesty, but also of a dry technocrat who struggled to communicate his vision to the public or control his party. His acceptance of the European Commissioner post was criticised as a "golden parachute", as well as an abandonment of ČSSD and Czech politics. As a Commissioner, Špidla stated his desire to preserve the European social model, saying that Europe needs to preserve its "core values of social justice, equality, respect for rights and dignity for every individual." His key policies were to "create more and better jobs," "reap the benefits of its enlargement," "address the impact of demographic ageing" and "promote an inclusive society." He also created a European Globalisation adjustment Fund (EGF) similar to the European Social Fund to help businesses adjust to the effects of globalisation. He stood down in February 2010. Špidla tried to return to Czech politics, running for a seat in the Czech senate at the 2010 elections, but was defeated by incumbent Tomáš Jirsa of the Civic Democrats. In 2014, Špidla became Chief Adviser to Prime Minister Bohuslav Sobotka. Špidla has been married twice; he has two sons from his first marriage and another two children acquired by marriage. His hobbies include cross-country and marathon running. He speaks German and French, but his English is weaker, which was used to question his qualifications for the European Commission.
Vladimír Špidla () (born 22 April 1951) is a Czech politician who served as Prime Minister of the Czech Republic from July 2002 to August 2004 and as European Commissioner for Employment, Social Affairs and Equal Opportunities from November 2004 to February 2010. He also served as chief adviser to Prime Minister Bohuslav Sobotka from 2014 to 2017.
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summarize: The "H" in the name of Hungary (and Latin "Hungaria") is most likely due to founded historical associations with the Huns, who had settled Hungary prior to the Avars. The rest of the word comes from the Latinized form of Byzantine Greek "Oungroi" (Οὔγγροι). The Greek name was borrowed from Old Bulgarian "ągrinŭ", in turn borrowed from Oghur-Turkic "Onogur" ('ten [tribes of the] Ogurs'). "Onogur" was the collective name for the tribes who later joined the Bulgar tribal confederacy that ruled the The Roman Empire conquered the territory west of the Danube River between 35 and 9 BC. From 9 BC to the end of the 4th century AD, Pannonia, the western part of the Carpathian Basin, was part of the Roman Empire. After the Western Roman Empire collapsed in the 5th century AD under the stress of the migration of Germanic tribes and Carpian pressure, the Migration Period continued to bring many invaders into Central Europe, beginning with the Hunnic Empire (c. 370–469). The most powerful ruler of the Hunnic Empire was Attila the Hun (434–453) who The freshly unified Hungarians led by Árpád (by tradition a descendant of Attila), settled in the Carpathian Basin starting in 895. According to the Finno-Ugrian theory, they originated from an ancient Uralic-speaking population that formerly inhabited the forested area between the Volga River and the Ural Mountains. As a federation of united tribes, Hungary was established in 895, some 50 years after the division of the Carolingian Empire at the Treaty of Verdun in 843, before the unification of the Anglo-Saxon kingdoms. Initially, the rising Principality of Hungary ("Western Tourkia" in medieval Greek sources) was a state created by a semi-nomadic people. It accomplished an enormous transformation into a Christian realm during the 10th century. This state was well-functioning and the nation's military power allowed the Hungarians to conduct successful fierce campaigns and raids, from Constantinople to as far as today's Spain. The Hungarians defeated no fewer than three major East Frankish imperial armies between 907 and 910. A later defeat at the Battle of Lechfeld in 955 signaled a provisory end to most campaigns on foreign territories, at least towards the West. The year 972 marked the date when the ruling prince () Géza of the Árpád dynasty officially started to integrate Hungary into the Christian Western Europe. His first-born son, Saint Stephen I, became the first King of Hungary after defeating his pagan uncle Koppány, who also claimed the throne. Under Stephen, Hungary was recognized as a Catholic Apostolic Kingdom. Applying to Pope Sylvester II, Stephen received the insignia of royalty (including probably a part of the Holy Crown of Hungary, currently kept in the Hungarian Parliament) from the papacy. By 1006, Stephen consolidated his power, and started sweeping reforms to convert Hungary into a Western feudal state. The country switched to using the Latin language, and until as late as 1844, Latin remained the official language of Hungary. Around this time, Hungary began to become a powerful kingdom. Ladislaus I extended Hungary's frontier in Transylvania and invaded Croatia in 1091. The Croatian campaign culminated in the Battle of Gvozd Mountain in 1097 and a personal union of Croatia and Hungary in 1102, ruled by Coloman i.e. Könyves Kálmán. The Kingdom of Hungary reached one of its greatest extents during the Árpádian kings, yet royal power was weakened at the end of their rule in 1301. After a destructive period of interregnum (1301–1308), the first Angevin king, Charles I of Hungary – a bilineal descendant of the Árpád dynasty – successfully restored royal power, and defeated oligarch rivals, the so-called "little kings". The second Angevin Hungarian king, Louis the Great (1342–1382), led many successful military campaigns from Lithuania to Southern Italy (Kingdom of Naples), and was also King of Poland from 1370. After King Louis died without a male heir, the country was stabilized only when Sigismund of Luxembourg (1387–1437) succeeded to the throne, who in 1433 also became Holy Roman Emperor. Sigismund was also (in several ways) a bilineal descendant of the Árpád dynasty. The first Hungarian Bible translation was completed in 1439. For half a year in 1437, there was an antifeudal and anticlerical peasant revolt in Transylvania, the Budai Nagy Antal Revolt, King Matthias died without lawful sons, and the Hungarian magnates procured the accession of the Pole Vladislaus II (1490–1516), supposedly because of his weak influence on Hungarian aristocracy. Hungary's international role declined, its political stability shaken, and social progress was deadlocked. In 1514, the weakened old King Vladislaus II faced a major peasant rebellion led by György Dózsa, which was ruthlessly crushed by the nobles, led by John Zápolya. The resulting degradation of order paved the way for Ottoman pre-eminence. In 1521, the strongest Hungarian fortress in the South, Nándorfehérvár (today's Belgrade, Serbia), fell to the Turks. The early appearance of Protestantism further worsened internal relations in the country. After some 150 years of wars with the Hungarians and other states, the Ottomans gained a decisive victory over the Hungarian army at the Battle of Mohács in 1526, where King Louis II died while fleeing. Amid political chaos, the divided Hungarian nobility elected two kings simultaneously, John Zápolya and Ferdinand I of the Habsburg dynasty. With the conquest of Buda by the Turks in 1541, Hungary was divided into three parts and remained so until the end of the 17th century. The north-western part, termed as Royal Hungary, was annexed by the Habsburgs who ruled as Kings of Hungary. The eastern part of the kingdom became independent as the Principality of Transylvania, under Ottoman (and later Habsburg) suzerainty. The remaining central area, including the capital Buda, was known as the Pashalik of Buda. The Between 1703 and 1711, there was a large-scale uprising led by Francis II Rákóczi, who after the dethronement of the Habsburgs in 1707 at the Diet of Ónod, took power provisionally as the Ruling Prince of Hungary for the wartime period, but refused the Hungarian Crown and the title "King". The uprisings lasted for years. The Hungarian Kuruc army, although taking over most of the country, lost the main battle at Trencsén (1708). Three years later, because of the growing desertion, defeatism and low morale, the Kuruc forces finally surrendered. During the Napoleonic Wars and afterwards, the Hungarian Diet had not convened for decades. In the 1820s, the Emperor was forced to convene the Diet, which marked the beginning of a Reform Period (1825–1848, ). Count István Széchenyi, one of the most prominent statesmen of the country, recognized the urgent need of modernization and his message got through. The Hungarian Parliament was reconvened in 1825 to handle financial needs. A liberal party emerged and focused on providing for the peasantry. Lajos Kossuth – a famous journalist at that time – emerged as leader of the lower gentry in the Parliament. A remarkable upswing started as the nation concentrated its forces on modernization even though the Habsburg monarchs obstructed all important liberal laws relating to civil and political rights and economic reforms. Many reformers (Lajos Kossuth, Mihály Táncsics) were imprisoned by the authorities. On 15 March 1848, mass demonstrations in Pest and Buda enabled Hungarian reformists to push through a list of 12 demands. Under governor and president Lajos Kossuth and the first Prime Minister, Lajos Batthyány, the House of Habsburg was dethroned. The Habsburg Ruler and his advisors skillfully manipulated the Croatian, Serbian and Romanian peasantry, led by priests and officers firmly loyal to the Habsburgs, and induced them to rebel against the Hungarian government, though the Hungarians were supported by the vast majority of the Slovak, German and Rusyn nationalities and by all the Jews of the kingdom, as well as by a large number of Polish, Austrian and Italian volunteers. In July 1849 the Hungarian Parliament proclaimed and enacted the first laws of ethnic and minority rights in the world. Many members of the nationalities gained the coveted highest positions within the Hungarian Army, like General János Damjanich, an ethnic Serb who became a Hungarian national hero through his command Following the First World War, Hungary underwent a period of profound political upheaval, beginning with the Aster Revolution in 1918, which brought the social-democratic Mihály Károlyi to power as Prime Minister. The Hungarian Royal Honvéd army still had more than 1,400,000 soldiers when Mihály Károlyi was announced as prime minister of Hungary. Károlyi yielded to U.S. President Woodrow Wilson's demand for pacifism by ordering the disarmament of the Hungarian army. This happened under the direction of Béla Linder, minister of war in the Károlyi government. Due to the full disarmament of its army, Hungary was to remain without a national defence at a time of particular vulnerability. During the rule of Károlyi's pacifist cabinet, Hungary lost the control over approx. 75% of its former pre-WW1 territories (325 411 km2) without fight and was subject to foreign occupation. The Little Entente, sensing an opportunity, invaded the country from three sides—Romania invaded Transylvania, Czechoslovakia annexed Upper Hungary (today's Slovakia), and a joint Serb-French coalition annexed Vojvodina and other southern regions. In March 1919, communists led by Béla Kun ousted the Károlyi government and proclaimed the Hungarian Soviet Republic ("Tanácsköztársaság"), followed by a thorough Red Terror campaign. Despite some successes on the Czechoslovak front, Kun's forces were ultimately unable to resist the Romanian invasion; by August 1919, Romanian troops occupied Budapest and ousted Kun. In November Hungary formally entered World War II as an Axis Power on 26 June 1941, declaring war on the Soviet Union after unidentified planes bombed Kassa, Munkács, and Rahó. Hungarian troops fought on the Eastern Front for two years. Despite some early successes, the Hungarian government began seeking a secret peace pact with the Allies after the Second Army suffered catastrophic losses at the River Don in January 1943. Learning of the planned defection, German troops occupied Hungary on 19 March 1944 to guarantee Horthy's compliance. In October, as the Soviet front approached and the Hungarian government made further efforts to disengage from the war, German troops ousted Horthy and installed a puppet government under Szálasi's fascist Arrow Cross Party. Szálasi pledged all the country's capabilities in service of the German war machine. By October 1944, the Soviets had reached the river Tisza, Following the defeat of Nazi Germany, Hungary became a satellite state of the Soviet Union. The Soviet leadership selected Mátyás Rákosi to front the Stalinization of the country, and Rákosi "de facto" ruled Hungary from 1949 to 1956. His government's policies of militarization, industrialization, collectivization, and war compensation led to a severe decline in living standards. In imitation of Stalin's KGB, the Rákosi government established a secret political police, the ÁVH, to enforce the new regime. In the ensuing purges approximately 350,000 officials and intellectuals were imprisoned or executed from 1948 to 1956. Many freethinkers, democrats, and Horthy-era dignitaries were secretly arrested and extrajudicially interned in domestic and foreign Gulags. Some 600,000 Hungarians were deported to Soviet labor camps, where at least 200,000 died. After Stalin's death in 1953, the Soviet Union pursued a program of destalinization that was inimical to Rákosi, leading to his deposition. The following political cooling saw the ascent of Imre Nagy to the premiership, and the growing interest of students and intellectuals in political life. Nagy promised market liberalization and political openness, while Rákosi opposed both vigorously. Rákosi eventually managed to discredit Nagy and replace him with the more hard-line Ernő Gerő. Hungary joined the Warsaw Pact in May 1955, as societal dissatisfaction with the regime swelled. Following the firing on peaceful demonstrations by Soviet soldiers and secret police, and rallies throughout the country on 23 October 1956, protesters took to the streets in Budapest, initiating the 1956 Revolution. In an effort to quell the chaos, Nagy returned as premier, promised free elections, and took Hungary out of the Warsaw Pact. The violence nonetheless continued as revolutionary militias sprung up against the Soviet Army and the ÁVH; the roughly 3,000-strong resistance fought Soviet tanks using Molotov cocktails and machine-pistols. Though the preponderance of the Soviets was immense, they suffered heavy losses, and by 30 October 1956 most Soviet troops had withdrawn from Budapest to garrison the countryside. For a time, the Soviet leadership was unsure how to respond to developments in Hungary, but eventually decided to intervene to prevent a destabilization of the Soviet bloc. On 4 November reinforcements of more than 150,000 troops and 2,500 tanks entered the country from the Soviet Union. Nearly 20,000 Hungarians were killed resisting the intervention, while an additional 21,600 were imprisoned afterwards for political reasons. Some 13,000 were interned and 230 brought to trial and executed. Nagy was secretly tried, found guilty, sentenced to death and executed by hanging in June 1958. Because borders were briefly opened, nearly a quarter of a million people fled the country by the time the revolution was suppressed. Hungary's transition from communism to democracy and capitalism ("rendszerváltás", "regime change") was peaceful and prompted by economic stagnation, domestic political pressure, and changing relations with other Warsaw Pact countries. Although the MSzMP began Round Table Talks with various opposition groups in March 1989, the reburial of Imre Nagy as a revolutionary martyr that June is widely considered the symbolic end of communism in Hungary. Over 100,000 people attended the Budapest ceremony without any significant government interference, and many speakers openly called for Soviet troops to leave the country. Free elections were held in May 1990, and the Hungarian Democratic Forum, a major conservative opposition group, was elected to the head of a coalition government. József Antall became the first democratically elected Prime Minister since World War II. With the removal of state subsidies and rapid privatization in 1991, Hungary was affected by a severe economic recession. The Antall government's austerity measures proved unpopular, and the Communist Party's legal and political heir, the Socialist Party, won the subsequent 1994 elections. This abrupt shift in the political landscape was repeated in 1998 and 2002; each electoral cycle, the governing party was ousted and the erstwhile opposition elected. Like most other post-communist European states, however, Hungary broadly pursued an integrationist agenda, joining NATO in 1999 and the European
Hungary ( ) is a country in Central Europe. Spanning in the Carpathian Basin, it borders Slovakia to the north, Ukraine to the northeast, Romania to the east and southeast, Serbia to the south, Croatia and Slovenia to the southwest, and Austria to the west. With about 10 million inhabitants, Hungary is a medium-sized member state of the European Union. The official language is Hungarian, which is the most widely spoken Uralic language in the world, and among the few non-Indo-European languages to be widely spoken in Europe. Hungary's capital and largest city is Budapest; other major urban areas include Debrecen, Szeged, Miskolc, Pécs, and Győr.
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summarize: By convention, "continents are understood to be large, continuous, discrete masses of land, ideally separated by expanses of water." In modern schemes with five or more recognised continents, at least one pair of continents is joined by land in some way. The criterion "large" leads to arbitrary classification: Greenland, with a surface area of is considered the world's largest island, while Australia, at is deemed the smallest continent. Earth's major landmasses all have coasts on a single, continuous World Ocean, which is divided into a number of principal oceanic components by the continents and various geographic criteria. The most restricted meaning of "continent" is that of a continuous area of land or mainland, with the coastline and any land boundaries forming the edge of the continent. In this sense the term "continental Europe" (sometimes referred to in Britain as "the Continent") is used to refer to mainland Europe, excluding islands such as Great Britain, Ireland, Malta and Iceland, and the term "continent of Australia" may refer to the mainland of Australia, excluding Tasmania and New Guinea. Similarly, the "continental United States" refers to the 48 contiguous states and the District of Columbia in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the Pacific Ocean. From the perspective of geology or physical geography, "continent" may be extended beyond the confines of continuous dry land to include the shallow, submerged adjacent area (the continental shelf) and the islands on the shelf (continental islands), as they are structurally part of the continent. From this perspective, the edge of the continental shelf is the true edge of the continent, as shorelines vary with changes in sea level. In this sense the islands of Great Britain and Ireland are part of Europe, while Australia and the island of New Guinea together form a continent. As a cultural construct, the concept of a continent may go beyond the continental shelf to include oceanic islands and continental fragments. In this way, Iceland is considered part of Europe and Madagascar part of Africa. Extrapolating the concept to its extreme, some geographers group the Australian continental plate with other islands in the Pacific into one "quasi-continent" called Oceania. This divides the entire land surface of Earth into continents or quasi-continents. The ideal criterion that each continent is a discrete landmass is commonly relaxed due to historical conventions. Of the seven most globally recognized continents, only Antarctica and Australia are completely separated from other continents by the ocean. Several continents are defined not as absolutely distinct bodies but as ""more or less" discrete masses of land". Asia and Africa are joined by the Isthmus of Suez, and North and South America by the Isthmus of Panama. In both cases, there is no complete separation of these landmasses by water (disregarding the Suez Canal and Panama Canal, which are both narrow and shallow, as well as man-made). Both these isthmuses are very narrow compared to the bulk of the landmasses they unite. North America and South America are treated as separate continents in the seven-continent model. However, they may also be viewed as a single continent known as America. This viewpoint was common in the United States until World War II, and remains prevalent in some Asian six-continent models. This remains the more common vision in Latin American countries, Spain, Portugal, France, Italy, Germany, Greece and Hungary, where they are taught as a single continent. The criterion of a discrete landmass is completely disregarded if the continuous landmass of Eurasia is classified as two separate continents: Europe and Asia. Physiographically, Europe and South Asia are peninsulas of the Eurasian landmass. However, Europe is widely considered a continent with its comparatively large land area of, while South Asia, with less than half that area, is considered a subcontinent. The alternative view—in geology and geography—that Eurasia is a single continent results in a six-continent view of the world. Some view separation of Eurasia into Asia and Europe as a residue of Eurocentrism: "In physical, cultural and historical diversity, China and India are comparable to the entire European landmass, not to a single European country. [...]." However, for historical and cultural reasons, the view of Europe as a separate continent continues in several categorizations. If continents are defined strictly as discrete landmasses, embracing all the contiguous land of a body, then Africa, Asia, and Europe form a single continent which may be referred to as Afro-Eurasia. Combined with the consolidation of the Americas, this would produce a four-continent model consisting of Afro-Eurasia, America, Antarctica and Australia. When sea levels were lower during the Pleistocene ice ages, greater areas of continental shelf were exposed as dry land, forming land bridges. At those times Australia–New Guinea was a single, continuous continent. Likewise, the Americas and Afro-Eurasia were joined by the Bering land bridge. Other islands such as Great Britain were joined to the mainlands of their continents. At that time there were just three discrete continents: Afro-Eurasia-America, Antarctica, and Australia-New Guinea. There are several ways of distinguishing the continents: As previously mentioned, some geographers use the name Oceania for a region including most of the island countries and territories in the Pacific Ocean as well as the continent of Australia. The following table summarizes the area and population of the continental regions used by the United Nations. These regions differ from the physical continents in various ways that are explained in the notes. The total land area of all continents is, or 29.1% of earth's surface (). Aside from the conventionally known continents, the scope and meaning of the term "continent" varies. Supercontinents, largely in evidence earlier in the geological record, are landmasses that comprise more than one craton or continental core. These have included Laurasia, Gondwana, Vaalbara, Kenorland, Columbia, Rodinia, and Pangaea. Over time, these supercontinents broke apart into large land masses which caused the formation of the present continents. Certain parts of continents are recognized as subcontinents, especially the large peninsulas separated from the main continental landmass by geographical features. The most notable examples are the Indian subcontinent and the Arabian Peninsula. The Southern Cone of South America and the Alaska peninsula of North America are other examples. In many of these cases, the "subcontinents" concerned are on different tectonic plates from the rest of the continent, providing a geological justification for the terminology. Greenland, generally reckoned as the world's largest island on the northeastern periphery of the North American Plate, is sometimes referred to as a subcontinent. This is a significant departure from the more conventional view of a subcontinent as comprising a very large peninsula on the fringe of a continent. Where the Americas are viewed as a single continent (America), it is divided into two subcontinents (North America and South America) or three (with Central America being the third). When Eurasia is regarded as a single continent, Europe is treated as a subcontinent. Some areas of continental crust are largely covered by the sea and may be considered submerged continents. Notable examples are Zealandia, emerging from the sea primarily in New Zealand and New Caledonia, and the almost completely submerged Kerguelen Plateau in the southern Indian Ocean. Some islands lie on sections of continental crust that have rifted and drifted apart from a main continental landmass. While not considered continents because of their relatively small size, they may be considered microcontinents. Madagascar, the largest example, is usually considered an island of Africa, but its divergent evolution has caused it to be referred to as "the eighth continent" from a biological perspective. "Continents" may be defined differently for specific purposes. The Biodiversity Information Standards organization has developed the World Geographical Scheme for Recording Plant Distributions, used in many international plant databases. This scheme divides the world into nine "botanical continents". Some match the traditional geographical continents, but some differ significantly. Thus the Americas are divided between Northern America (Mexico northwards) and Southern America (Central America and the Caribbean southwards) rather than between North America and South America. The term "continent" translates Greek, properly "landmass, terra firma", the proper name of Epirus and later especially used of Asia (i.e. Asia Minor), The first distinction between continents was made by ancient Greek mariners who gave the names Europe and Asia to the lands on either side of the waterways of the Aegean Sea, the Dardanelles strait, the Sea of Marmara, the Bosporus strait and the Black Sea. The names were first applied just to lands near the coast and only later extended to include the hinterlands. But the division was only carried through to the end of navigable waterways and "... beyond that point the Hellenic geographers never succeeded in laying their finger on any inland feature in the physical landscape that could offer any convincing line for partitioning an indivisible Eurasia..." Ancient Greek thinkers subsequently debated whether Africa (then called "Libya") should be considered part of Asia or a third part of the world. Division into three parts eventually came to predominate. From the Greek viewpoint, the Aegean Sea was the center of the world; Asia lay to the east, Europe to the north and west, and Africa to the south. The boundaries between the continents were not fixed. Early on, the Europe–Asia boundary was taken to run from the Black Sea along the Rioni River (known then as the "Phasis") in Georgia. Later it was viewed as running from the Black Sea through Kerch Strait, the Sea of Azov and along the Don River (known then as the "Tanais") in Russia. The boundary between Asia and Africa was generally taken to be the Nile River. Herodotus in the 5th century BC objected to the whole of Egypt being split between Asia and Africa ("Libya") and took the boundary to lie along the western border of Egypt, regarding Egypt as part of Asia. He also questioned the division into three of what is really a single landmass, a debate that continues nearly two and a half millennia later. Eratosthenes, in the 3rd century BC, noted that some geographers divided the continents by rivers (the Nile and the Don), thus considering them "islands". Others divided the continents by isthmuses, calling the continents "peninsulas". These latter geographers set the border between Europe and Asia at the isthmus between the Black Sea and the Caspian Sea, and the border between Asia and Africa at the isthmus between the Red Sea and the mouth of Lake Bardawil on the Mediterranean Sea. Through the Roman period and the Middle Ages, a few writers took the Isthmus of Suez as the boundary between Asia and Africa, but most writers continued to consider it the Nile or the western border of Egypt (Gibbon). In the Middle Ages, the world was usually portrayed on T and O maps, with the T representing the waters dividing the three continents. By the middle of the 18th century, "the fashion of dividing Asia and Africa at the Nile, or at the Great Catabathmus [the boundary between Egypt and Libya] farther west, had even then scarcely passed away". Christopher Columbus sailed across the Atlantic Ocean to the West Indies in 1492, sparking a period of European exploration of the Americas. But despite four voyages to the Americas, Columbus never believed he had reached a new continent—he always thought it was part of Asia. In 1501, Amerigo Vespucci and Gonçalo Coelho attempted to sail around what they considered the southern end of the Asian mainland into the Indian Ocean, passing through Fernando de Noronha. After reaching the coast of Brazil, they sailed a long way further south along the coast of South America, confirming that this was a land of continental proportions and that it also extended much further south than Asia was known to. On return to Europe, an account of the voyage, called "Mundus Novus" ("New World"), was published under Vespucci's name in 1502 or 1503, although it seems that it had additions or alterations by another writer. Regardless of who penned the words, "Mundus Novus" credited Vespucci with saying, "I have discovered a continent in those southern regions that is inhabited by more numerous people and animals than our Europe, or Asia or Africa", the first known explicit identification of part of the Americas as a continent like the other three. Within a few years, the name "New World" began appearing as a name for South America on world maps, such as the Oliveriana (Pesaro) map of around 1504–1505. Maps of this time though, still showed North America connected to Asia and showed South America as a separate land. In 1507 Martin Waldseemüller published a world map, "Universalis Cosmographia", which was the first to show North and South America as separate from Asia and surrounded by water. A small inset map above the main map explicitly showed for the first time the Americas being east of Asia and separated from Asia by an ocean, as opposed to just placing the Americas on the left end of the map and Asia on the right end. In the accompanying book "Cosmographiae Introductio", Waldseemüller noted that the earth is divided into four parts, Europe, Asia, Africa and the fourth part, which he named "America" after Amerigo Vespucci's first name. On the map, the word "America" was placed on part of South America. From the 16th century the English noun "continent" was derived from the term "continent land", meaning continuous or connected land and translated from the Latin "terra continens". The noun was used to mean "a connected or continuous tract of land" or mainland. It was not applied only to very large areas of land—in the 17th century, references were made to the "continents" (or mainlands) of Isle of Man, Ireland and Wales and in 1745 to Sumatra. The word "continent" was used in translating Greek and Latin writings about the three "parts" of the world, although in the original languages no word of exactly the same meaning as "continent" was used. While "continent" was used on the one hand for relatively small areas of continuous land, on the other hand geographers again raised Herodotus's query about why a single large landmass should be divided into separate continents. In the mid-17th century, Peter Heylin wrote in his "Cosmographie" that "A Continent is a great quantity of Land, not separated by any Sea from the rest of the World, as the whole Continent of Europe, Asia, Africa." In 1727, Ephraim Chambers wrote in his "Cyclopædia," "The world is ordinarily divided into two grand continents: the old and the new." And in his 1752 atlas, Emanuel Bowen defined a continent as "a large space of dry land comprehending many countries all joined together, without any separation by water. Thus Europe, Asia, and Africa is one great continent, as America is another." However, the old idea of Europe, Asia and Africa as "parts" of the world ultimately persisted with these being regarded as separate continents. From the late 18th century, some geographers started to regard North America and South America as two parts of the world, making five parts in total. Overall though, the fourfold division prevailed well into the 19th century. Europeans discovered Australia in 1606, but for some time it was taken as part of Asia. By the late 18th century, some geographers considered it a continent in its own right, making it the sixth (or fifth for those still taking America as a single continent). In 1813, Samuel Butler wrote of Australia as "New Holland, an immense island, which some geographers dignify with the appellation of another continent" and the "Oxford English Dictionary" was just as equivocal some decades later. It was in the 1950s that the concept of Oceania as a "great division" of the world was replaced by the concept of Australia as a continent. Antarctica was sighted in 1820 during the First Russian Antarctic Expedition and described as a continent by Charles Wilkes on the United States Exploring Expedition in 1838, the last continent identified, although a great "Antarctic" (antipodean) landmass had been anticipated for millennia. An 1849 atlas labelled Antarctica as a continent but few atlases did so until after World War II. From the mid-19th century, atlases published in the United States more commonly treated North and South America as separate continents, while atlases published in Europe usually considered them one continent. However, it was still not uncommon for American atlases to treat them as one continent up until World War II. From the 1950s, most U.S. geographers divided the Americas into two continents. With the addition of Antarctica, this made the seven-continent model. However, this division of the Americas never appealed to Latin Americans, who saw their region spanning an as a single landmass, and there the conception of six continents remains dominant, as it does in scattered other countries. Some geographers regard Europe and Asia together as a single continent, dubbed "Eurasia". In this model, the world is divided into six continents, with North America and South America considered separate continents. Geologists use the term "continent" in a different manner from geographers. In geology a continent is defined by continental crust: a platform of metamorphic and igneous rock, largely of granitic composition. Some geologists restrict the term 'continent' to portions of the crust built around stable Precambrian "shield", typically 1.5 to 3.8 billion years old, called a craton. The craton itself is an accretionary complex of ancient mobile belts (mountain belts) from earlier cycles of subduction, continental collision and break-up from plate tectonic activity. An outward-thickening veneer of younger minimally deformed sedimentary rock covers much of the craton. The margins of geologic continents are characterized by currently active or relatively recently active mobile belts and deep troughs of accumulated marine or deltaic sediments. Beyond the margin, there is either a continental shelf and drop off to the basaltic ocean basin or the margin of another continent, depending on the current plate-tectonic setting of the continent. A continental boundary does not have to be a body of water. Over geologic time, continents are periodically submerged under large epicontinental seas, and continental collisions result in a continent becoming attached to another continent. The current geologic era is relatively anomalous in that so much of the continental areas are "high and dry"; that is, many parts of the continents that were once below sea level are now elevated well above it due to changes in sea levels and the subsequent uplifting of those continental areas from tectonic activity. Some argue that continents are accretionary crustal "rafts" that, unlike the denser basaltic crust of the ocean basins, are not subjected to destruction through the plate tectonic process of subduction. This accounts for the great age of the rocks comprising the continental cratons. By this definition, Eastern Europe, India and some other regions could be regarded as continental masses distinct from the rest of Eurasia because they have separate ancient shield areas (i.e. East European craton and Indian craton). Younger mobile belts (such as the Ural Mountains and Himalayas) mark the boundaries between these regions and the rest of Eurasia. There are many microcontinents, or continental fragments, that are built of continental crust but do not contain a craton. Some of these are fragments of Gondwana or other ancient cratonic continents: Zealandia, which includes New Zealand and New Caledonia; Madagascar; the northern Mascarene Plateau, which includes the Seychelles. Other islands, such as several in the Caribbean Sea, are composed largely of granitic rock as well, but all continents contain both granitic and basaltic crust, and there is no clear boundary as to which islands would be considered microcontinents under such a definition. The Kerguelen Plateau, for example, is largely volcanic, but is associated with the breakup of Gondwanaland and is considered a microcontinent, whereas volcanic Iceland and Hawaii are not. The British Isles, Sri Lanka, Borneo, and Newfoundland are margins of the Laurasian continent—only separated by inland seas flooding its margins. Plate tectonics offers yet another way of defining continents. Today, Europe and most of Asia constitute the unified Eurasian Plate, which is approximately coincident with the geographic Eurasian continent excluding India, Arabia, and far eastern Russia. India contains a central shield, and the geologically recent Himalaya mobile belt forms its northern margin. North America and South America are separate continents, the connecting isthmus being largely the result of volcanism from relatively recent subduction tectonics. North American continental rocks extend to Greenland (a portion of the Canadian Shield), and in terms of plate boundaries, the North American plate includes the easternmost portion of the Asian landmass. Geologists do not use these facts to suggest that eastern Asia is part of the North American continent, even though the plate boundary extends there; the word continent is usually used in its geographic sense and additional definitions ("continental rocks," "plate boundaries") are used as appropriate. The movement of plates has caused the formation and break-up of continents over time, including occasional formation of a supercontinent that contains most or all of the continents. The supercontinent Columbia or Nuna formed during a period of 2.0–1.8 billion years ago and broke up about 1.5–1.3 billion years ago. The supercontinent Rodinia is thought to have formed about 1 billion years ago and to have embodied most or all of Earth's continents, and broken up into eight continents around 600 million years ago. The eight continents later re-assembled into another supercontinent called Pangaea; Pangaea broke up into Laurasia (which became North America and Eurasia) and Gondwana (which became the remaining continents). The following table lists the seven continents with their highest and lowest points on land, sorted in decreasing highest points. † The lowest exposed points are given for North America and Antarctica. The lowest non-submarine bedrock elevations in these continents are the trough beneath Jakobshavn Glacier, at and Bentley Subglacial Trench, at, but these are covered by kilometres of ice. †† Claimed by Australia as part of Australian Antarctic Territory, but this claim is not widely recognised. Some sources list the Kuma–Manych Depression (a remnant of the Paratethys) as the geological border between Europe and Asia. This would place the Caucasus outside of Europe, thus making Mont Blanc (elevation 4810 m) in the Graian Alps the highest point in Europe – the lowest point would still be the shore of the Caspian Sea.
A continent is one of several very large landmasses. Generally identified by convention rather than any strict criteria, up to seven regions are commonly regarded as continents. Ordered from largest in area to smallest, these seven regions are: Asia, Africa, North America, South America, Antarctica, Europe, and Australia. Variations with fewer continents may merge some of these, for example some systems include Eurasia or America as single continents.
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summarize: According to Jammer, the term "work" was introduced in 1826 by the French mathematician Gaspard-Gustave Coriolis as "weight "lifted" through a height", which is based on the use of early steam engines to lift buckets of water out of flooded ore mines. According to Rene Dugas, French engineer and historian, it is to Solomon of Caux "that we owe the term "work" in the sense that it is used in mechanics now". The SI unit of work is the joule (J), which is defined as the work expended by a force of one newton through a displacement of one metre. The dimensionally equivalent newton-metre (N⋅m) is sometimes used as the measuring unit for work, but this can be confused with the unit newton-metre, which is the measurement unit of torque. Usage of N⋅m is discouraged by the SI authority, since it can lead to confusion as to whether the quantity expressed in newton metres is a torque measurement, or a measurement of work. Non-SI units of work include the newton-metre, erg, the foot-pound, the foot-poundal, the kilowatt hour, the litre-atmosphere, and the horsepower-hour. Due to work having the same physical dimension as heat, occasionally measurement units typically reserved for heat or energy content, such as therm, BTU and Calorie, are utilized as a measuring unit. The work formula_3 done by a constant force of magnitude formula_1 on a point that moves a displacement formula_2 in a straight line in the direction of the force is the product For example, if a force of 10 newtons (formula_1 = 10 N) acts along a point that travels 2 metres (formula_2 = 2 m), then formula_9 This is approximately the work done lifting a 1 kg object from ground level to over a person's head against the force of gravity. The work is doubled either by lifting twice the weight the same distance or by lifting the same weight twice the distance. Work is closely related to energy. The work-energy principle states that an increase in the kinetic energy of a rigid body is caused by an equal amount of positive work done on the body by the resultant force acting on that body. Conversely, a decrease in kinetic energy is caused by an equal amount of negative work done by the resultant force. From Newton's second law, it can be shown that work on a free (no fields), rigid (no internal degrees of freedom) body, is equal to the change in kinetic energy formula_10 of the linear velocity and angular velocity of that body, The work of forces generated by a potential function is known as potential energy and the forces are said to be conservative. Therefore, work on an object that is merely displaced in a conservative force field, without change in velocity or rotation, is equal to "minus" the change of potential energy formula_12 of the object, These formulas show that work is the energy associated with the action of a force, so work subsequently possesses the physical dimensions, and units, of energy. The work/energy principles discussed here are identical to Electric work/energy principles. Constraint forces limit the movement of components in a system, such as constraining an object to a surface (in the case of a slope plus gravity, the object is "stuck to" the slope, when attached to a taut string it cannot move in an outwards direction to make the string any 'tauter'). Constraint forces restrict the velocity in the direction of the constraint to zero, which means the constraint forces do not perform work on the system. For a mechanical system, constraint forces eliminate movement in directions that characterize the constraint. Thus constraint forces do not perform work on the system, because the component of velocity along the constraint force at each point of application is zero. For example, in a pulley system like the Atwood machine, the internal forces on the rope and at the supporting pulley do no work on the system. Therefore work need only be computed for the gravitational forces acting on the bodies. For example, the centripetal force exerted "inwards" by a string on a ball in uniform circular motion "sideways" constrains the ball to circular motion restricting its movement away from the centre of the circle. This force does zero work because it is perpendicular to the velocity of the ball. Another example is a book on a table. If external forces are applied to the book so that it slides on the table, then the force exerted by the table constrains the book from moving downwards. The force exerted by the table supports the book and is perpendicular to its movement which means that this constraint force does not perform work. The magnetic force on a charged particle is, where "q" is the charge, v is the velocity of the particle, and B is the magnetic field. The result of a cross product is always perpendicular to both of the original vectors, so. The dot product of two perpendicular vectors is always zero, so the work, and the magnetic force does not do work. It can change the direction of motion but never change the speed. For moving objects, the quantity of work/time (power) is integrated along the trajectory of the point of application of the force. Thus, at any instant, the rate of the work done by a force (measured in joules/second, or watts) is the scalar product of the force (a vector), and the velocity vector of the point of application. This scalar product of force and velocity is known as instantaneous power. Just as velocities may be integrated over time to obtain a total distance, by the fundamental theorem of calculus, the total work along a path is similarly the time-integral of instantaneous power applied along the trajectory of the point of application. Work is the result of a force on a point that follows a curve X, with a velocity v, at each instant. The small amount of work "δW" that occurs over an instant of time "dt" is calculated as where the is the power over the instant "dt". The sum of these small amounts of work over the trajectory of the point yields the work, where "C" is the trajectory from x("t") to x("t"). This integral is computed along the trajectory of the particle, and is therefore said to be "path dependent". If the force is always directed along this line, and the magnitude of the force is "F", then this integral simplifies to where "s" is displacement along the line. If F is constant, in addition to being directed along the line, then the integral simplifies further to where "s" is the displacement of the point along the line. This calculation can be generalized for a constant force that is not directed along the line, followed by the particle. In this case the dot product, where "θ" is the angle between the force vector and the direction of movement, that is In the notable case of a force applied to a body always at an angle of 90° from the velocity vector (as when a body moves in a circle under a central force), no work is done at all, since the cosine of 90 degrees is zero. Thus, no work can be performed by gravity on a planet with a circular orbit (this is ideal, as all orbits are slightly elliptical). Also, no work is done on a body moving circularly at a constant speed while constrained by mechanical force, such as moving at constant speed in a frictionless ideal centrifuge. Calculating the work as "force times straight path segment" would only apply in the most simple of circumstances, as noted above. If force is changing, or if the body is moving along a curved path, possibly rotating and not necessarily rigid, then only the path of the application point of the force is relevant for the work done, and only the component of the force parallel to the application point velocity is doing work (positive work when in the same direction, and negative when in the opposite direction of the velocity). This component of force can be described by the scalar quantity called "scalar tangential component" (formula_19, where formula_20 is the angle between the force and the velocity). And then the most general definition of work can be formulated as follows: formula_23 A force couple results from equal and opposite forces, acting on two different points of a rigid body. The sum (resultant) of these forces may cancel, but their effect on the body is the couple or torque T. The work of the torque is calculated as where the is the power over the instant "δt". The sum of these small amounts of work over the trajectory of the rigid body yields the work, This integral is computed along the trajectory of the rigid body with an angular velocity ω that varies with time, and is therefore said to be "path dependent". If the angular velocity vector maintains a constant direction, then it takes the form, where φ is the angle of rotation about the constant unit vector S. In this case, the work of the torque becomes, where "C" is the trajectory from "φ"("t") to "φ"("t"). This integral depends on the rotational trajectory "φ"("t"), and is therefore path-dependent. If the torque T is aligned with the angular velocity vector so that, and both the torque and angular velocity are constant, then the work takes the form, This result can be understood more simply by considering the torque as arising from a force of constant magnitude "F", being applied perpendicularly to a lever arm at a distance "r", as shown in the figure. This force will act through the distance along the circular arc, so the work done is Introduce the torque, to obtain as presented above. Notice that only the component of torque in the direction of the angular velocity vector contributes to the work. The scalar product of a force F and the velocity v of its point of application defines the power input to a system at an instant of time. Integration of this power over the trajectory of the point of application,, defines the work input to the system by the force. Therefore, the work done by a force F on an object that travels along a curve "C" is given by the line integral: where "dx"("t") defines the trajectory "C" and v is the velocity along this trajectory. In general this integral requires the path along which the velocity is defined, so the evaluation of work is said to be path dependent. The time derivative of the integral for work yields the instantaneous power, If the work for an applied force is independent of the path, then the work done by the force, by the gradient theorem, defines a potential function which is evaluated at the start and end of the trajectory of the point of application. This means that there is a potential function "U"(x), that can be evaluated at the two points x("t") and x("t") to obtain the work over any trajectory between these two points. It is tradition to define this function with a negative sign so that positive work is a reduction in the potential, that is The function "U"(x) is called the potential energy associated with the applied force. The force derived from such a potential function is said to be conservative. Examples of forces that have potential energies are gravity and spring forces. In this case, the gradient of work yields and the force F is said to be "derivable from a potential." Because the potential "U" defines a force F at every point x in space, the set of forces is called a force field. The power applied to a body by a force field is obtained from the gradient of the work, or potential, in the direction of the velocity V of the body, that is In the absence of other forces, gravity results in a constant downward acceleration of every freely moving object. Near Earth's surface the acceleration due to gravity is and the gravitational force on an object of mass "m" is. It is convenient to imagine this gravitational force concentrated at the center of mass of the object. If an object is displaced upwards or downwards a vertical distance, the work "W" done on the object by its weight mg is: where "F" is weight (pounds in imperial units, and newtons in SI units), and Δ"y" is the change in height "y". Notice that the work done by gravity depends only on the vertical movement of the object. The presence of friction does not affect the work done on the object by its weight. The force of gravity exerted by a mass "M" on another mass "m" is given by where r is the position vector from "M" to "m". Let the mass "m" move at the velocity v then the work of gravity on this mass as it moves from position r("t") to r("t") is given by Notice that the position and velocity of the mass "m" are given by where e and e are the radial and tangential unit vectors directed relative to the vector from "M" to "m". Use this to simplify the formula for work of gravity to, This calculation uses the fact that The function is the gravitational potential function, also known as gravitational potential energy. The negative sign follows the convention that work is gained from a loss of potential energy. Consider a spring that exerts a horizontal force that is proportional to its deflection in the "x" direction independent of how a body moves. The work of this spring on a body moving along the space with the curve, is calculated using its velocity,, to obtain For convenience, consider contact with the spring occurs at, then the integral of the product of the distance "x" and the x-velocity, "xv", is (1/2)"x". The velocity is not a factor here. The work is the product of the distance times the spring force, which is also dependent on distance; hence the "x" result. Where "P" is pressure, "V" is volume, and "a" and "b" are initial and final volumes. The principle of work and kinetic energy (also known as the work–energy principle) states that "the work done by all forces acting on a particle (the work of the resultant force) equals the change in the kinetic energy of the particle." That is, the work "W" done by the resultant force on a particle equals the change in the particle's kinetic energy formula_46, where formula_48 and formula_49 are the speeds of the particle before and after the work is done, and "m" is its mass. The derivation of the "work–energy principle" begins with Newton’s second law of motion and the resultant force on a particle. Computation of the scalar product of the forces with the velocity of the particle evaluates the instantaneous power added to the system. Constraints define the direction of movement of the particle by ensuring there is no component of velocity in the direction of the constraint force. This also means the constraint forces do not add to the instantaneous power. The time integral of this scalar equation yields work from the instantaneous power, and kinetic energy from the scalar product of velocity and acceleration. The fact that the work–energy principle eliminates the constraint forces underlies Lagrangian mechanics. This section focuses on the work–energy principle as it applies to particle dynamics. In more general systems work can change the potential energy of a mechanical device, the thermal energy in a thermal system, or the electrical energy in an electrical device. Work transfers energy from one place to another or one form to another. In the case the resultant force F is constant in both magnitude and direction, and parallel to the velocity of the particle, the particle is moving with constant acceleration "a" along a straight line. The relation between the net force and the acceleration is given by the equation "F" = "ma" (Newton's second law), and the particle displacement "s" can be expressed by the equation which follows from formula_51 (see Equations of motion). The work of the net force is calculated as the product of its magnitude and the particle displacement. Substituting the above equations, one obtains: Other derivation: Vertical displacement derivation "W = F × S = mg × h" In the general case of rectilinear motion, when the net force F is not constant in magnitude, but is constant in direction, and parallel to the velocity of the particle, the work must be integrated along the path of the particle: For any net force acting on a particle moving along any curvilinear path, it can be demonstrated that its work equals the change in the kinetic energy of the particle by a simple derivation analogous to the equation above. Some authors call this result "work–energy principle", but it is more widely known as the work–energy theorem: The identity formula_58 requires some algebra. From the identity formula_59 and definition formula_60 it follows The remaining part of the above derivation is just simple calculus, same as in the preceding rectilinear case. In particle dynamics, a formula equating work applied to a system to its change in kinetic energy is obtained as a first integral of Newton's second law of motion. It is useful to notice that the resultant force used in Newton's laws can be separated into forces that are applied to the particle and forces imposed by constraints on the movement of the particle. Remarkably, the work of a constraint force is zero, therefore only the work of the applied forces need be considered in the work–energy principle. To see this, consider a particle P that follows the trajectory X("t") with a force F acting on it. Isolate the particle from its environment to expose constraint forces R, then Newton's Law takes the form where "m" is the mass of the particle. Note that n dots above a vector indicates its nth time derivative. The scalar product of each side of Newton's law with the velocity vector yields because the constraint forces are perpendicular to the particle velocity. Integrate this equation along its trajectory from the point X("t") to the point X("t") to obtain The left side of this equation is the work of the applied force as it acts on the particle along the trajectory from time "t" to time "t". This can also be written as This integral is computed along the trajectory X("t") of the particle and is therefore path dependent. The right side of the first integral of Newton's equations can be simplified using the following identity (see product rule for derivation). Now it is integrated explicitly to obtain the change in kinetic energy, where the kinetic energy of the particle is defined by the scalar quantity, It is useful to resolve the velocity and acceleration vectors into tangential and normal components along the trajectory X("t"), such that where Then, the scalar product of velocity with acceleration in Newton's second law takes the form where the kinetic energy of the particle is defined by the scalar quantity, The result is the work–energy principle for particle dynamics, This derivation can be generalized to arbitrary rigid body systems. Consider the case of a vehicle moving along a straight horizontal trajectory under the action of a driving force and gravity that sum to F. The constraint forces between the vehicle and the road define R, and we have For convenience let the trajectory be along the X-axis, so and the velocity is, then, and, where "F" is the component of F along the X-axis, so Integration of both sides yields If F is constant along the trajectory, then the integral of velocity is distance, so As an example consider a car skidding to a stop, where "k" is the coefficient of friction and "W" is the weight of the car. Then the force along the trajectory is. The velocity "v" of the car can be determined from the length "s" of the skid using the work–energy principle, Notice that this formula uses the fact that the mass of the vehicle is. Consider the case of a vehicle that starts at rest and coasts down a mountain road, the work-energy principle helps compute the minimum distance that the vehicle travels to reach a velocity "V", of say 60 mph (88 fps). Rolling resistance and air drag will slow the vehicle down so the actual distance will be greater than if these forces are neglected. Let the trajectory of the vehicle following the road be X("t") which is a curve in three-dimensional space. The force acting on the vehicle that pushes it down the road is the constant force of gravity, while the force of the road on the vehicle is the constraint force R. Newton's second law yields, The scalar product of this equation with the velocity,, yields where "V" is the magnitude of V. The constraint forces between the vehicle and the road cancel from this equation because, which means they do no work. Integrate both sides to obtain The weight force "W" is constant along the trajectory and the integral of the vertical velocity is the vertical distance, therefore, Recall that V(t)=0. Notice that this result does not depend on the shape of the road followed by the vehicle. In order to determine the distance along the road assume the downgrade is 6%, which is a steep road. This means the altitude decreases 6 feet for every 100 feet traveled—for angles this small the sin and tan functions are approximately equal. Therefore, the distance "s" in feet down a 6% grade to reach the velocity "V" is at least This formula uses the fact that the weight of the vehicle is. The work of forces acting at various points on a single rigid body can be calculated from the work of a resultant force and torque. To see this, let the forces F, F... F act on the points X, X... X in a rigid body. The trajectories of X, "i" = 1,..., "n" are defined by the movement of the rigid body. This movement is given by the set of rotations ["A"("t")] and the trajectory d("t") of a reference point in the body. Let the coordinates x "i" = 1,..., "n" define these points in the moving rigid body's reference frame "M", so that the trajectories traced in the fixed frame "F" are given by The velocity of the points X along their trajectories are where ω is the angular velocity vector obtained from the skew symmetric matrix known as the angular velocity matrix. The small amount of work by the forces over the small displacements "δ"r can be determined by approximating the displacement by so or This formula can be rewritten to obtain where F and T are the resultant force and torque applied at the reference point d of the moving frame "M" in the rigid body.
In physics, work is the product of force and displacement. A force is said to do positive work if (when applied) the force has a component in the direction of the displacement of the point of application. A force does negative work if the force has a component opposite to the direction of the displacement at the point of application of the force.
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summarize: The template for all modern computers is the Von Neumann architecture, detailed in a 1945 paper by Hungarian mathematician John von Neumann. This describes a design architecture for an electronic digital computer with subdivisions of a processing unit consisting of an arithmetic logic unit and processor registers, a control unit containing an instruction register and program counter, a memory to store both data and instructions, external mass storage, and input and output mechanisms. The meaning of the term has evolved to mean a stored-program computer in which an instruction fetch and a data operation cannot occur at the same time because they share a common bus. This is referred to as the Von Neumann bottleneck and often limits the performance of the system. The personal computer is one of the most common types of computer due to its versatility and relatively low price. Desktop personal computers have a monitor, a keyboard, a mouse, and a computer case. The computer case holds the motherboard, fixed or removable disk drives for data storage, the power supply, and may contain other peripheral devices such as modems or network interfaces. Some models of desktop computers integrated the monitor and keyboard into the same case as the processor and power supply. Separating the elements allows the user to arrange the components in a pleasing, comfortable array, at the cost of managing power and data cables between them. Laptops are designed for portability but operate similarly to desktop PCs. They may use lower-power or reduced size components, with lower performance than a similarly priced desktop computer. Laptops contain the keyboard, display, and processor in one case. The monitor in the folding upper cover of the case can be closed for transportation, to protect the screen and keyboard. Instead of a mouse, laptops may have a trackpad or pointing stick. Tablets are portable computer that uses a "touchscreen" as the primary input device. Tablets generally weigh less and are smaller than laptops. Some tablets include fold out keyboards, or offer connections to separate external keyboards. The computer case encloses most of the components of the system. It provides mechanical support and protection for internal elements such as the motherboard, disk drives, and power supplies, and controls and directs the flow of cooling air over internal components. The case is also part of the system to control electromagnetic interference radiated by the computer and protects internal parts from electrostatic discharge. Large tower cases provide space for multiple disk drives or other peripherals and usually stand on the floor, while desktop cases provide less expansion room. All-in-one style designs include a video display built into the same case. Portable and laptop computers require cases that provide impact protection for the unit. A current development in laptop computers is a detachable keyboard, which allows the system to be configured as a touch-screen tablet. Hobbyists may decorate the cases with colored lights, paint, or other features, in an activity called case modding. A power supply unit (PSU) converts alternating current (AC) electric power to low-voltage direct current (DC) power for the computer. Laptops can run on built-in rechargeable battery. The PSU typically uses a switched-mode power supply (SMPS), with power MOSFETs (power metal–oxide–semiconductor field-effect transistors) used in the converters and regulator circuits of the SMPS. The motherboard is the main component of a computer. It is a board with integrated circuitry that connects the other parts of the computer including the CPU, the RAM, the disk drives (CD, DVD, hard disk, or any others) as well as any peripherals connected via the ports or the expansion slots. The integrated circuit (IC) chips in a computer typically contain billions of tiny metal–oxide–semiconductor field-effect transistors (MOSFETs). Components directly attached to or to part of the motherboard include: An expansion card in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard or backplane to add functionality to a computer system via the expansion bus. Expansion cards can be used to obtain or expand on features not offered by the motherboard. A storage device is any computing hardware and digital media that is used for storing, porting and extracting data files and objects. It can hold and store information both temporarily and permanently and can be internal or external to a computer, server or any similar computing device. Data storage is a core function and fundamental component of computers. Data is stored by a computer using a variety of media. Hard disk drives (HDDs) are found in virtually all older computers, due to their high capacity and low cost, but solid-state drives (SSDs) are faster and more power efficient, although currently more expensive than hard drives in terms of dollar per gigabyte, so are often found in personal computers built post-2007. SSDs use flash memory, which stores data on MOS memory chips consisting of floating-gate MOSFET memory cells. Some systems may use a disk array controller for greater performance or reliability. To transfer data between computers, an external flash memory device (such as a memory card or USB flash drive) or optical disc (such as a CD-ROM, DVD-ROM or BD-ROM) may be used. Their usefulness depends on being readable by other systems; the majority of machines have an optical disk drive (ODD), and virtually all have at least one Universal Serial Bus (USB) port. Input and output devices are typically housed externally to the main computer chassis. The following are either standard or very common to many computer systems. Input devices allow the user to enter information into the system, or control its operation. Most personal computers have a mouse and keyboard, but laptop systems typically use a touchpad instead of a mouse. Other input devices include webcams, microphones, joysticks, and image scanners. Output devices are designed around the senses of human beings. For example, monitors display text that can be read, speakers produce sound that can be heard. Such devices also could include printers or a Braille embosser. A mainframe computer is a much larger computer that typically fills a room and may cost many hundreds or thousands of times as much as a personal computer. They are designed to perform large numbers of calculations for governments and large enterprises. In the 1960s and 1970s, more and more departments started to use cheaper and dedicated systems for specific purposes like process control and laboratory automation. A minicomputer, or colloquially mini, is a class of smaller computers that was developed in the mid-1960's and sold for much less than mainframe and mid-size computers from IBM and its direct competitors. A supercomputer is superficially similar to a mainframe but is instead intended for extremely demanding computational tasks. As of June 2018, the fastest supercomputer on the TOP500 supercomputer list is the Summit, in the United States, with a LINPACK benchmark score of 122.3 PFLOPS Light, by around 29 PFLOPS. The term supercomputer does not refer to a specific technology. Rather it indicates the fastest computations available at any given time. In mid-2011, the fastest supercomputers boasted speeds exceeding one petaflop, or 1 quadrillion (10^15 or 1,000 trillion) floating-point operations per second. Supercomputers are fast but extremely costly, so they are generally used by large organizations to execute computationally demanding tasks involving large data sets. Supercomputers typically run military and scientific applications. Although costly, they are also being used for commercial applications where huge amounts of data must be analyzed. For example, large banks employ supercomputers to calculate the risks and returns of various investment strategies, and healthcare organizations use them to analyze giant databases of patient data to determine optimal treatments for various diseases and problems incurring to the country. When using computer hardware, an upgrade means adding new hardware to a computer that improves its performance, increases its capacity, or adds new features. For example, a user could perform a hardware upgrade to replace the hard drive with a faster one or an SSD to get a boost in performance. Also, the user could install more RAM so the computer may run more smoothly. The user could add a USB 3.0 expansion card to fully use USB 3.0 devices, or could upgrade the GPU for extra rendering power. Performing such hardware upgrades may be necessary for older computers to meet a program's system requirements. Global revenue from computer hardware in 2016 reached 408 billion Euros. Because computer parts contain hazardous materials, there is a growing movement to recycle old and outdated parts. Computer hardware contain dangerous chemicals such as: lead, mercury, nickel, and cadmium. According to the EPA these e-wastes have a harmful effect on the environment unless they are disposed of properly. Making hardware requires energy, and recycling parts will reduce air pollution, water pollution, as well as greenhouse gas emissions. Disposing unauthorized computer equipment is in fact illegal. Legislation makes it mandatory to recycle computers through the government approved facilities. Recycling a computer can be made easier by taking out certain reusable parts. For example, the RAM, DVD drive, the graphics card, hard drive or SSD, and other similar removable parts can be reused. Many materials used in computer hardware can be recovered by recycling for use in future production. Reuse of tin, silicon, iron, aluminium, and a variety of plastics that are present in bulk in computers or other electronics can reduce the costs of constructing new systems. Components frequently contain copper, gold, tantalum, silver, platinum, palladium, and lead as well as other valuable materials suitable for reclamation. The central processing unit contains many toxic materials. It contains lead and chromium in the metal plates. Resistors, semi-conductors, infrared detectors, stabilizers, cables, and wires contain cadmium. The circuit boards in a computer contain mercury, and chromium. When these types of materials, and chemicals are disposed improperly will become hazardous for the environment. According to the United States Environmental Protection Agency only around 15% of the e-waste actually is recycled. When e-waste byproducts leach into groundwater, are burned, or get mishandled during recycling, it causes harm. Health problems associated with such toxins include impaired mental development, cancer, and damage to the lungs, liver, and kidneys. That's why even wires have to be recycled. Different companies have different techniques to recycle a wire. The most popular one is the grinder that separates the copper wires from the plastic/rubber casing. When the processes are done there are two different piles left; one containing the copper powder, and the other containing plastic/rubber pieces. Computer monitors, mice, and keyboards all have a similar way of being recycled. For example, first, each of the parts are taken apart then all of the inner parts get separated and placed into its own bin. Computer components contain many toxic substances, like dioxins, polychlorinated biphenyls (PCBs), cadmium, chromium, radioactive isotopes and mercury. A typical computer monitor may contain more than 6% lead by weight, much of which is in the lead glass of the cathode ray tube (CRT). A typical 15 inch (38 cm) computer monitor may contain of lead but other monitors have been estimated to have up to of lead. Circuit boards contain considerable quantities of lead-tin solders that are more likely to leach into groundwater or create air pollution due to incineration. In US landfills, about 40% of the lead content levels are from e-waste. The processing (e.g. incineration and acid treatments) required to reclaim these precious substances may release, generate, or synthesize toxic byproducts. Recycling of computer hardware is considered environmentally friendly because it prevents hazardous waste, including heavy metals and carcinogens, from entering the atmosphere, landfill or waterways. While electronics consist a small fraction of total waste generated, they are far more dangerous. There is stringent legislation designed to enforce and encourage the sustainable disposal of appliances, the most notable being the Waste Electrical and Electronic Equipment Directive of the European Union and the United States National Computer Recycling Act. As computer hardware contain a wide number of metals inside, the United States Environmental Protection Agency (EPA) encourages the collection and recycling of computer hardware. "E-cycling", the recycling of computer hardware, refers to the donation, reuse, shredding and general collection of used electronics. Generically, the term refers to the process of collecting, brokering, disassembling, repairing and recycling the components or metals contained in used or discarded electronic equipment, otherwise known as electronic waste (e-waste). "E-cyclable" items include, but are not limited to: televisions, computers, microwave ovens, vacuum cleaners, telephones and cellular phones, stereos, and VCRs and DVDs just about anything that has a cord, light or takes some kind of battery. Recycling a computer is made easier by a few of the national services, such as Dell and Apple. Both companies will take back the computer of their make or any other make. Otherwise a computer can be donated to Computer Aid International which is an organization that recycles and refurbishes old computers for hospitals, schools, universities, etc.
Computer hardware includes the physical parts of a computer, such as the case, central processing unit (CPU), monitor, mouse, keyboard, computer data storage, graphics card, sound card, speakers and motherboard.
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summarize: The English word "Germany" derives from the Latin, which came into use after Julius Caesar adopted it for the peoples east of the Rhine. The German term, originally ("the German lands") is derived from, descended Ancient humans were present in Germany at least 600,000 years ago. The first non-modern human fossil (the Neanderthal) was discovered in the Neander Valley. Similarly dated evidence of modern humans has been found in the Swabian Jura, including 42,000-year-old flutes which are the oldest musical instruments ever found, the 40,000-year-old Lion Man, and the 35,000-year-old Venus of Hohle Fels. The Nebra sky disk, created during the European Bronze Age, is attributed to a German site. The Germanic tribes are thought to date from the Nordic Bronze Age or the Pre-Roman Iron Age. From southern Scandinavia and north Germany, they expanded south, east and west, coming into contact with the Celtic, Iranian, Baltic, and Slavic tribes. Under Augustus, Rome began to invade Germania. In 9 AD, three Roman legions were defeated by Arminius. By 100 AD, when Tacitus Charlemagne founded the Carolingian Empire in 800; it was divided in 843 and the Holy Roman Empire emerged from the eastern portion. The territory initially known as East Francia stretched from the Rhine in the west to the Elbe River in the east and from the North Sea to the Alps. The Ottonian rulers (919–1024) consolidated several major duchies. In 996 Gregory V became the first German Pope, appointed by his cousin Otto III, whom he shortly after crowned Holy Roman Emperor. The Holy Roman Empire absorbed northern Italy and Burgundy under the Salian emperors (1024–1125), although the emperors lost power through the Investiture controversy. Under the Hohenstaufen emperors (1138–1254), German princes encouraged German settlement to the south and east "(Ostsiedlung)". Members of the Hanseatic League, mostly north German towns, prospered in the expansion of trade. Population declined starting with the Great Famine in 1315, followed by the Black Death of 1348–50. The Golden Bull issued in 1356 provided the constitutional structure of the Empire and codified the election of the emperor by seven prince-electors. Johannes Gutenberg Following the fall of Napoleon, the Congress of Vienna founded the German Confederation, a loose league of 39 sovereign states. The appointment of the Emperor of Austria as the permanent president reflected the Congress's rejection of Prussia's rising influence. Disagreement within restoration politics partly led to the rise of liberal movements, followed by new measures of repression by Austrian statesman Metternich. The "Zollverein", a tariff union, furthered economic unity. In light of revolutionary movements in Europe, intellectuals and commoners started the Revolutions of 1848 in the German states. King Frederick William IV of Prussia was offered the title of Emperor, but with a loss of power; he rejected the crown and the proposed constitution, a temporary setback for the movement. King William I appointed Otto von Bismarck as the Minister President of Prussia in 1862. Bismarck successfully concluded war on Denmark; the subsequent decisive Prussian victory in the Austro-Prussian War of 1866 enabled him to create the North German Confederation which excluded Austria. After the French defeat in the Franco-Prussian War, the German princes proclaimed the founding of the German Empire in 1871. Prussia was the dominant constituent state of the new empire; the On 11 August 1919, President Friedrich Ebert signed the democratic Weimar Constitution. In the subsequent struggle for power, Communists seized power in Bavaria, but conservative elements elsewhere attempted to overthrow the Republic in the Kapp Putsch. Street fighting in the major industrial centres, the occupation of the Ruhr by Belgian and French troops, and a period of hyperinflation followed. A debt restructuring plan and the creation of a new currency in 1924 ushered in the Golden Twenties, an era of artistic innovation and liberal cultural life. The worldwide Great Depression hit Germany in 1929. Chancellor After Nazi Germany surrendered, the Allies partitioned Berlin and Germany's remaining territory into four occupation zones. The western sectors, controlled by France, the United Kingdom, and the United States, were merged on 23 May 1949 to form the Federal Republic of Germany ("Bundesrepublik Deutschland (BRD)"); on 7 October 1949, the Soviet Zone became the German Democratic Republic ("Deutsche Demokratische Republik (DDR)"). They were informally known as West Germany and East Germany. East Germany selected East Berlin as its capital, while West Germany chose Bonn as a provisional capital, to emphasise its stance that the two-state solution was temporary. West Germany was established as a federal parliamentary republic with a "social market economy". Starting in 1948 West Germany became a major recipient of reconstruction aid under the Marshall Plan. Konrad Adenauer was elected the first Federal Chancellor of Germany in 1949. The country enjoyed prolonged economic growth ("Wirtschaftswunder") beginning in the early 1950s. West Germany joined NATO in 1955 and was a founding member of the European Economic Community. East Germany was United Germany was considered the enlarged continuation of West Germany so it retained its memberships in international organisations. Based on the Berlin/Bonn Act (1994), Berlin again became the capital of Germany, while Bonn obtained the unique status of a "Bundesstadt" (federal city) retaining some federal ministries. The relocation of the government was completed in 1999, and modernisation of the east German economy was scheduled to last until 2019. Since reunification, Germany has taken a more active role in the European Union, signing the Maastricht Treaty in 1992 and the Lisbon Treaty in 2007, and co-founding Germany is in Western and Central Europe, bordering Denmark to the north, Poland and the Czech Republic to the east, Austria to the southeast, and Switzerland to the south-southwest. France, Luxembourg and Belgium are situated to the west, with the Netherlands to the northwest. Germany is also bordered by the North Sea and, at the north-northeast, by the Baltic Sea. German territory covers, consisting of of land and of water. It is the seventh largest country by area in Europe and the 62nd largest in the world. Elevation ranges from the mountains of the Alps (highest point: the Zugspitze at ) in the south to the shores of the North Sea ("Nordsee") in the northwest and the Baltic Sea ("Ostsee") in the northeast. The forested uplands of central Germany and the lowlands of northern Germany (lowest point: Wilstermarsch at below sea level) are traversed by such major rivers as the Rhine, Danube and Elbe. Significant natural resources include iron ore, coal, potash, timber, lignite, uranium, copper, natural gas, salt, and nickel. Most of Germany has a temperate climate, ranging from oceanic in the north to continental in the east and southeast. Winters range from cold in the southern Alps to mild and are generally overcast with limited precipitation, while summers can vary from hot and dry to cool and rainy. The northern regions have prevailing westerly winds that The territory of Germany can be divided into two ecoregions: European-Mediterranean montane mixed forests and Northeast-Atlantic shelf marine. 51% of Germany's land area is devoted to agriculture, while 30% is forested and 14% is covered by settlements or infrastructure. Plants and animals include those generally common to Central Europe. According to the National Forest Inventory, beeches, oaks, and other deciduous trees constitute just over 40% of the forests; roughly 60% are conifers, particularly spruce and pine. There are many species of ferns, flowers, fungi, and mosses. Germany is a federal, parliamentary, representative democratic republic. Federal legislative power is vested in the parliament consisting of the "Bundestag" (Federal Diet) and "Bundesrat" (Federal Council), which together form the legislative body. The "Bundestag" is elected through direct elections: half by majority vote and half by proportional representation. The members of the "Bundesrat" represent and are appointed by the governments of the sixteen federated states. The German political system operates under a framework laid out in the 1949 constitution known as the "Grundgesetz" (Basic Law). Amendments generally require a two-thirds majority of both the "Bundestag" and the "Bundesrat"; the fundamental principles of the constitution, as expressed in the articles guaranteeing human dignity, the separation of powers, the federal structure, and the rule of law, are valid in perpetuity. The president, currently Frank-Walter Steinmeier, is the head of state and invested primarily with representative responsibilities and powers. He is elected by the "Bundesversammlung" (federal convention), an institution consisting of the members of the "Bundestag" and an equal number of state delegates. The second-highest official in the German order of precedence is the "Bundestagspräsident" (president of the "Bundestag"), who is elected by the "Bundestag" and responsible for overseeing the daily sessions of the body. The third-highest official and the head of government is the chancellor, who is appointed by the "Bundespräsident" after being elected by the party or coalition with the most seats in the "Bundestag". The chancellor, currently Angela Merkel, is the head of government and exercises executive power through their Cabinet. Since 1949, the party system has been dominated by the Christian Democratic Union and the Social Democratic Party of Germany. So far every chancellor has been a member of one of these parties. However, the smaller liberal Free Democratic Party and the Alliance '90/The Greens have also achieved some success. Since 2007, the left-wing populist party The Left has been a staple in the German "Bundestag", though they have never been part of the federal government. In the 2017 German federal election, the right-wing populist Alternative for Germany gained enough votes to attain representation in the parliament for the first time. Germany comprises sixteen federal states which are collectively referred to as "Bundesländer". Each state has its own state constitution, and Germany has a civil law system based on Roman law with some references to Germanic law. The "Bundesverfassungsgericht" (Federal Constitutional Court) is the German Supreme Court responsible for constitutional matters, with power of judicial review. Germany's supreme court system is specialised: for civil and criminal cases, the highest court of appeal is the inquisitorial Federal Court of Justice, and for other affairs the courts are the Federal Labour Court, the Federal Germany has a network of 227 diplomatic missions abroad and maintains relations with more than 190 countries. Germany is a member of NATO, the OECD, the G8, the G20, the World Bank and the IMF. It has played an influential role in the European Union since its inception and has maintained a strong alliance with France and all neighbouring countries since 1990. Germany promotes the creation Germany's military, the "Bundeswehr", is organised into "Heer" (Army and special forces KSK), "Marine" (Navy), "Luftwaffe" (Air Force), "Bundeswehr Joint Medical Service" and "Streitkräftebasis" (Joint Support Service) branches. In absolute terms, German military expenditure is the 8th highest in the world. In 2018, military spending was at $49.5 billion, about 1.2% of the country's GDP, well below the NATO target of 2%., the "Bundeswehr" has a strength of 184,001 active soldiers and 80,947 civilians. Reservists are available to the Armed Forces and participate in defence exercises and deployments abroad. Until 2011, military service was compulsory for men at age 18, but this has been officially suspended Germany has a social market economy with a highly skilled labour force, a low level of corruption, and a high level of innovation. It is the world's third largest exporter of goods, and has the largest national economy in Europe which is also the world's fourth largest by nominal GDP and the fifth by PPP. Its GDP per capita measured in purchasing power standards amounts to 121% of the EU27 average (100%). The service sector contributes approximately 69% of the total GDP, industry 31%, and agriculture 1%. The unemployment rate published by Eurostat amounts to 3.2%, which is the fourth-lowest in the EU. Germany is part of the European single market which represents more than 450 million consumers. In 2017, the country accounted for 28% of the Eurozone economy according to the International Monetary Fund. Germany introduced the common European currency, the Euro, in 2002. Its monetary policy is set by the European Central Bank, which is headquartered in Frankfurt. Being home to the modern car, the automotive industry in Germany is regarded as one of the most competitive and innovative in the world, and is the fourth largest by production. The top 10 exports of Germany are vehicles, machinery, chemical goods, electronic products, electrical equipments, pharmaceuticals, transport equipments, basic metals, food products, and rubber and plastics. Germany is one of the largest exporters globally. Of the world's 500 largest stock-market-listed companies measured by revenue in 2019, the Fortune Global 500, 29 are headquartered in Germany. 30 major Germany-based companies are included in the DAX, the German stock market index which is operated by Frankfurt Stock Exchange. Well-known international brands include Mercedes-Benz, BMW, Volkswagen, Audi, Siemens, Allianz, Adidas, Porsche, Bosch and Deutsche Telekom. Berlin is a hub for startup companies and has become the leading location for venture capital funded firms in the European Union. Germany is recognised for its large portion of specialised small and medium enterprises, known as the "Mittelstand" model. These companies represent 48% global market leaders in their segments, labelled Hidden Champions. Research and development efforts form an integral part of the German economy. The In 2018 Germany ranked fourth globally in terms of number of science and engineering research papers published. Research institutions in Germany include the Max Planck Society, the Helmholtz Association, and the Fraunhofer Society and the Leibniz Association. Germany is the largest contributor to the European Space Agency. With a population of 80.2 million according to the 2011 census, rising to 83.1 million, Germany is the most populous country in the European Union, the second most populous country in Europe after Russia, and the 19th most populous country in the world. Its population density stands at 227 inhabitants per square kilometre (588 per square mile). The overall life expectancy in Germany at birth is 80.19 years (77.93 years for males and 82.58 years for females). The fertility rate of 1.41 children born per woman (2011 estimates) is below the replacement rate of 2.1 and is one of the lowest fertility rates in the world. Since the 1970s, Germany's death rate has exceeded its birth rate. However, Germany is witnessing increased birth rates and migration rates since the beginning of the 2010s, particularly a rise in the number of well-educated migrants. Germany has the third oldest population in the world, with the average age of 47.4 years. Four sizeable groups of people are referred to as "national minorities" because their ancestors have lived in their respective regions for centuries: There is a Danish minority in the northernmost state of Schleswig-Holstein; the Sorbs, a Slavic population, are in the Lusatia region of Saxony and Brandenburg.; the Roma and Sinti live throughout the country; and the Frisians are concentrated in Schleswig-Holstein's western coast and in the north-western part of Lower Saxony. After the United States, Germany is the second most popular immigration destination in the world. The majority of migrants live in western Germany, in particular in urban areas. Of the country's residents, 18.6 million people (22.5%) were of immigrant or partially immigrant descent in 2016 (including persons descending or partially descending from ethnic German repatriates). In 2015, the Population Division of the United Nations Department of Economic and Social Affairs listed Germany as host to the second-highest number of international migrants worldwide, about 5% or 12 million of all 244 million migrants., Germany ranks fifth amongst EU countries in terms of the percentage of migrants in the country's population, at 12.9%. Germany has a number of large cities. There are 11 officially recognised metropolitan regions. The country's largest city is Berlin, while its largest urban area is the Ruhr. The 2011 German Census showed Christianity as the largest religion in Germany, with 66.8% identified themselves as Christian, with 3.8% of those not being church members. 31.7% declared themselves as Protestants, including members of the Evangelical Church in Germany (which encompasses Lutheran, Reformed and administrative or confessional unions of both traditions) and the free churches (); 31.2% declared themselves as Roman Catholics, and Orthodox believers constituted 1.3%. According to data from 2016, the Catholic Church and the Evangelical Church claimed 28.5% and 27.5%, respectively, of the population. Islam is the second largest religion in German is the official and predominant spoken language in Germany. It is one of 24 official and working languages of the European Union, and one of the three working languages of the European Commission. German is the most widely spoken first language in the European Union, with around 100 million Responsibility for educational supervision in Germany is primarily organised within the individual federal states. Optional kindergarten education is provided for all children between three and six years old, after which school attendance is compulsory for at least nine years. Primary education usually lasts for four to six years. Secondary education includes three traditional types of schools focused on different academic levels: the "Gymnasium" enrols the most gifted children and prepares students for university studies; the "Realschule" for intermediate students lasts six years and the "Hauptschule" prepares pupils for vocational education. The "Gesamtschule" unifies all secondary education. A Germany's system of hospitals, called "Krankenhäuser", dates from medieval times, and today, Germany has the world's oldest universal health care system, dating from Bismarck's social legislation of the 1880s. Since the 1880s, reforms and provisions have ensured a balanced health care system. The population is covered by a health insurance plan provided by statute, with criteria allowing some groups to opt for a private health insurance contract. According Culture in German states has been shaped by major intellectual and popular currents in Europe, both religious and secular. Historically, Germany has been called "Das Land der Dichter und Denker" ("the land of poets and thinkers"), because of the major role its writers and philosophers have played in the development of Western thought. A global opinion poll for the BBC revealed that Germany is recognised for having the most positive influence in the world in 2013 and 2014. Germany is well known for such folk festival traditions as Oktoberfest and Christmas customs, which include Advent wreaths, Christmas pageants, Christmas trees, Stollen cakes, and other practices. UNESCO inscribed 41 properties in Germany on the World Heritage List. There are a number of public holidays in Germany determined by each state; 3 October has been a national day of Germany since 1990, celebrated as the "Tag der Deutschen Einheit" (German Unity Day). German classical music includes works by some of the world's most well-known composers. Dieterich Buxtehude, Johann Sebastian Bach and Georg Friedrich Händel were influential composers of the Baroque period. Ludwig van Beethoven was a crucial figure in the transition between the Classical and Romantic eras. Carl Maria von Weber, Felix Mendelssohn, Robert Schumann and Johannes Brahms were significant Romantic composers. Richard Wagner was known for his operas. Richard Strauss was a leading German painters have influenced western art. Albrecht Dürer, Hans Holbein the Younger, Matthias Grünewald and Lucas Cranach the Elder were important German artists of the Renaissance, Peter Paul Rubens and Johann Baptist Zimmermann of the Baroque, Caspar David Friedrich and Carl Spitzweg of Romanticism, Max Liebermann of Impressionism and Max Ernst of Surrealism. Several German art groups formed in the 20th century; "Die Brücke" (The Bridge) and "Der Blaue Reiter" (The Blue Rider) influenced the development of expressionism in Munich and Berlin. The New Objectivity arose in response to expressionism during the Weimar Republic. After World War II, broad trends in German art include neo-expressionism, performance art and conceptual art. Architectural contributions from Germany include the Carolingian and Ottonian styles, which were precursors of Romanesque. Brick Gothic is a distinctive medieval style that evolved in Germany. Also in Renaissance and Baroque art, regional and typically German elements evolved (e.g. Weser Renaissance and "Dresden Baroque"). The Wessobrunner School exerted a decisive influence on, and at times even dominated, the art of stucco in southern Germany in the German literature can be traced back to the Middle Ages and the works of writers such as Walther von der Vogelweide and Wolfram von Eschenbach. Well-known German authors include Johann Wolfgang von Goethe, Friedrich Schiller, Gotthold Ephraim Lessing and Theodor Fontane. The collections of folk tales published by the Brothers Grimm popularised German folklore on an international level. The Grimms also gathered and codified regional variants of the German language, grounding their work in historical principles; their "Deutsches Wörterbuch", or German Dictionary, sometimes called the Grimm dictionary, was begun in 1838 and the first volumes published in 1854. Influential authors of The largest internationally operating media companies in Germany are the Bertelsmann enterprise, Axel Springer SE and ProSiebenSat.1 Media. Germany's television market is the largest in Europe, with some 38 million TV households. Around 90% of German households have cable or satellite TV, with a variety of free-to-view public and commercial channels. There are more than 300 public and private radio stations in Germany; Germany's national radio network is the Deutschlandradio and the public Deutsche Welle is the main German radio and television broadcaster in foreign languages. Germany's print market of newspapers and magazines is the largest in Europe. The papers with the highest circulation are "Bild", "Süddeutsche Zeitung", "Frankfurter Allgemeine Zeitung" and "Die Welt". The largest magazines include "ADAC Motorwelt" and "Der Spiegel". Germany has a large video gaming market, with over 34 million players nationwide. German cinema has made major technical and artistic contributions to film. The first works of the Skladanowsky Brothers were shown German cuisine varies from region to region and often neighbouring regions share some culinary similarities (e.g. the southern regions of Bavaria and Swabia share some traditions with Switzerland and Austria). International varieties such as pizza, sushi, Chinese food, Greek food, Indian cuisine and doner kebab are also popular. Bread is a significant part of German cuisine and German bakeries produce about 600 main types of bread and 1,200 types of pastries and rolls ("Brötchen"). Association football is the most popular sport in Germany. With more than 7 million official members, the German Football Association ("Deutscher Fußball-Bund") is the largest single-sport organisation worldwide, and the German top league, the Bundesliga, attracts the second highest average attendance of all professional sports leagues in the world. The German men's national football team won the FIFA World Cup in 1954, 1974, 1990, and 2014, the UEFA European Championship in 1972, 1980 and 1996, and the FIFA Confederations Cup in 2017. Germany is one of the leading
Germany (, ), officially the Federal Republic of Germany (, ), is a country in Central and Western Europe. Covering an area of, it lies between the Baltic and North seas to the north, and the Alps to the south. It borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west.
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summarize: Programmable devices have existed for centuries. As early as the 9th century, a programmable music sequencer was invented by the Persian Banu Musa brothers, who described an automated mechanical flute player in the "Book of Ingenious Devices". In 1206, the Arab engineer Al-Jazari invented a programmable drum machine where musical mechanical automaton could be made to play different rhythms and drum patterns, via pegs and cams. In 1801, the Jacquard loom could produce entirely different weaves by changing the "program" – a series of pasteboard cards with holes punched in them. Code-breaking algorithms have also existed for centuries. In the 9th century, the Arab mathematician Al-Kindi described a cryptographic algorithm for deciphering encrypted code, in "A Manuscript On Deciphering Cryptographic Messages". He gave the first description of cryptanalysis by frequency analysis, the earliest code-breaking algorithm. The first computer program is generally dated to 1843, when mathematician Ada Lovelace published an algorithm to calculate a sequence of Bernoulli numbers, intended to be carried out by Charles Babbage's Analytical Engine. In the 1880s Herman Hollerith invented the concept of storing "data" in machine-readable form. Later a control panel (plugboard) added to his 1906 Type I Tabulator allowed it to be programmed for different jobs, and by the late 1940s, unit record equipment such as the IBM 602 and IBM 604, were programmed by control panels in a similar way; as were the first electronic computers. However, with the concept of the stored-program computers introduced in 1949, both programs and data were stored and manipulated in the same way in computer memory. Machine code was the language of early programs, written in the instruction set of the particular machine, often in binary notation. Assembly languages were soon developed that let the programmer specify instruction in a text format, (e.g., ADD X, TOTAL), with abbreviations for each operation code and meaningful names for specifying addresses. However, because an assembly language is little more than a different notation for a machine language, any two machines with different instruction sets also have different assembly languages. High-level languages made the process of developing a program simpler and more understandable, and less bound to the underlying hardware. FORTRAN, the first widely used high-level language to have a functional implementation, came out in 1957 and many other languages were soon developed – in particular, COBOL aimed at commercial data processing, and Lisp for computer research. Programs were mostly still entered using punched cards or paper tape. See computer programming in the punch card era. By the late 1960s, data storage devices and computer terminals became inexpensive enough that programs could be created by typing directly into the computers. Text editors (programs themselves) were developed that allowed changes and corrections to be made much more easily than with punched cards. Whatever the approach to development may be, the final program must satisfy some fundamental properties. The following properties are among the most important: In computer programming, readability refers to the ease with which a human reader can comprehend the purpose, control flow, and operation of source code. It affects the aspects of quality above, including portability, usability and most importantly maintainability. Readability is important because programmers spend the majority of their time reading, trying to understand and modifying existing source code, rather than writing new source code. Unreadable code often leads to bugs, inefficiencies, and duplicated code. A study found that a few simple readability transformations made code shorter and drastically reduced the time to understand it. Following a consistent programming style often helps readability. However, readability is more than just programming style. Many factors, having little or nothing to do with the ability of the computer to efficiently compile and execute the code, contribute to readability. Some of these factors include: The presentation aspects of this (such as indents, line breaks, color highlighting, and so on) are often handled by the source code editor, but the content aspects reflect the programmer's talent and skills. Various visual programming languages have also been developed with the intent to resolve readability concerns by adopting non-traditional approaches to code structure and display. Integrated development environments (IDEs) aim to integrate all such help. Techniques like Code refactoring can enhance readability. The academic field and the engineering practice of computer programming are both largely concerned with discovering and implementing the most efficient algorithms for a given class of problem. For this purpose, algorithms are classified into "orders" using so-called Big O notation, which expresses resource use, such as execution time or memory consumption, in terms of the size of an input. Expert programmers are familiar with a variety of well-established algorithms and their respective complexities and use this knowledge to choose algorithms that are best suited to the circumstances. "Programming a Computer for Playing Chess" was a 1950 paper that evaluated a "minimax" algorithm that is part of the history of algorithmic complexity; a course on IBM's Deep Blue (chess computer) is part of the computer science curriculum at Stanford University. The first step in most formal software development processes is requirements analysis, followed by testing to determine value modeling, implementation, and failure elimination (debugging). There exist a lot of differing approaches for each of those tasks. One approach popular for requirements analysis is Use Case analysis. Many programmers use forms of Agile software development where the various stages of formal software development are more integrated together into short cycles that take a few weeks rather than years. There are many approaches to the Software development process. Popular modeling techniques include Object-Oriented Analysis and Design (OOAD) and Model-Driven Architecture (MDA). The Unified Modeling Language (UML) is a notation used for both the OOAD and MDA. A similar technique used for database design is Entity-Relationship Modeling (ER Modeling). Implementation techniques include imperative languages (object-oriented or procedural), functional languages, and logic languages. It is very difficult to determine what are the most popular of modern programming languages. Methods of measuring programming language popularity include: counting the number of job advertisements that mention the language, the number of books sold and courses teaching the language (this overestimates the importance of newer languages), and estimates of the number of existing lines of code written in the language (this underestimates the number of users of business languages such as COBOL). Some languages are very popular for particular kinds of applications, while some languages are regularly used to write many different kinds of applications. For example, COBOL is still strong in corporate data centers often on large mainframe computers, Fortran in engineering applications, scripting languages in Web development, and C in embedded software. Many applications use a mix of several languages in their construction and use. New languages are generally designed around the syntax of a prior language with new functionality added, (for example C++ adds object-orientation to C, and Java adds memory management and bytecode to C++, but as a result, loses efficiency and the ability for low-level manipulation). Debugging is a very important task in the software development process since having defects in a program can have significant consequences for its users. Some languages are more prone to some kinds of faults because their specification does not require compilers to perform as much checking as other languages. Use of a static code analysis tool can help detect some possible problems. Normally the first step in debugging is to attempt to reproduce the problem. This can be a non-trivial task, for example as with parallel processes or some unusual software bugs. Also, specific user environment and usage history can make it difficult to reproduce the problem. After the bug is reproduced, the input of the program may need to be simplified to make it easier to debug. For example, a bug in a compiler can make it crash when passing some large source file. However, after simplification of the test case, only few lines from the original source file can be sufficient to reproduce the same crash. Such simplification can be done manually, using a divide-and-conquer approach. The programmer will try to remove some parts of original test case and check if the problem still exists. When debugging the problem in a GUI, the programmer can try to skip some user interaction from the original problem description and check if remaining actions are sufficient for bugs to appear. Debugging is often done with IDEs like Eclipse, Visual Studio, Xcode, Kdevelop, NetBeans and. Standalone debuggers like GDB are also used, and these often provide less of a visual environment, usually using a command line. Some text editors such as Emacs allow GDB to be invoked through them, to provide a visual environment. Different programming languages support different styles of programming (called "programming paradigms"). The choice of language used is subject to many considerations, such as company policy, suitability to task, availability of third-party packages, or individual preference. Ideally, the programming language best suited for the task at hand will be selected. Trade-offs from this ideal involve finding enough programmers who know the language to build a team, the availability of compilers for that language, and the efficiency with which programs written in a given language execute. Languages form an approximate spectrum from "low-level" to "high-level"; "low-level" languages are typically more machine-oriented and faster to execute, whereas "high-level" languages are more abstract and easier to use but execute less quickly. It is usually easier to code in "high-level" languages than in "low-level" ones. Allen Downey, in his book "How To Think Like A Computer Scientist", writes: Many computer languages provide a mechanism to call functions provided by shared libraries. Provided the functions in a library follow the appropriate run-time conventions (e.g., method of passing arguments), then these functions may be written in any other language. Computer programmers are those who write computer software. Their jobs usually involve:
Computer programming is the process of designing and building an executable computer program to accomplish a specific computing result. Programming involves tasks such as: analysis, generating algorithms, profiling algorithms' accuracy and resource consumption, and the implementation of algorithms in a chosen programming language (commonly referred to as coding). The source code of a program is written in one or more languages that are intelligible to programmers, rather than machine code, which is directly executed by the central processing unit. The purpose of programming is to find a sequence of instructions that will automate the performance of a task (which can be as complex as an operating system) on a computer, often for solving a given problem. Proficient programming thus often requires expertise in several different subjects, including knowledge of the application domain, specialized algorithms, and formal logic.
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summarize: Modern particle physics research is focused on subatomic particles, including atomic constituents such as electrons, protons, and neutrons (protons and neutrons are composite particles called baryons, made of quarks), produced by radioactive and scattering processes, such as photons, neutrinos, and muons, as well as a wide range of exotic particles. Dynamics of particles is also governed by quantum mechanics; they exhibit wave–particle duality, displaying particle-like behaviour under certain experimental conditions and wave-like behaviour in others. In more technical terms, they are described by quantum state vectors in a Hilbert space, which is also treated in quantum field theory. Following the convention of particle physicists, the term "elementary particles" is applied to those particles that are, according to current understanding, presumed to be indivisible and not composed of other particles. All particles and their interactions observed to date can be described almost entirely by a quantum field theory called the Standard Model. The Standard Model, as currently formulated, has 61 elementary particles. Those elementary particles can combine to form composite particles, accounting for the hundreds of other species of particles that have been discovered since the 1960s. The Standard Model has been found to agree with almost all the experimental tests conducted to date. However, most particle physicists believe that it is an incomplete description of nature and that a more fundamental theory awaits discovery (See Theory of Everything). In recent years, measurements of neutrino mass have provided the first experimental deviations from the Standard Model, since neutrinos are massless in the Standard Model. The idea that all matter is fundamentally composed of elementary particles dates from at least the 6th century BC. In the 19th century, John Dalton, through his work on stoichiometry, concluded that each element of nature was composed of a single, unique type of particle. The word "atom", after the Greek word "atomos" meaning "indivisible", has since then denoted the smallest particle of a chemical element, but physicists soon discovered that atoms are not, in fact, the fundamental particles of nature, but are conglomerates of even smaller particles, such as the electron. The early 20th century explorations of nuclear physics and quantum physics led to proofs of nuclear fission in 1939 by Lise Meitner (based on experiments by Otto Hahn), and nuclear fusion by Hans Bethe in that same year; both discoveries also led to the development of nuclear weapons. Throughout the 1950s and 1960s, a bewildering variety of particles were found in collisions of particles from beams of increasingly high energy. It was referred to informally as the "particle zoo". That term was deprecated after the formulation of the Standard Model during the 1970s, in which the large number of particles was explained as combinations of a (relatively) small number of more fundamental particles. The current state of the classification of all elementary particles is explained by the Standard Model, which gained widespread acceptance in the mid-1970s after experimental confirmation of the existence of quarks. It describes the strong, weak, and electromagnetic fundamental interactions, using mediating gauge bosons. The species of gauge bosons are eight gluons,, and bosons, and the photon. The Standard Model also contains 24 fundamental fermions (12 particles and their associated anti-particles), which are the constituents of all matter. Finally, the Standard Model also predicted the existence of a type of boson known as the Higgs boson. On 4 July 2012, physicists with the Large Hadron Collider at CERN announced they had found a new particle that behaves similarly to what is expected from the Higgs boson. The world's major particle physics laboratories are: Many other particle accelerators also exist. The techniques required for modern experimental particle physics are quite varied and complex, constituting a sub-specialty nearly completely distinct from the theoretical side of the field. Theoretical particle physics attempts to develop the models, theoretical framework, and mathematical tools to understand current experiments and make predictions for future experiments (see also theoretical physics). There are several major interrelated efforts being made in theoretical particle physics today. One important branch attempts to better understand the Standard Model and its tests. By extracting the parameters of the Standard Model, from experiments with less uncertainty, this work probes the limits of the Standard Model and therefore expands our understanding of nature's building blocks. Those efforts are made challenging by the difficulty of calculating quantities in quantum chromodynamics. Some theorists working in this area refer to themselves as phenomenologists and they may use the tools of quantum field theory and effective field theory. Others make use of lattice field theory and call themselves "lattice theorists". Another major effort is in model building where model builders develop ideas for what physics may lie beyond the Standard Model (at higher energies or smaller distances). This work is often motivated by the hierarchy problem and is constrained by existing experimental data. It may involve work on supersymmetry, alternatives to the Higgs mechanism, extra spatial dimensions (such as the Randall–Sundrum models), Preon theory, combinations of these, or other ideas. A third major effort in theoretical particle physics is string theory. "String theorists" attempt to construct a unified description of quantum mechanics and general relativity by building a theory based on small strings, and branes rather than particles. If the theory is successful, it may be considered a "Theory of Everything", or "TOE". There are also other areas of work in theoretical particle physics ranging from particle cosmology to loop quantum gravity. This division of efforts in particle physics is reflected in the names of categories on the arXiv, a preprint archive: hep-th (theory), hep-ph (phenomenology), hep-ex (experiments), hep-lat (lattice gauge theory). In principle, all physics (and practical applications developed therefrom) can be derived from the study of fundamental particles. In practice, even if "particle physics" is taken to mean only "high-energy atom smashers", many technologies have been developed during these pioneering investigations that later find wide uses in society. Particle accelerators are used to produce medical isotopes for research and treatment (for example, isotopes used in PET imaging), or used directly in external beam radiotherapy. The development of superconductors has been pushed forward by their use in particle physics. The World Wide Web and touchscreen technology were initially developed at CERN. Additional applications are found in medicine, national security, industry, computing, science, and workforce development, illustrating a long and growing list of beneficial practical applications with contributions from particle physics. The primary goal, which is pursued in several distinct ways, is to find and understand what physics may lie beyond the standard model. There are several powerful experimental reasons to expect new physics, including dark matter and neutrino mass. There are also theoretical hints that this new physics should be found at accessible energy scales. Much of the effort to find this new physics are focused on new collider experiments. The Large Hadron Collider (LHC) was completed in 2008 to help continue the search for the Higgs boson, supersymmetric particles, and other new physics. An intermediate goal is the construction of the International Linear Collider (ILC), which will complement the LHC by allowing more precise measurements of the properties of newly found particles. In August 2004, a decision for the technology of the ILC was taken but the site has still to be agreed upon. In addition, there are important non-collider experiments that also attempt to find and understand physics beyond the Standard Model. One important non-collider effort is the determination of the neutrino masses, since these masses may arise from neutrinos mixing with very heavy particles. In addition, cosmological observations provide many useful constraints on the dark matter, although it may be impossible to determine the exact nature of the dark matter without the colliders. Finally, lower bounds on the very long lifetime of the proton put constraints on Grand Unified Theories at energy scales much higher than collider experiments will be able to probe any time soon. In May 2014, the Particle Physics Project Prioritization Panel released its report on particle physics funding priorities for the United States over the next decade. This report emphasized continued U.S. participation in the LHC and ILC, and expansion of the Deep Underground Neutrino Experiment, among other recommendations. The term "high energy physics" requires elaboration. Intuitively, it might seem incorrect to associate "high energy" with the physics of very small, "low" mass objects, like subatomic particles. By comparison, an example of a macroscopic system, one gram of hydrogen, has ~ times the mass of a single proton. Even an entire beam of protons circulated in the LHC contains ~ protons, each with of energy, for a total beam energy of ~ or ~ 336.4 MJ, which is still ~ times lower than the mass-energy of a single gram of hydrogen. Yet, the macroscopic realm is "low energy physics", while that of quantum particles is "high energy physics". The interactions studied in other fields of physics and science have comparatively very low energy. For example, the photon energy of visible light is about 1.8 to 3.1 eV. Similarly, the bond-dissociation energy of a carbon–carbon bond is about 3.6 eV. Other chemical reactions typically involve similar amounts of energy. Even photons with far higher energy, gamma rays of the kind produced in radioactive decay, mostly have photon energy between and – still two orders of magnitude lower than the mass of a single proton. Radioactive decay gamma rays are considered as part of nuclear physics, rather than high energy physics. The proton has a mass of around ; some other massive quantum particles, both elementary and hadronic, have yet higher masses. Due to these very high energies "at the single particle level", particle physics is, in fact, high-energy physics.
Particle physics (also known as high energy physics) is a branch of physics that studies the nature of the particles that constitute matter and radiation. Although the word "particle" can refer to various types of very small objects (e.g. protons, gas particles, or even household dust), usually investigates the irreducibly smallest detectable particles and the fundamental interactions necessary to explain their behaviour. By our current understanding, these elementary particles are excitations of the quantum fields that also govern their interactions. The currently dominant theory explaining these fundamental particles and fields, along with their dynamics, is called the Standard Model. Thus, modern particle physics generally investigates the Standard Model and its various possible extensions, e.g. to the newest "known" particle, the Higgs boson, or even to the oldest known force field, gravity.
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summarize: The name America was first recorded in 1507. A two-dimensional globe created by Martin Waldseemüller was the earliest recorded use of the term. The name was also used (together with the related term "Amerigen") in the "Cosmographiae Introductio", apparently written by Matthias Ringmann, in reference to South America. It was applied to both North and South America by Gerardus Mercator in 1538. America derives from "Americus", the Latin version of Italian explorer Amerigo Vespucci's first name. The feminine form "America" accorded with the feminine names of Asia, Africa, and Europa. In modern English, North and South America are generally considered separate continents, and taken together are called "America" or "the Americas" in the plural. When conceived as a unitary continent, the form is generally "the continent of America" in the singular. However, without a clarifying context, singular "America" in English commonly refers to the United States of America. Historically, in the English-speaking world, the term America usually referred to a single continent until the 1950s (as in Van Loon's "Geography" of 1937): According to historians Kären Wigen and Martin W. Lewis, The first inhabitants migrated into the Americas from Asia. Habitation sites are known in Alaska and the Yukon from at least 20,000 years ago, with suggested ages of up to 40,000 years. Beyond that, the specifics of the Paleo-Indian migration to and throughout the Americas, including the dates and routes traveled, are subject to ongoing research and discussion. Widespread habitation of the Americas occurred during the late glacial maximum, from 16,000 to 13,000 years ago. The traditional theory has been that these early migrants moved into the Beringia land bridge between eastern Siberia and present-day Alaska around 40,000–17,000 years ago, when sea levels were significantly lowered during the Quaternary glaciation. These people are believed to have followed herds of now-extinct pleistocene megafauna along "ice-free corridors" that stretched between the Laurentide and Cordilleran ice sheets. Another route proposed is that, either on foot or using primitive boats, they migrated down the Pacific coast to South America. Evidence of the latter would since have been covered by a sea level rise of hundreds of meters following the last ice age. Both routes may have been taken, although the genetic evidences suggests a single founding population. The micro-satellite diversity and distributions specific to South American Indigenous people indicates that certain populations have been isolated since the initial colonization of the region. A second migration occurred after the initial peopling of the Americas; Na Dene speakers found predominantly in North American groups at varying genetic rates with the highest frequency found among the Athabaskans at 42% derive from this second wave. Linguists and biologists have reached a similar conclusion based on analysis of Amerindian language groups and ABO blood group system distributions. Then the people of the Arctic small tool tradition a broad cultural entity that developed along the Alaska Peninsula, around Bristol Bay, and on the eastern shores of the Bering Strait around 2,500 BCE (4,500 years ago) moved into North America. The Arctic small tool tradition, a Paleo-Eskimo culture branched off into two cultural variants, including the Pre-Dorset, and the Independence traditions of Greenland. The descendants of the Pre-Dorset cultural group, the Dorset culture was displaced by the final migrants from the Bering sea coast line the ancestors of modern Inuit, the Thule people by 1000 Common Era (CE). Around the same time as the Inuit migrated into Greenland, Viking settlers began arriving in Greenland in 982 and Vinland shortly thereafter, establishing a settlement at L'Anse aux Meadows, near the northernmost tip of Newfoundland. The Viking settlers quickly abandoned Vinland, and disappeared from Greenland by 1500. The pre-Columbian era incorporates all period subdivisions in the history and prehistory of the Americas before the appearance of significant European influences on the American continents, spanning the time of the original settlement in the Upper Paleolithic to European colonization during the Early Modern period. The term "Pre-Columbian" is used especially often in the context of the great indigenous civilizations of the Americas, such as those of Mesoamerica (the Olmec, the Toltec, the Teotihuacano, the Zapotec, the Mixtec, the Aztec, and the Maya) and the Andes (Inca, Moche, Muisca, Cañaris). Many pre-Columbian civilizations established characteristics and hallmarks which included permanent or urban settlements, agriculture, civic and monumental architecture, and complex societal hierarchies. Some of these civilizations had long faded by the time of the first permanent European arrivals (c. late 15th–early 16th centuries), and are known only through archeological investigations. Others were contemporary with this period, and are also known from historical accounts of the time. A few, such as the Maya, had their own written records. However, most Europeans of the time viewed such texts as pagan, and much was destroyed in Christian pyres. Only a few hidden documents remain today, leaving modern historians with glimpses of ancient culture and knowledge. Although there had been previous trans-oceanic contact, large-scale European colonization of the Americas began with the first voyage of Christopher Columbus in 1492. The first Spanish settlement in the Americas was La Isabela in northern Hispaniola. This town was abandoned shortly after in favor of Santo Domingo de Guzmán, founded in 1496, the oldest American city of European foundation. This was the base from which the Spanish monarchy administered its new colonies and their expansion. Santo Domingo was subject to frequent raids by English and French pirates. On the continent, Panama City on the Pacific coast of Central America, founded on August 15, 1519, played an important role, being the base for the Spanish conquest of South America. Conquistador Lucas Vázquez de Ayllón established San Miguel de Guadalupe, the first European settlement in what is now the United States, on the Pee Dee River in South Carolina. During the first half of the 16th century, Spanish colonists conducted raids throughout the Caribbean Basin, bringing captives from Central America, northern South America, and Florida back to Hispaniola and other Spanish settlements. France, led by Jacques Cartier and Giovanni da Verrazano, focused primarily on North America. English explorations of the Americas were led by Giovanni Caboto and Sir Walter Raleigh. The Dutch in New Netherland confined their operations to Manhattan Island, Long Island, the Hudson River Valley, and what later became New Jersey. The spread of new diseases brought by Europeans and African slaves killed many of the inhabitants of North America and South America, with a general population crash of Native Americans occurring in the mid-16th century, often well ahead of European contact. One of the most devastating diseases was smallpox. European immigrants were often part of state-sponsored attempts to found colonies in the Americas. Migration continued as people moved to the Americas fleeing religious persecution or seeking economic opportunities. Millions of individuals were forcibly transported to the Americas as slaves, prisoners or indentured servants. Decolonization of the Americas began with the American Revolution and the Haitian Revolution in the late 1700s. This was followed by numerous Latin American wars of independence in the early 1800s. Between 1811 and 1825, Paraguay, Argentina, Chile, Gran Colombia, the United Provinces of Central America, Mexico, Brazil, Peru, and Bolivia gained independence from Spain and Portugal in armed revolutions. After the Dominican Republic won independence from Haiti, it was re-annexed by Spain in 1861, but reclaimed its independence in 1865 at the conclusion of the Dominican Restoration War. The last violent episode of decolonization was the Cuban War of Independence which became the Spanish–American War, which resulted in the independence of Cuba in 1898, and the transfer of sovereignty over Puerto Rico from Spain to the United States. Peaceful decolonization began with the purchase by the United States of Louisiana from France in 1803, Florida from Spain in 1819, of Alaska from Russia in 1867, and the Danish West Indies from Denmark in 1916. Canada became independent of the United Kingdom, starting with the Balfour Declaration of 1926, Statute of Westminster 1931, and ending with the patriation of the Canadian Constitution in 1982. The Dominion of Newfoundland similarly achieved partial independence under the Balfour Declaration and Statute of Westminster, but was re-absorbed into the United Kingdom in 1934. It was subsequently confederated with Canada in 1949. The remaining European colonies in the Caribbean began to achieve peaceful independence well after World War II. Jamaica and Trinidad and Tobago became independent in 1962, and Guyana and Barbados both achieved independence in 1966. In the 1970s, the Bahamas, Grenada, Dominica, St. Lucia, and St. Vincent and the Grenadines all became independent of the United Kingdom, and Suriname became independent of the Netherlands. Belize, Antigua and Barbuda, and Saint Kitts and Nevis achieved independence from the United Kingdom in the 1980s. The Americas make up most of the land in Earth's western hemisphere. The northernmost point of the Americas is Kaffeklubben Island, which is the most northerly point of land on Earth. The southernmost point is the islands of Southern Thule, although they are sometimes considered part of Antarctica. The mainland of the Americas is the world's longest north-to-south landmass. The distance between its two polar extremities, the Boothia Peninsula in northern Canada and Cape Froward in Chilean Patagonia, is roughly. The mainland's most westerly point is the end of the Seward Peninsula in Alaska; Attu Island, further off the Alaskan coast to the west, is considered the westernmost point of the Americas. Ponta do Seixas in northeastern Brazil forms the easternmost extremity of the mainland, while Nordostrundingen, in Greenland, is the most easterly point of the continental shelf. South America broke off from the west of the supercontinent Gondwana around 135 million years ago, forming its own continent. Around 15 million years ago, the collision of the Caribbean Plate and the Pacific Plate resulted in the emergence of a series of volcanoes along the border that created a number of islands. The gaps in the archipelago of Central America filled in with material eroded off North America and South America, plus new land created by continued volcanism. By three million years ago, the continents of North America and South America were linked by the Isthmus of Panama, thereby forming the single landmass of the Americas. The Great American Interchange resulted in many species being spread across the Americas, such as the cougar, porcupine, opossums, armadillos and hummingbirds. The geography of the western Americas is dominated by the American cordillera, with the Andes running along the west coast of South America and the Rocky Mountains and other North American Cordillera ranges running along the western side of North America. The Appalachian Mountains run along the east coast of North America from Alabama to Newfoundland. North of the Appalachians, the Arctic Cordillera runs along the eastern coast of Canada. The largest mountain ranges are the Andes and Rocky Mountains. The Sierra Nevada and the Cascade Range reach similar altitudes as the Rocky Mountains, but are significantly smaller. In North America, the greatest number of fourteeners are in the United States, and more specifically in the U.S. state of Colorado. The highest peaks of the Americas are located in the Andes, with Aconcagua of Argentina being the highest; in North America Denali (Mount McKinley) in the U.S. state of Alaska is the tallest. Between its coastal mountain ranges, North America has vast flat areas. The Interior Plains spread over much of the continent, with low relief. The Canadian Shield covers almost 5 million km2 of North America and is generally quite flat. Similarly, the north-east of South America is covered by the flat Amazon Basin. The Brazilian Highlands on the east coast are fairly smooth but show some variations in landform, while farther south the Gran Chaco and Pampas are broad lowlands. The climate of the Americas varies significantly from region to region. Tropical rainforest climate occurs in the latitudes of the Amazon, American cloud forests, Florida and Darien Gap. In the Rocky Mountains and Andes, dry and continental climates are observed. Often the higher altitudes of these mountains are snow-capped. Southeastern North America is well known for its occurrence of tornadoes and hurricanes, of which the vast majority of tornadoes occur in the United States' Tornado Alley, as well as in the southerly Dixie Alley in the North American late-winter and early spring seasons. Often parts of the Caribbean are exposed to the violent effects of hurricanes. These weather systems are formed by the collision of dry, cool air from Canada and wet, warm air from the Atlantic. With coastal mountains and interior plains, the Americas have several large river basins that drain the continents. The largest river basin in North America is that of the Mississippi, covering the second largest watershed on the planet. The Mississippi-Missouri river system drains most of 31 states of the U.S., most of the Great Plains, and large areas between the Rocky and Appalachian mountains. This river is the fourth longest in the world and tenth most powerful in the world. In North America, to the east of the Appalachian Mountains, there are no major rivers but rather a series of rivers and streams that flow east with their terminus in the Atlantic Ocean, such as the Hudson River, Saint John River, and Savannah River. A similar instance arises with central Canadian rivers that drain into Hudson Bay; the largest being the Churchill River. On the west coast of North America, the main rivers are the Colorado River, Columbia River, Yukon River, Fraser River, and Sacramento River. The Colorado River drains much of the Southern Rockies and parts of the Great Basin and Range Province. The river flows approximately into the Gulf of California, during which over time it has carved out natural phenomena such as the Grand Canyon and created phenomena such as the Salton Sea. The Columbia is a large river, long, in central western North America and is the most powerful river on the West Coast of the Americas. In the far northwest of North America, the Yukon drains much of the Alaskan peninsula and flows from parts of Yukon and the Northwest Territory to the Pacific. Draining to the Arctic Ocean of Canada, the Mackenzie River drains waters from the Arctic Great Lakes of Arctic Canada, as opposed to the Saint-Lawrence River that drains the Great Lakes of Southern Canada into the Atlantic Ocean. The Mackenzie River is the largest in Canada and drains. The largest river basin in South America is that of the Amazon, which has the highest volume flow of any river on Earth. The second largest watershed of South America is that of the Paraná River, which covers about 2.5 million km2. North America and South America began to develop a shared population of flora and fauna around 2.5 million years ago, when continental drift brought the two continents into contact via the Isthmus of Panama. Initially, the exchange of biota was roughly equal, with North American genera migrating into South America in about the same proportions as South American genera migrated into North America. This exchange is known as the Great American Interchange. The exchange became lopsided after roughly a million years, with the total spread of South American genera into North America far more limited in scope than the spread on North American genera into South America. There are 35 sovereign states in the Americas, as well as an autonomous country of Denmark, three overseas departments of France, three overseas collectivities of France, and one uninhabited territory of France, eight overseas territories of the United Kingdom, three constituent countries of the Netherlands, three public bodies of the Netherlands, two unincorporated territories of the United States, and one uninhabited territory of the United States. In 2015 the total population of the Americas was about 985 million people, divided as follows: There are three urban centers that each hold titles for being the largest population area based on the three main demographic concepts: In accordance with these definitions, the three largest population centers in the Americas are: Mexico City, anchor to the largest metropolitan area in the Americas; New York City, anchor to the largest urban area in the Americas; and São Paulo, the largest city proper in the Americas. All three cities maintain Alpha classification and large scale influence. The population of the Americas is made up of the descendants of four large ethnic groups and their combinations. The majority of the population live in Latin America, named for its predominant cultures, rooted in Latin Europe (including the two dominant languages, Spanish and Portuguese, both Romance languages), more specifically in the Iberian nations of Portugal and Spain (hence the use of the term Ibero-America as a synonym). Latin America is typically contrasted with Anglo-America, where English, a Germanic language, is prevalent, and which comprises Canada (with the exception of francophone Canada rooted in Latin Europe [France]—see Québec and Acadia) and the United States. Both countries are located in North America, with cultures deriving predominantly from Anglo-Saxon and other Germanic roots. The most prevalent faiths in the Americas are as follows: Other faiths include Buddhism; Hinduism; Sikhism; Bahá'í Faith; a wide variety of indigenous religions, many of which can be categorized as animistic; new age religions and many African and African-derived religions. Syncretic faiths can also be found throughout the Americas. Various languages are spoken in the Americas. Some are of European origin, others are spoken by indigenous peoples or are the mixture of various languages like the different creoles. The most widely spoken language in the Americas is Spanish. The dominant language of Latin America is Spanish, though the most populous nation in Latin America, Brazil, speaks Portuguese. Small enclaves of French-, Dutch- and English-speaking regions also exist in Latin America, notably in French Guiana, Suriname, and Belize and Guyana respectively. Haitian Creole is dominant in the nation of Haiti, where French is also spoken. Native languages are more prominent in Latin America than in Anglo-America, with Nahuatl, Quechua, Aymara and Guaraní as the most common. Various other native languages are spoken with less frequency across both Anglo-America and Latin America. Creole languages other than Haitian Creole are also spoken in parts of Latin America. The dominant language of Anglo-America is English. French is also official in Canada, where it is the predominant language in Quebec and an official language in New Brunswick along with English. It is also an important language in Louisiana, and in parts of New Hampshire, Maine, and Vermont. Spanish has kept an ongoing presence in the Southwestern United States, which formed part of the Viceroyalty of New Spain, especially in California and New Mexico, where a distinct variety of Spanish spoken since the 17th century has survived. It has more recently become widely spoken in other parts of the United States because of heavy immigration from Latin America. High levels of immigration in general have brought great linguistic diversity to Anglo-America, with over 300 languages known to be spoken in the United States alone, but most languages are spoken only in small enclaves and by relatively small immigrant groups. The nations of Guyana, Suriname, and Belize are generally considered not to fall into either Anglo-America or Latin America because of their language differences from Latin America, geographic differences from Anglo-America, and cultural and historical differences from both regions; English is the primary language of Guyana and Belize, and Dutch is the primary language of Suriname. Most of the non-native languages have, to different degrees, evolved differently from the mother country, but are usually still mutually intelligible. Some have combined, however, which has even resulted in completely new languages, such as Papiamento, which is a combination of Portuguese, Spanish, Dutch (representing the respective colonizers), native Arawak, various African languages, and, more recently English. The lingua franca Portuñol, a mixture of Portuguese and Spanish, is spoken in the border regions of Brazil and neighboring Spanish-speaking countries. More specifically, Riverense Portuñol is spoken by around 100,000 people in the border regions of Brazil and Uruguay. Because of immigration, there are many communities where other languages are spoken from all parts of the world, especially in the United States, Brazil, Argentina, Canada, Chile, Costa Rica and Uruguay—very important destinations for immigrants. Speakers of English generally refer to the landmasses of North America and South America as "the Americas", the "Western Hemisphere", or the "New World". The adjective "American" may be used to indicate something pertains to the Americas, but this term is primarily used in English to indicate something pertaining to the United States. Some non-ambiguous alternatives exist, such as the adjective "Pan-American", or "New Worlder" as a demonym for a resident of the closely related New World. Use of "America" in the hemispherical sense is sometimes retained, or can occur when translated from other languages. For example, the Association of National Olympic Committees (ANOC) in Paris maintains a single continental association for "America", represented by one of the five Olympic rings. American essayist H.L. Mencken said, "The Latin-Americans use Norteamericano in formal writing, but, save in Panama, prefer nicknames in colloquial speech." To avoid "American" one can use constructed terms in their languages derived from "United States" or even "North America". In Canada, its southern neighbor is often referred to as "the United States", "the U.S.A.", or (informally) "the States", while U.S. citizens are generally referred to as "Americans". Most Canadians resent being referred to as "Americans". In Spanish, "América" is a single continent composed of the subcontinents of "América del Sur" and "América del Norte", the land bridge of "América Central", and the islands of the "Antillas". "Americano" or "americana" in Spanish refers to a person from "América" in a similar way that "europeo" or "europea" refers to a person from "Europa". The terms "sudamericano/a", "centroamericano/a", "antillano/a" and "norteamericano/a" can be used to more specifically refer to the location where a person may live. Citizens of the United States of America are normally referred to by the term "estadounidense" (rough literal translation: "United Statesian") instead of "americano" or "americana" which is discouraged, and the country's name itself is officially translated as "Estados Unidos de América" (United States of America), commonly abbreviated as "Estados Unidos" (EEUU). Also, the term "norteamericano" (North American) may refer to a citizen of the United States. This term is primarily used to refer to citizens of the United States, and less commonly to those of other North American countries. In Portuguese, "" is a single continent composed of "América do Sul" (South America), "América Central" (Central America) and "América do Norte" (North America). It can be ambiguous, as "América" can be used to refer to the United States of America, but is avoided in print and formal environments. In French the word "américain" may be used for things relating to the Americas; however, similar to English, it is most often used for things relating to the United States, with the term "états-unien" sometimes used for clarity. "Panaméricain" may be used as an adjective to refer to the Americas without ambiguity. French speakers may use the noun "Amérique" to refer to the whole landmass as one continent, or two continents, "Amérique du Nord" and "Amérique du Sud". In French, "Amérique" is seldom used to refer to the United States, leading to some ambiguity when it is. Similar to English usage, "les Amériques" or "des Amériques" is used to refer unambiguously to the Americas. In Dutch, the word "Amerika" mostly refers to the United States. Although the United States is equally often referred to as "de Verenigde Staten" ("the United States") or "de VS" ("the US"), "Amerika" relatively rarely refers to the Americas, but it is the only commonly used Dutch word for the Americas. This often leads to ambiguity; and to stress that something concerns the Americas as a whole, Dutch uses a combination, namely "Noord- en Zuid-Amerika" (North and South America). Latin America is generally referred to as "Latijns Amerika" or "Midden-Amerika" for Central America. The adjective "Amerikaans" is most often used for things or people relating to the United States. There are no alternative words to distinguish between things relating to the United States or to the Americas. Dutch uses the local alternative for things relating to elsewhere in the Americas, such as "Argentijns" for Argentine, etc. The following is a list of multinational organizations in the Americas. Dominica, Panama and the Dominican Republic have the fastest-growing economy in the Americas according to the International Monetary Fund (IMF), In 2016, five to seven countries in the southern part of the Americas had weakening economies in decline, compared to only three countries in the northern part of the Americas. Haiti has the lowest GDP per capita in the Americas, although its economy was growing slightly.
The Americas (also collectively called America;,, Portuguese and Spanish: "América") comprise the totality of the continents of North and South America. Together, they make up most of the land in Earth's Western Hemisphere and comprise the New World.
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summarize: A program in Karel is used to control a simple robot named Karel that lives in an environment consisting of a grid of streets (left-right) and avenues (up-down). Karel understands five basic instructions: codice_1 (Karel moves by one square in the direction he is facing), codice_2 (Karel turns 90 ° left), codice_3 (Karel puts a beeper on the square he is standing at), codice_4 (Karel lifts a beeper off the square he is standing at), and codice_5 (Karel switches himself off, the program ends). Karel can also perform boolean queries about his immediate environment, asking whether there is a beeper where he is standing, whether there are barriers next to him, and about the direction he is facing. A programmer can create additional instructions by defining them in terms of the five basic instructions, and by using conditional control flow statements codice_6 and codice_7 with environment queries, and by using the codice_8 construct. The language has inspired the development of various clones and similar educational languages. As the language is intended for beginners, localized variants exist in some languages, notably Czech (the programming language was quite popular in Czechoslovakia). The principles of Karel were updated to the object-oriented programming paradigm in a new programming language called Karel++. Karel++ is conceptually based on Karel, but uses a completely new syntax, similar to Java. A REALbasic implementation, rbKarel, provides the basic Karel commands within an RBScript environment with BASIC syntax being used for loops and conditionals. This teaching project provides a cross-platform GUI for Karel experiments including single-stepping and spoken output. A Karel-inspired language and environment called "Robot Emil" uses a 3D view of the robot's world. "Robot Emil" offers a large palette of objects that can be placed to depict walls, windows (transparency), water and grass. The camera may be moved freely throughout the 3D environment. The robot may be controlled interactively with buttons in the GUI, or by programs written in Emil's Karel-like programming language. The author states that the program is free for use by schools, students and children. Versions are available in English, Czech and Slovak. A proprietary language which is also called Karel is used to program the robots of FANUC Robotics. However, FANUC Karel is derived from Pascal. The language has also been implemented as Karel the Dog in JavaScript by CodeHS. Similar to the original language, this implementation features Karel in a grid world. Programmers use and build upon Karel's simple vocabulary of commands to accomplish programming tasks. Instead of putting and picking beepers, Karel the Dog puts and takes tennis balls.
Karel is an educational programming language for beginners, created by Richard E. Pattis in his book "Karel The Robot: A Gentle Introduction to the Art of Programming". Pattis used the language in his courses at Stanford University, California. The language is named after Karel Čapek, a Czech writer who introduced the word "robot".
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summarize: The cgs system had been declared official in 1881, at the first International Electrical Congress. The erg was adopted as its unit of energy in 1882. Wilhelm Siemens, in his inauguration speech as chairman of the British Association for the Advancement of Science (23 August 1882) first proposed the "Joule" as unit of heat, to be derived from the electromagnetic units Ampere and Ohm, in cgs units equivalent to. The naming of the unit in honour of James Prescott Joule (1818–1889), at the time retired but still living (aged 63), is due to Siemens: At the second International Electrical Congress, on 31 August 1889, the joule was officially adopted alongside the watt and the "quadrant" (later renamed to henry). Joule died in the same year, on 11 October 1889. At the fourth congress (1893), the "international Ampere" and "international Ohm" were defined, with slight changes in the specifications for their measurement, with the "international Joule" being the unit derived from them. In 1935, the International Electrotechnical Commission (as the successor organisation of the International Electrical Congress) adopted the "Giorgi system", which by virtue of assuming a defined value for the magnetic constant also implied a redefinition of the Joule. The Giorgi system was approved by the International Committee for Weights and Measures in 1946. The joule was now no longer defined based on electromagnetic unit, but instead as the unit of work performed by one unit of force (at the time not yet named newton) over the distance of 1 metre. The joule was explicitly intended as the unit of energy to be used in both electromagnetic and mechanical contexts. The ratification of the definition at the ninth General Conference on Weights and Measures, in 1948, added the specification that the joule was also to be preferred as the unit of heat in the context of calorimetry, thereby officially deprecating the use of the calorie. This definition was the direct precursor of the joule as adopted in the modern International System of Units in 1960. The definition of the joule as J=kg⋅m⋅s has remained unchanged since 1946, but the joule as a derived unit has inherited changes in the definitions of the second (in 1960 and 1967), the metre (in 1983) and the kilogram (in 2019). One joule represents (approximately): A kilowatt-hour is 3.6 megajoules. 1 joule is equal to (approximately unless otherwise stated): Units defined exactly in terms of the joule include: In mechanics, the concept of force (in some direction) has a close analogue in the concept of torque (about some angle): A result of this similarity is that the SI unit for torque is the newton metre, which works out algebraically to have the same dimensions as the joule. But they are not interchangeable. The CGPM has given the unit of energy the name "joule", but has not given the unit of torque any special name, hence it is simply the newton metre (N⋅m) – a compound name derived from its constituent parts. The use of newton metres for torque and joules for energy is helpful to avoid misunderstandings and miscommunications. The distinction may be seen also in the fact that energy is a scalar – the dot product of a force vector and a displacement vector. By contrast, torque is a vector – the cross product of a force vector and a distance vector. Torque and energy are related to one another by the equation where "E" is energy, "τ" is (the vector magnitude of) torque, and "θ" is the angle swept (in radians). Since angles are dimensionless, it follows that torque and energy have the same dimensions. A watt-second (symbol W s or W·s) is a derived unit of energy equivalent to the joule. The watt-second is the energy equivalent to the power of one watt sustained for one second. While the watt-second is equivalent to the joule in both units and meaning, there are some contexts in which the term "watt-second" is used instead of "joule". In photography, the unit for flashes is the watt-second. A flash can be rated in watt-seconds (e.g., 300 W⋅s) or in joules (different names for the same thing), but historically, the term "watt-second" has been used and continues to be used. An on-camera flash, using a 1000 microfarad capacitor at 300 volts, would be 45 watt-seconds. Studio flashes, using larger capacitors and higher voltages, are in the 200–2000 watt-second range. The energy rating a flash is given is not a reliable benchmark for its light output because there are numerous factors that affect the energy conversion efficiency. For example, the construction of the tube will affect the efficiency, and the use of reflectors and filters will change the usable light output towards the subject. Some companies specify their products in "true" watt-seconds, and some specify their products in "nominal" watt-seconds.
The joule ( ; symbol: J) is a derived unit of energy in the International System of Units. It is equal to the energy transferred to (or work done on) an object when a force of one newton acts on that object in the direction of the force's motion through a distance of one metre (1 newton metre or N⋅m). It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889).
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summarize: In approximately 50 BCE, the Roman philosopher Lucretius proposed that apparently static macroscopic bodies were composed on a small scale of rapidly moving atoms all bouncing off each other. This Epicurean atomistic point of view was rarely considered in the subsequent centuries, when Aristotlean ideas were dominant. In 1738 Daniel Bernoulli published "Hydrodynamica", which laid the basis for the kinetic theory of gases. In this work, Bernoulli posited the argument, still used to this day, that gases consist of great numbers of molecules moving in all directions, that their impact on a surface causes the gas pressure that we feel, and that what we experience as heat is simply the kinetic energy of their motion. The theory was not immediately accepted, in part because conservation of energy had not yet been established, and it was not obvious to physicists how the collisions between molecules could be perfectly elastic. Other pioneers of the kinetic theory (whose work was largely neglected by their contemporaries) were Mikhail Lomonosov (1747), Georges-Louis Le Sage (ca. 1780, published 1818), John Herapath (1816) and John James Waterston (1843), which connected their research with the development of mechanical explanations of gravitation. In 1856 August Krönig (probably after reading a paper of Waterston) created a simple gas-kinetic model, which only considered the translational motion of the particles. In 1857 Rudolf Clausius, according to his own words independently of Krönig, developed a similar, but much more sophisticated version of the theory which included translational and contrary to Krönig also rotational and vibrational molecular motions. In this same work he introduced the concept of mean free path of a particle. In 1871, Ludwig Boltzmann generalized Maxwell's achievement and formulated the Maxwell–Boltzmann distribution. Also the logarithmic connection between entropy and probability was first stated by him. In the beginning of the twentieth century, however, atoms were considered by many physicists to be purely hypothetical constructs, rather than real objects. An important turning point was Albert Einstein's (1905) and Marian Smoluchowski's (1906) papers on Brownian motion, which succeeded in making certain accurate quantitative predictions based on the kinetic theory. The theory for ideal gases makes the following assumptions: More modern developments relax these assumptions and are based on the Boltzmann equation. These can accurately describe the properties of dense gases, because they include the volume of the molecules. The necessary assumptions are the absence of quantum effects, molecular chaos and small gradients in bulk properties. Expansions to higher orders in the density are known as virial expansions. An important book on kinetic theory is that by Chapman and Cowling. An important approach to the subject is called Chapman–Enskog theory. There have been many modern developments and there is an alternative approach developed by Grad based on moment expansions. In the other limit, for extremely rarefied gases, the gradients in bulk properties are not small compared to the mean free paths. This is known as the Knudsen regime and expansions can be performed in the Knudsen number. In kinetic model of gases, the pressure is equal to the force exerted by the atoms hitting and rebounding from a unit area of the gas container surface. Consider a gas of "N" molecules, each of mass "m", enclosed in a cube of volume "V" = "L". When a gas molecule collides with the wall of the container perpendicular to the "x" axis and bounces off in the opposite direction with the same speed (an elastic collision), the change in momentum is given by: where "p" is the momentum, "i" and "f" indicate initial and final momentum (before and after collision), "x" indicates that only the "x" direction is being considered, and "v" is the speed of the particle (which is the same before and after the collision). The particle impacts one specific side wall once every where "L" is the distance between opposite walls. The force due to this particle is The total force on the wall is where the bar denotes an average over the "N" particles. Since the motion of the particles is random and there is no bias applied in any direction, the average squared speed in each direction is identical: By Pythagorean theorem in three dimensions the total squared speed "v" is given by Therefore: and the force can be written as: This force is exerted on an area "L". Therefore, the pressure of the gas is where "V" = "L" is the volume of the box. In terms of the kinetic energy of the gas "K": This is a first non-trivial result of the kinetic theory because it relates pressure, a macroscopic property, to the (translational) kinetic energy of the molecules formula_12, which is a microscopic property. Rewriting the above result for the pressure as formula_13, we may combine it with the ideal gas law where formula_14 is the Boltzmann constant and formula_15 the absolute temperature defined by the ideal gas law, to obtain which leads to simplified expression of the average kinetic energy per molecule, The kinetic energy of the system is N times that of a molecule, namely formula_18. Then the temperature formula_15 takes the form which becomes Eq.() is one important result of the kinetic theory: "The average molecular kinetic energy is proportional to the ideal gas law's absolute temperature". From Eq.() and Eq.(), we have Thus, the product of pressure and volume per mole is proportional to the average (translational) molecular kinetic energy. Eq.() and Eq.() are called the "classical results", which could also be derived from statistical mechanics; for more details, see: Since there are formula_20 degrees of freedom in a monatomic-gas system with formula_21 particles, the kinetic energy per degree of freedom per molecule is In the kinetic energy per degree of freedom, the constant of proportionality of temperature is 1/2 times Boltzmann constant or R/2 per mole. In addition to this, the temperature will decrease when the pressure drops to a certain point. This result is related to the equipartition theorem. As noted in the article on heat capacity, diatomic gases should have 7 degrees of freedom, but the lighter diatomic gases act as if they have only 5. Monatomic gases have 3 degrees of freedom. Thus the kinetic energy per kelvin (monatomic ideal gas) is 3 [R/2] = 3R/2: At standard temperature (273.15 K), we get: The velocity distribution of particles hitting the container wall can be calculated based on naive kinetic theory, and the result can be used for analyzing effusive flow rate: Assume that, in the container, the number density is formula_22 and particles obey Maxwell's velocity distribution: Then the number of particles hitting the area formula_24 with speed formula_25 at angle formula_26 from the normal, in time interval formula_27 is: Integrating this over all appropriate velocities within the constraint formula_29 yields the number of atomic or molecular collisions with a wall of a container per unit area per unit time: This quantity is also known as the "impingement rate" in vacuum physics. If this small area formula_31 is punched to become a small hole, the effusive flow rate will be: Combined with ideal gas law, this yields: The velocity distribution of particles hitting this small area is: with the constraint formula_29, and formula_36 can be determined by normalization condition to be formula_37. From the kinetic energy formula it can be shown that where "v" is in m/s, "T" is in kelvins, and "m" is the mass of one molecule of gas. The most probable (or mode) speed formula_41 is 81.6% of the rms speed formula_42, and the mean (arithmetic mean, or average) speed formula_43 is 92.1% of the rms speed (isotropic distribution of speeds). See: The kinetic theory of gases deals not only with gases in thermodynamic equilibrium, but also very importantly with gases not in thermodynamic equilibrium. This means using Kinetic Theory to consider what are known as "transport properties", such as viscosity, thermal conductivity and mass diffusivity. In books on elementary kinetic theory one can find results for dilute gas modeling that has widespread use. Derivation of the kinetic model for shear viscosity usually starts by considering a Couette flow where two parallel plates are separated by a gas layer. The upper plate is moving at a constant velocity to the right due to a force F. The lower plate is stationary, and an equal and opposite force must therefore be acting on it to keep it at rest. The molecules in the gas layer have a forward velocity component formula_44 which increase uniformly with distance formula_45 above the lower plate. The non-equilibrium flow is superimposed on a Maxwell-Boltzmann equilibrium distribution of molecular motions. Let formula_46 be the collision cross section of one molecule colliding with another. The number density formula_47 is defined as the number of molecules per (extensive) volume formula_48. The collision cross section per volume or collision cross section density is formula_49, and it is related to the mean free path formula_50 by formula_51 Notice that the unit of the collision cross section per volume formula_49 is reciprocal of length. The mean free path is the average distance traveled by a molecule, or a number of molecules per volume, before they make their first collision. Let formula_53 be the forward velocity of the gas at an imaginary horizontal surface inside the gas layer. The number of molecules arriving at an area formula_24 on one side of the gas layer, with speed formula_25 at angle formula_26 from the normal, in time interval formula_27 is formula_58 These molecules made their last collision at a distance formula_59 above and below the gas layer, and each will contribute a forward momentum of formula_60 where plus sign applies to molecules from above, and minus sign below. Note that the forward velocity gradient formula_61 can be considered to be constant over a distance of mean free path. Integrating over all appropriate velocities within the constraint formula_62 yields the forward momentum transfer per unit time per unit area (also known as shear stress): formula_63 The net rate of momentum per unit area that is transported across the imaginary surface is thus formula_64 Combining the above kinetic equation with Newton's law of viscosity formula_65 gives the equation for shear viscosity, which is usually denoted formula_66 when it is a dilute gas: formula_67 Combining this equation with the equation for mean free path gives formula_68 Maxwell-Boltzmann distribution gives the average (equilibrium) molecular speed as formula_69 where formula_70 is the most probable speed. We note that formula_71 and insert the velocity in the viscosity equation above. This gives the well known equation for shear viscosity for dilute gases: formula_72 and formula_73 is the molar mass. The equation above presupposes that the gas density is low (i.e. the pressure is low). This implies that the kinetic translational energy dominates over rotational and vibrational molecule energies. The viscosity equation further presupposes that there is only one type of gas molecules, and that the gas molecules are perfect elastic and hard core particles of spherical shape. This assumption of elastic, hard core spherical molecules, like billiard balls, implies that the collision cross section of one molecule can be estimated by formula_74 The radius formula_75 is called collision cross section radius or kinetic radius, and the diameter formula_76 is called collision cross section diameter or kinetic diameter of a molecule in a monomolecular gas. There are no simple general relation between the collision cross section and the hard core size of the (fairly spherical) molecule. The relation depends on shape of the potential energy of the molecule. For a real spherical molecule (i.e. a noble gas atom or a reasonably spherical molecule) the interaction potential is more like the Lennard-Jones potential or Morse potential which have a negative part that attracts the other molecule from distances longer than the hard core radius. The radius for zero Lennard-Jones potential is then appropriate to use as estimate for the kinetic radius. Following a similar logic as above, one can derive the kinetic model for thermal conductivity of a dilute gas: Consider two parallel plates separated by a gas layer. Both plates have uniform temperatures, and are so massive compared to the gas layer that they can be treated as thermal reservoirs. The upper plate has a higher temperature than the lower plate. The molecules in the gas layer have a molecular kinetic energy formula_77 which increases uniformly with distance formula_45 above the lower plate. The non-equilibrium energy flow is superimposed on a Maxwell-Boltzmann equilibrium distribution of molecular motions. Let formula_79 be the molecular kinetic energy of the gas at an imaginary horizontal surface inside the gas layer. The number of molecules arriving at an area formula_24 on one side of the gas layer, with speed formula_25 at angle formula_26 from the normal, in time interval formula_27 is formula_58 These molecules made their last collision at a distance formula_59 above and below the gas layer, and each will contribute a molecular kinetic energy of formula_86 where formula_87 is the specific heat capacity. Again, plus sign applies to molecules from above, and minus sign below. Note that the temperature gradient formula_88 can be considered to be constant over a distance of mean free path. Integrating over all appropriate velocities within the constraint formula_62 yields the energy transfer per unit time per unit area (also known as heat flux): formula_90 Note that the energy transfer from above is in the formula_91 direction, and therefore the overall minus sign in the equation. The net heat flux across the imaginary surface is thus formula_92 Combining the above kinetic equation with Fourier's law formula_93 gives the equation for thermal conductivity, which is usually denoted formula_94 when it is a dilute gas: formula_95 Following a similar logic as above, one can derive the kinetic model for mass diffusivity of a dilute gas: Consider a steady diffusion between two regions of the same gas with perfectly flat and parallel boundaries separated by a layer of the same gas. Both regions have uniform number densities, but the upper region has a higher number density than the lower region. In the steady state, the number density at any point is constant (that is, independent of time). However, the number density formula_22 in the layer increases uniformly with distance formula_45 above the lower plate. The non-equilibrium molecular flow is superimposed on a Maxwell-Boltzmann equilibrium distribution of molecular motions. Let formula_98 be the number density of the gas at an imaginary horizontal surface inside the layer. The number of molecules arriving at an area formula_24 on one side of the gas layer, with speed formula_25 at angle formula_26 from the normal, in time interval formula_27 is formula_58 These molecules made their last collision at a distance formula_59 above and below the gas layer, where the local number density is formula_105 Again, plus sign applies to molecules from above, and minus sign below. Note that the number density gradient formula_106 can be considered to be constant over a distance of mean free path. Integrating over all appropriate velocities within the constraint formula_62 yields the molecular transfer per unit time per unit area (also known as diffusion flux): formula_108 Note that the molecular transfer from above is in the formula_91 direction, and therefore the overall minus sign in the equation. The net diffusion flux across the imaginary surface is thus formula_110 Combining the above kinetic equation with Fick's first law of diffusion formula_111 gives the equation for mass diffusivity, which is usually denoted formula_112 when it is a dilute gas: formula_113
The kinetic theory of gases is a historically significant, but simple, model of the thermodynamic behavior of gases, with which many principal concepts of thermodynamics were established. The model describes a gas as a large number of identical submicroscopic particles (atoms or molecules), all of which are in constant, rapid, random motion. Their size is assumed to be much smaller than the average distance between the particles. The particles undergo random elastic collisions between themselves and with the enclosing walls of the container. The basic version of the model describes the ideal gas, and considers no other interactions between the particles and, thus, the nature of kinetic energy transfers during collisions is strictly thermal.
en
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summarize: The total energy of a system can be subdivided and classified into potential energy, kinetic energy, or combinations of the two in various ways. Kinetic energy is determined by the movement of an object – or the composite motion of the components of an object – and potential energy reflects the potential of an object to have motion, and generally is a The word "energy" derives from the, which possibly appears for the first time in the work of Aristotle in the 4th century BC. In contrast to the modern definition, energeia was a qualitative philosophical concept, broad enough to include ideas such as happiness and pleasure. In the late 17th century, Gottfried Leibniz proposed the idea of the, or living force, which defined as the product of the mass of an object and its velocity squared; he believed that total "vis viva" was conserved. To account for slowing due to friction, Leibniz theorized that thermal energy consisted of the random motion of the constituent parts of matter, although it would be more than a century until this was generally accepted. The modern analog of this property, kinetic energy, differs from "vis viva" only by a factor of two. In 1807, Thomas Young was In 1843, Joule independently discovered the mechanical equivalent in a series of experiments. The most famous of them used the "Joule apparatus": a descending weight, attached to a string, caused rotation of a paddle immersed in water, practically insulated from heat transfer. It showed that the gravitational potential energy lost by the weight in descending was equal to the internal energy gained by the water through friction with the paddle. In the International System of Units (SI), the unit of energy is the joule, named after James Prescott Joule. It is a derived In classical mechanics, energy is a conceptually and mathematically useful property, as it is a conserved quantity. Several formulations of mechanics have been developed using energy as a core concept. Work, a function of energy, is force times distance. This says that the work (formula_2) is equal to the line integral of the force F along a path "C"; for details see the mechanical work article. Work and thus energy is frame dependent. For example, consider a ball being hit by a bat. In the center-of-mass reference frame, the bat does no work on the ball. But, in the reference frame of the person swinging the bat, considerable work is done on the ball. The total energy of a system is sometimes called the Hamiltonian, after William Rowan In the context of chemistry, energy is an attribute of a substance as a consequence of its atomic, molecular or aggregate structure. Since a chemical transformation is accompanied by a change in one or more of these kinds of structure, it is invariably accompanied by an increase or decrease of energy of the substances involved. Some energy is transferred between the surroundings and the reactants of the reaction in the form of heat or light; thus the products of a reaction may have more or less energy In biology, energy is an attribute of all biological systems from the biosphere to the smallest living organism. Within an organism it is responsible for growth and development of a biological cell or an organelle of a biological organism. Energy used in respiration is mostly stored in molecular oxygen and can be unlocked by reactions with molecules of substances such as carbohydrates (including sugars), lipids, and proteins stored by cells. In human terms, the human equivalent (H-e) (Human energy conversion) indicates, for a given amount of energy expenditure, the relative quantity of energy needed for human metabolism, assuming an average human energy expenditure of 12,500 kJ per day and a basal metabolic rate of 80 watts. For example, if our In geology, continental drift, mountain ranges, volcanoes, and earthquakes are phenomena that can be explained in terms of energy transformations in the Earth's interior, while meteorological phenomena like wind, rain, hail, snow, lightning, tornadoes and hurricanes are all a result of energy transformations brought about by solar energy on the atmosphere of the planet Earth. Sunlight may be stored as gravitational potential energy after it strikes the Earth, as (for example) water evaporates from oceans and is deposited upon mountains (where, after being released at a hydroelectric dam, it can be used to drive turbines or generators to produce electricity). Sunlight also drives many weather phenomena, save those generated by volcanic events. An example of a In cosmology and astronomy the phenomena of stars, nova, supernova, quasars and gamma-ray bursts are the universe's highest-output energy transformations of matter. All stellar phenomena (including solar activity) are driven by various kinds of energy transformations. Energy in such transformations is either from gravitational collapse of matter (usually molecular hydrogen) into various classes of astronomical objects (stars, black holes, etc.), or from nuclear fusion (of lighter In quantum mechanics, energy is defined in terms of the energy operator as a time derivative of the wave function. The Schrödinger equation equates the energy operator to the full energy of a particle or a system. Its results can be considered as a definition of measurement of energy in quantum mechanics. The Schrödinger equation describes the space- and time-dependence of a When calculating kinetic energy (work to accelerate a massive body from zero speed to some finite speed) relativistically – using Lorentz transformations instead of Newtonian mechanics – Einstein discovered an unexpected by-product of these calculations to be an energy term which does not vanish at zero speed. He called it rest energy: energy which every massive body must possess even when being at rest. The amount of energy is directly proportional to the mass of the body: where For example, consider electron–positron annihilation, in which the rest energy of these two individual particles (equivalent to their rest mass) is converted to the radiant energy of the photons produced in the process. In this system the matter and antimatter (electrons and positrons) are destroyed and changed to non-matter (the photons). However, the total mass and total energy do not Energy may be transformed between different forms at various efficiencies. Items that transform between these forms are called transducers. Examples of transducers include a battery, from chemical energy to electric energy; a dam: gravitational potential energy to kinetic energy of moving water (and the blades of a turbine) and ultimately to electric energy through an electric generator; or a heat engine, from heat to work. Examples of energy transformation include generating electric energy from heat energy via a steam turbine, or lifting an object against gravity using electrical energy driving a crane motor. Lifting against gravity performs mechanical work on the object and stores gravitational potential energy in the object. If the object falls to the ground, gravity does mechanical work on the object which transforms the potential energy in the gravitational field to the kinetic energy released as heat on impact with the ground. Our Sun transforms nuclear potential energy to other forms of energy; its total mass does not decrease due to that in itself (since it still contains the same total energy even if in different forms), but its mass does decrease when the energy escapes out to its surroundings, largely as radiant energy. There are strict limits to how efficiently heat can be converted into work in a cyclic process, e.g. in a heat engine, as described by Carnot's theorem and the second law of thermodynamics. However, some energy transformations can be quite efficient. The direction of transformations in energy (what kind of energy is transformed to what other kind) is often determined by entropy (equal energy spread among all available degrees of freedom) considerations. In practice all energy transformations are permitted on a small scale, but certain larger transformations are not permitted because it is statistically unlikely that energy or matter will randomly move into more concentrated forms or smaller spaces. Energy transformations in the universe over time are characterized by various kinds of potential energy that has been available since the Big Bang later being "released" (transformed to more active types of energy such as kinetic or radiant energy) when a triggering mechanism is available. Familiar examples of such processes include nuclear decay, in which energy is released that was originally "stored" in heavy isotopes (such as uranium and thorium), by nucleosynthesis, a process ultimately using the gravitational potential energy released from the gravitational collapse of supernovae, to store energy in the creation of these heavy elements before they were incorporated into the solar system and the Earth. This energy is triggered and released in nuclear fission bombs or in civil nuclear power generation. Similarly, in the case of a chemical explosion, chemical potential energy is transformed to kinetic energy and thermal energy in a very short time. Yet another example is that of a pendulum. At its highest points the kinetic energy is zero and the gravitational potential energy is at maximum. At its lowest point the kinetic energy is at maximum and is equal to the decrease of potential energy. If one (unrealistically) assumes that there is no friction or other losses, the conversion of energy between these processes would be perfect, and the pendulum would continue swinging forever. Energy is also transferred from potential energy (formula_8) to kinetic energy (formula_9) and then back to potential energy constantly. This is referred to as conservation of energy. In this closed system, energy cannot be created or destroyed; therefore, the initial energy and the final energy will be equal to each other. This can be demonstrated by the following: The equation can then be simplified further since formula_10 (mass times acceleration due to gravity times the height) and formula_11 (half mass times velocity squared). Then the total amount of energy can be found by adding formula_12. The fact that energy can be neither created nor be destroyed is called the law of conservation of energy. In the form of the first law of thermodynamics, this states that a closed system's energy is constant unless energy is transferred in or out by work or heat, and that no energy is lost in transfer. The total inflow of energy into a system must equal the total outflow of energy from the system, plus the change in the energy contained within the system. Whenever one measures (or calculates) the total energy of a system of particles whose interactions do not depend explicitly on time, it is found that the total energy of the system always remains constant. While heat can always be fully converted into work in a reversible isothermal expansion of an ideal gas, for cyclic processes of practical interest in heat engines the second law of thermodynamics states that the system doing work always loses some energy as waste heat. This creates a limit to the amount of heat energy that can do work in a cyclic process, a limit called the available energy. Mechanical and other forms of energy can be transformed in the other direction into thermal energy without such limitations. The total energy of a system can be calculated by adding up all forms of energy in the system. Richard Feynman said during a 1961 lecture: Most kinds of energy (with gravitational energy being a notable exception) are subject to strict local conservation laws as well. In this case, energy can only Energy transfer can be considered for the special case of systems which are closed to transfers of matter. The portion of the energy which is transferred by conservative forces over a distance is measured as the work the source system does on the receiving system. The portion of the energy which does not do work during the transfer is called heat. Energy can be transferred between systems in a variety of ways. Examples include Beyond the constraints of closed systems, open systems can gain or lose energy in association with matter transfer (both of Internal energy is the sum of all microscopic forms of energy of a system. It is the energy needed to create the system. It is related to the potential energy, The first law of thermodynamics asserts that energy (but not necessarily thermodynamic free energy) is always conserved and that heat flow is a form of energy transfer. For homogeneous systems, with a well-defined temperature and pressure, a commonly used corollary of the first law is that, for a system subject only to pressure forces and heat transfer (e.g., a cylinder-full of gas) without chemical changes, the differential change in the internal energy of the system (with a "gain" in energy signified by a positive quantity) is given as where the first term on the right is the heat transferred into the system, expressed in terms of temperature The energy of a mechanical harmonic oscillator (a mass on a spring) is alternatively kinetic and potential energy. At two points in the oscillation cycle it is entirely kinetic, and at two points it is entirely potential. Over the whole cycle, or over many cycles, net energy is thus equally split between kinetic and potential. This is called equipartition principle; total energy of a system with many degrees of freedom is equally split among all available degrees of freedom. This principle is vitally important to understanding the
In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton.
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summarize: An outline (algorithm) for what would have been the first piece of software was written by Ada Lovelace in the 19th century, for the planned Analytical Engine. She created proofs to show how the engine would calculate Bernoulli Numbers. Because of the proofs and the algorithm, she is considered the first computer programmer. The first theory about software—prior to the creation of computers as we know them today—was proposed by Alan Turing in his 1935 essay "On Computable Numbers, with an Application to the Entscheidungsproblem" (decision problem). This eventually led to the creation of the academic fields of computer science and software engineering; Both fields study software and its creation. Computer science is the theoretical study of computer and software (Turing's essay is an example of computer science), whereas software engineering is the application of engineering and development of software. However, prior to 1946, software was not yet the programs stored in the memory of stored-program digital computers, as we now understand it. The first electronic computing devices were instead rewired in order to "reprogram" them. In 2000, Fred Shapiro, a librarian at the Yale Law School, published a letter revealing that John Wilder Tukey's 1958 paper "The Teaching of Concrete Mathematics" contained the earliest known usage of the term "software" found in a search of JSTOR's electronic archives, predating the OED's citation by two years. This led many to credit Tukey with coining the term, particularly in obituaries published that same year, although Tukey never claimed credit for any such coinage. In 1995, Paul Niquette claimed he had originally coined the term in October 1953, although he could not find any documents supporting his claim. The earliest known publication of the term "software" in an engineering context was in August 1953 by Richard R. Carhart, in a Rand Corporation Research Memorandum. On virtually all computer platforms, software can be grouped into a few broad categories. Based on the goal, computer software can be divided into: Programming tools are also software in the form of programs or applications that software developers (also known as "programmers, coders, hackers" or "software engineers") use to create, debug, maintain (i.e. improve or fix), or otherwise support software. Software is written in one or more programming languages; there are many programming languages in existence, and each has at least one implementation, each of which consists of its own set of programming tools. These tools may be relatively self-contained programs such as compilers, debuggers, interpreters, linkers, and text editors, that can be combined together to accomplish a task; or they may form an integrated development environment (IDE), which combines much or all of the functionality of such self-contained tools. IDEs may do this by either invoking the relevant individual tools or by re-implementing their functionality in a new way. An IDE can make it easier to do specific tasks, such as searching in files in a particular project. Many programming language implementations provide the option of using both individual tools or an IDE. Users often see things differently from programmers. People who use modern general purpose computers (as opposed to embedded systems, analog computers and supercomputers) usually see three layers of software performing a variety of tasks: platform, application, and user software. Computer software has to be "loaded" into the computer's storage (such as the hard drive or memory). Once the software has loaded, the computer is able to "execute" the software. This involves passing instructions from the application software, through the system software, to the hardware which ultimately receives the instruction as machine code. Each instruction causes the computer to carry out an operation—moving data, carrying out a computation, or altering the control flow of instructions. Data movement is typically from one place in memory to another. Sometimes it involves moving data between memory and registers which enable high-speed data access in the CPU. Moving data, especially large amounts of it, can be costly. So, this is sometimes avoided by using "pointers" to data instead. Computations include simple operations such as incrementing the value of a variable data element. More complex computations may involve many operations and data elements together. Software quality is very important, especially for commercial and system software like Microsoft Office, Microsoft Windows and Linux. If software is faulty (buggy), it can delete a person's work, crash the computer and do other unexpected things. Faults and errors are called "bugs" which are often discovered during alpha and beta testing. Software is often also a victim to what is known as software aging, the progressive performance degradation resulting from a combination of unseen bugs. Many bugs are discovered and eliminated (debugged) through software testing. However, software testing rarely—if ever—eliminates every bug; some programmers say that "every program has at least one more bug" (Lubarsky's Law). In the waterfall method of software development, separate testing teams are typically employed, but in newer approaches, collectively termed agile software development, developers often do all their own testing, and demonstrate the software to users/clients regularly to obtain feedback. Software can be tested through unit testing, regression testing and other methods, which are done manually, or most commonly, automatically, since the amount of code to be tested can be quite large. For instance, NASA has extremely rigorous software testing procedures for many operating systems and communication functions. Many NASA-based operations interact and identify each other through command programs. This enables many people who work at NASA to check and evaluate functional systems overall. Programs containing command software enable hardware engineering and system operations to function much easier together. The software's license gives the user the right to use the software in the licensed environment, and in the case of free software licenses, also grants other rights such as the right to make copies. Proprietary software can be divided into two types: Open-source software, on the other hand, comes with a free software license, granting the recipient the rights to modify and redistribute the software. Software patents, like other types of patents, are theoretically supposed to give an inventor an exclusive, time-limited license for a "detailed idea (e.g. an algorithm) on how to implement" a piece of software, or a component of a piece of software. Ideas for useful things that software could "do", and user "requirements", are not supposed to be patentable, and concrete implementations (i.e. the actual software packages implementing the patent) are not supposed to be patentable either—the latter are already covered by copyright, generally automatically. So software patents are supposed to cover the middle area, between requirements and concrete implementation. In some countries, a requirement for the claimed invention to have an effect on the physical world may also be part of the requirements for a software patent to be held valid—although since "all" useful software has effects on the physical world, this requirement may be open to debate. Meanwhile, American copyright law was applied to various aspects of the writing of the software code. Software patents are controversial in the software industry with many people holding different views about them. One of the sources of controversy is that the aforementioned split between initial ideas and patent does not seem to be honored in practice by patent lawyers—for example the patent for Aspect-Oriented Programming (AOP), which purported to claim rights over "any" programming tool implementing the idea of AOP, howsoever implemented. Another source of controversy is the effect on innovation, with many distinguished experts and companies arguing that software is such a fast-moving field that software patents merely create vast additional litigation costs and risks, and actually retard innovation. In the case of debates about software patents outside the United States, the argument has been made that large American corporations and patent lawyers are likely to be the primary beneficiaries of allowing or continue to allow software patents. Design and implementation of software varies depending on the complexity of the software. For instance, the design and creation of Microsoft Word took much more time than designing and developing Microsoft Notepad because the latter has much more basic functionality. Software is usually designed and created (aka coded/written/programmed) in integrated development environments (IDE) like Eclipse, IntelliJ and Microsoft Visual Studio that can simplify the process and compile the software (if applicable). As noted in a different section, software is usually created on top of existing software and the application programming interface (API) that the underlying software provides like GTK+, JavaBeans or Swing. Libraries (APIs) can be categorized by their purpose. For instance, the Spring Framework is used for implementing enterprise applications, the Windows Forms library is used for designing graphical user interface (GUI) applications like Microsoft Word, and Windows Communication Foundation is used for designing web services. When a program is designed, it relies upon the API. For instance, a Microsoft Windows desktop application might call API functions in the.NET Windows Forms library like "Form1.Close()" and "Form1.Show()" to close or open the application. Without these APIs, the programmer needs to write these functionalities entirely themselves. Companies like Oracle and Microsoft provide their own APIs so that many applications are written using their software libraries that usually have numerous APIs in them. Data structures such as hash tables, arrays, and binary trees, and algorithms such as quicksort, can be useful for creating software. Computer software has special economic characteristics that make its design, creation, and distribution different from most other economic goods. A person who creates software is called a programmer, software engineer or software developer, terms that all have a similar meaning. More informal terms for programmer also exist such as "coder" and "hacker"although use of the latter word may cause confusion, because it is more often used to mean someone who illegally breaks into computer systems. A great variety of software companies and programmers in the world comprise a software industry. Software can be quite a profitable industry: Bill Gates, the co-founder of Microsoft was the richest person in the world in 2009, largely due to his ownership of a significant number of shares in Microsoft, the company responsible for Microsoft Windows and Microsoft Office software products - both market leaders in their respective product categories. Non-profit software organizations include the Free Software Foundation, GNU Project and the Mozilla Foundation. Software standard organizations like the W3C, IETF develop recommended software standards such as XML, HTTP and HTML, so that software can interoperate through these standards. Other well-known large software companies include Google, IBM, TCS, Infosys, Wipro, HCL Technologies, Oracle, Novell, SAP, Symantec, Adobe Systems, Sidetrade and Corel, while small companies often provide innovation.
Computer software, or simply software, is a collection of data or computer instructions that tell the computer how to work. This is in contrast to physical hardware, from which the system is built and actually performs the work. In computer science and software engineering, computer software is all information processed by computer systems, programs and data. Computer software includes computer programs, libraries and related non-executable data, such as online documentation or digital media. Computer hardware and software require each other and neither can be realistically used on its own.
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summarize: The Americas are usually accepted as having been named after the Italian explorer Amerigo Vespucci by the German cartographers Martin Waldseemüller and Matthias Ringmann. Vespucci, who explored South America between 1497 and 1502, was the first European to suggest that the Americas were not the East Indies, but a different landmass previously unknown by Europeans. In 1507, Waldseemüller produced a world map, in which he placed the word "America" on the continent of South America, in the middle of what is today Brazil. He explained the rationale for the name in the accompanying book "Cosmographiae Introductio": For Waldseemüller, no one should object to the naming of the The United Nations formally recognizes "North America" as comprising three areas: Northern America, Central America, and The Caribbean. This has been formally defined by the UN Statistics Division. "Northern America", as a term distinct from "North America", excludes Central America, which itself may or may not include Mexico (see ). In the limited context of the North American Free Trade Agreement, the term covers Canada, the United States, and Mexico, which are the three signatories of that treaty. France, Italy, Portugal, Spain, Romania, Greece, and the countries of Latin America use a six-continent model, with the Americas viewed as a single continent and "North America" designating a subcontinent comprising Canada, the United States, and Mexico, and often Greenland, Saint Pierre et Miquelon, and Bermuda. North America has been historically referred to by other names. Spanish North America (New Spain) was often referred to as "Northern America", and this was the first official name given to Mexico. Geographically the North American continent has many regions and subregions. These include cultural, economic, and geographic regions. Economic regions included those formed by trade blocs, such as the North American Trade Agreement bloc and Central American Trade Agreement. Linguistically and culturally, the continent could be divided into Anglo-America and Latin America. Anglo-America includes most of Northern America, Belize, and Caribbean islands with English-speaking populations (though sub-national entities, such as Louisiana and Quebec, have large Francophone populations; in Quebec, French is the sole official language). The southern North American continent is composed of two regions. These are Central America and the Caribbean. The north of the continent maintains recognized regions as well. In contrast to the common definition of "North America", which encompasses the whole continent, the term "North Laurentia is an ancient craton which forms the geologic core of North America; it formed between 1.5 and 1.0 billion years ago during the Proterozoic eon. The Canadian Shield is the largest exposure of this craton. From the Late Paleozoic to Early Mesozoic eras, North America was joined with the other modern-day continents as part of the supercontinent Pangaea, with Eurasia to its east. One of the results of the formation of Pangaea was the Appalachian Mountains, which formed some 480 million years ago, making it among the oldest mountain ranges in the world. When Pangaea began to rift around 200 million years ago, North America became part of Laurasia, before it separated from Eurasia as its own The indigenous peoples of the Americas have many creation myths by which they assert that they have been present on the land since its creation, but there is no evidence that humans evolved there. The specifics of the initial settlement of the Americas by ancient Asians are subject to ongoing research and discussion. The traditional theory has been that hunters entered the Beringia land bridge between eastern Siberia and present-day Alaska from 27,000 to 14,000 years ago. A growing viewpoint is that the first American inhabitants sailed from Beringia some During the Age of Discovery, Europeans explored and staked claims to various parts of North America. Upon their arrival in the "New World", the Native American population declined substantially, because of violent conflicts with the invaders and the introduction of European diseases to which the Native Americans lacked immunity. Native culture changed drastically and their affiliation with political and cultural groups also changed. Several linguistic groups died out, and others changed quite quickly. The names and cultures that Europeans recorded were not necessarily the same as the names they had used a few generations before, or the ones in use today. North America occupies the northern portion of the landmass generally referred to as the New World, the Western Hemisphere, the Americas, or simply America (which, less commonly, is considered by some as a single continent with North America a subcontinent). North America's only land connection to South America is at the Isthmus of Darian/ Isthmus of Panama. The continent is delimited on the southeast by most geographers at the Darién watershed along the Colombia-Panama border, placing almost all of Panama within North America. Alternatively, some geologists physiographically locate its southern limit at the Isthmus of Tehuantepec, Mexico, with Central America extending southeastward to South America from this point. The Caribbean islands, or West Indies, are considered part of North America. The continental coastline is long and irregular. The Gulf of Mexico is the largest body of water indenting the continent, followed by Hudson Bay. Others include the Gulf of Saint Lawrence and the Gulf of California. Before the Central American isthmus formed, the region had been underwater. The islands of the West Indies delineate a submerged former land bridge, which had connected North and South America via what are now Florida and Venezuela. There are numerous islands off the continent's coasts; principally, the Arctic Archipelago, the Bahamas, Turks & Caicos, the Greater and Lesser Antilles, the Aleutian Islands (some of which are in the Eastern Hemisphere proper), the Alexander Archipelago, the many thousand islands of the British Columbia Coast, and Newfoundland. Greenland, a self-governing Danish island, and the world's largest, is on the same tectonic plate (the North American Plate) and is part of North America geographically. In a Geologically, Canada is one of the oldest regions in the world, with more than half of the region consisting of precambrian rocks that have been above sea level since the beginning of the Palaeozoic era. Canada's mineral resources are diverse and extensive. Across the Canadian Shield and in the north there are large iron, nickel, zinc, copper, gold, lead, molybdenum, and uranium reserves. Large diamond concentrations have been recently developed in the The lower 48 US states can be divided into roughly five physiographic provinces: The geology Central America is geologically active with volcanic eruptions and earthquakes occurring from time to time. In 1976 Guatemala was hit by a major earthquake, killing 23,000 people; Managua, the capital of Nicaragua, was devastated by earthquakes in 1931 and 1972, the last one killing about 5,000 people; three earthquakes devastated El Salvador, one in 1986 and two in 2001; one earthquake devastated northern and central Costa Rica in 2009, killing at least 34 people; in Honduras North America is a very large continent which surpasses the Arctic Circle, and the Tropic of Cancer. Greenland, along with the Canadian Shield, is tundra with average temperatures ranging from, but central Greenland is composed of a very large ice sheet. This tundra radiates throughout Canada, but its border ends near the Rocky Mountains (but still contains Alaska) and at the end of the Canadian Shield, near the Great Lakes. Climate west of the Cascades is described as being a temperate weather with average precipitation. Climate in coastal California is described to be Mediterranean, with average temperatures in cities like San Francisco ranging from over the course of the year. Stretching from the East Coast to eastern North Dakota, and stretching Notable North American fauna include the bison, black bear, prairie dog, turkey, pronghorn, raccoon, coyote and Economically, Canada and the United States are the wealthiest and most developed nations in the continent, followed by Mexico, a newly industrialized country. The countries of Central America and the Caribbean are at various levels of economic and human development. For example, small Caribbean island-nations, such as Barbados, Trinidad and Tobago, and Antigua and Barbuda, have a higher GDP (PPP) per capita than Mexico due to their smaller populations. Panama and Costa Rica have a significantly higher Human Development Index and GDP than the rest of the Central American nations. Additionally, despite Greenland's vast resources in oil and minerals, much of them remain untapped, and the island is economically dependent on fishing, tourism, and subsidies from Denmark. Nevertheless, the island is highly developed. Demographically, North America is ethnically diverse. Its three main groups are Caucasians, Mestizos and Blacks. There is a significant minority of Indigenous Americans and Asians among other less numerous groups. The dominant languages in North America are English, Spanish, and French. Danish is prevalent in Greenland alongside Greenlandic, and Dutch is spoken side by side local languages in the Dutch Caribbean. The term Anglo-America is used to refer to the anglophone countries of the Americas: namely Canada (where English and French are co-official) and the United States, but also sometimes Belize and parts of the tropics, especially the Commonwealth Caribbean. Latin America refers to the other areas of the Americas (generally south of the United States) where the Romance languages, derived from Latin, of Spanish and Portuguese (but French speaking countries are not usually included) predominate: the other republics of Central America (but not always Belize), part of Christianity is the largest religion in the United States, Canada and Mexico. According to a 2012 Pew Research Center survey, 77% of the population considered themselves Christians. Christianity also is the predominant religion in the 23 dependent territories in North America. The United States has the largest Christian population in the world, with nearly 247 million Christians (70%), although other countries have higher percentages of Christians among their populations. Mexico has the world's second largest number of Catholics, surpassed only by Brazil. A 2015 study estimates about 493,000 Christian believers from a Muslim background in North America, most of them belonging to some form of Protestantism. According to the same study religiously unaffiliated (include agnostic and atheist) make up about 17% of the population of Canada and the United States. No religion make up about 24% of the United States population, The most populous country in North America is the United States with 329.7 million persons. The second largest country is Mexico with a population of 112.3 million. Canada is the third most populous country with 37.0 million. The majority of Caribbean island-nations have national populations under a million, though Cuba, Dominican Republic, Haiti, Puerto Rico (a territory of the United States), Jamaica, and Trinidad and Tobago each have populations higher than a million. Greenland has a small population of 55,984 for its massive size (2,166,000 km2 or 836,300 mi2), and therefore, it has the world's lowest population density at 0.026 pop./km2 (0.067 pop./mi2). North America's GDP per capita was evaluated in October 2016 by the International Monetary Fund (IMF) to be $41,830, making it the richest continent in the world, followed by Oceania. Canada, Mexico, and the United States have significant and multifaceted economic systems. The United States has the largest economy of all three countries and in the world. In 2016, the U.S. had an estimated per capita gross domestic product (PPP) of $57,466 according to the World Bank, and is the most technologically developed economy of the three. The United States' services sector comprises 77% of the country's GDP (estimated in 2010), industry comprises 22% and agriculture comprises 1.2%. The U.S. economy is also the fastest growing economy in North America and the Americas as a whole, with the highest GDP per capita in the Americas as well. Canada shows significant growth in the sectors of services, mining and manufacturing. Canada's per capita GDP (PPP) was estimated at $44,656 and it had the 11th largest GDP (nominal) in 2014. Canada's services sector comprises 78% of the country's GDP (estimated in 2010), industry comprises 20% and agriculture comprises 2%. Mexico has a per capita GDP (PPP) of $16,111 and as of 2014 is the 15th largest GDP (nominal) in the world. Being a newly industrialized country, Mexico maintains both modern and outdated industrial and agricultural facilities and operations. Its main sources of income are oil, industrial exports, manufactured goods, electronics, heavy industry, automobiles, construction, food, banking and financial services. The North American economy is well defined and structured in three main economic areas. These areas are the North American Free Trade Agreement (NAFTA), Caribbean Community and Common Market (CARICOM), and the Central American Common Market (CACM). Of these trade blocs, the United States takes part in two. In addition to the larger trade blocs there is the Canada-Costa Rica Free Trade Agreement among numerous other free trade relations, often between the larger, more developed countries and Central American and Caribbean countries. The North America Free Trade Agreement (NAFTA) forms one of the four largest trade blocs in the world. Its implementation in 1994 was designed for economic homogenization with hopes of eliminating barriers of trade and foreign investment between Canada, the United States and Mexico. While Canada and the United States already conducted the largest bilateral trade relationship – and to present day still do – in the world and Canada–United States trade relations already allowed trade without national taxes and tariffs, NAFTA allowed Mexico to experience a similar duty-free trade. The free trade agreement allowed for the elimination of tariffs that had previously been in place on United States-Mexico trade. Trade volume has steadily increased annually and in 2010, surface trade between the three NAFTA nations reached an all-time historical increase of 24.3% or US$791 billion. The NAFTA trade bloc GDP (PPP) is the world's largest with US$17.617 trillion. This is in part attributed to the fact that the economy of the United States is the world's largest national economy; the country had a nominal GDP of approximately $14.7 trillion in 2010. The countries of NAFTA are also some of each other's largest trade partners. The United States is the largest trade partner of Canada and Mexico; while Canada and Mexico are each other's third largest trade partners. The Caribbean trade bloc – CARICOM – came into agreement in 1973 when it was signed by 15 Caribbean nations. As of 2000, CARICOM trade volume was US$96 billion. CARICOM also allowed for the creation of a common passport for associated nations. In the past decade the trade bloc focused largely on Free Trade Agreements and under the CARICOM Office of Trade Negotiations (OTN) free trade agreements have been signed into effect. Integration of Central American economies occurred under the signing of the Central American Common Market agreement in 1961; this was the first attempt to engage the nations of this area into stronger financial cooperation. Recent implementation of the Central American Free Trade Agreement (CAFTA) has left the future of the CACM unclear. The Central American Free Trade Agreement was signed by five Central American countries, the Dominican Republic, and the United States. The focal point of CAFTA is to create a free trade area similar to that of NAFTA. In addition to the United States, Canada also has relations in Central American trade blocs. Currently under proposal, the Canada – Central American Free Trade Agreement (CA4) would operate much the same as CAFTA with the United States does. These nations also take part in inter-continental trade blocs. Mexico takes a part in the G3 Free Trade Agreement with Colombia and Venezuela and has a trade agreement with the EU. The United States has proposed and maintained trade agreements under the Transatlantic Free Trade Area between itself and the European Union; the US-Middle East Free Trade Area between numerous Middle Eastern nations and itself; and the Trans-Pacific Strategic Economic Partnership between Southeast Asian nations, Australia, and New Zealand. Canada and the United States were both former British colonies. There is frequent cultural interplay between the United States and English-speaking Canada. Greenland has experienced many immigration waves from Northern Canada, e.g. the Thule People. Therefore, Greenland shares some cultural ties with the indigenous people of Canada. Greenland is also considered Nordic and has strong Danish ties due to centuries of colonization by Denmark. Spanish-speaking North America shares a common past as former Spanish colonies. In Mexico and the Central American countries where civilizations like the Maya developed, indigenous people preserve traditions across modern boundaries. Central American and Spanish-speaking Caribbean nations have historically had more in common due to geographical proximity. Northern Mexico, particularly in the cities of Monterrey, Tijuana, Ciudad Juárez, and Mexicali, is strongly influenced by the culture and way of life of the United States. Of the aforementioned cities, Monterrey has been regarded as the most Americanized city in Mexico. Immigration to the United States and Canada remains a significant attribute of many nations close to the southern border of the US. The Anglophone Caribbean states have witnessed the decline of the British Empire and its influence on the region, and its replacement by the economic influence of Northern America in the Anglophone Caribbean. This is partly due to the relatively small populations of the English-speaking Caribbean countries, and also because many of them now have more people living abroad than those remaining at home. Northern Mexico, the Western United States and Alberta, Canada share a cowboy culture. Canada, Mexico and the US submitted a joint bid to host the 2026 Footnotes Citations
North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere. It can also be described as a northern subcontinent of the Americas, or America, in models that use fewer than seven continents. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the west and south by the Pacific Ocean, and to the southeast by South America and the Caribbean Sea.
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summarize: South America occupies the southern portion of the Americas. The continent is generally delimited on the northwest by the Darién watershed along the Colombia–Panama border, although some may consider the border instead to be the Panama Canal. Geopolitically and geographically all of Panama – including the segment east of the Panama Canal in the isthmus – is typically included in North America alone and among the countries of Central America. Almost all of mainland South America sits on the South American Plate. South America is home to the world's highest uninterrupted waterfall, Angel Falls in Venezuela; the highest single drop waterfall Kaieteur Falls in Guyana; the largest river by volume, the Amazon River; the longest mountain range, the Andes (whose highest mountain is Aconcagua at ); the driest non-polar place on earth, the Atacama Desert; the largest rainforest, the Amazon Rainforest; the highest capital city, La Paz, Bolivia; the highest commercially navigable lake in the world, Lake Titicaca; and, excluding research stations in Antarctica, the world's southernmost permanently inhabited community, Puerto Toro, Chile. South America's major mineral resources are gold, silver, copper, iron ore, tin, and petroleum. These resources found in South America have brought high income to its countries especially in times of war or of rapid economic growth by industrialized countries elsewhere. However, the concentration in producing one major export commodity often has hindered the development of diversified economies. The fluctuation in the price of commodities in the international markets has led historically to major highs and lows in the economies of South American states, often causing extreme political instability. This is leading to efforts to diversify production to drive away from staying as economies dedicated to one major export. South America is one of the most biodiverse continents on earth. South America is home to many interesting and unique species of animals including the llama, anaconda, piranha, jaguar, vicuña, and tapir. The Amazon rainforests possess high biodiversity, containing a major proportion of the Earth's species. Brazil is the largest country in South America, encompassing around half of the continent's land area and population. The remaining countries and territories are divided among three regions: The Andean States, the Guianas and the Southern Cone. Traditionally, South America also includes some of the nearby islands. Aruba, Bonaire, Curaçao, Trinidad, Tobago, and the federal dependencies of Venezuela sit on the northerly South American continental shelf and are often considered part of the continent. Geo-politically, the island states and overseas territories of the Caribbean are generally grouped as a part or subregion of North America, since they are more distant on the Caribbean Plate, even though San Andres and The distribution of the average temperatures in the region presents a constant regularity from the 30° of latitude south, when the isotherms tend, more and more, to be confused with the degrees of latitude. In temperate latitudes, winters are milder and summers warmer than in North America. Because its most extensive part of the continent is in the equatorial zone, the region has more areas of equatorial plains than any other region. The average annual temperatures in the Amazon basin oscillate around South America is believed to have been joined with Africa from the late Paleozoic Era to the early Mesozoic Era, until the supercontinent Pangaea began to rift and break apart about 225 million years ago. Therefore, South America and Africa share similar fossils and rock layers. South America is thought to have been first inhabited by humans when people were crossing the Bering Land Bridge (now the Bering Strait) at least 15,000 years ago from the territory that is present-day Russia. They migrated south through North America, and eventually reached South America through the Isthmus of Panama. The rise of plant growing and the subsequent appearance of permanent human settlements allowed for the multiple and overlapping beginnings of civilizations in South America. One of the earliest known South American civilizations was at Norte Chico, on the central Peruvian coast. Though a pre-ceramic culture, the monumental architecture of Norte Chico is contemporaneous with the pyramids of Ancient Egypt. Norte Chico governing class established a trade network and developed agriculture then followed by Chavín by 900 BC, according to some estimates and archaeological finds. Artifacts were found at a site called Chavín de Huantar in modern Peru at an elevation of. Chavín civilization spanned 900 BC to 300 BC. In the central coast of Peru, around the beginning of the 1st millennium AD, Moche (100 BC – 700 AD, at the northern coast of Peru), Paracas and Nazca (400 BC – 800 AD, Peru) cultures flourished with centralized states with permanent militia improving agriculture In 1494, Portugal and Spain, the two great maritime European powers of that time, on the expectation of new lands being discovered in the west, signed the Treaty of Tordesillas, by which they agreed, with the support of the Pope, that all the land outside Europe should be an exclusive duopoly between the two countries. The treaty established an imaginary line along a north–south meridian 370 leagues west of the Cape Verde Islands, roughly 46° 37' W. In terms of the treaty, all land to the The indigenous peoples of the Americas in various European colonies were forced to work in European plantations and mines; along with African slaves who were also introduced in the proceeding centuries. The colonists were heavily dependent on indigenous labor during the initial phases of European settlement to maintain the subsistence economy, and natives were often captured by expeditions. The importation of African slaves began midway through the 16th century, but the enslavement of indigenous peoples continued well into the 17th and 18th centuries. The Atlantic slave trade brought African slaves primarily to South American colonies, beginning with the Portuguese since 1502. The main destinations of this phase were the Caribbean colonies and Brazil, as European nations built The European Peninsular War (1807–1814), a theater of the Napoleonic Wars, changed the political situation of both the Spanish and Portuguese colonies. First, Napoleon invaded Portugal, but the House of Braganza avoided capture by escaping to Brazil. Napoleon also captured King Ferdinand VII of Spain, and appointed his own brother instead. This appointment provoked severe popular resistance, which created Juntas to rule in the name of the captured king. Many cities in the Spanish colonies, however, considered themselves equally authorized to appoint local Juntas like those of Spain. This began the Spanish American wars of independence between the patriots, who promoted such autonomy, and the royalists, who supported Spanish authority over the Americas. The Juntas, in both Spain and the Americas, promoted the ideas of the Enlightenment. Five years after the beginning of the The newly independent nations began a process of fragmentation, with several civil and international wars. However, it was not as strong as in Central America. Some countries created from provinces of larger countries stayed as such up to modern times (such as Paraguay or Uruguay), while others were reconquered and reincorporated into their former countries (such as the Republic of Entre Ríos and the Riograndense Republic). The first separatist attempt was in 1820 by the Argentine province of Entre Ríos, led by a caudillo. In spite of the "Republic" in its title, General Ramírez, its caudillo, never really intended to declare an independent Entre Rios. Rather, he was making a political statement in opposition to the monarchist and centralist ideas that back then permeated Buenos Aires politics. The "country" was reincorporated at Despite the Spanish American wars of independence and the Brazilian War of Independence, the new nations quickly began to suffer with internal conflicts and wars among themselves. In 1825 the proclamation of independence of Cisplatina led to the Cisplatine War between historical rivals the Empire of Brazil and the United Provinces of the Río de la Plata, Argentina's predecessor. The result was a stalemate, ending with the British arranging for the independence of Uruguay. Soon after, another Brazilian province proclaimed its independence leading to the Ragamuffin War which Brazil won. Between 1836 and 1839 the War of the Confederation broke out between the short-lived Peru-Bolivian Confederation and Chile, with the support of the Argentine Confederation. The war was fought mostly in the actual territory of Peru and ended with a Confederate defeat and the dissolution of the Confederacy and annexation of many territories by Argentina. Meanwhile, the Argentine Civil Wars plagued Argentina since its independence. The conflict was mainly between those who defended Wars became less frequent in the 20th century, with Bolivia-Paraguay and Peru-Ecuador fighting the last inter-state wars. Early in the 20th century, the three wealthiest South American countries engaged in a vastly expensive naval arms race which was catalyzed by the introduction of a new warship type, the "dreadnought". At one point, the Argentine government was spending a fifth of its entire yearly budget for just two dreadnoughts, a price that did not include later in-service costs, which for the Brazilian dreadnoughts was sixty percent of the initial purchase. The continent became a battlefield of the Cold War in the late 20th century. Some democratically elected governments of Argentina, Brazil, Chile, Uruguay and Paraguay were overthrown or displaced by military dictatorships in the 1960s and 1970s. To curtail opposition, their governments detained tens of thousands of political prisoners, many of whom were tortured and/or killed on inter-state collaboration. Economically, they began a transition to neoliberal economic policies. They placed their own actions within the US Cold War doctrine of "National Security" against internal subversion. Throughout the 1980s and 1990s, Peru suffered from an Historically, the Hispanic countries were founded as Republican dictatorships led by caudillos. Brazil was the only exception, being a constitutional monarchy for its first 67 years of independence, until a coup d'état proclaimed a republic. In the late 19th century, the most democratic countries were Brazil, Chile, Argentina and Uruguay. In the interwar period, nationalism grew stronger on the continent, influenced by countries like Nazi Germany and Fascist Italy. A series of authoritarian rules broke out in South American countries with views bringing them closer to the Axis Powers, like Vargas's Brazil. In the late 20th century, during the Cold War, many countries became military dictatorships under American tutelage in attempts to avoid the influence of the Soviet Union. After the fall of the authoritarian regimes, these countries became democratic republics. During the first decade of the 21st century, South America has over million inhabitants and a population growth rate of about 0.6% per year. There are several areas of sparse demographics such as tropical forests, the Atacama Desert and the icy portions of Patagonia. On the other hand, the continent presents regions of high population density, such as the great urban centers. The population is formed by descendants of Europeans (mainly Spaniards, Portuguese and Italians), Africans and Indigenous peoples. There is a high percentage of mestizos that vary greatly in composition by place. There is also a minor population of Asians, especially in Brazil. The two main languages are by far Spanish and Portuguese, followed by French, English and Dutch in smaller numbers. Spanish and Portuguese are the most spoken languages in South America, with approximately 200 million speakers each. Spanish is the official language of most countries, along with other native languages in some countries. Portuguese is the official language of Brazil. Dutch is the official language of Suriname; English is the official language of Guyana, although there are at least twelve other languages spoken in the country, including Portuguese, Chinese, Hindustani and several native languages. English is also spoken in the Falkland Islands. French is the official language of French Guiana and the second language in Amapá, Brazil. Indigenous languages of South America include Quechua in Peru, Bolivia, Ecuador, Chile and Colombia; Wayuunaiki in northern Colombia (La Guajira) An estimated 90% of South Americans are Christians (82% Roman Catholic, 8% other Christian denominations mainly traditional Protestants and Evangelicals but also Orthodox), accounting for c. 19% of Christians worldwide. African descendent religions and Indigenous religions are also common throughout all South America, some examples of are Santo Daime, Candomblé, Umbanda and Encantados. Crypto-Jews or Marranos, Genetic admixture occurs at very high levels in South America. In Argentina, the European influence accounts for 65–79% of the genetic background, Amerindian for 17–31% and sub-Saharan African for 2–4%. In Colombia, the sub-Saharan African genetic background varied from 1% to 89%, while the European genetic background varied from 20% to 79%, depending on the region. In Peru, European ancestries ranged from 1% to 31%, while the African contribution was only 1% to 3%. The Genographic Project determined the average Peruvian from Lima had about 28% European ancestry, 68% Native American, 2% Asian ancestry and 2% sub-Saharan African. Descendants of indigenous peoples, such as the Quechua and Aymara, or the Urarina of Amazonia make up the majority of the population in Bolivia (56%) and, per some sources, in Peru (44%). In Ecuador, Amerindians In many places indigenous people still practice a traditional lifestyle based on subsistence agriculture or as hunter-gatherers. There are still some uncontacted tribes residing in the Amazon Rainforest. The most populous country in South America is Brazil with million people. The second largest country is Colombia with a population of. Argentina is the third most populous country with. While Brazil, Argentina, and Colombia maintain the largest populations, large city populations are not restricted to those nations. The largest cities in South America, by far, are São Paulo, Rio de Janeiro, Buenos Aires, Santiago, Lima, and Bogotá. These cities are the only cities on the continent to exceed eight million, and three of five in the Americas. Next in size are Caracas, Belo Horizonte, Medellin and Salvador. Five of the top South America relies less on the export of both manufactured goods and natural resources than the world average; merchandise exports from the continent were 16% of GDP on an exchange rate basis, compared to 25% for the world as a whole. Brazil (the seventh largest economy in the world and the largest in South America) leads in terms of merchandise exports at $251 billion, followed by Venezuela at $93 billion, Chile at $86 billion, and Argentina at $84 billion. Since 1930, the continent has experienced remarkable growth and diversification in most economic sectors. Most agricultural and livestock products are destined for the domestic market and local consumption. However, the export of agricultural products is essential for the balance of trade in most countries. The main agrarian crops are export crops, such as soy and wheat. The production of staple foods such as vegetables, corn or beans is large, but focused on domestic consumption. Livestock raising for meat exports is important in Argentina, Paraguay, Uruguay and Colombia. In tropical regions the most important crops are coffee, cocoa and bananas, mainly in Brazil, Colombia and Ecuador. Traditionally, the countries producing sugar for export are Peru, Guyana and Suriname, and in Brazil, sugar cane is also used to make ethanol. On the coast of Peru, northeast and south of Brazil, cotton is grown. Fifty percent of the South American surface is covered by forests, but timber industries are small and directed to domestic markets. In recent years, however, transnational companies have been settling in the Amazon to exploit noble timber destined for export. The Pacific coastal waters of South America are the most important for commercial fishing. The anchovy catch reaches thousands of tons, and tuna is also abundant (Peru is a major exporter). The capture of crustaceans is remarkable, particularly in northeastern Brazil and Chile. Only Brazil and Argentina are part of the G20 (industrial countries), while only Brazil is part of the G8+5 (the most powerful and influential nations in the world). In the tourism sector, a series of negotiations began in 2005 to promote tourism and increase air connections within the region. Punta del Este, Florianópolis and Mar del Plata are among the most important resorts in South America. The most industrialized countries in South America are Brazil, Argentina, Chile, Colombia, Venezuela and Uruguay respectively. These countries alone account for more than 75 percent of the region's economy and add up to a GDP of more than US$3.0 trillion. Industries in South America began to take on the economies of the region from the 1930s when the Great Depression in the United States and other countries of the world boosted industrial production in the continent. From that period the region left the agricultural side behind and began to achieve high rates of economic growth that remained until the early 1990s when they slowed due to political instabilities, economic crises and neoliberal policies. Since the end of the economic crisis in Brazil and Argentina that occurred in the period from 1998 to 2002, which has led to economic recession, rising unemployment and falling population income, the industrial and service sectors have been recovering rapidly. Chile, Argentina and Brazil have recovered fastest, growing at an average of 5% per year. All of South America after this period has been recovering and showing good signs of economic stability, with controlled inflation and exchange rates, continuous growth, a decrease in social inequality and unemployment–factors that favor industry. The main industries are: electronics, textiles, food, automotive, metallurgy, aviation, naval, clothing, beverage, steel, tobacco, timber, chemical, among others. Exports reach almost US$400 billion annually, with Brazil accounting for half of this. The economic gap between the rich and poor in most South American nations is larger than on most other continents. The richest 10% receive over 40% of the nation's income in Bolivia, Brazil, Chile, Colombia, and Paraguay, while the poorest 20% receive 4% or less in Bolivia, Brazil, and Colombia. This wide gap can be seen in many large South American cities where makeshift shacks and slums lie in the vicinity of skyscrapers and upper-class luxury apartments; nearly one in nine South Americans live on less than $2 per day (on a purchasing power parity basis). South Americans are culturally influenced by their indigenous peoples, the historic connection with the Iberian Peninsula and Africa, and waves of immigrants from around the globe. South American nations have a rich variety of music. Some of the most famous genres include vallenato and cumbia from Colombia, pasillo from Colombia and Ecuador, samba, bossa nova and música sertaneja from Brazil, and tango from Argentina and Uruguay. Also well known is the non-commercial folk genre Nueva Canción movement which was founded in Argentina and Chile and quickly spread to the rest of the Latin America. People on the Peruvian coast created the fine guitar and cajon duos or trios in the most mestizo (mixed) of South American rhythms such as the Marinera (from Lima), the Tondero (from Piura), the 19th century popular Creole Valse or Peruvian Valse, the soulful Arequipan Yaravi, and the early 20th century Paraguayan Guarania. In the late 20th century, Spanish rock emerged by young hipsters influenced by British pop and American rock. Brazil has a Portuguese-language pop rock industry as well a great variety of other music genres. In the central and western regions of Bolivia, Andean and folklore music like Diablada, Caporales and Morenada are the most representative of the country, which were originated by European, Aymara and Quechua influences. The literature of South America has attracted considerable critical and popular acclaim, especially with the Latin American Boom of the 1960s and 1970s, and the rise of authors such as Mario Vargas Llosa, Gabriel García Márquez in novels and Jorge Luis Borges and Pablo Neruda in other genres. The Brazilians Machado de Assis and João Guimarães Rosa are widely regarded as the greatest Brazilian writers. Because of South America's broad ethnic mix, South American cuisine has African, South American Indian, South Asian, East Asian, and European influences. Bahia, Brazil, is especially well known for its West African–influenced cuisine. Argentines, Chileans, Uruguayans, Brazilians, Bolivians, and Venezuelans regularly consume wine. People in Argentina, Paraguay, Uruguay, southern Chile, Bolivia and Brazil drink mate, an herb which is brewed. The Paraguayan version, terere, differs from other forms of mate in that it is served cold. Pisco is a liquor distilled from grapes in Peru and Chile. Peruvian cuisine mixes elements from Chinese, Japanese, Spanish, Italian, African, Arab, Andean, and Amazonic food. The artist Oswaldo Guayasamín (1919–1999) from Ecuador, represented with his painting style the feeling of the peoples of Latin America highlighting social injustices in various parts of the world. The Colombian Fernando Botero (1932) is one of the greatest exponents of painting and sculpture that continues still active and has been able A wide range of sports are played in the continent of South America, with football being the most popular overall, while baseball is the most popular in Venezuela. Other sports include basketball, cycling, polo, volleyball, futsal, motorsports, rugby (mostly in Argentina and Uruguay), handball, tennis, golf, field hockey, boxing and cricket. South America hosted its first Olympic Games in Rio de Janeiro, Brazil in 2016 and will host the Youth Olympic Games in Buenos Aires, Argentina in 2018. South America shares with Europe supremacy over the sport of football as all winners in FIFA World Cup history and all winning teams in the FIFA Club World Cup have come from these two continents. Brazil holds the Due to the diversity of topography and pluviometric precipitation conditions, the region's water resources vary enormously in different areas. In the Andes, navigation possibilities are limited, except for the Magdalena River, Lake Titicaca and the lakes of the southern regions of Chile and Argentina. Irrigation is an important factor for agriculture from northwestern Peru to Patagonia. Less than 10% of the known electrical potential of the Andes had been used until the mid-1960s. The Brazilian Highlands has South American transportation systems are still deficient, with low kilometric densities. The region has about 1,700,000 km of highways and 100,000 km of railways, which are concentrated in the coastal strip, and the interior is still devoid of communication. Only two railroads are continental: the Transandina, which connects Buenos Aires, in Argentina to Valparaíso, in Chile, and the Brazil–Bolivia Railroad, which makes it the connection between the port of Santos in Brazil and the city of Santa Cruz de la Sierra, in Bolivia. In addition, there is the Pan-American Highway, which crosses the Andean countries from north to south, although some stretches are unfinished. Two areas of greater density occur in the railway sector: the platinum network, which develops around the Platine region, largely belonging to Argentina, with more than 45,000 km in length; And the Southeast Brazil network, which mainly serves the state of São Paulo, state of Rio de Janeiro and Minas Gerais. Brazil and Argentina also stand out in the road sector. In addition to the modern roads that extend through northern Argentina and south-east and south of Brazil, a vast road complex aims to link Brasília, the federal capital, to the South, Southeast, Northeast and Northern regions of Brazil. The Port of Callao is the main port of Peru. South America has one of the largest bays of navigable inland waterways in the world, represented mainly by the
South America is a continent in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. It may also be considered a subcontinent of the Americas, which is how it is viewed in Spanish and Portuguese-speaking regions of the Americas. The reference to South America instead of other regions (like Latin America or the Southern Cone) has increased in the last decades due to changing geopolitical dynamics (in particular, the rise of Brazil).
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summarize: In the 16th century, the term "hobyn" had the meaning of "small horse and pony". The term "hobby horse" was documented in a 1557 payment confirmation for a "Hobbyhorse" from Reading, England. The item, originally called a "Tourney Horse", was made of a wooden or basketwork frame with an artificial tail and head. It was designed for a child to mimic riding a real horse. By 1816 the derivative, "hobby", was introduced into the vocabulary of a number of English people. Over the course of subsequent centuries, the term came to be associated with recreation and leisure. In the 17th century, the term was used in a pejorative sense by suggesting that a hobby was a childish pursuit, however, in the 18th century with a more industrial society and more leisure time, hobbies took on greater respectability. A hobby is also called a pastime, derived from the use of hobbies to pass the time. A hobby became an activity that is practised regularly and usually with some worthwhile purpose. Hobbies are usually, but not always, practised primarily for interest and enjoyment, rather than financial reward. Hobbies were originally described as pursuits that others thought somewhat childish or trivial. However, as early as 1676 Sir Matthew Hale, in "Contemplations Moral and Divine", wrote "Almost every person hath some hobby horse or other wherein he prides himself." He was acknowledging that a "hobby horse" produces a legitimate sense of pride. By the mid 18th century there was a flourishing of hobbies as working people had more regular hours of work and greater leisure time. They spent more time to pursue interests that brought them satisfaction. However, there was concern that these working people might not use their leisure time in worthwhile pursuits. "The hope of weaning people away from bad habits by the provision of counter-attractions came to the fore in the 1830s, and has rarely waned since. Initially the bad habits were perceived to be of a sensual and physical nature, and the counter attractions, or perhaps more accurately alternatives, deliberately cultivated rationality and the intellect." The flourishing book and magazine trade of the day encouraged worthwhile hobbies and pursuits. The burgeoning manufacturing trade made materials used in hobbies cheap and was responsive to the changing interests of hobbyists. The English have been identified as enthusiastic hobbyists, as George Orwell observed. "[A]nother English characteristic which is so much a part of us that we barely notice it... is the addiction to hobbies and spare-time occupations, the privateness of English life. We are a nation of flower-lovers, but also a nation of stamp-collectors, pigeon-fanciers, amateur carpenters, coupon-snippers, darts-players, crossword-puzzle fans. All the culture that is most truly native centres round things which even when they are communal are not official—the pub, the football match, the back garden, the fireside and the 'nice cup of tea'." Deciding what to include in a list of hobbies provokes debate because it is difficult to decide which pleasurable pass-times can also be described as hobbies. During the 20th century the term hobby suggested activities, such as stamp collecting, embroidery, knitting, painting, woodwork, and photography. Typically the description did not include activities like listening to music, watching television, or reading. These latter activities bring pleasure, but lack the sense of achievement usually associated with a hobby. They are usually not structured, organised pursuits, as most hobbies are. The pleasure of a hobby is usually associated with making something of value or achieving something of value. "Such leisure is socially valorised precisely because it produces feelings of satisfaction with something that looks very much like work but that is done of its own sake." "Hobbies are a contradiction: they take work and turn it into leisure, and take leisure and turn it into work." Hobbies change with time. In the 21st century, the video game industry is a very large hobby involving millions of kids and adults in various forms of 'play'. Stamp collecting declined along with the importance of the postal system. Woodwork and knitting declined as hobbies, because manufactured goods provide cheap alternatives for handmade goods. Through the internet, an online community has become a hobby for many people; sharing advice, information and support, and in some cases, allowing a traditional hobby, such as collecting, to flourish and support trading in a new environment. Hobbyists are a part of a wider group of people engaged in leisure pursuits where the boundaries of each group overlap to some extent. The "Serious Leisure Perspective" groups hobbyists with amateurs and volunteers and identifies three broad groups of leisure activity with hobbies being found mainly in the Serious leisure category. "Casual leisure" is intrinsically rewarding, short-lived, pleasurable activity requiring little or no preparation. "Serious leisure" is the systematic pursuit of an amateur, hobbyist, or volunteer that is substantial, rewarding and results in a sense of accomplishment. Finally, "project-based leisure" is a short-term often a one-off project that is rewarding. The terms amateur and hobbyist are often used interchangeably. Stebbins has a framework which distinguishes the terms in a useful categorisation of leisure in which "casual leisure" is separated from "serious Leisure". He describes serious leisure as undertaken by "amateurs", "hobbyists" and "volunteers". "Amateurs" engage in pursuits that have a professional counterpart, such as playing an instrument or astronomy. Hobbyists engage in five broad types of activity: "collecting", "making and tinkering" (like embroidery and car restoration), "activity participation" (like fishing and singing), "sports and games", and "liberal-arts" hobbies (like languages, cuisine, literature). Volunteers commit to organisations where they work as guides, counsellors, gardeners and so on. The separation of the amateur from the hobbyist is because the amateur has the ethos of the professional practitioner as a guide to practice. An amateur clarinetist is conscious of the role and procedures of a professional clarinetist. A large proportion of hobbies are mainly solitary in nature. However, individual pursuit of a hobby often includes club memberships, organised sharing of products and regular communication between participants. For many hobbies there is an important role in being in touch with fellow hobbyists. Some hobbies are of communal nature, like choral singing and volunteering. People who engage in hobbies have an interest in and time to pursue them. Children have been an important group of hobbyists because they are enthusiastic for collecting, making and exploring, in addition to this they have the leisure time that allows them to pursue those hobbies. The growth in hobbies occurred during industrialisation which gave workers set time for leisure. During the Depression there was an increase in the participation in hobbies because the unemployed had the time and a desire to be purposefully occupied. Hobbies are often pursued with an increased interest by retired people because they have the time and seek the intellectual and physical stimulation a hobby provides. Hobbies are a diverse set of activities and it is difficult to categorize them in a logical manner. The following categorization of hobbies was developed by Stebbins. Collecting includes seeking, locating, acquiring, organizing, cataloging, displaying and storing. Collecting is appealing to many people due to their interest in a particular subject and a desire to categorise and make order out of complexity. Some collectors are generalists, accumulating items from countries of the world. Others focus on a subtopic within their area of interest, perhaps 19th century postage stamps, milk bottle labels from Sussex, or Mongolian harnesses and tack, Firearms (both modern and vintage). Collecting is an ancient hobby, with the list of coin collectors showing Caesar Augustus as one. Sometimes collectors have turned their hobby into a business, becoming commercial dealers that trade in the items being collected. An alternative to collecting physical objects is collecting records of events of a particular kind. Examples include train spotting, bird-watching, aircraft spotting, railfans, and any other form of systematic recording a particular phenomenon. The recording form can be written, photographic, online, etc. "Making" and "tinkering" includes working on self-motivated projects for fulfillment. These projects may be progressive, irregular tasks performed over a long period of time. Making and Tinkering hobbies include higher-end projects, such as building or restoring a car or building a computer from individual parts, like CPUs and SSDs. For computer savvy do-it-yourself hobbyists, CNC (Computer Numerical Control) machining may also popular. A CNC machine can be assembled and programmed to make different parts from wood or metal. Tinkering is 'dabbling' with the making process, often applied to the hobby of tinkering with car repairs, and various kinds of restoration: of furniture, antique cars, etc. It also applies to household tinkering: repairing a wall, laying a pathway, etc. Examples of Making and Tinkering hobbies include Scale modeling, model engineering, 3D printing, dressmaking, and cooking. Scale modeling is making a replica of a real-life object in a smaller scale and dates back to prehistoric times with small clay "dolls" and other children's toys that have been found near known populated areas. The Persians, Greeks, and Romans took the form to a greater depth during their years of domination of the Western World, using scale replicas of enemy fortifications, coastal defense lines, and other geographic fixtures to plan battles. At the turn of the Industrial Age and through the 1920s, some families could afford things such as electric trains, wind-up toys (typically boats or cars) and the increasingly valuable tin toy soldiers. Scale modeling as we know it today became popular shortly after World War II. Before 1946, children as well as adults were content in carving and shaping wooden replicas from block wood kits, often depicting enemy aircraft to help with identification in case of an invasion. With the advent of modern plastics, the amount of skill required to get the basic shape accurately shown for any given subject was lessened, making it easier for people of all ages to begin assembling replicas in varying scales. Superheroes, aeroplanes, boats, cars, tanks, artillery, and even figures of soldiers became quite popular subjects to build, paint and display. Although almost any subject can be found in almost any scale, there are common scales for such miniatures which remain constant today. Model engineering refers to building functioning machinery in metal, such as internal combustion motors and live steam models or locomotives. This is a demanding hobby that requires a multitude of large and expensive tools, such as lathes and mills. This hobby originated in the United Kingdom in the late 19th century, later spreading and flourishing in the mid-20th century. Due to the expense and space required, it is becoming rare. 3D Printing is a relatively new technology and already a major hobby as the cost of printers has fallen sharply. It is a good example of how hobbyists quickly engage with new technologies, communicate with one another and become producers related to their former hobby. 3D modeling is the process of making mathematical representations of three dimensional items and is an aspect of 3D printing. Dressmaking has been a major hobby up until the late 20th century, in order to make cheap clothes, but also as a creative design and craft challenge. It has been reduced by the low cost of manufactured clothes. Cooking is for some people an interest, a hobby, a challenge and a source of significant satisfaction. For many other people it is a job, a chore, a duty, like cleaning. In the early 21st century the importance of cooking as a hobby was demonstrated by the high popularity of competitive television cooking programs. Activity participation includes partaking in "non-competitive, rule-based pursuits." Outdoor pursuits are the group of activities which occur outdoors. These hobbies include gardening, hill walking, hiking, backpacking, cycling, canoeing, climbing, caving, fishing, hunting, target shooting (informal or formal), wildlife viewing (as birdwatching) and engaging in watersports and snowsports. One large subset of outdoor pursuits is gardening. Residential gardening most often takes place in or about one's own residence, in a space referred to as the garden. Although a garden typically is located on the land near a residence, it may also be located on a roof, in an atrium, on a balcony, in a windowbox, or on a patio or vivarium. Gardening also takes place in non-residential green areas, such as parks, public or semi-public gardens (botanical gardens or zoological gardens), amusement and theme parks, along transportation corridors, and around tourist attractions and hotels. In these situations, a staff of gardeners or groundskeepers maintains the gardens. Indoor gardening is concerned with growing houseplants within a residence or building, in a conservatory, or in a greenhouse. Indoor gardens are sometimes incorporated into air conditioning or heating systems. Water gardening is concerned with growing plants that have adapted to pools and ponds. Bog gardens are also considered a type of water garden. A simple water garden may consist solely of a tub containing the water and plant(s). Container gardening is concerned with growing plants in containers that are placed above the ground. Many hobbies involve performances by the hobbyist, such as singing, acting, juggling, magic, dancing, playing a musical instrument, martial arts, and other performing arts. Some hobbies may result in an end product. Examples of this would be woodworking, photography, moviemaking, jewelry making, software projects such as Photoshopping and home music or video production, making bracelets, artistic projects such as drawing, painting, writing..., Cosplay (design, creation, and wearing a costume based on an already existing creative property), creating models out of card stock or paper – called papercraft. Many of these fall under the category visual arts. Reading, books, ebooks, magazines, comics, or newspapers, along with browsing the internet is a common hobby, and one that can trace its origins back hundreds of years. A love of literature, later in life, may be sparked by an interest in reading children's literature as a child. Many of these fall under the category literary arts. Stebbins distinguishes an amateur sports person and a hobbyist by suggesting a hobbyist plays in less formal sports, or games that are rule bound and have no professional equivalent. While an amateur sports individual plays a sport with a professional equivalent, such as football or tennis. Amateur sport may range from informal play to highly competitive practice, such as deck tennis or long distance trekking. The Department for Culture, Media, and Support in England suggests that playing sports benefits physical and mental health. A positive relationship appeared between engaging in sports and improving overall health. During the 20th century there was extensive research into the important role that play has in human development. While most evident in childhood, play continues throughout life for many adults in the form of games, hobbies, and sport. Moreover, studies of ageing and society support the value of hobbies in healthy ageing. There have been many instances where hobbyists and amateurs have achieved significant discoveries and developments. These are a small sample. RC Cars HOBBY
A hobby is a regular activity done for enjoyment, typically during one's leisure time, not professionally and not for pay. Hobbies include collecting themed items and objects, engaging in creative and artistic pursuits, playing sports, or pursuing other amusements. Participation in hobbies encourages acquiring substantial skills and knowledge in that area. A list of hobbies changes with renewed interests and developing fashions, making it diverse and lengthy. Hobbies tend to follow trends in society, for example stamp collecting was popular during the nineteenth and twentieth centuries as postal systems were the main means of communication, while video games are more popular nowadays following technological advances. The advancing production and technology of the nineteenth century provided workers with more availability in leisure time to engage in hobbies. Because of this, the efforts of people investing in hobbies has increased with time.
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summarize: "Afri" was a Latin name used to refer to the inhabitants of then-known northern Africa to the west of the Nile river, and in its widest sense referred to all lands south of the Mediterranean (Ancient Libya). This name seems to have originally referred to a native Libyan tribe, an ancestor of modern Berbers; see Terence for discussion. The name had usually been connected with the Phoenician word "" meaning "dust", but a 1981 hypothesis has asserted that it stems from the Berber word "ifri" (plural "ifran") meaning "cave", in reference to cave dwellers. The same word may be found in the name of the Banu Ifran from Algeria and Tripolitania, a Berber tribe originally from Yafran (also known as "Ifrane") Africa is considered by most paleoanthropologists to be the oldest inhabited territory on Earth, with the human species originating from the continent. During the mid-20th century, anthropologists discovered many fossils and evidence of human occupation perhaps as early as 7 million years ago (BP=before present). Fossil remains of several species of early apelike humans thought to have evolved into modern man, such as "Australopithecus afarensis" (radiometrically dated to approximately 3.9–3.0 million years BP, "Paranthropus boisei" (c. 2.3–1.4 million years BP) and "Homo ergaster" (c. 1.9 million–600,000 years BP) have been discovered. After the At about 3300 BC, the historical record opens in Northern Africa with the rise of literacy in the Pharaonic civilization of Ancient Egypt. One of the world's earliest and longest-lasting civilizations, the Egyptian state continued, with varying levels of influence over other areas, until 343 BC. Egyptian influence reached deep into modern-day Libya and Nubia, and, according to Martin Bernal, as far north as Crete. An independent centre of civilization with trading links to Phoenicia was established by Phoenicians from Tyre on the north-west African coast at Carthage. European exploration Pre-colonial Africa possessed perhaps as many as 10,000 different states and polities characterized by many different sorts of political organization and rule. These included small family groups of hunter-gatherers such as the San people of southern Africa; larger, more structured groups such as the family clan groupings of the Bantu-speaking peoples of central, southern, and eastern Africa; heavily structured clan groups in the Horn of Africa; the large Sahelian kingdoms; and autonomous city-states and kingdoms such as those of the Akan; Edo, Yoruba, and Igbo people in West Africa; and the Swahili coastal trading Slavery had long been practiced in Africa. Between the 7th and 20th centuries, the Arab slave trade (also known as "slavery in the east") took 18 million slaves from Africa via trans-Saharan and Indian Ocean routes. Between the 15th and the 19th centuries, the Atlantic slave trade took an estimated 7–12 million slaves to the New World. In addition, more than 1 million Europeans were captured by Barbary pirates and sold as slaves in North Africa between the 16th and 19th centuries. In West Africa, the decline of the Atlantic slave trade in the 1820s caused dramatic economic shifts in local polities. The gradual decline of slave-trading, Imperial rule by Europeans would continue until after the conclusion of World War II, when almost all remaining colonial territories gradually obtained formal independence. Independence movements in Africa gained momentum following World War II, which left the major European powers weakened. In 1951, Libya, a former Italian colony, gained independence. In 1956, Tunisia and Morocco won their independence from France. Ghana followed suit the next year (March 1957), becoming the first of the sub-Saharan colonies to be granted independence. Most of the rest Today, Africa contains 54 sovereign countries, most of which have borders that were drawn during the era of European colonialism. Since colonialism, African states have frequently been hampered by instability, corruption, violence, and authoritarianism. The vast majority of African states are republics that operate under some form of the presidential system of rule. However, few of them have been able to sustain democratic governments on a permanent basis, and many have instead cycled through a series of coups, producing military dictatorships. Great instability was mainly the result Africa is the largest of the three great southward projections from the largest landmass of the Earth. Separated from Europe by the Mediterranean Sea, it is joined to Asia at its northeast extremity by the Isthmus of Suez (transected by the Suez Canal), wide. (Geopolitically, Egypt's Sinai Peninsula east of the Suez Canal is often considered part of Africa, as well.) The coastline is long, and the absence of deep indentations of the shore is illustrated by the fact that Europe, which covers only – about a third of the surface of Africa – has a coastline of. From the most northerly point, Ras ben Sakka in Tunisia (37°21' N), to the most southerly point, Cape Agulhas in South Africa (34°51'15" S), is a distance of approximately. Cape Verde, 17°33'22" W, the westernmost point, is a distance of approximately to Ras Hafun, 51°27'52" E, the most easterly projection that neighbours Cape Guardafui, the tip of the Horn of Africa. Africa's largest country is Algeria, and its smallest country is Seychelles, an archipelago off the east coast. The smallest nation on the continental mainland is The Gambia. The African Plate is a major tectonic plate straddling the equator as well as the prime meridian. It includes much of the continent of Africa, as well as oceanic crust which lies between the continent and various surrounding ocean ridges. Between and, the Somali Plate began rifting from the African Plate along the East African Rift. The climate of Africa ranges from tropical to subarctic on its highest peaks. Its northern half is primarily desert, or arid, while its central and southern areas contain both savanna plains and dense jungle Africa boasts perhaps the world's largest combination of density and "range of freedom" of wild animal populations and diversity, with wild populations of large carnivores (such as lions, hyenas, and cheetahs) and herbivores (such as buffalo, Africa has over 3,000 protected areas, with 198 marine protected areas, 50 biosphere reserves, and 80 wetlands reserves. Significant habitat destruction, increases in human population and poaching are reducing Africa's biological diversity and arable land. Human encroachment, civil unrest and the introduction of non-native species threaten biodiversity in Africa. This has been exacerbated by administrative problems, inadequate personnel and funding problems. Deforestation is affecting Africa at twice the The African Union (AU) is a 55-member federation consisting of all of Africa's states. The union was formed, with Addis Ababa, Ethiopia, as its headquarters, on 26 June 2001. The union was officially established on 9 July 2002 as a successor to the Organisation of African Unity (OAU). In July 2004, the African Union's Pan-African Parliament (PAP) was relocated to Midrand, in South Africa, but the African Commission on Human and Peoples' Rights remained in Addis Ababa. There is a policy in effect to decentralize the African Federation's institutions so that they are shared by all the states. The African Union, not to be confused with the AU Commission, is formed by the Constitutive Act of the African Union, which aims to transform the African Economic Community, a federated commonwealth, into a state under established international conventions. The African Union has a parliamentary government, Although it has abundant natural resources, Africa remains the world's poorest and least-developed continent, the result of a variety of causes that may include corrupt governments that have often committed serious human rights violations, failed central planning, high levels of illiteracy, lack of access to foreign capital, and frequent tribal and military conflict (ranging from guerrilla warfare to genocide). Its total nominal GDP remains behind that of the United States, China, Japan, Germany, the United Kingdom, India and France. According to the United Nations' Human Development Report in 2003, the bottom 24 ranked nations (151st to 175th) were all African. Poverty, illiteracy, malnutrition and inadequate water supply and sanitation, as well as poor health, affect a large proportion of the people who reside in the African continent. In August 2008, the World Bank announced revised global poverty estimates based on a new international poverty line of $1.25 per day (versus the previous measure of $1.00). 81% of the Sub-Saharan Africa population was living on less than $2.50 (PPP) per day in 2005, compared with 86% for India. Sub-Saharan Africa is the least successful region of the world in reducing poverty ($1.25 per day); some 50% of the population living in poverty in 1981 (200 million people), a figure that rose to 58% in 1996 before dropping to 50% in 2005 (380 million people). The average poor person in sub-Saharan Africa is estimated to live on only 70 cents per day, and was poorer in 2003 than in 1973, indicating increasing poverty in some areas. Some of it is attributed to unsuccessful economic liberalization programmes spearheaded by foreign companies and governments, but other studies have cited bad domestic government policies more than external factors. Africa is now at risk of being in debt once again, particularly in Sub-Saharan African countries. The last debt crisis in 2005 was resolved with help from the heavily indebted poor countries scheme (HIPC). The HIPC resulted in some positive and negative effects on the economy in Africa. About ten years after the 2005 debt crisis in Sub-Saharan Africa was resolved, Zambia fell back into dept. A small reason was due to the fall in copper prices in 2011, but the bigger reason was that a large amount of Africa's population has rapidly increased over the last 40 years, and consequently, it is relatively young. In some African states, more than half the population is under 25 years of age. The total number of people in Africa increased from 229 million in 1950 to 630 million in 1990. As of, the population of Africa is estimated at billion. Africa's total population surpassing other continents is fairly recent; African population surpassed Europe in the 1990s, while the Americas was overtaken sometime around the year 2000; Africa's rapid population growth is expected to overtake the only two nations currently larger than its population, at roughly the same time – India and China's 1.4 billion people each will swap ranking around the year 2022. This increase in number of babies born in Africa compared to the rest of the world is expected to reach approximately 37% in the year 2050, an increase of 21% since 1990 alone. Speakers of Bantu languages (part of the Niger–Congo family) are the majority in southern, central and southeast Africa. The Bantu-speaking peoples from the Sahel progressively expanded over most of Sub-Saharan Africa. But there are also several Nilotic groups in South Sudan and East Africa, the mixed Swahili people on the Swahili Coast, and a few remaining indigenous Khoisan ("San" or "Bushmen") and Pygmy peoples in southern and central Africa, respectively. Bantu-speaking Africans also predominate in Gabon and Equatorial Guinea, and are found in parts of southern Cameroon. In the Kalahari Desert of Southern Africa, the distinct people known as the Bushmen (also "San", closely related to, but distinct from "Hottentots") have long been present. The San are physically distinct from other Africans and are the indigenous people of southern Africa. Pygmies are the pre-Bantu indigenous peoples of central Africa. The peoples of West Africa primarily speak Niger–Congo languages, belonging mostly to its non-Bantu branches, though some Nilo-Saharan and Afro-Asiatic speaking groups are also found. The Niger–Congo-speaking Yoruba, Igbo, Fulani, Akan and Wolof ethnic groups are the largest and most influential. In the central Sahara, Mandinka or Mande groups are most significant. Chadic-speaking groups, including the Hausa, are found in more northerly parts of By most estimates, well over a thousand languages (UNESCO has estimated around two thousand) are spoken in Africa. Most are of African origin, though some are of European or Asian origin. Africa is the most multilingual continent in the world, and it is not rare for individuals to fluently speak not only multiple African languages, but one or more European ones as well. There are four major language families indigenous to Africa: Following the Some aspects of traditional African cultures have become less practised in recent years as a result of neglect and suppression by colonial and post-colonial regimes. For example, African customs were discouraged, and African languages were prohibited in mission schools. Leopold II of Belgium attempted to "civilize" Africans by discouraging polygamy and witchcraft. Obidoh Freeborn posits that colonialism is one element that has created the character of modern African art. According to authors Douglas Fraser and Herbert M. Cole, "The precipitous alterations in the power structure wrought by colonialism were quickly followed by drastic iconographic changes in the art." Fraser and Cole assert that, in Igboland, some art objects "lack the vigor and careful craftsmanship of the earlier art objects that served traditional functions. Author Chika Okeke-Agulu states that "the racist infrastructure of British imperial enterprise forced upon the political and cultural guardians of empire a denial and suppression of an emergent sovereign Africa and modernist art." Editors F. Abiola Irele and Simon Gikandi comment that the current identity of African literature had its genesis in the "traumatic encounter between Africa and Europe." On the other hand, Mhoze Chikowero believes that Africans deployed music, dance, spirituality, and other performative cultures to (re)asset themselves as active agents and indigenous intellectuals, to unmake their colonial marginalization and reshape their own destinies." There is now a resurgence in the attempts to rediscover and revalue African traditional cultures, under such movements as the African Renaissance, led by Thabo Mbeki, Afrocentrism, led by a group of scholars, including Molefi Asante, as well as the increasing recognition of traditional spiritualism through decriminalization of Vodou and other forms of spirituality. African art and architecture reflect the diversity of African cultures. The region's oldest known beads were made from "Nassarius" shells and worn as personal ornaments 72,000 years ago. The Great Pyramid of Egypt has long been a cultural focus of the Arab world, while remembrance of the rhythms of sub-Saharan Africa, in particular West Africa, was transmitted through the Atlantic slave trade to modern samba, blues, jazz, reggae, hip hop, and rock. The 1950s through the 1970s saw a conglomeration of these various styles with the popularization of Afrobeat Fifty-four African countries have football (soccer) teams in the Confederation of African Football. Egypt has won the African Cup seven times, and a record-making three times in a row. Cameroon, Nigeria, Senegal, Ghana, and Algeria have advanced to the knockout stage of recent FIFA World Cups. South Africa hosted the 2010 World Cup tournament, becoming the first African country to do so. Africans profess a wide variety of religious beliefs, and statistics on religious affiliation are difficult to come by since they are often a sensitive topic for governments with mixed religious populations. According to the World The countries in this table are categorized according to the scheme for geographic subregions used by the United Nations, and data included are per sources in cross-referenced articles. Where they differ, provisos are clearly indicated.
Africa is the world's second-largest and second-most populous continent, after Asia. At about 30.3 million km (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area and 20% of its land area. With billion people as of, it accounts for about 16% of the world's human population. Africa's average population is the youngest amongst all the continents; the median age in 2012 was 19.7, when the worldwide median age was 30.4. Despite a wide range of natural resources, the continent is the least wealthy per capita in large part due to the legacies of European colonization in Africa. Despite this low concentration of wealth, recent economic expansion and the large and young population make Africa an important economic market in the broader global context.
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summarize: It is likely that the term “functions of state” was used in a loose sense during the 1850s and 60s by those such as Rudolf Clausius, William Rankine, Peter Tait, William Thomson, and it is clear that by the 1870s the term had acquired a use of its own. In 1873, for example, Willard Gibbs, in his paper “Graphical Methods in the Thermodynamics of Fluids”, states: “The quantities "V", "B", "T", "U", and "S" are determined when the state of the body is given, and it may be permitted to call them "functions of the state of the body". A thermodynamic system is described by a number of thermodynamic parameters (e.g. temperature, volume, pressure) which are not necessarily independent. The number of parameters needed to describe the system is the dimension of the state space of the system (). For example, a monatomic gas having a fixed number of particles is a simple case of a two-dimensional system (). In this example, any system is uniquely specified by two parameters, such as pressure and volume, or perhaps pressure and temperature. These choices are equivalent. They are simply different coordinate systems in the two-dimensional thermodynamic state space. Given pressure and temperature, the volume is calculable from them. Likewise, given pressure and volume, the temperature is calculable from them. An analogous statement holds for higher-dimensional spaces, as described by the state postulate. Quite generally, a state function is of the form where denotes pressure, denotes temperature, denotes volume, and the ellipsis denotes other possible state variables like particle number and entropy. If the state space is two-dimensional as in the above example, one may visualize the state space as a three-dimensional graph (a surface in three-dimensional space). The labels of the axes are not unique, since there are more state variables than three in this case, and any two independent variables suffice to define the state. When a system changes state continuously, it traces out a "path" in the state space. The path can be specified by noting the values of the state parameters as the system traces out the path, perhaps as a function of time, or some other external variable. For example, we might have the pressure and the volume as functions of time from time to ; this will specify a path in our two-dimensional state space example. We can now form all sorts of functions of time which we may integrate over the path. For example, if we wish to calculate the work done by the system from time to time we calculate It is clear that in order to calculate the work W in the above integral, we will have to know the functions and at each time, over the entire path. A state function is a function of the parameters of the system which only depends upon the parameters' values at the endpoints of the path. For example, suppose we wish to calculate the work plus the integral of over the path. We would have: It can be seen that the integrand can be expressed as the exact differential of the function and that therefore, the integral can be expressed as the difference in the value of at the end points of the integration. The product is therefore a state function of the system. By way of notation, we will specify the use of to denote an exact differential. In other words, the integral of will be equal to. The symbol will be reserved for an inexact differential, which cannot be integrated without full knowledge of the path. For example, will be used to denote an infinitesimal increment of work. It is best to think of state functions as quantities or properties of a thermodynamic system, while non-state functions represent a process during which the state functions change. For example, the state function is proportional to the internal energy of an ideal gas, but the work is the amount of energy transferred as the system performs work. Internal energy is identifiable; it is a particular form of energy. Work is the amount of energy that has changed its form or location. The following are considered to be state functions in thermodynamics:
In thermodynamics, a state function or function of state or point function is a function defined for a system relating several "state variables" or "state quantities" that depends only on the current equilibrium state of the system, for example a gas, a liquid, a solid, crystal, or emulsion. State functions do not depend on the path by which the system arrived at its present state. A state function describes the equilibrium state of a system and thus also describes the type of system. For example, a state function could describe an atom or molecule in a gaseous, liquid, or solid form; a heterogeneous or homogeneous mixture; and the amounts of energy required to create such systems or change them into a different equilibrium state.
en
en
143
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summarize: The ordinary year in the previous Roman calendar consisted of 12 months, for a total of 355 days. In addition, a 27- or 28-day intercalary month, the Mensis Intercalaris, was sometimes inserted between February and March. This intercalary month was formed by inserting 22 or 23 days after the first 23 days of February; the last five days of February, which counted down toward the start of March, became the last five days of Intercalaris. The net effect was to add 22 or 23 days to the year, forming an intercalary Although the approximation of days for the tropical year had been known for a long time ancient solar calendars had used less precise periods, resulting in gradual misalignment of the calendar with the seasons. The octaeteris, a cycle of 8 lunar years popularised by Cleostratus (and also commonly attributed to Eudoxus) which was used in some early Greek calendars, notably in Athens, is 1.53 days longer than eight Julian years. The length of nineteen years in the cycle of Meton was 6,940 days, six hours longer than the mean Julian year. The mean Julian year was the basis of the 76-year cycle devised by Callippus (a student under Eudoxus) to improve the Metonic cycle. In Persia (Iran) after the reform in the Persian calendar by introduction of the Persian Zoroastrian (i. e. Young Avestan) calendar in 503 BC and afterwards, the first day of the year (1 Farvardin=Nowruz) slipped against the vernal equinox at the rate of approximately one day every four years. Likewise in the Egyptian calendar, a fixed year of 365 days was in use, drifting by one day Caesar's reform only applied to the Roman calendar. However, in the following decades many of the local civic and provincial calendars of the empire and neighbouring client kingdoms were aligned to the Julian calendar by transforming them into calendars with years of 365 days with an extra day intercalated every four years. The reformed calendars typically retained many features of the unreformed calendars. In many cases, the New Year was not on 1 January, the leap day was not on the bissextile day, the old month names were retained, the lengths of the reformed months did not match the lengths of Julian months, and, even if they did, their first days did not match the first day of the corresponding Julian month. Nevertheless, since The first step of the reform was to realign the start of the calendar year (1 January) to the tropical year by making 46 BC (708 AUC) 445 days long, compensating for the intercalations which had been missed during Caesar's pontificate. This year had already been extended from 355 to 378 days by the insertion of a regular intercalary month in February. When Caesar decreed the reform, probably shortly after his return from the African campaign in late Quintilis (July), The Julian months were formed by adding ten days to a regular pre-Julian Roman year of 355 days, creating a regular Julian year of 365 days. Two extra days were added to January, Sextilis (August) and December, and one extra day was added to April, June, September and November. February was not changed in ordinary years, and so continued to be the traditional 28 days. Thus, the ordinary (i.e., non-leap year) lengths of all of the months were set by the Julian calendar to the same values they still hold today. (See Sacrobosco's theory on month lengths (below) for stories purporting otherwise.) The Julian reform did not change the method used to account days of the month in the pre-Julian calendar, based on the Kalends, Nones and Ides, nor did it change the positions of these three dates within the months. Macrobius states that the extra days were added immediately before the last day of each month to avoid disturbing the position of the established religious ceremonies relative to the Nones and Ides of the month. However, since Roman dates after the The old intercalary month was abolished. The new leap day was dated as "ante diem bis sextum Kalendas Martias" ('the sixth doubled day before the Kalends of March'), usually abbreviated as "a.d. bis VI Kal. Mart."; hence it is called in English the bissextile day. The year in which it occurred was termed "annus bissextus", in English the bissextile year. There is debate about the exact position of the bissextile day in the early Julian calendar. The earliest direct evidence is a statement of the 2nd century jurist Celsus, who states The Julian reform set the lengths of the months to their modern values. However, a 13th-century scholar, Sacrobosco, proposed a different explanation for the lengths of Julian months which is still widely repeated but is certainly wrong. According to Sacrobosco, the month lengths for ordinary years in the Roman Republican calendar, from January to December, were: Sacrobosco then thought that Julius Caesar added one day to every month except February, a total of 11 more days to regular months, giving the ordinary Julian year of 365 days. A single leap day could now be added to this extra short February: He then said Augustus changed this, by taking one day from February to add it to Sextilis, and then modifying the alternation of the following months, to: so that the length of "Augustus" (August) would not be shorter than (and therefore The Julian calendar has two types of year: "normal" years of 365 days and "leap" years of 366 days. There is a simple cycle of three "normal" years followed by a leap year and this pattern repeats forever without exception. The Julian year is, therefore, on average 365.25 days long. Consequently, the Julian year drifts over time with respect to the tropical (solar) year (365.24217 days). Although Greek astronomers had known, at least since Hipparchus, a century before the Julian reform, that the tropical year was slightly shorter than 365.25 days, the calendar did not compensate for this difference. As a result, the calendar year gains about three days every four centuries compared to observed Although the new calendar was much simpler than the pre-Julian calendar, the pontifices initially added a leap day every three years, instead of every four. There are accounts of this in Solinus, Pliny, Ammianus, Suetonius, and Censorinus. Macrobius gives the following account of the introduction of the Julian calendar: So, according to Macrobius, Some people have had different ideas as to how the leap years went. The above scheme is that of Scaliger (1583) in the table below. He established that the Augustan reform was instituted in 8 BC. The table shows for each reconstruction the implied proleptic Julian date for the first day of Caesar's reformed calendar (Kal. Ian. AUC 709) and the first Julian date on which the Roman calendar date matches the Julian calendar after the completion of Augustus' reform. Alexander Jones says that the correct Julian calendar was in use in Egypt in 24 BC, implying that the first day of the reform in both Egypt and Rome,, was the Julian date 1 January if 45 BC was a leap year and 2 January if it was not. This necessitates fourteen leap days up to and including AD 8 if 45 BC was a leap year and thirteen if it was not. Pierre Brind'Amour argued that "only one day was intercalated between 1/1/45 and 1/1/40 (disregarding a momentary 'fiddling' in December of 41) to avoid the nundinum falling on Kal. Ian." By the systems of Scaliger, Ideler and Bünting, the leap years prior to the suspension happen to be BC years that are divisible by 3, just as, after leap year The Julian reform did not immediately cause the names of any months to be changed. The old intercalary month was abolished and replaced with a single intercalary day at the same point (i.e., five days before the end of February). January continued to be the first month of the year. The Romans later renamed months after Julius Caesar and Augustus, renaming Quintilis as "Iulius" (July) in 44 BC and Sextilis as "Augustus" (August) in 8 BC. Quintilis was renamed to honour Caesar because it was the month of his birth. According to a "senatus consultum" quoted by Macrobius, Sextilis was renamed to honour Augustus because several of the most significant events in his rise to power, culminating in the fall of Alexandria, occurred in that month. Other months were renamed by other emperors, but apparently none of the later changes survived their deaths. In AD 37, Caligula renamed September as "Germanicus" after his father; in AD 65, Nero renamed April as "Neroneus", May as "Claudius" and June as "Germanicus"; and in AD 84 Domitian renamed September as "Germanicus" and October as "Domitianus". Commodus was unique in renaming all twelve months after his own adopted names (January to December): "Amazonius", "Invictus", "Felix", "Pius", The principal method used by the Romans to identify a year for dating purposes was to name it after the two consuls who took office in it, the eponymous period in question being the consular year. Beginning in 153 BC, consuls began to take office on 1 January, thus synchronizing the commencement of the consular and calendar years. The calendar year has begun in January and ended in December since about 450 BC according to Ovid or since about 713 BC according to Macrobius and Plutarch (see Roman calendar). Julius Caesar did not change the beginning of either the consular year or the calendar year. In addition to consular years, the Romans sometimes used the regnal year of the emperor, and by the late 4th century documents were also being dated according to the 15-year cycle of the indiction. In 537, Justinian required that henceforth the date must include the name of the emperor and his regnal year, in addition to the indiction and the consul, while also allowing the use of local eras. In 309 and 310, and from time to time thereafter, no consuls were appointed. When this happened, the consular date was given a count of years since the last consul (so-called "post-consular" dating). After 541, only the reigning emperor held the consulate, typically for only one year in his reign, and so post-consular dating became the norm. Similar post-consular dates were also known in the west in the early 6th century. The system of consular dating, long obsolete, was formally abolished in the law code of Leo VI, issued in 888. Only rarely did the Romans number the year from the founding of the city (of Rome), "ab urbe condita" (AUC). This method was used by Roman historians to determine the number of years The Roman calendar began the year on 1 January, and this remained the start of the year after the Julian reform. However, even after local calendars were aligned to the Julian calendar, they started the new year on different dates. The Alexandrian calendar in Egypt started on 29 August (30 August after an Alexandrian leap year). Several local provincial calendars were aligned to start on the birthday of Augustus, 23 September. The indiction caused the Byzantine year, which used the Julian calendar, to begin on 1 September; this date is still used in the Eastern Orthodox Church for the beginning of the liturgical year. When the Julian calendar was adopted in AD 988 by Vladimir I of Kiev, the year was numbered Anno Mundi 6496, beginning on 1 March, six months after the start of the Byzantine Anno Mundi year with the same number. In 1492 (AM 7000), Ivan III, according to church tradition, realigned the start of the year to 1 September, so that AM 7000 only lasted for six months in Russia, from 1 March to 31 August 1492. During the Middle Ages 1 January retained the name "New Year's Day" (or an equivalent name) in all western European countries (affiliated with the Roman Catholic Church), since the medieval calendar continued to display the months from January to December (in The Julian calendar has been replaced as the civil calendar by the Gregorian calendar in all countries which officially used it apart from Greece, which now uses the Revised Julian calendar. Turkey switched (for fiscal purposes) on 16 February/1 March 1917. Russia changed on 1/14 February 1918. Greece made the change for civil purposes on 16 February/1 March 1923, but the national day (25 March), which was a religious holiday, was to remain on the old calendar. This provision became redundant on 10/23 March the following year when the calendar systems of church and state were unified. Most Christian denominations in the west and areas evangelised by western churches have made the change to Gregorian for their liturgical calendars to align with the civil calendar. A calendar similar to the Julian one, the Alexandrian calendar, is the basis for the Ethiopian calendar, which is still the civil calendar of Ethiopia. Egypt converted from the Alexandrian calendar to Gregorian on 1 Thaut 1592/11 September 1875. During the changeover between calendars and for some time afterwards, dual dating was used in documents and gave the date according to both systems. In contemporary as well as modern texts that describe events during the period of change, it is customary to clarify to which calendar a given date refers by using an O.S. or N.S. suffix (denoting Old Style, Julian or New Style, Gregorian). The Julian calendar was in general use in Europe and northern Africa until 1582, when Pope Gregory XIII promulgated the Gregorian calendar. Reform was required because too many leap days are added with respect to the astronomical seasons on the Julian scheme. On average, the astronomical solstices and the equinoxes advance by 10.8 minutes per year against the Julian year. As a result, the calculated date of Easter gradually moved out of alignment with the March equinox. While Hipparchus and presumably Sosigenes Although most Eastern Orthodox countries (most of them in eastern or southeastern Europe) had adopted the Gregorian calendar by 1924, their national churches had not. The "Revised Julian calendar" was endorsed by a synod in Constantinople in May 1923, consisting of a solar part which was and will be identical to the Gregorian calendar until the year 2800, and a lunar part which calculated Easter astronomically at Jerusalem. All Orthodox churches refused to accept the lunar part, so all Orthodox churches continue to celebrate Easter according to the Julian calendar, with the exception of the Finnish Orthodox Church, which uses the Gregorian "Paschalion". The solar part of the Revised Julian calendar was accepted by only some Orthodox churches. Those that did accept it, with hope for improved dialogue and negotiations with the western denominations, were the Ecumenical Patriarchate of Constantinople, the Patriarchates of Alexandria, Antioch, the Orthodox Churches of Greece, Cyprus, Romania, Poland (from 1924 to 2014; it is still permitted to use the Revised Julian calendar in parishes that want it), Bulgaria (in 1963), and the Orthodox Church in America (although some OCA parishes are permitted to use the Julian calendar). Thus these churches celebrate the Nativity on the same day that western Christians do, 25 December Gregorian until 2799. The Orthodox Churches of Jerusalem, Russia, Serbia, Montenegro, Poland (from 15 June 2014), North Macedonia, Georgia, Ukraine, and the Greek Old Calendarists and other groups continue to use the Julian calendar, thus they celebrate the Nativity on 25 December "Julian" (which is 7 January "Gregorian" until 2100). The Russian Orthodox Church has some parishes in the West which celebrate the Nativity on 25 December "Gregorian" until 2799. Parishes of the Orthodox Church in America Bulgarian Diocese, both before and after the 1976 transfer of that diocese from the Russian Orthodox Church Outside Russia to the Orthodox Church in America, were permitted to use this date. Some Old Calendarist groups which stand in opposition to the state churches of their homelands will use the Great Feast of the Theophany (6 January "Julian"/19 January "Gregorian") as a day for religious processions and the Great Blessing of Waters, to publicise their cause. Most branches of the Eastern Orthodox Church use the Julian calendar for calculating the date of Easter, upon which the timing of all the other moveable feasts depends. Some such churches have adopted the Revised Julian calendar for the observance of fixed feasts, while such Orthodox churches retain the Julian calendar for all purposes. The Oriental Orthodox Churches generally use the local calendar of their homelands. However, when calculating the Nativity Feast, most observe the Julian calendar. This was traditionally for the sake of unity throughout Christendom. In the west, some Oriental The Julian calendar is still used by
The Julian calendar, proposed by Julius Caesar in 708Ab urbe condita (AUC) (46 BC), was a reform of the Roman calendar. It took effect on, by edict. It was designed with the aid of Greek mathematicians and Greek astronomers such as Sosigenes of Alexandria.
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summarize: According to the Copenhagen criteria, membership of the European Union is open to any European country that is a stable, free-market liberal democracy that respects the rule of law and human rights. Furthermore, it has to be willing to accept all the obligations of membership, such as adopting all previously agreed law (the 170,000 pages of acquis communautaire) and switching to the euro. For a state to join the European Union, the prior approval of all current member states is required. In addition to enlargement by adding new countries, the EU can also expand by having territories of member states, which are outside the EU, integrate more closely (for example in respect to the dissolution of the Netherlands Antilles) or by a territory of a member state which had previously seceded and then rejoined (see withdrawal below). Each state has representation in the institutions of the European Union. Full membership gives the government of a member state a seat in the Council of the European Union and European Council. When decisions are not being taken by consensus, qualified majority voting (which requires majorities both of the number of states and of the population they represent, but a sufficient blocking minority can veto the proposal). The Presidency of the Council of the European Union rotates among each of the member states, allowing each state six months to help direct the agenda of the EU. Similarly, each state is assigned seats in Parliament according to their population (smaller countries receiving more seats per inhabitant than the larger ones). The members of the European Parliament have been elected by universal suffrage since 1979 (before that, they were seconded from national parliaments). The national governments appoint one member each to the European Commission, the European Court of Justice and the European Court of Auditors. Prospective Commissioners must be confirmed both by the President of the Commission and by the European Parliament; prospective justices must be confirmed by the existing members. Historically, larger member states were granted an extra Commissioner. However, as the body grew, this right has been removed and each state is represented equally. The six largest states are also granted an Advocates General in the Court of Justice. Finally, the Governing Council of the European Central Bank includes the governors of the national central banks (who may or may not be government appointed) of each euro area country. The larger states traditionally carry more weight in negotiations, however smaller states can be effective impartial mediators and citizens of smaller states are often appointed to sensitive top posts to avoid competition between the larger states. This, together with the disproportionate representation of the smaller states in terms of votes and seats in parliament, gives the smaller EU states a greater power of influence than is normally attributed to a state of their size. However most negotiations are still dominated by the larger states. This has traditionally been largely through the "Franco-German motor" but Franco-German influence has diminished slightly following the influx of new members in 2004 (see G6). While the member states are sovereign, the union partially follows a supranational system for those functions agreed by treaty to be shared. ("Competences not conferred upon the Union in the Treaties remain with the member states"). Previously limited to European Community matters, the practice, known as the 'community method', is currently used in many areas of policy. "Combined sovereignty" is delegated by each member to the institutions in return for representation within those institutions. This practice is often referred to as 'pooling of sovereignty'. Those institutions are then empowered to make laws and execute them at a European level. If a state fails to comply with the law of the European Union, it may be fined or have funds withdrawn. In contrast to other organisations, the EU's style of integration has "become a highly developed system for mutual interference in each other's domestic affairs". However, on defence and foreign policy issues (and, pre-Lisbon Treaty, police and judicial matters) less sovereignty is transferred, with issues being dealt with by unanimity and co-operation. Very early on in the history of the EU, the unique state of its establishment and pooling of sovereignty was emphasised by the Court of Justice: The question of whether EU law is superior to national law is subject to some debate. The treaties do not give a judgement on the matter but court judgements have established EU's law superiority over national law and it is affirmed in a declaration attached to the Treaty of Lisbon (the European Constitution would have fully enshrined this). Some national legal systems also explicitly accept the Court of Justice's interpretation, such as France and Italy, however in Poland it does not override the national constitution, which it does in Germany. The exact areas where the member states have given legislative competence to the EU are as follows. Every area not mentioned remains with member states. In EU terminology, the term 'competence' means 'authority or responsibility to act'. The table below shows which aspects of governance are exclusively for collective action (through the Commission) and which are shared to a greater or lesser extent. If an aspect is not listed in the table below, then it remains the exclusive competence of the member state. Perhaps the best known example is taxation, which remains a matter of national sovereignty. As a result of the European sovereign debt crisis, some eurozone states were given a bailout from their fellow members via the European Financial Stability Facility and European Financial Stability Mechanism (replaced by the European Stability Mechanism from 2013), but this came with conditions. As a result of the Greek government-debt crisis, Greece accepted a large austerity plan including privatisations and a sell off of state assets in exchange for their bailout. To ensure that Greece complied with the conditions set by the European troika (ECB, IMF, Commission), a 'large-scale technical assistance' from the European Commission and other member states was deployed to Greek government ministries. Some, including the President of the Euro Group Jean-Claude Juncker, stated that "the sovereignty of Greece will be massively limited." The situation of the bailed out countries (Greece, Portugal and Ireland) has been described as being a ward or protectorate of the EU with some such as the Netherlands calling for a formalisation of the situation. EU integration is not always symmetrical, with some states proceeding with integration ahead of hold-outs. This comes in two forms; a faster integrated core where some states forge ahead with a new project, and opt-outs where a few states are excused from normal integration. The notion of multi-speed integration is anathema to some, including President Juncker, who see it as divisive to the European project and others, such as the less-integrated states, who feel they would be left behind. It is however supported by others, such as President Macron, to move forward in integration faster. There are several different forms closer integration both within and outside the EU's normal framework. The main mechanism is enhanced cooperation where nine or more states can use EU structures progress in a field that not all states are willing to partake in. One example of this is the European Public Prosecutor. A similar mechanism is Permanent Structured Cooperation in Defence, where the majority of EU states work in a flexible manner on defence cooperation. Other projects, such as the European Fiscal Compact, operate between EU members but as a separate intergovernmental treaty outside of the official EU structures. A number of states are less integrated into the EU than others. In most cases this is because those states have gained an opt-out from a certain policy area. The most notable is the opt-out from the Economic and Monetary Union, the adoption of the euro as sole legal currency. Most states outside the Eurozone are obliged to adopt the euro when they are ready, but Denmark (and formerly the United Kingdom) has obtained the right to retain their own independent currency. Ireland does not participate in the Schengen Agreement. Denmark has an opt out from the Common Security and Defence Policy; Denmark and Ireland have an opt-out on police and justice matters and Poland has an opt out from the Charter of Fundamental Rights. Entry to the EU is limited to liberal democracies and Freedom House ranks all EU states as being totally free electoral democracies. All but 4 are ranked at the top 1.0 rating. However, the exact political system of a state is not limited, with each state having its own system based on its historical evolution. More than half of member states—15 out of 27—are parliamentary republics, while six states are constitutional monarchies, meaning they have a monarch although political powers are exercised by elected politicians. Most republics and all the monarchies operate a parliamentary system whereby the head of state (president or monarch) has a largely ceremonial role with reserve powers. That means most power is in the hands of what is called in most of those countries the prime minister, who is accountable to the national parliament. Of the remaining republics, five operate a semi-presidential system, where competencies are shared between the president and prime minister, while one republic operates a presidential system, where the president is head of state and government. Parliamentary structure in member states varies: there are 15 unicameral national parliaments and 12 bicameral parliaments. The prime minister and government are usually directly accountable to the directly elected lower house and require its support to stay in office—the exceptions being Cyprus and France with their presidential systems. Upper houses are composed differently in different member states: it can be directly elected like the Polish senate; indirectly elected, for example, by regional legislatures like the Federal Council of Austria; or unelected, but representing certain interest groups like the National Council of Slovenia. All elections in member states use some form of proportional representation. The most common type of proportional representation is the party-list system. There are also differences in the level of self-governance for the sub-regions of a member state. Most states, especially the smaller ones, are unitary states; meaning all major political power is concentrated at the national level. 9 states allocate power to more local levels of government. Austria, Belgium and Germany are full federations, meaning their regions have constitutional autonomies. Denmark, Finland, France and the Netherlands are federacies, meaning some regions have autonomy but most do not. Spain and Italy have system of devolution where regions have autonomy, but the national government retains the right to revoke it. \ States such as France have a number of overseas territories, retained from their former empires. The Lisbon Treaty made the first provision of a member state to leave. The procedure for a state to leave is outlined in which also makes clear that "Any Member State may decide to withdraw from the Union in accordance with its own constitutional requirements". Although it calls for a negotiated withdrawal between the seceding state and the rest of the EU, if no agreement is reached two years after the seceding state notifying of its intention to leave, it would cease to be subject to the treaties anyway (thus ensuring a right to unilateral withdrawal). There is no formal limit to how much time a member state can take between adopting a policy of withdrawal, and actually triggering Article 50. In a non-binding referendum in June 2016—the result of which the government promised to implement—the United Kingdom voted to withdraw from the EU. The UK government triggered Article 50 on 29 March 2017. After an extended period of negotiation and internal political debate the United Kingdom eventually withdrew from the EU on 31st January 2020 concluding the first phase of the Brexit process. Prior to 2016, no member state had ever voted to withdraw. However, French Algeria, Greenland and Saint-Barthélemy did cease being part of the EU (or its predecessor) in 1962, 1985, and 2012, respectively, due to status changes. The situation of Greenland being outside the EU while still subject to an EU member state had been discussed as a template for the pro-EU regions of the UK remaining within the EU or its single market. Beyond the formal withdrawal of a member state, there are a number of independence movements such as Catalonia or Flanders which could result in a similar situation to Greenland. Were a territory of a member state to secede but wish to remain in the EU, some scholars claim it would need to reapply to join as if it were a new country applying from scratch. However, other studies claim internal enlargement is legally viable if, in case of a member state dissolution or secession, the resulting states are "all" considered successor states. There is also a European Citizens' Initiative that aims at guaranteeing the continuity of rights and obligations of the European citizens belonging to a new state arising from the democratic secession of a European Union member state. There is no provision to expel a member state, but provides for the suspension of certain rights. Introduced in the Treaty of Amsterdam, Article 7 outlines that if a member persistently breaches the EU's founding principles (liberty, democracy, human rights and so forth, outlined in ) then the European Council can vote to suspend any rights of membership, such as voting and representation. Identifying the breach requires unanimity (excluding the state concerned), but sanctions require only a qualified majority. The state in question would still be bound by the obligations treaties and the Council acting by majority may alter or lift such sanctions. The Treaty of Nice included a preventive mechanism whereby the Council, acting by majority, may identify a potential breach and make recommendations to the state to rectify it before action is taken against it as outlined above. However, the treaties do not provide any mechanism to expel a member state outright. There are a number of countries with strong links with the EU, similar to elements of membership. Following Norway's decision not to join the EU, it remained one of the members of the European Economic Area (EEA) via the European Free Trade Association (EFTA), which also includes Iceland, Liechtenstein, and Switzerland. Switzerland rejected membership of the EEA. The EEA links these countries into the EU's market, extending the four freedoms to these states. In return, they pay a membership fee and have to adopt most areas of EU law (which they do not have direct impact in shaping). The democratic repercussions of this have been described as "fax democracy" (waiting for new laws to be faxed in from Brussels rather than being involved in drafting them). A different example is Bosnia and Herzegovina, which has been under international supervision. The High Representative for Bosnia and Herzegovina is an international administrator who has wide-ranging powers over Bosnia and Herzegovina to ensure the peace agreement is respected. The High Representative is also the EU's representative, and is in practice appointed by the EU. In this role, and since a major ambition of Bosnia and Herzegovina is to join the EU, the country has become a "de facto" protectorate of the EU. The EU appointed representative has the power to impose legislation and dismiss elected officials and civil servants, meaning the EU has greater direct control over Bosnia and Herzegovina than its own states. Indeed, the state's flag resembles the EU's flag according to some observers. In the same manner as Bosnia and Herzegovina, Kosovo is under heavy EU influence, particularly after the "de facto" transfer from UN to EU authority. In theory Kosovo is supervised by EU missions, with justice and policing personal training and helping to build up the state institutions. However the EU mission does enjoy certain executive powers over the state and has a responsibility to maintain stability and order. Like Bosnia, Kosovo has been termed an "EU protectorate". However, there is also the largely defunct term of "associate member". It has occasionally been applied to states that have signed an association agreement with the EU. Associate membership is not a formal classification and does not entitle the state to any of the representation of free movement rights that full membership allows. The term is almost unheard of in the modern context and was primarily used in the earlier days of the EU with countries such as Greece and Turkey. Turkey's association agreement was the 1963 Ankara Agreement, implying that Turkey became an associate member that year. Present association agreements include the Stabilisation and Association Agreements with the western Balkans; these states are no longer termed "associate members". The United Kingdom's future relationship and agreements with the rest of the European Union is yet to be officially decided, with a current deadline of 31 December 2020, the date for new post Brexit relations to be reached. For the rest of 2020 (following The UK's departure on 31 January 2020), the United Kingdom will remain in the EU Customs Union and single market, however the British government have insisted that they do not wish to remain in either after 2020, and hope for a more distant future relationship. There are a number of overseas member state territories which are legally part of the EU, but have certain exemptions based on their remoteness. These "outermost regions" have partial application of EU law and in some cases are outside of Schengen or the EU VAT area—however they are legally within the EU. They all use the euro as their currency. Acronyms have been used as a shorthand way of grouping countries by their date of accession. Additionally, other acronyms have been used to refer to countries which have limited access to the EU labour market.
The European Union (EU) consists of 27 member states. Each member state is party to the founding treaties of the union and thereby shares in the privileges and obligations of membership. Unlike members of most international organisations, the member states of the EU have agreed by treaty to shared sovereignty through the institutions of the European Union in some (but by no means all) aspects of government. Member states must agree unanimously for the EU to adopt some policies; for others, collective decision making is by qualified majority voting. Subsidiarity, meaning that decisions are taking collectively if and only if they cannot realistically be taken individually, is a founding principle of the EU.
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summarize: It combines the major idea of "The Little Shop of Horrors" by Roger Corman with the adventures of the literary character Nick Carter. It was directed by Oldřich Lipský with Rudolf Hrušínský, Michal Dočolomanský, and Miloš Kopecký in the leading roles. The bizarre gadgets and animated sequences were created by Jan Švankmajer, a famous Czech artist. It is the turn from the nineteenth to the twentieth century. The Prague police commissar Ledvina asked the famous New York detective Nick Carter to travel to Prague, for assistance to solve the strange case of a missing dog. Mysterious murder cases happen during the investigations, done by the malicious botanist Baron von Kratzmar and his carnivorous plant Adela. Von Kratzmar kidnapped his victims, bound them and whenever he played a gramophone with the melody "Schlafe, mein Prinzchen" (a lullaby by Bernhard Flies but previously associated with Wolfgang Amadeus Mozart) it is the time for Adela to awaken and eat her victims for dinner. Baron von Kratzmar considered himself a misjudged genius and wanted to take revenge on one of his former professors. He called himself "the Gardener" a notorious criminal, who Nick Carter thought had died in the swamps years ago. With the help of bizarre inventions, Ledvina and Carter succeed in catching von Kratzmar and delivering him to the legal authorities. The film was also selected as the Czechoslovakian entry for the Best Foreign Language Film at the 51st Academy Awards, but was not accepted as a nominee.
Dinner for Adele () is a 1977 Czechoslovak comedy detective film directed by Oldřich Lipský. Alternative titles were Adele Hasn't Had Her Dinner Yet, Nick Carter in Prague and Adela Has Not Had Supper Yet.
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en
40
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summarize: The Latin "sol" for "Sun" is believed to originate in the Proto-Indo-European language, as a continuation of the heteroclitic "*Sehul- / *Sh-en-", and thus cognate to other solar deities in other Indo-European Languages: Germanic "Sol", Sanskrit "Surya", Greek "Helios", Lithuanian "Saulė". Also compare Latin "sol" to Etruscan "usil". Today, "sol" (or variations of it, such as Italian "sole" or French "soleil") is still the main word for "sun" in Romance languages. According to Roman sources, the worship of Sol was introduced by Titus Tatius shortly after the foundation of Rome. In Virgil he is the grandfather of Latinus, the son of Sol's daughter Circe who lived not far from Rome at Monte Circeo. A shrine to Sol stood on the banks of the Numicius, near many important shrines of early Latin religion. In Rome Sol had an "old" temple in the Circus Maximus according to Tacitus (56–117 CE), and this temple remained important in the first three centuries CE. There was also an old shrine for Sol on the Quirinal, where an annual sacrifice was offered to Sol Indiges on August 9 to commemorate Caesar's victory at Pharsala (48 BCE). The Roman ritual calendars or fasti also mention a feast for Sol Indiges on December 11, and a sacrifice for Sol and Luna on August 28. Traditionally, scholars have considered "Sol Indiges" to represent an earlier, more agrarian form in which the Roman god Sol was worshipped, and considered him to be very different from the late Roman Sol Invictus, whom they believed was a predominantly Syrian deity. Neither the epithet "indiges" (which fell out of use sometime after Caesar) nor the epithet "invictus" are used with any consistency however, making it impossible to differentiate between the two. "Sol Invictus" (English translated as "Unconquered Sun") was long thought to have been a foreign state-supported sun god introduced from either Emesa or Palmyra in Syria by the emperor Aurelian in 274 and overshadowing other Eastern cults in importance, until the abolition of classical Roman religion under Theodosius I. However the evidence for this is meager at best, and the notion that Aurelian introduced a new cult of the sun ignores the abundant evidence on coins, in images, in inscriptions, and in other sources for a strong presence of the sun god in Rome throughout the imperial period. Tertullian (died 220 CE) writes that the Circus Maximus was dedicated primarily to Sol. During the reign of Aurelian, a new college of pontiffs for Sol was established. There is some debate over the significance of the date December 21 for the cult of Sol. According to a single, late source, the Romans held a festival on December 21 of "Dies Natalis Invicti", "the birthday of the unconquered one." Most scholars assume Sol Invictus was meant, although our source for this festival does not state so explicitly. December 25 was commonly indicated as the date of the winter solstice, with the first detectable lengthening of daylight hours. There were also festivals on other days in December, including the 11th (mentioned above), as well as August. Gordon points out that none of these other festivals are linked to astronomical events. When the festival on December 25 was instituted is not clear, which makes it hard to assess what impact (if any) it had on the establishment of Christmas. Throughout the 4th century the cult of Sol continued to be maintained by high-ranking pontiffs, including the renowned Vettius Agorius Praetextatus. The Greek assimilation of Apollo and Helios was already established in Rome by the end of the republic. Various Roman philosophers speculated on the nature of the sun, without arriving at any consensus. A typical example is Nigidius, a scholar of the 1st century BCE. His works have not survived, but writing five centuries later, Macrobius reports that Nigidius argued that Sol was to be identified with Janus and that he had a counterpart, Jana, who was Luna. As such, they were to be regarded as the highest of the gods, receiving their sacrifices before all the others. Such speculations appear to have been restricted to an erudite elite and had no impact on the well-attested cult of Sol as independent deity: No ancient source aside from Macrobius mentions the equation of Sol with Janus.
Sol is the personification of the Sun and a god in ancient Roman religion. It was long thought that Rome actually had two different, consecutive sun gods: The first, Sol Indiges, was thought to have been unimportant, disappearing altogether at an early period. Only in the late Roman Empire, scholars argued, did solar cult re-appear with the arrival in Rome of the Syrian Sol Invictus, perhaps under the influence of the Mithraic mysteries. Recent publications have challenged the notion of two different sun gods in Rome, pointing to the abundant evidence for the continuity of the cult of Sol, and the lack of any clear differentiation – either in name or depiction – between the "early" and "late" Roman sun god.
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summarize: The euro is managed and administered by the Frankfurt-based European Central Bank (ECB) and the Eurosystem (composed of the central banks of the eurozone countries). As an independent central bank, the ECB has sole authority to set monetary policy. The Eurosystem participates in the printing, minting and distribution of notes and coins in all member states, and the operation of the eurozone payment systems. Since 1 January 2002, the national central banks (NCBs) and the ECB have issued euro banknotes on a joint basis. Eurosystem NCBs are required to accept euro banknotes put into circulation by other Eurosystem members and these banknotes are not repatriated. The ECB issues 8% of the total value of The euro is divided into 100 cents (also referred to as "euro cents", especially when distinguishing them from other currencies, and referred to as such on the common side of all cent coins). In Community legislative acts the plural forms of "euro" and "cent" are spelled without the "s", notwithstanding normal English usage. Otherwise, normal English plurals are used, with many local variations such as "centime" in France. All circulating coins have a "common side" showing the denomination or value, and a map in the background. Due to the linguistic plurality in the European Union, the Latin alphabet version Capital within the EU may be transferred in any amount from one state to another. All intra-Union transfers in euro are treated as domestic transactions and bear the corresponding domestic transfer costs. This includes all member states of the A special euro currency sign (€) was designed after a public survey had narrowed the original ten proposals down to two. The European Commission then chose the design created by the Belgian Alain Billiet. Of The euro was established by the provisions in the 1992 Maastricht Treaty. To participate in the currency, member states are meant to meet strict criteria, such as a budget deficit of less than 3% of their GDP, a debt ratio of less than 60% of GDP (both of which were ultimately widely flouted after introduction), low inflation, and interest rates close to the EU average. In the Maastricht Treaty, the United Kingdom and Denmark were granted exemptions per their request from moving to the stage of monetary union which resulted in the introduction of the Following the U.S. financial crisis in 2008, fears of a sovereign debt crisis developed in 2009 among investors concerning some European states, with the situation becoming particularly tense in early 2010. Greece was most acutely affected, but fellow Eurozone members Cyprus, Ireland, Italy, Portugal, and Spain were also significantly affected. All these countries utilized EU funds except Italy, which is a major donor to the EFSF. To be included in the eurozone, countries had to fulfil certain convergence criteria, but the meaningfulness of such criteria was diminished by the fact it was not enforced with the same level of strictness among countries. According to the Economist Intelligence Unit in 2011, "[I]f the [euro area] is treated as a single entity, its [economic and fiscal] position looks no The euro is the sole currency of 19 EU member states: Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia, and Spain. These countries constitute the "eurozone", some 343 million people in total. With all but one (Denmark) of the remaining EU members obliged to join when economic conditions permit, together with future members of the EU, the enlargement of the eurozone is set to continue. Outside the EU, the euro Since its introduction, the euro has been the second most widely held international reserve currency after the U.S. dollar. The share of the euro as a reserve currency increased from 18% in 1999 to 27% in 2008. Over this period, the share held in U.S. dollar fell from 71% to 64% and that held in RMB fell from 6.4% to 3.3%. The euro inherited and built on the status of the Deutsche Mark as the second most important reserve currency. The euro remains underweight as a reserve currency in advanced economies while overweight in emerging and developing economies: according Outside the eurozone, a total of 22 countries and territories that do not belong to the EU have currencies that are directly pegged to the euro including 14 countries in mainland Africa (CFA franc), two African island countries (Comorian franc and Cape Verdean escudo), three French Pacific territories (CFP franc) and three Balkan countries, Bosnia and Herzegovina (Bosnia and Herzegovina convertible mark), Bulgaria (Bulgarian lev) and North Macedonia (Macedonian denar). On 28 July 2009, São Tomé and Príncipe signed an agreement with Portugal which will eventually tie its currency to the euro. Additionally, the Moroccan dirham is tied to a basket of currencies, including the euro and the US dollar, with the euro given the highest weighting. With the exception of Bosnia, Bulgaria, North Macedonia (which had pegged their currencies In economics, an optimum currency area, or region (OCA or OCR), is a geographical region in which it would maximise economic efficiency to have the entire region share a single currency. There are two models, both proposed by Robert Mundell: the stationary expectations model and the international risk sharing model. Mundell himself advocates the international risk sharing model and thus concludes The most obvious benefit of adopting a single currency is to remove the cost of exchanging currency, theoretically allowing businesses and individuals to consummate previously unprofitable trades. For consumers, banks in the eurozone must charge the same for intra-member cross-border transactions as purely domestic transactions for electronic payments (e.g., credit cards, Another effect of the common European currency is that differences in prices—in particular in price levels—should decrease because of the law of one price. Differences in prices can trigger arbitrage, i.e., Before the introduction of the euro, some countries had successfully contained inflation, which was then seen as a major economic problem, by establishing largely independent central banks. One such bank was the Bundesbank in Germany; the European Central Bank was modelled on the Bundesbank. The euro has come under criticism due to its regulation, lack of flexibility and rigidity towards sharing member States on issues such as nominal interest rates. Many national and corporate bonds denominated in euro are significantly more liquid and have lower interest rates than was historically the case when denominated in national currencies. While increased liquidity may lower the nominal interest rate on the bond, denominating the bond in a currency with low levels of inflation arguably plays a much larger role. A credible commitment to low levels of inflation and a stable debt reduces the risk that the value of the debt will be eroded by higher levels of inflation or default in the future, allowing debt to be issued at a The ECB targets interest rates rather than exchange rates and in general does not intervene on the foreign exchange rate markets. This is because of the implications of the Mundell–Fleming model, which implies a central bank cannot (without The euro is the second-most widely held reserve currency after the U.S. dollar. After its introduction on 4 January 1999 its exchange rate against the other major currencies fell reaching its lowest exchange rates in 2000 (3 May vs Pound sterling, 25 October vs the U.S. dollar, 26 October vs Japanese yen). Afterwards it regained and its exchange rate reached Besides the economic motivations to the introduction of the euro, its creation was also partly justified as a way to foster a closer sense of joint identity between European citizens. Statements about this goal where for instance made by Wim The formal titles of the currency are "euro" for the major unit and "cent" for the minor (one-hundredth) unit and for official use in most eurozone languages; according to the ECB, all languages should use the same spelling for the nominative singular. This may contradict normal rules for word formation in some languages, e.g., those in which there is no "eu" diphthong. Bulgaria has negotiated an exception; "euro" in the Bulgarian Cyrillic alphabet is spelled as eвро ("evro") and not eуро ("euro") in all official documents. In the Greek script the term ευρώ (evró) is used; the Greek "cent" coins are denominated in λεπτό/ά (leptó/á). Official practice for English-language EU legislation is to use the words euro and cent as both singular and plural, although the European Commission's Directorate-General for Translation states that the plural forms "euros" and "cents" should be used in English.
The euro (sign: €; code: EUR) is the official currency of 19 of the member states of the European Union. This group of states is known as the eurozone or euro area, and counts about 343 million citizens. The euro, which is divided into 100 cents, is the second-largest and second-most traded currency in the foreign exchange market after the United States dollar.
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summarize: Petr, a Czech teenager, begins working as a trainee in theft prevention at a grocery store. He is criticized by his employer for being too conspicuous and then, when he suspects a man of stealing, he is too nervous to stop and confront the man so he just follows the man around and then returns home, where his father admonishes him because the shop manager had come looking for him. His father peppers him with questions about how he acted and why he did not do anything to stop the man. Petr likes Pavla, who is dating Mara. They go for a swim together and then lay on the grass, where they are yelled at by Čenda and Zdeněk, two apprentice bricklayers. Later at a party Čenda sees them together and repeatedly argues with Petr. He becomes upset when the master mason notices them fighting and blames Petr for making him look bad in front of the boss, then asks to borrow money. Petr lends him the money and Čenda buys more drinks to work up the courage to tell a girl in blue that he likes her, but the girl in blue has already begun to dance with someone else. Petr dances with Pavla but is unfamiliar with the popular moves. The next day Petr delivers two painting prints to the shop but one of them falls and breaks the glass and frame. He takes the print with him on a date with Pavla, who agrees to try to meet him again the next day. The next day at work Petr sees the thief he chased before and notifies his boss, but his boss shakes the man's hand and takes him into the back room. Confused, Petr watches a woman steal several items by hiding them in her bag and then leaving the store but he does not stop her. Petr gets in trouble again over the incident and once again faces a barrage of questions from his father about his behavior and why he failed to act. His father suspects that it was a retaliatory act for something that had gone wrong at the shop but Petr refuses to explain his actions. His father laments the fact that he invested in a violin and an accordion that remained unused while Petr bought a guitar that is unable to earn him any money. As Petr's father is yelling at him, Čenda knocks on the door. Petr's parents insist that Čenda come inside and sit down. Čenda returns the money that Petr lent him and Petr's mother offers him a piece of cake. When they learn that Čenda is an apprentice bricklayer, Petr's father makes Čenda show Petr his hands so that his son can see what hardworking hands look like. Zdeněk reminds Čenda that they must leave. Čenda attempts to stay because he finds the family fight interesting but when he is asked by Petr's father what is so interesting he backs away in fear. Petr's father continues with the argument, attempting to explain his perspective on what is important. "Černý Petr" was filmed in 1963 and holds a 1963 copyright notice but it did not premiere on screen until April 17, 1964. "Černý Petr" won the Golden Leopard at the 1964 Locarno International Film Festival.
Black Peter (original Czech title: "Černý Petr", known also as "Peter and Paula") is a 1964 film directed by Miloš Forman. It won the Golden Leopard award at the Locarno International Film Festival.
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summarize: In January 1781, before Georg Ohm's work, Henry Cavendish experimented with Leyden jars and glass tubes of varying diameter and length filled with salt solution. He measured the current by noting how strong a shock he felt as he completed the circuit with his body. Cavendish wrote that the "velocity" (current) varied directly as the "degree of electrification" (voltage). He did not communicate his results to other scientists at the time, and his results were unknown until Maxwell published them in 1879. Francis Ronalds delineated “intensity” (voltage) and “quantity” (current) for the dry pile—a high voltage source—in 1814 using a gold-leaf electrometer. He found for a dry pile that the relationship between the two parameters was not proportional under certain meteorological conditions. Ohm did his work on resistance in the years 1825 and 1826, and published his results in 1827 as the book "Die galvanische Kette, mathematisch bearbeitet" ("The galvanic circuit investigated mathematically"). He drew considerable inspiration from Fourier's work on heat conduction in the theoretical explanation of his work. For experiments, he initially used voltaic piles, but later used a thermocouple as this provided a more stable voltage source in terms of internal resistance and constant voltage. He used a galvanometer to measure current, and knew that the voltage between the thermocouple terminals was proportional to the junction temperature. He then added test wires of varying length, diameter, and material to complete the circuit. He found that his data could be modeled through the equation where "x" was the reading from the galvanometer, "l" was the length of the test conductor, "a" depended on the thermocouple junction temperature, and "b" was a constant of the entire setup. From this, Ohm determined his law of proportionality and published his results. In modern notation we would write, where formula_5 is the open-circuit emf of the thermocouple, formula_6 is the internal resistance of the thermocouple and formula_7 is the resistance of the test wire. In terms of the length of the wire this becomes, where formula_9 is the resistance of the test wire per unit length. Thus, Ohm's coefficients are, Ohm's law was probably the most important of the early quantitative descriptions of the physics of electricity. We consider it almost obvious today. When Ohm first published his work, this was not the case; critics reacted to his treatment of the subject with hostility. They called his work a "web of naked fancies" and the German Minister of Education proclaimed that "a professor who preached such heresies was unworthy to teach science." The prevailing scientific philosophy in Germany at the time asserted that experiments need not be performed to develop an understanding of nature because nature is so well ordered, and that scientific truths may be deduced through reasoning alone. Also, Ohm's brother Martin, a mathematician, was battling the German educational system. These factors hindered the acceptance of Ohm's work, and his work did not become widely accepted until the 1840s. However, Ohm received recognition for his contributions to science well before he died. In the 1850s, Ohm's law was known as such and was widely considered proved, and alternatives, such as "Barlow's law", were discredited, in terms of real applications to telegraph system design, as discussed by Samuel F. B. Morse in 1855. The electron was discovered in 1897 by J. J. Thomson, and it was quickly realized that it is the particle (charge carrier) that carries electric currents in electric circuits. In 1900 the first (classical) model of electrical conduction, the Drude model, was proposed by Paul Drude, which finally gave a scientific explanation for Ohm's law. In this model, a solid conductor consists of a stationary lattice of atoms (ions), with conduction electrons moving randomly in it. A voltage across a conductor causes an electric field, which accelerates the electrons in the direction of the electric field, causing a drift of electrons which is the electric current. However the electrons collide with and scatter off of the atoms, which randomizes their motion, thus converting the kinetic energy added to the electron by the field to heat (thermal energy). Using statistical distributions, it can be shown that the average drift velocity of the electrons, and thus the current, is proportional to the electric field, and thus the voltage, over a wide range of voltages. The development of quantum mechanics in the 1920s modified this picture somewhat, but in modern theories the average drift velocity of electrons can still be shown to be proportional to the electric field, thus deriving Ohm's law. In 1927 Arnold Sommerfeld applied the quantum Fermi-Dirac distribution of electron energies to the Drude model, resulting in the free electron model. A year later, Felix Bloch showed that electrons move in waves (Bloch waves) through a solid crystal lattice, so scattering off the lattice atoms as postulated in the Drude model is not a major process; the electrons scatter off impurity atoms and defects in the material. The final successor, the modern quantum band theory of solids, showed that the electrons in a solid cannot take on any energy as assumed in the Drude model but are restricted to energy bands, with gaps between them of energies that electrons are forbidden to have. The size of the band gap is a characteristic of a particular substance which has a great deal to do with its electrical resistivity, explaining why some substances are electrical conductors, some semiconductors, and some insulators. While the old term for electrical conductance, the mho (the inverse of the resistance unit ohm), is still used, a new name, the siemens, was adopted in 1971, honoring Ernst Werner von Siemens. The siemens is preferred in formal papers. In the 1920s, it was discovered that the current through a practical resistor actually has statistical fluctuations, which depend on temperature, even when voltage and resistance are exactly constant; this fluctuation, now known as Johnson–Nyquist noise, is due to the discrete nature of charge. This thermal effect implies that measurements of current and voltage that are taken over sufficiently short periods of time will yield ratios of V/I that fluctuate from the value of R implied by the time average or ensemble average of the measured current; Ohm's law remains correct for the average current, in the case of ordinary resistive materials. Ohm's work long preceded Maxwell's equations and any understanding of frequency-dependent effects in AC circuits. Modern developments in electromagnetic theory and circuit theory do not contradict Ohm's law when they are evaluated within the appropriate limits. Ohm's law is an empirical law, a generalization from many experiments that have shown that current is approximately proportional to electric field for most materials. It is less fundamental than Maxwell's equations and is not always obeyed. Any given material will break down under a strong-enough electric field, and some materials of interest in electrical engineering are "non-ohmic" under weak fields. Ohm's law has been observed on a wide range of length scales. In the early 20th century, it was thought that Ohm's law would fail at the atomic scale, but experiments have not borne out this expectation. As of 2012, researchers have demonstrated that Ohm's law works for silicon wires as small as four atoms wide and one atom high. The dependence of the current density on the applied electric field is essentially quantum mechanical in nature; (see Classical and quantum conductivity.) A qualitative description leading to Ohm's law can be based upon classical mechanics using the Drude model developed by Paul Drude in 1900. The Drude model treats electrons (or other charge carriers) like pinballs bouncing among the ions that make up the structure of the material. Electrons will be accelerated in the opposite direction to the electric field by the average electric field at their location. With each collision, though, the electron is deflected in a random direction with a velocity that is much larger than the velocity gained by the electric field. The net result is that electrons take a zigzag path due to the collisions, but generally drift in a direction opposing the electric field. The drift velocity then determines the electric current density and its relationship to E and is independent of the collisions. Drude calculated the average drift velocity from p = −"eEτ" where p is the average momentum, −"e" is the charge of the electron and τ is the average time between the collisions. Since both the momentum and the current density are proportional to the drift velocity, the current density becomes proportional to the applied electric field; this leads to Ohm's law. A hydraulic analogy is sometimes used to describe Ohm's law. Water pressure, measured by pascals (or PSI), is the analog of voltage because establishing a water pressure difference between two points along a (horizontal) pipe causes water to flow. Water flow rate, as in liters per second, is the analog of current, as in coulombs per second. Finally, flow restrictors—such as apertures placed in pipes between points where the water pressure is measured—are the analog of resistors. We say that the rate of water flow through an aperture restrictor is proportional to the difference in water pressure across the restrictor. Similarly, the rate of flow of electrical charge, that is, the electric current, through an electrical resistor is proportional to the difference in voltage measured across the resistor. Flow and pressure variables can be calculated in fluid flow network with the use of the hydraulic ohm analogy. The method can be applied to both steady and transient flow situations. In the linear laminar flow region, Poiseuille's law describes the hydraulic resistance of a pipe, but in the turbulent flow region the pressure–flow relations become nonlinear. The hydraulic analogy to Ohm's law has been used, for example, to approximate blood flow through the circulatory system. In circuit analysis, three equivalent expressions of Ohm's law are used interchangeably: Each equation is quoted by some sources as the defining relationship of Ohm's law, or all three are quoted, or derived from a proportional form, or even just the two that do not correspond to Ohm's original statement may sometimes be given. The interchangeability of the equation may be represented by a triangle, where "V" (voltage) is placed on the top section, the "I" (current) is placed to the left section, and the "R" (resistance) is placed to the right. The line that divides the left and right sections indicates multiplication, and the divider between the top and bottom sections indicates division (hence the division bar). Resistors are circuit elements that impede the passage of electric charge in agreement with Ohm's law, and are designed to have a specific resistance value "R". In a schematic diagram the resistor is shown as a zig-zag symbol. An element (resistor or conductor) that behaves according to Ohm's law over some operating range is referred to as an "ohmic device" (or an "ohmic resistor") because Ohm's law and a single value for the resistance suffice to describe the behavior of the device over that range. Ohm's law holds for circuits containing only resistive elements (no capacitances or inductances) for all forms of driving voltage or current, regardless of whether the driving voltage or current is constant (DC) or time-varying such as AC. At any instant of time Ohm's law is valid for such circuits. Resistors which are in "series" or in "parallel" may be grouped together into a single "equivalent resistance" in order to apply Ohm's law in analyzing the circuit. When reactive elements such as capacitors, inductors, or transmission lines are involved in a circuit to which AC or time-varying voltage or current is applied, the relationship between voltage and current becomes the solution to a differential equation, so Ohm's law (as defined above) does not directly apply since that form contains only resistances having value "R", not complex impedances which may contain capacitance ("C") or inductance ("L"). Equations for time-invariant AC circuits take the same form as Ohm's law. However, the variables are generalized to complex numbers and the current and voltage waveforms are complex exponentials. In this approach, a voltage or current waveform takes the form "Ae", where "t" is time, "s" is a complex parameter, and "A" is a complex scalar. In any linear time-invariant system, all of the currents and voltages can be expressed with the same "s" parameter as the input to the system, allowing the time-varying complex exponential term to be canceled out and the system described algebraically in terms of the complex scalars in the current and voltage waveforms. The complex generalization of resistance is impedance, usually denoted "Z"; it can be shown that for an inductor, and for a capacitor, We can now write, where V and I are the complex scalars in the voltage and current respectively and Z is the complex impedance. This form of Ohm's law, with "Z" taking the place of "R", generalizes the simpler form. When "Z" is complex, only the real part is responsible for dissipating heat. In the general AC circuit, "Z" varies strongly with the frequency parameter "s", and so also will the relationship between voltage and current. For the common case of a steady sinusoid, the "s" parameter is taken to be formula_15, corresponding to a complex sinusoid formula_16. The real parts of such complex current and voltage waveforms describe the actual sinusoidal currents and voltages in a circuit, which can be in different phases due to the different complex scalars. Ohm's law is one of the basic equations used in the analysis of electrical circuits. It applies to both metal conductors and circuit components (resistors) specifically made for this behaviour. Both are ubiquitous in electrical engineering. Materials and components that obey Ohm's law are described as "ohmic" which means they produce the same value for resistance ("R" = "V"/"I") regardless of the value of "V" or "I" which is applied and whether the applied voltage or current is DC (direct current) of either positive or negative polarity or AC (alternating current). In a true ohmic device, the same value of resistance will be calculated from "R" = "V"/"I" regardless of the value of the applied voltage "V". That is, the ratio of "V"/"I" is constant, and when current is plotted as a function of voltage the curve is "linear" (a straight line). If voltage is forced to some value "V", then that voltage "V" divided by measured current "I" will equal "R". Or if the current is forced to some value "I", then the measured voltage "V" divided by that current "I" is also "R". Since the plot of "I" versus "V" is a straight line, then it is also true that for any set of two different voltages "V" and "V" applied across a given device of resistance "R", producing currents "I" = "V"/"R" and "I" = "V"/"R", that the ratio ("V" − "V")/("I" − "I") is also a constant equal to "R". The operator "delta" (Δ) is used to represent a difference in a quantity, so we can write Δ"V" = "V" − "V" and Δ"I" = "I" − "I". Summarizing, for any truly ohmic device having resistance "R", "V"/"I" = Δ"V"/Δ"I" = "R" for any applied voltage or current or for the difference between any set of applied voltages or currents. There are, however, components of electrical circuits which do not obey Ohm's law; that is, their relationship between current and voltage (their "I"–"V" curve) is "nonlinear" (or non-ohmic). An example is the p–n junction diode (curve at right). As seen in the figure, the current does not increase linearly with applied voltage for a diode. One can determine a value of current ("I") for a given value of applied voltage ("V") from the curve, but not from Ohm's law, since the value of "resistance" is not constant as a function of applied voltage. Further, the current only increases significantly if the applied voltage is positive, not negative. The ratio "V"/"I" for some point along the nonlinear curve is sometimes called the "static", or "chordal", or DC, resistance, but as seen in the figure the value of total "V" over total "I" varies depending on the particular point along the nonlinear curve which is chosen. This means the "DC resistance" V/I at some point on the curve is not the same as what would be determined by applying an AC signal having peak amplitude Δ"V" volts or Δ"I" amps centered at that same point along the curve and measuring Δ"V"/Δ"I". However, in some diode applications, the AC signal applied to the device is small and it is possible to analyze the circuit in terms of the "dynamic", "small-signal", or "incremental" resistance, defined as the one over the slope of the "V"–"I" curve at the average value (DC operating point) of the voltage (that is, one over the derivative of current with respect to voltage). For sufficiently small signals, the dynamic resistance allows the Ohm's law small signal resistance to be calculated as approximately one over the slope of a line drawn tangentially to the "V"–"I" curve at the DC operating point. Ohm's law has sometimes been stated as, "for a conductor in a given state, the electromotive force is proportional to the current produced." That is, that the resistance, the ratio of the applied electromotive force (or voltage) to the current, "does not vary with the current strength." The qualifier "in a given state" is usually interpreted as meaning "at a constant temperature," since the resistivity of materials is usually temperature dependent. Because the conduction of current is related to Joule heating of the conducting body, according to Joule's first law, the temperature of a conducting body may change when it carries a current. The dependence of resistance on temperature therefore makes resistance depend upon the current in a typical experimental setup, making the law in this form difficult to directly verify. Maxwell and others worked out several methods to test the law experimentally in 1876, controlling for heating effects. Ohm's principle predicts the flow of electrical charge (i.e. current) in electrical conductors when subjected to the influence of voltage differences; Jean-Baptiste-Joseph Fourier's principle predicts the flow of heat in heat conductors when subjected to the influence of temperature differences. The same equation describes both phenomena, the equation's variables taking on different meanings in the two cases. Specifically, solving a heat conduction (Fourier) problem with "temperature" (the driving "force") and "flux of heat" (the rate of flow of the driven "quantity", i.e. heat energy) variables also solves an analogous electrical conduction (Ohm) problem having "electric potential" (the driving "force") and "electric current" (the rate of flow of the driven "quantity", i.e. charge) variables. The basis of Fourier's work was his clear conception and definition of thermal conductivity. He assumed that, all else being the same, the flux of heat is strictly proportional to the gradient of temperature. Although undoubtedly true for small temperature gradients, strictly proportional behavior will be lost when real materials (e.g. ones having a thermal conductivity that is a function of temperature) are subjected to large temperature gradients. A similar assumption is made in the statement of Ohm's law: other things being alike, the strength of the current at each point is proportional to the gradient of electric potential. The accuracy of the assumption that flow is proportional to the gradient is more readily tested, using modern measurement methods, for the electrical case than for the heat case. Ohm's law, in the form above, is an extremely useful equation in the field of electrical/electronic engineering because it describes how voltage, current and resistance are interrelated on a "macroscopic" level, that is, commonly, as circuit elements in an electrical circuit. Physicists who study the electrical properties of matter at the microscopic level use a closely related and more general vector equation, sometimes also referred to as Ohm's law, having variables that are closely related to the V, I, and R scalar variables of Ohm's law, but which are each functions of position within the conductor. Physicists often use this continuum form of Ohm's Law: where "E" is the electric field vector with units of volts per meter (analogous to "V" of Ohm's law which has units of volts), "J" is the current density vector with units of amperes per unit area (analogous to "I" of Ohm's law which has units of amperes), and "ρ" (Greek "rho") is the resistivity with units of ohm·meters (analogous to "R" of Ohm's law which has units of ohms). The above equation is sometimes written as J = formula_18E where "σ" (Greek "sigma") is the conductivity which is the reciprocal of ρ. The voltage between two points is defined as: with formula_20 the element of path along the integration of electric field vector E. If the applied E field is uniform and oriented along the length of the conductor as shown in the figure, then defining the voltage V in the usual convention of being opposite in direction to the field (see figure), and with the understanding that the voltage V is measured differentially across the length of the conductor allowing us to drop the Δ symbol, the above vector equation reduces to the scalar equation: Since the E field is uniform in the direction of wire length, for a conductor having uniformly consistent resistivity ρ, the current density J will also be uniform in any cross-sectional area and oriented in the direction of wire length, so we may write: Substituting the above 2 results (for "E" and "J" respectively) into the continuum form shown at the beginning of this section: The electrical resistance of a uniform conductor is given in terms of resistivity by: where "l" is the length of the conductor in SI units of meters, "a" is the cross-sectional area (for a round wire "a" = "πr" if "r" is radius) in units of meters squared, and ρ is the resistivity in units of ohm·meters. After substitution of "R" from the above equation into the equation preceding it, the continuum form of Ohm's law for a uniform field (and uniform current density) oriented along the length of the conductor reduces to the more familiar form: A perfect crystal lattice, with low enough thermal motion and no deviations from periodic structure, would have no resistivity, but a real metal has crystallographic defects, impurities, multiple isotopes, and thermal motion of the atoms. Electrons scatter from all of these, resulting in resistance to their flow. The more complex generalized forms of Ohm's law are important to condensed matter physics, which studies the properties of matter and, in particular, its electronic structure. In broad terms, they fall under the topic of constitutive equations and the theory of transport coefficients. If an external B-field is present and the conductor is not at rest but moving at velocity v, then an extra term must be added to account for the current induced by the Lorentz force on the charge carriers. In the rest frame of the moving conductor this term drops out because v= 0. There is no contradiction because the electric field in the rest frame differs from the E-field in the lab frame: E′ = E + v×B. Electric and magnetic fields are relative, see Lorentz transformation. If the current J is alternating because the applied voltage or E-field varies in time, then reactance must be added to resistance to account for self-inductance, see electrical impedance. The reactance may be strong if the frequency is high or the conductor is coiled. In a conductive fluid, such as a plasma, there is a similar effect. Consider a fluid moving with the velocity formula_27 in a magnetic field formula_28. The relative motion induces an electric field formula_29 which exerts electric force on the charged particles giving rise to an electric current formula_30. The equation of motion for the electron gas, with a number density formula_31, is written as where formula_33, formula_34 and formula_35 are the charge, mass and velocity of the electrons, respectively. Also, formula_36 is the frequency of collisions of the electrons with ions which have a velocity field formula_37. Since, the electron has a very small mass compared with that of ions, we can ignore the left hand side of the above equation to write where we have used the definition of the current density, and also put formula_39 which is the electrical conductivity. This equation can also be equivalently written as where formula_41 is the electrical resistivity. It is also common to write formula_42 instead of formula_43 which can be confusing since it is the same notation used for the magnetic diffusivity defined as formula_44.
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship:
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summarize: Aging and eccentric Emperor Rudolf II, who is obsessed with finding the Golem, refuses to hear out ambassadors and falls into destructive fits. Later he welcomes Magister Edward Kelley at Prague Castle and shows him his alchemist laboratory. All the alchemists are either charlatans or fools. Rudolf wants alchemist Scotta to make him an elixir of youth and pressures him into performing a magic ritual at night. While performing the ritual, they accidentally stumble upon the Golem. However the Golem can't be awaken without a little ball called shem. Meanwhile a baker Matěj is confronted with angry mob which demands bread rolls but cannot receive them, because the bread rolls are baked only for the emperor. When the corrupt head of the bakery leaves the building, Matěj distributes the emperor's bread rolls to the poor and is imprisoned in the dungeons for this deed. Kelley reveals his homunculus Sirael, whom the Emperor wishes to teach everything of our world, including love. Rudolf does not know that Sirael is a regular country girl, Kateřina, acting after coercion by Kelley. Kateřina and Matěj communicate through vents between Kelley's room and the dungeons and fall in love through conversation, although they cannot see each other. Alchemist Scotta concocts an elixir of youth for Rudolf (actually a mix of strong alcoholic drinks and morphium). Meanwhile, Matěj escapes the dungeons. Rudolf drinks Scotta's concoction and falls asleep. Matěj ends up in the emperor's rooms. Servants of the Emperor find the fugitive Matěj, who bears a remarkable likeness to the Emperor in his young days, hiding in the bath and, believing the rejuvenation has worked, they hold him for the emperor and dress him accordingly. After waking up, Rudolf sees Matěj and mistakes him for his younger self in the mirror. Elated by his supposed new vigor, Rudolf and his old loyal servant ride alone in a carriage to the countryside to remind themselves of the sins of their misspent youth. The emperor's mistress Countess Strada also believes the rejuvenation worked and drinks up the remnants of the concoction. She embarrasses Matěj by her advances and then falls asleep. The horrified and confused Matěj puts her on top of a two-story bed. Matěj decides that he has to act as Rudolf because it is his best chance to find Kateřina. Matěj as the emperor dismisses Rudolf's astrologer, minimises the extravagant expenses and deals with all the waiting ambassadors. He attempts to rule fairly, all the while searching for Kateřina. He finds a helper in Scotta, who knows his elixir could not have worked and therefore knows Matěj is not the real emperor. Meanwhile, intrigue abounds among the emperor's councillors and Kelley. They want to overthrow Rudolf and get power for themselves. They all want to utilise the Golem and chase after the shem, which is eventually found by Matěj. Kelley then pressures Kateřina into killing the emperor, but Matěj reveals to her that he's not Rudolf. Matěj's identity is also revealed to the councillors. They all try to capture him and Kateřina, while also fighting among themselves. Kelley is killed and Matěj is captured. Court Astrologer gets a shem from Matěj and awakes the Golem. Lang kills the astrologer and Russworm kills Lang. Then Russworm is killed by the Golem, who only obeys the person who put the shem in its head. The Emperor returns when the Golem is destroying the palace. Eventually, with the help of the townspeople, Matěj succeeds in stopping the Golem and removing the shem. Rudolf is reinstated, after Matěj convinces him to give the Golem to the people rather than use it for his own means. The Golem is installed in the bakery and its power is used to make more bread for everyone. Jan Werich and Jiří Voskovec were trying to make the film based on their play "Golem" in the 1930s. That film eventually became Le Golem directed by Julien Duvivier, who significantly re-wrote the screenplay and changed it into a horror film. Werich returned back to this theme in 1950s and co-wrote a screenplay with Jiří Brdečka. It was originally directed by Jiří Krejčík, but after disputes with the Werich, Krejčík was replaced by Martin Frič. The whole film was shot in Barrandov Studios. It was the third Czechoslovak full-length color film after "Warriors of Faith" and "Temno". It was shot on Eastmancolor and Agfacolor material. Costumes were based on designs by Jiří Trnka. "The Emperor and the Golem" had a premiere on 4 January 1952 as a two-part film, 155 minutes long. A 112-minute-long one-part international version was prepared, with most propaganda flavoured scenes cut out (e.g., songs). It was successfully distributed in many countries, including Italy, West Germany, East Germany, Sweden, USA, UK, Finland, France, Belgium or Argentina.
The Emperor and the Golem () is a two-part Czechoslovak historical fantasy comedy film produced in 1951. The film is set during the reign of Rudolf II, Holy Roman Emperor and was filmed in color (not common for Czechoslovak films in that period), because of the international release. It is one of the best known films of Jan Werich, who's performing a dual role of Emperor Rudolf and baker Matěj.
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summarize: There are multiple useful ways to define voltage, including the standard definition mentioned at the start of this page. There are also other useful definitions of work per charge (see this section). Voltage is defined so that negatively charged objects are pulled towards higher voltages, while positively charged objects are pulled towards lower voltages. Therefore, the conventional current in a wire or resistor always flows from higher voltage to lower voltage. Historically, voltage has been referred to using terms like "tension" and "pressure". Even today, the term "tension" is still used, for example within the phrase "high tension" (HT) which is commonly used in thermionic valve (vacuum tube) based electronics. The voltage increase from some point formula_1 to some point formula_2 is given by In this case, the voltage increase from point A to point B is equal to the work done per unit charge, against the electric field, to move the charge from A to B without causing any acceleration. Mathematically, this is expressed as the line integral of the electric field along that path. Under this definition, the voltage difference between two points is not uniquely defined when there are time-varying magnetic fields since the electric force is not a conservative force in such cases. If this definition of voltage is used, any circuit where there are time-varying magnetic fields, such as circuits containing inductors, will not have a well-defined voltage between nodes in the circuit. However, if magnetic fields are suitably contained to each component, then the electric field is conservative in the region exterior to the components, and voltages are well-defined in that region. In this case, the voltage across an inductor, viewed externally, turns out to be formula_4 despite the fact that, internally, the electric field in the coil is zero (assuming it is a perfect conductor). Using the above definition, the electric potential is not defined whenever magnetic fields change with time. In physics, it's sometimes useful to generalize the electric potential by only considering the conservative part of the electric field. This is done by the following decomposition used in electrodynamics: formula_5 where formula_6 is the magnetic vector potential. The above decomposition is justified by Helmholtz's theorem. In this case, the voltage increase from formula_1 to formula_2 is given by formula_9 where formula_10 is the rotational electric field due to time-varying magnetic fields. In this case, the voltage between points is always uniquely defined. In circuit analysis and electrical engineering, the voltage across an inductor is not considered to be zero or undefined, as the standard definition would suggest. This is because electrical engineers use a lumped element model to represent and analyze circuits. When using a lumped element model, it is assumed that there are no magnetic fields in the region surrounding the circuit and that the effects of these are contained in 'lumped elements', which are idealized and self-contained circuit elements used to model physical components. If the assumption of negligible leaked fields is too inaccurate, their effects can be modelled by parasitic components. In the case of a physical inductor though, the ideal lumped representation is often accurate. This is because the leaked fields of the inductor are generally negligible, especially if the inductor is a toroid. If leaked fields are negligible, we find that formula_11 is path-independent, and there is a well-defined voltage across the inductor's terminals. This is the reason that measurements with a voltmeter across an inductor are often reasonably independent of the placement of the test leads. The volt (symbol: ) is the derived unit for electric potential, electric potential difference, and electromotive force. The volt is named in honour of the Italian physicist Alessandro Volta (1745–1827), who invented the voltaic pile, possibly the first chemical battery. A simple analogy for an electric circuit is water flowing in a closed circuit of pipework, driven by a mechanical pump. This can be called a "water circuit". Potential difference between two points corresponds to the pressure difference between two points. If the pump creates a pressure difference between two points, then water flowing from one point to the other will be able to do work, such as driving a turbine. Similarly, work can be done by an electric current driven by the potential difference provided by a battery. For example, the voltage provided by a sufficiently-charged automobile battery can "push" a large current through the windings of an automobile's starter motor. If the pump isn't working, it produces no pressure difference, and the turbine will not rotate. Likewise, if the automobile's battery is very weak or "dead" (or "flat"), then it will not turn the starter motor. The hydraulic analogy is a useful way of understanding many electrical concepts. In such a system, the work done to move water is equal to the pressure multiplied by the volume of water moved. Similarly, in an electrical circuit, the work done to move electrons or other charge-carriers is equal to "electrical pressure" multiplied by the quantity of electrical charges moved. In relation to "flow", the larger the "pressure difference" between two points (potential difference or water pressure difference), the greater the flow between them (electric current or water flow). (See "electric power".) Specifying a voltage measurement requires explicit or implicit specification of the points across which the voltage is measured. When using a voltmeter to measure potential difference, one electrical lead of the voltmeter must be connected to the first point, one to the second point. A common use of the term "voltage" is in describing the voltage dropped across an electrical device (such as a resistor). The voltage drop across the device can be understood as the difference between measurements at each terminal of the device with respect to a common reference point (or ground). The voltage drop is the difference between the two readings. Two points in an electric circuit that are connected by an ideal conductor without resistance and not within a changing magnetic field have a voltage of zero. Any two points with the same potential may be connected by a conductor and no current will flow between them. The voltage between "A" and "C" is the sum of the voltage between "A" and "B" and the voltage between "B" and "C". The various voltages in a circuit can be computed using Kirchhoff's circuit laws. When talking about alternating current (AC) there is a difference between instantaneous voltage and average voltage. Instantaneous voltages can be added for direct current (DC) and AC, but average voltages can be meaningfully added only when they apply to signals that all have the same frequency and phase. Instruments for measuring voltages include the voltmeter, the potentiometer, and the oscilloscope. Analog voltmeters, such as moving-coil instruments, work by measuring the current through a fixed resistor, which, according to Ohm's Law, is proportional to the voltage across the resistor. The potentiometer works by balancing the unknown voltage against a known voltage in a bridge circuit. The cathode-ray oscilloscope works by amplifying the voltage and using it to deflect an electron beam from a straight path, so that the deflection of the beam is proportional to the voltage. A common voltage for flashlight batteries is 1.5 volts (DC). A common voltage for automobile batteries is 12 volts (DC). Common voltages supplied by power companies to consumers are 110 to 120 volts (AC) and 220 to 240 volts (AC). The voltage in electric power transmission lines used to distribute electricity from power stations can be several hundred times greater than consumer voltages, typically 110 to 1200 kV (AC). The voltage used in overhead lines to power railway locomotives is between 12 kV and 50 kV (AC) or between 0.75 kV and 3 kV (DC). Inside a conductive material, the energy of an electron is affected not only by the average electric potential, but also by the specific thermal and atomic environment that it is in. When a voltmeter is connected between two different types of metal, it measures not the electrostatic potential difference, but instead something else that is affected by thermodynamics. The quantity measured by a voltmeter is the negative of the difference of the electrochemical potential of electrons (Fermi level) divided by the electron charge and commonly referred to as the voltage difference, while the pure unadjusted electrostatic potential (not measurable with a voltmeter) is sometimes called Galvani potential. The terms "voltage" and "electric potential" are ambiguous in that, in practice, they can refer to "either" of these in different contexts. The term "electromotive force" was first used by Volta in a letter to Giovanni Aldini in 1798, and first appeared in a published paper in 1801 in "Annales de chimie et de physique". Volta meant by this a force that was not an electrostatic force, specifically, an electrochemical force. The term was taken up by Michael Faraday in connection with electromagnetic induction in the 1820s. However, a clear definition of voltage and method of measuring it had not been developed at this time. Volta distinguished electromotive force (emf) from "tension" (potential difference): the observed potential difference at the terminals of an electrochemical cell when it was open circuit must exactly balance the emf of the cell so that no current flowed.
Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points, which (in a static electric field) is defined as the work needed per unit of charge to move a test charge between the two points. In the International System of Units, the derived unit for voltage (potential difference) is named "volt". In SI units, work per unit charge is expressed as joules per coulomb, where 1 volt = 1 joule (of work) per 1 coulomb (of charge). The old SI definition for "volt" used power and current, since 1990 quantum Hall and Josephson effect were used and recently (2019) fundamental physical constants were introduced for the definition of all SI units and derived units. Voltage or electric potential difference is denoted symbolically by, simplified "V", or "U", for instance in the context of Ohm's or Kirchhoff's circuit laws.
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summarize: The story involves four teenage friends who take a rowboat along a "river of time" that flows into a mysterious cave and emerges on the other side onto a strange, primeval landscape. The boy actors were Josef Lukáš (Petr, the main narrator), Petr Herrmann (Toník, who also narrates in part), Zdeněk Husták (Jenda), and Vladimír Bejval (Jirka). As they make their way upstream, they realise that they are travelling progressively farther back in time, and face various perils as they do so (but learn much about prehistoric life in the process). The animals depicted in "Cesta do pravěku" were never shown interacting with animals of other periods and it is assumed that different parts of the river represented distinct time periods. The plot is somewhat similar to that of the novel "Plutonia" (1915) by the Russian palaeontologist Vladimir Obruchev, in which a team of Russian explorers enter the Earth's crust via an Arctic portal (a huge depression in the Earth surface created many millions of years previously by the impact of a giant asteroid, into which prehistoric animals had entered), and follow a river that leads them through a sequence of past geological eras and associated animal life. Some scenes in "Cesta do pravěku" recall Arthur Conan Doyle's 1912 novel "The Lost World", with four male protagonists exploring a prehistoric world where they find evidence of native human habitation, are attacked by a group of enraged pterosaurs, witness a twilight fight between a carnivorous dinosaur and a herbivorous one, encounter a "Stegosaurus" up-close, and see one of their members, Petr, nearly chased down by a "Phorusrhacos". Zeman's use of unorthodox and seamless production techniques ensured that the film was free of jerky stop-motion sequences and grainy splicing of stop-motion with real-time footage that characterised Hollywood's animated films until the advent of computer-generated imagery. Filming took place on the Morava river near Bzenec town in the Czech Republic at the nature reserve named (in Czech) Osypané břehy and on studio sets. Zeman was heavily influenced by the palaeo-art of the celebrated Czech artist Zdeněk Burian (1905-1981), and much of the film's imagery was inspired by Burian reconstructions that had been painted under the guidance of Czech palaeontologist Josef Augusta (1903-1968). In some scenes, 2-D 'profile' images of animals originally depicted by Burian were filmed in real time (as in the "Styracosaurus" sequences), whilst other well-known Burian scenes were recreated in stop-motion using a combination of 2-D and 3-D models (as in the "Deinotherium" and "Uintatherium" sequences). Possibly for the sake of continuity, Zeman also used models or 2-D profiles when depicting extant species including bison, a python, flamingos, vultures, various antelopes, giraffes, and a jaguar (which was briefly spliced with footage of a real animal in one of only three instances of live species footage). In some scenes, miniature models of the actors and their boat/raft were also animated. In addition to numerous miniature animal models and 2-D 'profiles', Zeman also used larger models of heads and bodies of animals (including a full-size 'dead' "Stegosaurus" and swimming woolly rhino, "Brontosaurus" and "Trachodon" models), as well as life-sized model plants (as in the Carboniferous forest sequence, and the encounter with the "Styracosaurus"). The use of 2-D profiles and 3-D models animated by concealed means had the advantage of filming in real time without the need for labour-intensive stop-motion. Two of the film's prehistoric species were not based on Burian images; the "Stegosaurus" and the "Ceratosaurus" with which it fights in a twilight scene (it remains unclear as to why Zeman did not use Burian images in these instances). "Cesta do pravěku" was made on what would be considered a small budget by western film-makers. It discussed the various time epochs as defined by palaeontologists and the types of animals typical of those periods, using information known in the 1950s. Whilst many animated feature films, particularly those in the US, used models of prehistoric animals in contrived sequences, Zeman instead depicted animals acting naturally in their own environments as if being filmed for a documentary, with the actors observing from the relative safety of the river. Such a philosophy was unusual at the time and was more typical of later TV productions that depicted prehistoric animals in an educational context (including the BBC's "Walking with Dinosaurs" and "Walking with Beasts" series) which became popular following the advent of computer-generated imagery that negated the need for time-consuming, highly skilled manual animation. The original release of Zeman's film was 93 minutes, although the East German release had a slightly shorter running time. In 1966, another version of the film was released in the US by William Cayton whose company had been marketing Russian animated cartoons and feature films from the 1940s and 1950s, especially those of the famous Soyuzmultfilm studios (well known titles included "The Firebird", "The Frog Prince", "Beauty & the Beast", "The Space Explorers", and "The Twelve Months"). The films were dubbed, sometimes re-titled, partitioned into chapters and distributed to US TV stations. In the case of "Cesta do pravěku", Cayton replaced the opening and closing scenes of the original with new footage of American boys who entered the film in a dream sequence whilst visiting the American Museum of Natural History in New York. The film was copied to poor quality film stock and edited into short segments (about six minutes each) for presentation as a serial, syndicated to various children's television programs. The US version was released on VHS video by "Goodtimes" in 1994. Because of the new sequences, none of the actors' faces could be shown until the original footage began. In April 2001, "Cesta do pravěku" was screened at the "Brooklyn Academy of Music" in Brooklyn, New York, as part of the retrospective entitled "The Fabulous World of Karel Zeman". In 2010, it featured at the 50th "Zlín Film Festival" (May 30 - June 6) in the Czech Republic, one day of which (June 4) was dedicated to Karel Zeman to honour the centenary of his birth. The four original actors also attended the ceremonies (three from the Czech Republic and one - Vladimír Bejval - from the US). In 2004, a DVD version of the film appeared in Japan, in Germany in 2005, and Spain in 2007. The Japanese and Spanish versions had different digital masters. The first German DVD had no digitally remastered images, but another German version with Czech and German dialogue, and 15 min of extras showing some of Zeman's filming techniques, was released in Jan 2010. This version used some modified sound effects for the dubbing, and the picture quality is below that of the original. Unfortunately the announced DVD of the original was held back for licence-juridical reasons and it remained unavailable commercially (as of April 2011) although copies of the original circulate amongst enthusiasts. In February 2020, The Criterion Collection included the film as part of their "Three Fantastic Journeys by Karel Zeman" box set. Several scenes of the film were used by the British ABC (Associated British Corporation) in the 1961 television serial "Pathfinders to Venus". The scenes were that of the Pteranodons flying overhead and the battle between the Ceratosaurus and the Stegosaurus.
Journey to the Beginning of Time (, literally "Journey into prehistory") is a color 1955 Czechoslovak science fiction adventure film directed by Karel Zeman. Produced using a combination of 2-D and 3-D models, it was the first of Zeman's productions to include actors in conjunction with stop-motion and special effects. It won awards at the International Film Festivals of Venice and Mannheim.
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summarize: The Gregorian calendar is a solar calendar with 12 months of 28–31 days each. A regular Gregorian year consists of 365 days, but in certain years known as leap years, a leap day is added to February. Gregorian years are identified by consecutive year numbers. A calendar date is fully specified by the year (numbered according to a calendar era, in this case "Anno Domini" or Common Era), the month (identified by name or number), and the day of the month (numbered sequentially starting from 1). Although the calendar year currently runs from 1 January to 31 December, at previous times year numbers were based on a different starting point within the calendar (see the "beginning of the year" section below). In the Julian calendar, a leap year occurred every 4 years, and the leap day was inserted by doubling 24 February. The Gregorian reform omitted a leap day in three of every 400 years and left the leap day unchanged. However, it has become customary in the modern period to number the days sequentially with no gaps, and 29 February is typically considered as the leap day. Before the 1969 revision of the Roman Calendar, the Roman Catholic Church delayed February feasts after the 23rd by one day in leap years; Masses celebrated according to the previous calendar still reflect this delay. Calendar cycles repeat completely every 400 years, which equals 146,097 days. Of these 400 years, 303 are regular years of 365 days and 97 are leap years of 366 days. A mean calendar year is days = 365.2425 days, or 365 days, 5 hours, 49 minutes and 12 seconds. The Gregorian calendar was a reform of the Julian calendar. It was instituted by papal bull "Inter gravissimas" dated 24 February 1582 by Pope Gregory XIII, after whom the calendar is named. The motivation for the adjustment was to bring the date for the celebration of Easter to the time of year in which it was celebrated when it was introduced by the early Church. The error in the Julian calendar (its assumption that there are exactly 365.25 days in a year) had led to the date of the equinox according to the calendar drifting from the observed reality, and thus an error had been introduced into the calculation of the date of Easter. Although a recommendation of the First Council of Nicaea in 325 specified that all Christians should celebrate Easter on the same day, it took almost five centuries before virtually all Christians achieved that objective by adopting the rules of the Church of Alexandria (see Easter for the issues which arose). Because the date of Easter is a function the "computus" of the date of the (northern hemisphere) spring equinox, the Catholic Church considered unacceptable the increasing divergence between the canonical date of the equinox and observed reality. Easter is celebrated on the Sunday after the ecclesiastical full moon on or after 21 March, which was adopted as approximation to the March equinox. European scholars had been well aware of the calendar drift since the early medieval period. Bede, writing in the 8th century, showed that the accumulated error in his time was more than three days. Roger Bacon in c. 1200 estimated the error at seven or eight days. Dante, writing c. 1300, was aware of the need of a calendar reform. The first attempt to go forward with such a reform was undertaken by Pope Sixtus IV, who in 1475 invited Regiomontanus to the Vatican for this purpose. However, the project was interrupted by the death of Regiomontanus shortly after his arrival in Rome. The increase of astronomical knowledge and the precision of observations towards the end of the 15th century made the question more pressing. Numerous publications over the following decades called for a calendar reform, among them two papers sent to the Vatican by the University of Salamanca in 1515 and 1578, but the project was not taken up again until the 1540s, and implemented only under Pope Gregory XIII (r. 1572–1585). In 1545, the Council of Trent authorised Pope Paul III to reform the calendar, requiring that the date of the vernal equinox be restored to that which it held at the time of the First Council of Nicaea in 325 and that an alteration to the calendar be designed to prevent future drift. This would allow for a more consistent and accurate scheduling of the feast of Easter. In 1577, a "Compendium" was sent to expert mathematicians outside the reform commission for comments. Some of these experts, including Giambattista Benedetti and Giuseppe Moleto, believed Easter should be computed from the true motions of the Sun and Moon, rather than using a tabular method, but these recommendations were not adopted. The reform adopted was a modification of a proposal made by the Calabrian doctor Aloysius Lilius (or Lilio). Lilius's proposal included reducing the number of leap years in four centuries from 100 to 97, by making three out of four centurial years common instead of leap years. He also produced an original and practical scheme for adjusting the epacts of the Moon when calculating the annual date of Easter, solving a long-standing obstacle to calendar reform. Ancient tables provided the Sun's mean longitude. The German mathematician Christopher Clavius, the architect of the Gregorian calendar, noted that the tables agreed neither on the time when the Sun passed through the vernal equinox nor on the length of the mean tropical year. Tycho Brahe also noticed discrepancies. The Gregorian leap year rule (97 leap years in 400 years) was put forward by Petrus Pitatus of Verona in 1560. He noted that it is consistent with the tropical year of the Alfonsine tables and with the mean tropical year of Copernicus ("De revolutionibus") and Erasmus Reinhold ("Prutenic tables"). The three mean tropical years in Babylonian sexagesimals as the excess over 365 days (the way they would have been extracted from the tables of mean longitude) were 0;14,33,9,57 (Alfonsine), 0;14,33,11,12 (Copernicus) and 0;14,33,9,24 (Reinhold). In decimal notation, these are equal to 0.24254606, 0.24255185, and 0.24254352, respectively. All values are the same to two sexagesimal places (0;14,33, equal to decimal 0.2425) and this is also the mean length of the Gregorian year. Thus Pitatus' solution would have commended itself to the astronomers. Lilius's proposals had two components. First, he proposed a correction to the length of the year. The mean tropical year is 365.24219 days long. A commonly used value in Lilius's time, from the Alfonsine tables, is 365.2425463 days. As the average length of a Julian year is 365.25 days, the Julian year is almost 11 minutes longer than the mean tropical year. The discrepancy results in a drift of about three days every 400 years. Lilius's proposal resulted in an average year of 365.2425 days (see Accuracy). At the time of Gregory's reform there had already been a drift of 10 days since the Council of Nicaea, resulting in the vernal equinox falling on 10 or 11 March instead of the ecclesiastically fixed date of 21 March, and if unreformed it would have drifted further. Lilius proposed that the 10-day drift should be corrected by deleting the Julian leap day on each of its ten occurrences over a period of forty years, thereby providing for a gradual return of the equinox to 21 March. Lilius's work was expanded upon by Christopher Clavius in a closely argued, 800-page volume. He would later defend his and Lilius's work against detractors. Clavius's opinion was that the correction should take place in one move, and it was this advice which prevailed with Gregory. The second component consisted of an approximation which would provide an accurate yet simple, rule-based calendar. Lilius's formula was a 10-day correction to revert the drift since the Council of Nicaea, and the imposition of a leap day in only 97 years in 400 rather than in 1 year in 4. The proposed rule was that "years divisible by 100 would be leap years only if they were divisible by 400 as well". The 19-year cycle used for the lunar calendar was also to be corrected by one day every 300 or 400 years (8 times in 2500 years) along with corrections for the years that are no longer leap years (i.e. 1700, 1800, 1900, 2100, etc.) In fact, a new method for computing the date of Easter was introduced. When the new calendar was put in use, the error accumulated in the 13 centuries since the Council of Nicaea was corrected by a deletion of 10 days. The Julian calendar day Thursday, 4 October 1582 was followed by the first day of the Gregorian calendar, Friday, 15 October 1582 (the cycle of weekdays was not affected). A month after having decreed the reform, the pope (with a brief of 3 April 1582) granted to one Antoni Lilio the exclusive right to publish the calendar for a period of ten years. The "Lunario Novo secondo la nuova riforma" was printed by Vincenzo Accolti, one of the first calendars printed in Rome after the reform, notes at the bottom that it was signed with papal authorization and by Lilio ("Con licentia delli Superiori... et permissu Ant(onii) Lilij"). The papal brief was revoked on 20 September 1582, because Antonio Lilio proved unable to keep up with the demand for copies. Although Gregory's reform was enacted in the most solemn of forms available to the Church, the bull had no authority beyond the Catholic Church and the Papal States. The changes that he was proposing were changes to the civil calendar, over which he had no authority. They required adoption by the civil authorities in each country to have legal effect. The bull "Inter gravissimas" became the law of the Catholic Church in 1582, but it was not recognised by Protestant Churches, Eastern Orthodox Churches, Oriental Orthodox Churches, and a few others. Consequently, the days on which Easter and related holidays were celebrated by different Christian Churches again diverged. On 29 September 1582, Philip II of Spain decreed the change from the Julian to the Gregorian calendar. This affected much of Roman Catholic Europe, as Philip was at the time ruler over Spain and Portugal as well as much of Italy. In these territories, as well as in the Polish–Lithuanian Commonwealth (ruled by Anna Jagiellon) and in the Papal States, the new calendar was implemented on the date specified by the bull, with Julian Thursday, 4 October 1582, being followed by Gregorian Friday, 15 October 1582. The Spanish and Portuguese colonies followed somewhat later "de facto" because of delay in communication. Many Protestant countries initially objected to adopting a Catholic innovation; some Protestants feared the new calendar was part of a plot to return them to the Catholic fold. For example, the British could not bring themselves to adopt the Catholic system explicitly: the Annexe to their Calendar (New Style) Act 1750 established a computation for the date of Easter that achieved the same result as Gregory's rules, without actually referring to him. Britain and the British Empire (including the eastern part of what is now the United States) adopted the Gregorian calendar in 1752. Sweden followed in 1753. Prior to 1917, Turkey used the lunar Islamic calendar with the Hegira era for general purposes and the Julian calendar for fiscal purposes. The start of the fiscal year was eventually fixed at 1 March and the year number was roughly equivalent to the Hegira year (see Rumi calendar). As the solar year is longer than the lunar year this originally entailed the use of "escape years" every so often when the number of the fiscal year would jump. From 1 March 1917 the fiscal year became Gregorian, rather than Julian. On 1 January 1926 the use of the Gregorian calendar was extended to include use for general purposes and the number of the year became the same as in most other countries. This section always places the intercalary day on even though it was always obtained by doubling (the "bissextum" (twice sixth) or bissextile day) until the late Middle Ages. The Gregorian calendar is proleptic before 1582 (assumed to exist before 1582), and the difference between Gregorian and Julian calendar dates increases by three days every four centuries (all date ranges are inclusive). The following equation gives the number of days (actually, dates) that the Gregorian calendar is ahead of the Julian calendar, called the "secular difference" between the two calendars. A negative difference means the Julian calendar is ahead of the Gregorian calendar. where formula_2 is the secular difference and formula_3 is the year using astronomical year numbering, that is, use for BC years. formula_4 means that if the result of the division is not an integer it is rounded down to the nearest integer. Thus during the 1900s, 1900/400 = 4, while during the −500s, −500/400 = −2. The general rule, in years which are leap years in the Julian calendar but not the Gregorian, is: Up to 28 February in the calendar being converted, add one day less or subtract one day more than the calculated value. Give February the appropriate number of days for the calendar being converted. When subtracting days to calculate the Gregorian equivalent of 29 February (Julian), 29 February is discounted. Thus if the calculated value is −4 the Gregorian equivalent of this date is 24 February. The year used in dates during the Roman Republic and the Roman Empire was the consular year, which began on the day when consuls first entered office—probably 1 May before 222 BC, 15 March from 222 BC and 1 January from 153 BC. The Julian calendar, which began in 45 BC, continued to use 1 January as the first day of the new year. Even though the year used for dates changed, the civil year always displayed its months in the order January to December from the Roman Republican period until the present. During the Middle Ages, under the influence of the Catholic Church, many Western European countries moved the start of the year to one of several important Christian festivals—25 December (supposed Nativity of Jesus), 25 March (Annunciation), or Easter (France), while the Byzantine Empire began its year on 1 September and Russia did so on 1 March until 1492 when the new year was moved to 1 September. In common usage, 1 January was regarded as New Year's Day and celebrated as such, but from the 12th century until 1751 the legal year in England began on 25 March (Lady Day). So, for example, the Parliamentary record lists the execution of Charles I on 30 January as occurring in 1648 (as the year did not end until 24 March), although later histories adjust the start of the year to 1 January and record the execution as occurring in 1649. Most Western European countries changed the start of the year to 1 January before they adopted the Gregorian calendar. For example, Scotland changed the start of the Scottish New Year to 1 January in 1600 (this means that 1599 was a short year). England, Ireland and the British colonies changed the start of the year to 1 January in 1752 (so 1751 was a short year with only 282 days) though in England the start of the tax year remained at 25 March (O.S.), 5 April (N.S.) until 1800, when it moved to 6 April. Later in 1752 in September the Gregorian calendar was introduced throughout Britain and the British colonies (see the section Adoption). These two reforms were implemented by the Calendar (New Style) Act 1750. In some countries, an official decree or law specified that the start of the year should be 1 January. For such countries a specific year when a 1 January-year became the norm can be identified. In other countries the customs varied, and the start of the year moved back and forth as fashion and influence from other countries dictated various customs. Neither the papal bull nor its attached canons explicitly fix such a date, though it is implied by two tables of saint's days, one labelled 1582 which ends on 31 December, and another for any full year that begins on 1 January. It also specifies its epact relative to 1 January, in contrast with the Julian calendar, which specified it relative to 22 March. The old date was derived from the Greek system: the earlier "Supputatio Romana" specified it relative to 1 January. During the period between 1582, when the first countries adopted the Gregorian calendar, and 1923, when the last European country adopted it, it was often necessary to indicate the date of some event in both the Julian calendar and in the Gregorian calendar, for example, "10/21 February 1750/51", where the dual year accounts for some countries already beginning their numbered year on 1 January while others were still using some other date. Even before 1582, the year sometimes had to be double dated because of the different beginnings of the year in various countries. Woolley, writing in his biography of John Dee (1527–1608/9), notes that immediately after 1582 English letter writers "customarily" used "two dates" on their letters, one OS and one NS. "Old Style" (OS) and "New Style" (NS) are sometimes added to dates to identify which calendar reference system is used for the date given. In Britain and its colonies, where the Calendar Act of 1750 altered the start of the year, and also aligned the British calendar with the Gregorian calendar, there is some confusion as to what these terms mean. They can indicate that the start of the Julian year has been adjusted to start on 1 January (NS) even though contemporary documents use a different start of year (OS); or to indicate that a date conforms to the Julian calendar (OS), formerly in use in many countries, rather than the Gregorian calendar (NS). Extending the Gregorian calendar backwards to dates preceding its official introduction produces a proleptic calendar, which should be used with some caution. For ordinary purposes, the dates of events occurring prior to 15 October 1582 are generally shown as they appeared in the Julian calendar, with the year starting on 1 January, and no conversion to their Gregorian equivalents. For example, the Battle of Agincourt is universally considered to have been fought on 25 October 1415 which is Saint Crispin's Day. Usually, the mapping of new dates onto old dates with a start of year adjustment works well with little confusion for events that happened before the introduction of the Gregorian calendar. But for the period between the first introduction of the Gregorian calendar on 15 October 1582 and its introduction in Britain on 14 September 1752, there can be considerable confusion between events in continental western Europe and in British domains in English language histories. Events in continental western Europe are usually reported in English language histories as happening under the Gregorian calendar. For example, the Battle of Blenheim is always given as 13 August 1704. Confusion occurs when an event affects both. For example, William III of England set sail from the Netherlands on 11 November 1688 (Gregorian calendar) and arrived at Brixham in England on 5 November 1688 (Julian calendar). Shakespeare and Cervantes seemingly died on exactly the same date (23 April 1616), but Cervantes predeceased Shakespeare by ten days in real time (as Spain used the Gregorian calendar, but Britain used the Julian calendar). This coincidence encouraged UNESCO to make 23 April the World Book and Copyright Day. Astronomers avoid this ambiguity by the use of the Julian day number. For dates before the year 1, unlike the proleptic Gregorian calendar used in the international standard ISO 8601, the traditional proleptic Gregorian calendar (like the Julian calendar) does not have a year 0 and instead uses the ordinal numbers 1, 2,... both for years AD and BC. Thus the traditional time line is 2 BC, 1 BC, AD 1, and AD 2. ISO 8601 uses astronomical year numbering which includes a year 0 and negative numbers before it. Thus the ISO 8601 time line is, 0000, 0001, and 0002. The Gregorian calendar continued to employ the Julian months, which have Latinate names and irregular numbers of days: Europeans sometimes attempt to remember the number of days in each month by memorizing some form of the traditional verse "Thirty Days Hath September". It appears in Latin, Italian, and French, and belongs to a broad oral tradition but the earliest currently attested form of the poem is the English marginalia inserted into a calendar of saints : Variations appeared in "Mother Goose" and continue to be taught at schools. The unhelpfulness of such involved mnemonics has been parodied as "Thirty days hath September/ But all the rest I can't remember" but it has also been called "probably the only sixteenth-century poem most ordinary citizens know by heart". A common nonverbal alternative is the knuckle mnemonic, considering the knuckles of one's hands as months with 31 days and the lower spaces between them as the months with fewer days. Using two hands, one may start from either pinkie knuckle as January and count across, omitting the space between the index knuckles (July and August). The same procedure can be done using the knuckles of a single hand, returning from the last (July) to the first (August) and continuing through. A similar mnemonic is to move up a piano keyboard in semitones from an F key, taking the white keys as the longer months and the black keys as the shorter ones. In conjunction with the system of months there is a system of weeks. A physical or electronic calendar provides conversion from a given date to the weekday, and shows multiple dates for a given weekday and month. Calculating the day of the week is not very simple, because of the irregularities in the Gregorian system. When the Gregorian calendar was adopted by each country, the weekly cycle continued uninterrupted. For example, in the case of the few countries that adopted the reformed calendar on the date proposed by Gregory XIII for the calendar's adoption, Friday, 15 October 1582, the preceding date was Thursday, 4 October 1582 (Julian calendar). Opinions vary about the numbering of the days of the week. ISO 8601, in common use worldwide, starts with Monday=1; printed monthly calendar grids often list Mondays in the first (left) column of dates and Sundays in the last. In North America, the week typically begins on Sunday and ends on Saturday. The Gregorian calendar improves the approximation made by the Julian calendar by skipping three Julian leap days in every 400 years, giving an average year of 365.2425 mean solar days long. This approximation has an error of about one day per 3,030 years with respect to the current value of the mean tropical year. However, because of the precession of the equinoxes, which is not constant, and the movement of the perihelion (which affects the Earth's orbital speed) the error with respect to the "astronomical" vernal equinox is variable; using the average interval between vernal equinoxes near 2000 of 365.24237 days implies an error closer to 1 day every 7,700 years. By any criterion, the Gregorian calendar is substantially more accurate than the 1 day in 128 years error of the Julian calendar (average year 365.25 days). In the 19th century, Sir John Herschel proposed a modification to the Gregorian calendar with 969 leap days every 4000 years, instead of 970 leap days that the Gregorian calendar would insert over the same period. This would reduce the average year to 365.24225 days. Herschel's proposal would make the year 4000, and multiples thereof, common instead of leap. While this modification has often been proposed since, it has never been officially adopted. On time scales of thousands of years, the Gregorian calendar falls behind the astronomical seasons. This is because the Earth's speed of rotation is gradually slowing down, which makes each day slightly longer over time (see tidal acceleration and leap second) while the year maintains a more uniform duration. This image shows the difference between the Gregorian calendar and the astronomical seasons. The "y"-axis is the date in June and the "x"-axis is Gregorian calendar years. Each point is the date and time of the June solstice in that particular year. The error shifts by about a quarter of a day per year. Centurial years are ordinary years, unless they are divisible by 400, in which case they are leap years. This causes a correction in the years 1700, 1800, 1900, 2100, 2200, and 2300. For instance, these corrections cause 23 December 1903 to be the latest December solstice, and 20 December 2096 to be the earliest solstice—about 2.35 days of variation compared with the seasonal event. The following are proposed reforms of the Gregorian calendar: Precursors of the Gregorian reform
The Gregorian calendar is the calendar used in most of the world. It is named after Pope Gregory XIII, who introduced it in October 1582.
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summarize: Classical mechanics explores concepts such as force, energy, potential, etc. Force and potential energy are directly related. A net force acting on any object will cause it to accelerate. As an object moves in the direction in which the force accelerates it, its potential energy decreases. For example, the gravitational potential energy of a cannonball at the top of a hill is greater than at the base of the hill. As it rolls downhill its potential energy decreases, being translated to motion, kinetic energy. It is possible to define the potential of certain force fields so that the potential energy of an object in that field depends only on the position of the object with respect to the field. Two such force fields are the gravitational field and an electric field (in the absence of time-varying magnetic fields). Such fields must affect objects due to the intrinsic properties of the object (e.g., mass or charge) and the position of the object. Objects may possess a property known as electric charge and an electric field exerts a force on charged objects. If the charged object has a positive charge the force will be in the direction of the electric field vector at that point while if the charge is negative the force will be in the opposite direction. The magnitude of the force is given by the quantity of the charge multiplied by the magnitude of the electric field vector. The electric potential at a point r in a static electric field E is given by the line integral where "C" is an arbitrary path connecting the point with zero potential to r. When the curl is zero, the line integral above does not depend on the specific path "C" chosen but only on its endpoints. In this case, the electric field is conservative and determined by the gradient of the potential: Then, by Gauss's law, the potential satisfies Poisson's equation: where "ρ" is the total charge density (including bound charge) and ∇· denotes the divergence. The concept of electric potential is closely linked with potential energy. A test charge "q" has an electric potential energy "U" given by The potential energy and hence also the electric potential is only defined up to an additive constant: one must arbitrarily choose a position where the potential energy and the electric potential are zero. These equations cannot be used if the curl, i.e., in the case of a "non-conservative electric field" (caused by a changing magnetic field; see Maxwell's equations). The generalization of electric potential to this case is described below. The electric potential arising from a point charge "Q", at a distance "r" from the charge is observed to be where "ε" is the permittivity of vacuum. formula_6 is known as the Coulomb potential. The electric potential for a system of point charges is equal to the sum of the point charges' individual potentials. This fact simplifies calculations significantly, because addition of potential (scalar) fields is much easier than addition of the electric (vector) fields. Specifically, the potential of a set of discrete point charges "q" at points r becomes and the potential of a continuous charge distribution "ρ"(r) becomes The equations given above for the electric potential (and all the equations used here) are in the forms required by SI units. In some other (less common) systems of units, such as CGS-Gaussian, many of these equations would be altered. When time-varying magnetic fields are present (which is true whenever there are time-varying electric fields and vice versa), it is not possible to describe the electric field simply in terms of a scalar potential "V" because the electric field is no longer conservative: formula_9 is path-dependent because formula_10 (Faraday's law of induction). Instead, one can still define a scalar potential by also including the magnetic vector potential A. In particular, A is defined to satisfy: where B is the magnetic field. Because the divergence of the magnetic field is always zero due to the absence of magnetic monopoles, such an A can always be found. Given this, the quantity "is" a conservative field by Faraday's law and one can therefore write where "V" is the scalar potential defined by the conservative field F. The electrostatic potential is simply the special case of this definition where A is time-invariant. On the other hand, for time-varying fields, unlike electrostatics. The SI derived unit of electric potential is the volt (in honor of Alessandro Volta), which is why a difference in electric potential between two points is known as voltage. Older units are rarely used today. Variants of the centimetre–gram–second system of units included a number of different units for electric potential, including the abvolt and the statvolt. Inside metals (and other solids and liquids), the energy of an electron is affected not only by the electric potential, but also by the specific atomic environment that it is in. When a voltmeter is connected between two different types of metal, it measures not the electric potential difference, but instead the potential difference corrected for the different atomic environments. The quantity measured by a voltmeter is called electrochemical potential or fermi level, while the pure unadjusted electric potential "V" is sometimes called Galvani potential formula_15. The terms "voltage" and "electric potential" are a bit ambiguous in that, in practice, they can refer to "either" of these in different contexts.
An electric potential (also called the "electric field potential", potential drop or the electrostatic potential) is the amount of work needed to move a unit of charge from a reference point to a specific point inside the field without producing an acceleration. Typically, the reference point is the Earth or a point at infinity, although any point can be used.
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summarize: "Distant Journey" follows Hana, a Jewish eye doctor who falls in love and marries a Gentile named Toník. Their simple love story becomes a nightmare when the government begins the systematized extermination of the Jews. Hana's family is transported to Theresienstadt, and the romance becomes a struggle for survival. Radok never shows blood or lets a gun fire in his story, but the historic footage he integrates into the film achieves a sense of terror. Newsreel footage and clips from Leni Riefenstahl's "Triumph of the Will" show Adolf Hitler, Joseph Goebbels, and other Nazi leaders reading speeches while a pile of dead nude bodies on the grounds of a concentration camp enforce the atmosphere of the Holocaust. While the historic war-time footage is shown, the previous scene of the feature film is shrunk to the lower right hand corner of the screen, a picture-in-picture effect comparing the wider global conflict to the more immediate effects on the story's central characters. The slow spread of anti-Semitism that led to the deportation and murder of the Jews is played out in the film. For example, in 1941 Jews were no longer allowed to go to the theater in Prague. Dressed in stunning attire, the happy couple are just about to leave for the theater when they receive this foreboding news from Hana's dejected father. In this way, Radok feeds his audience the history of the war through a personal and easily digested narrative. The film is full of symbolic cinematography. For example, when a minor character, Professor Reiter, commits suicide, strange camera angles show the old man sitting in his apartment, his open window, the cobblestone street far below, and the stopped hands on a clock. When shrill screams echo from the street and the apartment is empty, the audience is to assume the awful truth. After being banned for forty years, "Distant Journey" reemerged in the Czechoslovkia after the Velvet Revolution for a 1991 television premiere, and was hailed by critics. In the "Village Voice" J. Hoberman called it a "masterpiece", comparing Radok to Orson Welles New York Times critic Bosley Crowther describet it as "the most brilliant, the most horrifying film on the Nazi's persecution of the Jews that this reviewer has yet seen" The film is applauded for both its expressionist cinematography and historical relevance, being one of the first films to confront the Holocaust, only three years after it occurred. Footage from "Distant Journey" appears in Stanley Kubrick's 1971 film "A Clockwork Orange." Kubrick incorporated the shots of children playing amidst rubble into his film.
Distant Journey () is a Czech Holocaust film directed by Alfréd Radok and released in 1949, not long after World War II. Radok uses experimental cinematography, blending historic footage of the Nazis with a fictional love story between a Jewish woman and her Gentile husband.
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summarize: Acoustics is the interdisciplinary science that deals with the study of mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound, and infrasound. A scientist who works in the field of acoustics is an "acoustician", while someone working in the field of acoustical engineering may be called an "acoustical engineer". An audio engineer, on the other hand, is concerned with the recording, manipulation, mixing, and reproduction of sound. Applications of acoustics are found in almost all aspects of modern society, subdisciplines include aeroacoustics, audio signal processing, architectural acoustics, bioacoustics, electro-acoustics, environmental noise, musical acoustics, noise control, psychoacoustics, speech, ultrasound, underwater acoustics, and vibration. Sound is defined as "(a) Oscillation in pressure, stress, particle displacement, particle velocity, etc., propagated in a medium with internal forces (e.g., elastic or viscous), or the superposition of such propagated oscillation. (b) Auditory sensation evoked by the oscillation described in (a)." Sound can be viewed as a wave motion in air or other elastic media. In this case, sound is a stimulus. Sound can also be viewed as an excitation of the hearing mechanism that results in the perception of sound. In this case, sound is a sensation. Sound can propagate through a medium such as air, water and solids as longitudinal waves and also as a transverse wave in solids (see Longitudinal and transverse waves, below). The sound waves are generated by a sound source, such as the vibrating diaphragm of a stereo speaker. The sound source creates vibrations in the surrounding medium. As the source continues to vibrate the medium, the vibrations propagate away from the source at the speed of sound, thus forming the sound wave. At a fixed distance from the source, the pressure, velocity, and displacement of the medium vary in time. At an instant in time, the pressure, velocity, and displacement vary in space. Note that the particles of the medium do not travel with the sound wave. This is intuitively obvious for a solid, and the same is true for liquids and gases (that is, the vibrations of particles in the gas or liquid transport the vibrations, while the "average" position of the particles over time does not change). During propagation, waves can be reflected, refracted, or attenuated by the medium. The behavior of sound propagation is generally affected by three things: When sound is moving through a medium that does not have constant physical properties, it may be refracted (either dispersed or focused). The mechanical vibrations that can be interpreted as sound can travel through all forms of matter: gases, liquids, solids, and plasmas. The matter that supports the sound is called the medium. Sound cannot travel through a vacuum. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves. Longitudinal sound waves are waves of alternating pressure deviations from the equilibrium pressure, causing local regions of compression and rarefaction, while transverse waves (in solids) are waves of alternating shear stress at right angle to the direction of propagation. Sound waves may be "viewed" using parabolic mirrors and objects that produce sound. The energy carried by an oscillating sound wave converts back and forth between the potential energy of the extra compression (in case of longitudinal waves) or lateral displacement strain (in case of transverse waves) of the matter, and the kinetic energy of the displacement velocity of particles of the medium. Although there are many complexities relating to the transmission of sounds, at the point of reception (i.e. the ears), sound is readily dividable into two simple elements: pressure and time. These fundamental elements form the basis of all sound waves. They can be used to describe, in absolute terms, every sound we hear. In order to understand the sound more fully, a complex wave such as the one shown in a blue background on the right of this text, is usually separated into its component parts, which are a combination of various sound wave frequencies (and noise). Sound waves are often simplified to a description in terms of sinusoidal plane waves, which are characterized by these generic properties: Sound that is perceptible by humans has frequencies from about 20 Hz to 20,000 Hz. In air at standard temperature and pressure, the corresponding wavelengths of sound waves range from to. Sometimes speed and direction are combined as a velocity vector; wave number and direction are combined as a wave vector. Transverse waves, also known as shear waves, have the additional property, "polarization", and are not a characteristic of sound waves. The speed of sound depends on the medium the waves pass through, and is a fundamental property of the material. The first significant effort towards measurement of the speed of sound was made by Isaac Newton. He believed the speed of sound in a particular substance was equal to the square root of the pressure acting on it divided by its density: This was later proven wrong when found to incorrectly derive the speed. The French mathematician Laplace corrected the formula by deducing that the phenomenon of sound travelling is not isothermal, as believed by Newton, but adiabatic. He added another factor to the equation—"gamma"—and multiplied formula_2 by formula_3, thus coming up with the equation formula_4. Since formula_5, the final equation came up to be formula_6, which is also known as the Newton–Laplace equation. In this equation, "K" is the elastic bulk modulus, "c" is the velocity of sound, and formula_7 is the density. Thus, the speed of sound is proportional to the square root of the ratio of the bulk modulus of the medium to its density. Those physical properties and the speed of sound change with ambient conditions. For example, the speed of sound in gases depends on temperature. In air at sea level, the speed of sound is approximately using the formula. In fresh water, also at 20 °C, the speed of sound is approximately. In steel, the speed of sound is about. The speed of sound is also slightly sensitive, being subject to a second-order anharmonic effect, to the sound amplitude, which means there are non-linear propagation effects, such as the production of harmonics and mixed tones not present in the original sound (see parametric array). If relativistic effects are important, the speed of sound is calculated from the relativistic Euler equations. A distinct use of the term "sound" from its use in physics is that in physiology and psychology, where the term refers to the subject of "perception" by the brain. The field of psychoacoustics is dedicated to such studies. Webster's 1936 dictionary defined sound as: "1. The sensation of hearing, that which is heard; specif.: a. Psychophysics. Sensation due to stimulation of the auditory nerves and auditory centers of the brain, usually by vibrations transmitted in a material medium, commonly air, affecting the organ of hearing. b. Physics. Vibrational energy which occasions such a sensation. Sound is propagated by progressive longitudinal vibratory disturbances (sound waves)." This means that the correct response to the question: "if a tree falls in the forest with no one to hear it fall, does it make a sound?" is "yes", and "no", dependent on whether being answered using the physical, or the psychophysical definition, respectively. The physical reception of sound in any hearing organism is limited to a range of frequencies. Humans normally hear sound frequencies between approximately 20 Hz and 20,000 Hz (20 kHz), The upper limit decreases with age. Sometimes "sound" refers to only those vibrations with frequencies that are within the hearing range for humans or sometimes it relates to a particular animal. Other species have different ranges of hearing. For example, dogs can perceive vibrations higher than 20 kHz. As a signal perceived by one of the major senses, sound is used by many species for detecting danger, navigation, predation, and communication. Earth's atmosphere, water, and virtually any physical phenomenon, such as fire, rain, wind, surf, or earthquake, produces (and is characterized by) its unique sounds. Many species, such as frogs, birds, marine and terrestrial mammals, have also developed special organs to produce sound. In some species, these produce song and speech. Furthermore, humans have developed culture and technology (such as music, telephone and radio) that allows them to generate, record, transmit, and broadcast sound. Noise is a term often used to refer to an unwanted sound. In science and engineering, noise is an undesirable component that obscures a wanted signal. However, in sound perception it can often be used to identify the source of a sound and is an important component of timbre perception (see above). Soundscape is the component of the acoustic environment that can be perceived by humans. The acoustic environment is the combination of all sounds (whether audible to humans or not) within a given area as modified by the environment and understood by people, in context of the surrounding environment. There are, historically, six experimentally separable ways in which sound waves are analysed. They are: pitch, duration, loudness, timbre, sonic texture and spatial location. Some of these terms have a standardised definition (for instance in the ANSI Acoustical Terminology ANSI/ASA S1.1-2013). More recent approaches have also considered temporal envelope and temporal fine structure as perceptually relevant analyses. Pitch is perceived as how "low" or "high" a sound is and represents the cyclic, repetitive nature of the vibrations that make up sound. For simple sounds, pitch relates to the frequency of the slowest vibration in the sound (called the fundamental harmonic). In the case of complex sounds, pitch perception can vary. Sometimes individuals identify different pitches for the same sound, based on their personal experience of particular sound patterns. Selection of a particular pitch is determined by pre-conscious examination of vibrations, including their frequencies and the balance between them. Specific attention is given to recognising potential harmonics. Every sound is placed on a pitch continuum from low to high. For example: white noise (random noise spread evenly across all frequencies) sounds higher in pitch than pink noise (random noise spread evenly across octaves) as white noise has more high frequency content. Figure 1 shows an example of pitch recognition. During the listening process, each sound is analysed for a repeating pattern (See Figure 1: orange arrows) and the results forwarded to the auditory cortex as a single pitch of a certain height (octave) and chroma (note name). Duration is perceived as how "long" or "short" a sound is and relates to onset and offset signals created by nerve responses to sounds. The duration of a sound usually lasts from the time the sound is first noticed until the sound is identified as having changed or ceased. Sometimes this is not directly related to the physical duration of a sound. For example; in a noisy environment, gapped sounds (sounds that stop and start) can sound as if they are continuous because the offset messages are missed owing to disruptions from noises in the same general bandwidth. This can be of great benefit in understanding distorted messages such as radio signals that suffer from interference, as (owing to this effect) the message is heard as if it was continuous. Figure 2 gives an example of duration identification. When a new sound is noticed (see Figure 2, Green arrows), a sound onset message is sent to the auditory cortex. When the repeating pattern is missed, a sound offset messages is sent. Loudness is perceived as how "loud" or "soft" a sound is and relates to the totalled number of auditory nerve stimulations over short cyclic time periods, most likely over the duration of theta wave cycles. This means that at short durations, a very short sound can sound softer than a longer sound even though they are presented at the same intensity level. Past around 200 ms this is no longer the case and the duration of the sound no longer affects the apparent loudness of the sound. Figure 3 gives an impression of how loudness information is summed over a period of about 200 ms before being sent to the auditory cortex. Louder signals create a greater 'push' on the Basilar membrane and thus stimulate more nerves, creating a stronger loudness signal. A more complex signal also creates more nerve firings and so sounds louder (for the same wave amplitude) than a simpler sound, such as a sine wave. Timbre is perceived as the quality of different sounds (e.g. the thud of a fallen rock, the whir of a drill, the tone of a musical instrument or the quality of a voice) and represents the pre-conscious allocation of a sonic identity to a sound (e.g. “it's an oboe!"). This identity is based on information gained from frequency transients, noisiness, unsteadiness, perceived pitch and the spread and intensity of overtones in the sound over an extended time frame. The way a sound changes over time (see figure 4) provides most of the information for timbre identification. Even though a small section of the wave form from each instrument looks very similar (see the expanded sections indicated by the orange arrows in figure 4), differences in changes over time between the clarinet and the piano are evident in both loudness and harmonic content. Less noticeable are the different noises heard, such as air hisses for the clarinet and hammer strikes for the piano. Sonic texture relates to the number of sound sources and the interaction between them. The word 'texture', in this context, relates to the cognitive separation of auditory objects. In music, texture is often referred to as the difference between unison, polyphony and homophony, but it can also relate (for example) to a busy cafe; a sound which might be referred to as 'cacophony'. However texture refers to more than this. The texture of an orchestral piece is very different from the texture of a brass quintet because of the different numbers of players. The texture of a market place is very different from a school hall because of the differences in the various sound sources. Spatial location (see: Sound localization) represents the cognitive placement of a sound in an environmental context; including the placement of a sound on both the horizontal and vertical plane, the distance from the sound source and the characteristics of the sonic environment. In a thick texture, it is possible to identify multiple sound sources using a combination of spatial location and timbre identification. This is the main reason why we can pick the sound of an oboe in an orchestra and the words of a single person at a cocktail party. Sound pressure is the difference, in a given medium, between average local pressure and the pressure in the sound wave. A square of this difference (i.e., a square of the deviation from the equilibrium pressure) is usually averaged over time and/or space, and a square root of this average provides a root mean square (RMS) value. For example, 1 Pa RMS sound pressure (94 dBSPL) in atmospheric air implies that the actual pressure in the sound wave oscillates between (1 atm formula_8 Pa) and (1 atm formula_9 Pa), that is between 101323.6 and 101326.4 Pa. As the human ear can detect sounds with a wide range of amplitudes, sound pressure is often measured as a level on a logarithmic decibel scale. The sound pressure level (SPL) or "L" is defined as Since the human ear does not have a flat spectral response, sound pressures are often frequency weighted so that the measured level matches perceived levels more closely. The International Electrotechnical Commission (IEC) has defined several weighting schemes. A-weighting attempts to match the response of the human ear to noise and A-weighted sound pressure levels are labeled dBA. C-weighting is used to measure peak levels. Ultrasound is sound waves with frequencies higher than 20,000 Hz (or 20 kHz). Ultrasound is not different from "normal" (audible) sound in its physical properties, except in that humans cannot hear it. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz. Ultrasound is commonly used for medical diagnostics such as sonograms. Infrasound is sound waves with frequencies lower than 20 Hz. Although sounds of such low frequency are too low for humans to hear, whales, elephants and other animals can detect infrasound and use it to communicate. It can be used to detect volcanic eruptions and is used in some types of music.
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
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summarize: A single-tasking system can only run one program at a time, while a multi-tasking operating system allows more than one program to be running in concurrency. This is achieved by time-sharing, where the available processor time is divided between multiple processes. These processes are each interrupted repeatedly in time slices by a task-scheduling subsystem of the Single-user operating systems have no facilities to distinguish users, but may allow multiple programs to run in tandem. A multi-user operating system extends the basic concept of multi-tasking with facilities that identify processes and resources, such A distributed operating system manages a group of distinct, networked computers and In the distributed and cloud computing context of an OS, "templating" refers to creating a single virtual machine image as a Embedded operating systems are designed to be used in embedded computer systems. They are designed to operate on small machines with less autonomy A real-time operating system is an operating system that guarantees to process events or data by a specific moment in time. A real-time operating system may be single- A library operating system is one in which the services that a typical operating system provides, such as networking, are provided in Early computers were built to perform a series of single tasks, like a calculator. Basic operating system features were developed in the 1950s, such as resident monitor functions that could automatically run different programs in succession to speed up processing. Operating systems did not exist in their modern and more complex forms until the early 1960s. Hardware features were added, that enabled use of runtime libraries, interrupts, and parallel processing. When personal computers became popular in the 1980s, operating systems were made for them similar in concept to those used on larger computers. In the 1940s, the earliest electronic digital systems had no operating systems. Electronic systems of this time were programmed on rows of mechanical switches or by jumper wires on plugboards. These were special-purpose systems that, for example, generated ballistics tables for the military or controlled the printing of payroll checks from data on punched paper cards. After programmable general purpose computers were invented, machine languages(consisting of strings of the binary digits 0 and 1 on punched paper tape) were introduced that sped up the programming process (Stern, 1981). In the early 1950s, a computer could execute only one program at a time. Each user had sole use of the computer for a limited period and would arrive at a scheduled time with their program and data on punched paper cards or punched tape. The program would be loaded into the machine, and the machine would be set to work until the program completed or crashed. Programs could generally be debugged via a front panel using toggle switches and panel lights. It is said that Alan Turing was a master of this on the early Manchester Mark 1 machine, and he was already deriving the primitive conception of an operating system from the principles of the universal Turing machine. Later machines came with libraries of programs, which would be linked to a user's program to assist in operations such as input and output and compiling (generating machine code from human-readable symbolic code). This was the genesis of the modern-day operating system. However, machines still ran a single job at a time. At Cambridge University in England, the job queue was at one time a washing line (clothes line) from which tapes were hung with different colored clothes-pegs to indicate job priority. An improvement was the Atlas Supervisor. Introduced with the Manchester Atlas in 1962, it is considered by many to be the first recognisable modern operating system. Brinch Hansen described it as "the most significant breakthrough in the history of operating systems." Unix was originally written in assembly language. Ken Thompson wrote B, mainly based on BCPL, based on his experience in the MULTICS project. B was replaced by C, and Unix, rewritten in C, developed into a large, complex family of inter-related operating systems which have been influential in every modern operating system (see History). The "Unix-like" family is a diverse group of operating systems, with several major sub-categories including System V, BSD, and Linux. The name "UNIX" is a trademark of The Open Group which licenses it for use with any operating system that has been shown to conform to their definitions. "UNIX-like" is commonly used to refer to A subgroup of the Unix family is the Berkeley Software Distribution family, which includes FreeBSD, NetBSD, and OpenBSD. These operating systems are most commonly found on webservers, although they can also function as a personal computer OS. The Internet owes much of its existence to BSD, as many of the protocols now commonly used by computers to connect, send and receive data over a network were widely implemented and refined in BSD. The World Wide Web was also first demonstrated on a number of computers running an OS based on BSD called NeXTSTEP. In 1974, University of California, Berkeley installed its first Unix system. Over time, students and staff in the computer science department there began adding new programs macOS (formerly "Mac OS X" and later "OS X") is a line of open core graphical operating systems developed, marketed, and sold by Apple Inc., the latest of which is pre-loaded on all currently shipping Macintosh computers. macOS is the successor to the original classic Mac OS, which had been Apple's primary operating system since 1984. Unlike its predecessor, macOS is a UNIX operating system built on technology that had been developed at NeXT through the second half of the 1980s and up until Apple purchased the company in early 1997. The operating system was first released in 1999 The Linux kernel originated in 1991, as a project of Linus Torvalds, while a university student in Finland. He posted information about his project on a newsgroup for computer students and programmers, and received support and assistance from volunteers who succeeded in creating a complete and functional kernel. Linux is Unix-like, but was developed without any Unix code, unlike BSD and its variants. Because of its open license model, the Linux kernel code is available for study and modification, which resulted Microsoft Windows is a family of proprietary operating systems designed by Microsoft Corporation and primarily targeted to Intel architecture based computers, with an estimated 88.9 percent total usage share on Web connected computers. The latest version is Windows 10. In 2011, Windows 7 overtook Windows XP as most common version in use. Microsoft Windows was first released in 1985, as an operating environment running on top of MS-DOS, which was the standard operating system shipped on most Intel architecture personal computers at the time. In 1995, Windows 95 was released which only used MS-DOS as a bootstrap. There have been many operating systems that were significant in their day but are no longer so, such as AmigaOS; OS/2 from IBM and Microsoft; classic Mac OS, the non-Unix precursor to Apple's macOS; BeOS; XTS-300; RISC OS; MorphOS; Haiku; BareMetal and FreeMint. Some are still used in niche markets and continue to be developed as minority platforms for enthusiast communities and specialist applications. OpenVMS, formerly from DEC, is still under active development by Hewlett-Packard. The components of an operating system all exist in order to make the different parts of a computer work together. All user software needs to go through the operating system in order to use any of the hardware, whether it be as simple as a mouse or keyboard or as complex as an Internet component. With the aid of the firmware and device drivers, the kernel provides the most basic level of control over all of the computer's hardware devices. It manages memory access for programs in the RAM, it determines which programs get access to which hardware resources, it sets up or resets the CPU's operating states for optimal operation at all times, and it organizes the data for long-term non-volatile storage with file systems on such media as disks, tapes, flash memory, etc. The operating system provides an interface between an application program and the computer hardware, so that an application program can interact with the hardware only by obeying rules and procedures programmed into the operating system. The operating system is also a set Interrupts are central to operating systems, as they provide an efficient way for the operating system to interact with and react to its environment. The alternative having the operating system "watch" the various sources of input for events (polling) that require action can be found in older systems with very small stacks (50 or 60 bytes) but is unusual in modern systems with large stacks. Interrupt-based programming is directly supported by most modern CPUs. Interrupts provide a computer with a way of automatically saving local register contexts, and running specific code in response to events. Even very basic computers support hardware interrupts, and allow the programmer to specify code which may be run when that event takes place. When an interrupt is received, the computer's hardware automatically suspends whatever program is currently running, saves its status, and runs computer code Modern microprocessors (CPU or MPU) support multiple modes of operation. CPUs with this capability offer at least two modes: user mode and supervisor mode. In general terms, supervisor mode operation allows unrestricted access to all machine resources, including all MPU instructions. User mode operation sets limits on instruction use and typically disallows direct access to machine resources. CPUs might have other modes similar to user mode as well, such as the virtual modes in order to emulate older processor types, such as 16-bit processors on a 32-bit one, or 32-bit processors on a 64-bit one. At power-on or reset, the system begins in supervisor mode. Once an operating system kernel has been loaded and started, the boundary between user mode and supervisor mode (also known as kernel mode) can be established. Supervisor mode is used by the kernel for low level tasks that need unrestricted access Among other things, a multiprogramming operating system kernel must be responsible for managing all system memory which is currently in use by programs. This ensures that a program does not interfere with memory already in use by another program. Since programs time share, each program must have independent access to memory. Cooperative memory management, used by many early operating systems, assumes that all programs make voluntary use of the kernel's memory manager, and do not exceed their allocated memory. This system of memory management is almost never seen any more, since programs often contain bugs which can cause them to exceed their allocated memory. If a program fails, it may cause memory used by one or more other programs to be affected or overwritten. Malicious programs or viruses may purposefully alter another program's memory, or The use of virtual memory addressing (such as paging or segmentation) means that the kernel can choose what memory each program may use at any given time, allowing the operating system to use the same memory locations for multiple tasks. If a program tries to access memory that isn't in its current range of accessible memory, but nonetheless has been allocated to it, the kernel is interrupted in the same way as it would if the program were to exceed its allocated memory. (See section on memory management.) Under UNIX this kind of interrupt is Multitasking refers to the running of multiple independent computer programs on the same computer; giving the appearance that it is performing the tasks at the same time. Since most computers can do at most one or two things at one time, this is generally done via time-sharing, which means that each program uses a share of the computer's time to execute. An operating system kernel contains a scheduling program which determines how much time each process spends executing, and in which order execution control should be passed to programs. Control is passed to a process by the kernel, which allows the program access to the CPU and memory. Later, control is returned to the kernel through some mechanism, so that another program may be allowed to use the CPU. This so-called passing of control between the kernel and applications is called a context switch. An early model which governed the allocation of time to programs was called cooperative multitasking. In Access to data stored on disks is a central feature of all operating systems. Computers store data on disks using files, which are structured in specific ways in order to allow for faster access, higher reliability, and to make better use of the drive's available space. The specific way in which files are stored on a disk is called a file system, and enables files to have names and attributes. It also allows them to be stored in a hierarchy of directories or folders arranged in a directory tree. Early operating systems generally supported a single type of disk drive and only one kind of file system. Early file systems were A device driver is a specific type of computer software developed to allow interaction with hardware devices. Typically this constitutes an interface for communicating with the device, through the specific computer bus or communications subsystem that the hardware is connected to, providing commands to and/or receiving data from the device, and on the other end, the requisite interfaces to the operating system and software applications. It is a specialized hardware-dependent computer program which is also operating system specific that enables another program, typically an operating system or applications software package or computer program running under the operating system kernel, to interact transparently with a hardware device, and usually provides the requisite interrupt handling necessary for any necessary asynchronous time-dependent hardware interfacing needs. The key design goal of device drivers is abstraction. Every model of hardware Currently most operating systems support a variety of networking protocols, hardware, and applications for using them. This means that computers running dissimilar operating systems can participate in a common network for sharing resources such as computing, files, printers, and scanners using either wired or wireless connections. Networks can essentially allow a computer's operating system to access the resources of a remote computer to support the same functions as it could if those resources were connected directly to the local computer. This includes everything from simple communication, to using networked file systems or even sharing another computer's graphics or sound hardware. Some network services allow the resources of a computer to be accessed transparently, such as SSH which allows networked users A computer being secure depends on a number of technologies working properly. A modern operating system provides access to a number of resources, which are available to software running on the system, and to external devices like networks via the kernel. The operating system must be capable of distinguishing between requests which should be allowed to be processed, and others which should not be processed. While some systems may simply distinguish between "privileged" and "non-privileged", systems commonly have a form of requester "identity", such as a user name. To establish identity there may be a process of "authentication". Often a username must be quoted, and Every computer that is to be operated by an individual requires a user interface. The user interface is usually referred to as a shell and is essential if human interaction is to be supported. The user interface views the directory structure and requests services from the operating system that will acquire data from input hardware devices, such as a keyboard, mouse or credit card reader, and requests operating system services to display prompts, status messages and such on output hardware devices, such as a video monitor or printer. The two most common forms of a user interface have historically been the command-line interface, where computer commands are typed out line-by-line, and the graphical user interface, where a visual environment (most commonly a WIMP) is present. Most of the modern computer systems support graphical user interfaces (GUI), and often include them. In some computer systems, such as the original implementation of the classic Mac OS, the GUI is integrated into the kernel. While technically a graphical user interface is not an operating system service, incorporating support for one into the operating system kernel can allow the GUI to be more responsive by reducing the number of context switches required for the GUI to perform its output functions. Other operating systems are modular, separating the graphics subsystem from the kernel and the Operating System. In the 1980s UNIX, VMS and many others had operating systems that were built this way. Linux and macOS are also built this way. Modern releases of Microsoft Windows such as Windows Vista implement a graphics subsystem that is mostly in user-space; however the graphics drawing routines of A real-time operating system (RTOS) is an operating system intended for applications with fixed deadlines (real-time computing). Such applications include some small embedded systems, automobile engine controllers, industrial robots, spacecraft, industrial control, and some large-scale computing systems. An early example of a large-scale real-time operating system was Transaction Processing Facility developed by American Airlines and Operating system development is one of the most complicated activities in which a computing hobbyist may engage. A hobby operating system may be classified as one whose code has not been directly derived from an existing operating system, and has few users and active developers. In some cases, hobby development is in support Application software is generally written for use on a specific operating system, and sometimes even for specific hardware. When porting the application to run on another OS, the functionality required by that application may be implemented differently by that OS (the names of functions, meaning of arguments, etc.) requiring the application to be adapted, changed, or otherwise maintained. Unix was the first operating system not written in assembly language, making it very portable to systems different from its native PDP-11. This cost in supporting operating systems diversity can be avoided by instead writing applications against software platforms such as Java or Qt. These abstractions have already borne the cost of adaptation to specific operating systems and their system libraries. Another approach is for operating system vendors to adopt standards. For example, POSIX and OS abstraction layers provide commonalities that reduce porting costs.
An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs.
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summarize: Němec was influenced by the early films of Luis Buñuel and Robert Bresson's A Man Escaped and novels of William Faulkner. Němec cast a Roma railway worker Antonín Kumbera after seeing him in a documentary "Železničáři" by Evald Schorm. The other lead Ladislav Jánský was a photographer and occasional actor. In the middle of shooting cinematographer Jaroslav Kučera was invited to the film festival in South America and left. The rest of the movies was finished by Miroslav Ondříček. The opening tracking shot was the longest in the Czechoslovak cinema's history. It cost a third of the film's budget. "Diamonds of the Night" begins with two teenage boys fleeing from a train and shedding, as they run, long black coats, on the backs of which are painted in white the letters "KL," the abbreviation for "Konzentrationslager" (concentration camp). Behind them are the sounds of shouting and shooting. The film employs little dialogue, and the boys' escape through forests and swamps and across rocky terrain is interpolated with the dreams, memories, hallucinations, fantasies, and flashbacks of the younger of the two boys. In one sequence, the younger boy recalls exchanging his shoes with the older boy for a piece of food; in another, he seems to imagine returning to the apartment in Prague where he used to live; and in a third, he rides a Prague tram with shot-out windows while wearing once again the coat that identifies him as a concentration camp escapee. When the boys encounter a farmer's wife, the younger boy follows her into her kitchen to ask for food, and as he struggles with thoughts of murder and rape, the film repeatedly shows both possibilities. In the end, the boy silently takes a few slices of bread from her and leaves. Eventually, the boys are caught by a shooting party of elderly German-speaking men, who detain the boys in a beer hall while they drink, eat, sing, and dance, before turning the boys over to the mayor. As the boys are marched out, the leader of the shooting party calls out, "Ready, aim, fire," but the men merely laugh. The ending is ambiguous: either the boys have been spared, or they are walking to their execution. "Diamonds of the Night" holds an 90% approval rating on Rotten Tomatoes, with Eric Hynes of "Time Out" writing, "Němec’s technique is as emotionally intuitive as it is masterful, purposefully scrambling past and present, handheld realism (a breathless opening tracking shot) and Buñuellian surrealism (fever-dreamed ants colonizing Jánský’s angelic face). It’s a torrent of life—and cinema—in the face of death."
Diamonds of the Night () is a 1964 Czech film about two boys on the run from a train taking them to a concentration camp, based loosely on Arnošt Lustig's autobiographical novel "Darkness Has No Shadow". It was director Jan Němec's first full-length feature film.
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summarize: The English word "sun" developed from Old English "sunne". Cognates appear in other Germanic languages, including West Frisian "sinne", Dutch "zon", Low German "Sünn", Standard German "Sonne", Bavarian "Sunna", Old Norse "sunna" and Gothic "sunnō". All these words stem from Proto-Germanic *sunnōn. This is ultimately related to the word for "sun" in other branches of the Indo-European language family, though in most cases a nominative stem with an "l" is found, rather than the genitive stem in "n", as for example in Latin "sōl", Greek ἥλιος "hēlios", Welsh "haul" and Russian солнце "solntse" (pronounced "sontse"), as well as (with *l > "r") Sanskrit स्वर "svár" and Persian خور "xvar". Indeed, the "l"-stem survived in Proto-Germanic as well, as *sōwelan, which gave rise The Sun is a G-type main-sequence star that comprises about 99.86% of the mass of the Solar System. The Sun has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs. The Sun is a Population I, or heavy-element-rich, star. The formation of the Sun may have been triggered by shockwaves from one or more nearby supernovae. This is suggested by a high abundance of heavy elements in the Solar System, such as gold and uranium, relative to the abundances of these elements in so-called Population II, heavy-element-poor, stars. The heavy elements could most plausibly have been produced by endothermic nuclear reactions during a supernova, or by transmutation through neutron absorption within a massive second-generation star. The Sun is by far the brightest object in the Earth's sky, with an apparent magnitude of −26.74. This is about 13 billion times brighter than the next brightest star, Sirius, which has an apparent magnitude of −1.46. is defined The solar constant is the amount of power that the Sun deposits per unit area that is directly exposed to sunlight. The solar constant is equal to approximately (watts per square meter) at a distance of one astronomical unit (AU) from the Sun (that is, on or near Earth). Sunlight on the surface of Earth is attenuated by Earth's atmosphere, so that less power arrives at the surface (closer to ) in clear conditions when the Sun is near the zenith. Sunlight at the top of Earth's atmosphere is composed (by total energy) of about 50% infrared light, 40% visible light, and 10% ultraviolet light. The atmosphere in particular filters out over 70% of solar ultraviolet, especially at The Sun is composed primarily of the chemical elements hydrogen and helium. At this time in the Sun's life, they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called "metals" in astronomy, account for less than 2% of the mass, with oxygen (roughly 1% of the Sun's mass), carbon (0.3%), neon (0.2%), and iron (0.2%) being the most abundant. The Sun's original chemical composition was inherited from the interstellar medium out of which it formed. Originally it would have contained about 71.1% hydrogen, 27.4% helium, and 1.5% heavier elements. The hydrogen and most of the helium in the Sun would have been produced by Big Bang nucleosynthesis in the first 20 minutes of the universe, and the heavier elements were produced by previous generations of stars before the Sun was formed, and spread into the interstellar medium during the final stages of stellar life and by events such as supernovae. Since the Sun formed, the main fusion process has involved fusing hydrogen into helium. Over the past 4.6 billion years, the amount of helium and its location within the Sun has gradually changed. Within the core, the proportion of helium has increased from about 24% to about 60% due to fusion, and some of the helium and heavy elements have settled from the photosphere towards the center of the Sun because of gravity. The proportions of metals (heavier elements) is unchanged. Heat is transferred outward from the Sun's core by radiation rather than by convection (see Radiative zone below), so the fusion products are not lifted outward by heat; they remain in the core and gradually an inner core of helium has begun to form that cannot be fused because presently the Sun's core is not hot or dense enough to fuse helium. In the current photosphere the helium fraction is reduced, and the metallicity is only 84% of what it was in the protostellar phase (before nuclear fusion in the core started). In the future, helium will continue to accumulate in the core, and in about 5 billion years this gradual build-up will eventually cause the Sun to exit the main sequence and become a red giant. The chemical composition of the photosphere is normally considered representative of the composition of the primordial Solar System. The solar heavy-element abundances described above are typically measured both using spectroscopy of the Sun's photosphere and by measuring abundances in meteorites that have never been heated to melting temperatures. These meteorites are thought to retain the composition of the protostellar Sun and are thus not affected by settling of heavy elements. The two methods generally agree well. The structure of the Sun contains the following layers: The core of the Sun extends from the center to about 20–25% of the solar radius. It has a density of up to (about 150 times the density of water) and a temperature of close to 15.7 million kelvin (K). By contrast, the Sun's surface temperature is approximately. Recent analysis of SOHO mission data favors a faster rotation rate in the core than in the radiative zone above. Through most of the Sun's life, energy has been produced by nuclear fusion in the core region through a series of nuclear reactions called the p–p (proton–proton) chain; this process converts hydrogen into helium. Only 0.8% of the energy generated in the Sun comes from another sequence of fusion reactions called the CNO cycle, though this proportion is expected to increase as the Sun becomes older. The core is the only region in the Sun that produces an appreciable amount of thermal energy through fusion; 99% of the power is generated within 24% of the Sun's radius, and by 30% of the radius, fusion has stopped nearly entirely. The remainder of the Sun is heated by this energy as From the core out to about 0.7 solar radii, thermal radiation is the primary means of energy transfer. The temperature drops from approximately 7 million to 2 million kelvins with increasing distance from the core. This temperature gradient is less than the value of the adiabatic The radiative zone and the convective zone are separated by a transition layer, the tachocline. This is a region where the sharp regime change between the uniform rotation of the The Sun's convection zone extends from 0.7 solar radii (500,000 km) to near the surface. In this layer, the solar plasma is not dense enough or hot enough to transfer the heat energy of the interior outward via radiation. Instead, the density of the plasma is low enough to allow convective currents to develop and move the Sun's energy outward towards its surface. Material heated at the tachocline picks up heat and expands, thereby reducing its density and allowing it to rise. As a result, an orderly motion of the mass develops into thermal cells that carry the majority The visible surface of the Sun, the photosphere, is the layer below which the Sun becomes opaque to visible light. Photons produced in this layer escape the Sun through the transparent solar atmosphere above it and become solar radiation, sunlight. The change in opacity is due to the decreasing amount of H ions, which absorb visible light easily. Conversely, the visible light we see is produced as electrons react with hydrogen atoms to produce H ions. The photosphere is tens to hundreds of kilometers thick, and is slightly less opaque than air on Earth. Because the upper part of the photosphere is cooler than the lower During a total solar eclipse, when the disk of the Sun is covered by that of the Moon, parts of the Sun's surrounding atmosphere can be seen. It is composed of four distinct parts: the chromosphere, the transition region, the corona and the heliosphere. The coolest layer of the Sun is a temperature minimum region extending to about above the photosphere, and has a temperature of about. This part of the Sun is cool enough to allow the existence of simple molecules such as carbon monoxide and water, which can be detected via their absorption High-energy gamma ray photons initially released with fusion reactions in the core are almost immediately absorbed by the solar plasma of the radiative zone, usually after traveling only a few millimeters. Re-emission happens in a random direction and usually at a slightly lower energy. With this sequence of emissions and absorptions, it takes a long time for radiation to reach the Sun's surface. Estimates of the photon travel time range between 10,000 and 170,000 years. In contrast, it takes only 2.3 seconds for the neutrinos, which account for about 2% of the total energy production of the Sun, to reach the surface. Because energy The Sun has a magnetic field that varies across the surface of the Sun. Its polar field is, whereas the field is typically in features on the Sun called sunspots and in solar prominences. The magnetic field also varies in time and location. The quasi-periodic 11-year solar cycle is the most prominent variation in which the number and size of sunspots waxes and wanes. Sunspots are visible as dark patches on the Sun's photosphere, and correspond to concentrations of magnetic field where the convective transport of heat is inhibited from the solar interior to The Sun's magnetic field leads to many effects that are collectively called solar activity. Solar flares and coronal-mass ejections tend to occur at sunspot groups. Slowly changing high-speed streams of solar wind are emitted from coronal holes at the photospheric surface. Both coronal-mass ejections and high-speed streams of solar wind carry plasma and interplanetary magnetic field outward into the Solar System. The effects of solar activity on Earth include auroras at moderate to high Long-term secular change in sunspot number is thought, by some scientists, to be correlated with long-term change in solar irradiance, which, in turn, might influence Earth's long-term climate. For example, in the 17th century, the solar cycle appeared to have stopped entirely for several decades; few sunspots were observed during a period known as The Sun today is roughly halfway through the most stable part of its life. It has not changed dramatically for over four billion years, and will remain fairly stable for more than five billion more. However, after hydrogen fusion in its core has stopped, the Sun will undergo dramatic changes, both internally and externally. The Sun formed about 4.6 billion years ago from the collapse of part of a giant molecular cloud that consisted mostly of hydrogen and helium and that probably gave birth to many other stars. This age is estimated using computer models of stellar evolution and through nucleocosmochronology. The result is consistent with the radiometric date of the oldest Solar System material, at 4.567 billion years ago. Studies of ancient meteorites reveal traces of stable daughter nuclei of short-lived isotopes, such as iron-60, that form only in exploding, short-lived stars. This indicates that one or more The Sun is about halfway through its main-sequence stage, during which nuclear fusion reactions in its core fuse hydrogen into helium. Each second, more than four million tonnes of matter are converted into energy within the Sun's core, producing neutrinos and solar radiation. At this rate, the Sun has so far converted around 100 times the mass of Earth into energy, about 0.03% of the total mass of the Sun. The Sun will spend a total of approximately 10 billion years as a The Sun does not have enough mass to explode as a supernova. Instead it will exit the main sequence in approximately 5 billion years and start to turn into a red giant. As a red giant, the Sun will grow so large that it will engulf Mercury, Venus, and probably Earth. Even before it becomes a red giant, the luminosity of the Sun will have nearly doubled, and Earth will receive as much sunlight as Venus receives today. Once the core hydrogen is exhausted in 5.4 billion years, the Sun will expand into a subgiant phase and slowly double in size over about The Sun lies close to the inner rim of the Milky Way's Orion Arm, in the Local Interstellar Cloud or the Gould Belt, at a distance of from the Galactic Center. The Sun is contained within the Local Bubble, a space of rarefied hot gas, possibly produced by the supernova remnant Geminga, or multiple supernovae in subgroup B1 of the Pleiades moving group. The distance between the local arm and the next arm out, the Perseus Arm, is about 6,500 light-years. The Sun, and thus the Solar System, is found in what scientists call the galactic habitable zone. The "Apex of the Sun's Way", or the solar apex, is the direction that the Sun travels relative to other nearby stars. This motion is towards a point in the constellation Hercules, near the star Vega. Within of the Sun there are 315 known stars in 227 systems, as of 2000, including 163 single stars. It is estimated that a further 130 systems within this range have not yet been identified. Out to, there may be up to 7,500 stars, of which around 2,600 are known. The number of substellar objects in that volume are expected to be comparable to the number of stars. Of the 50 nearest stellar systems within 17 light-years from Earth (the closest being the red dwarf Proxima Centauri at approximately 4.2 light-years), the Sun ranks fourth in mass. The Sun orbits the center of the Milky Way, and it is presently moving in the direction of the constellation of Cygnus. A simple model of the motion of a star in the galaxy gives the galactic coordinates,, and as: where,, and are the respective velocities with respect to the local standard of rest, and are the Oort constants, formula_4 is the angular velocity of galactic rotation for the local standard of rest, formula_5 is the "epicyclic frequency", and ν is the vertical The Sun is moved by the gravitational pull of the planets. One can think of the barycentre of the Solar System as being stationary (or as moving in a steady motion around the galaxy). The centre of the sun is always within 2.2 solar radii of the barycentre. This motion of the Sun is mainly due to Jupiter, Saturn, Uranus, and Neptune. For The temperature of the photosphere is approximately 6,000 K, whereas the temperature of the corona reaches. The high temperature of the corona shows that it is heated by something other than direct heat conduction from the photosphere. It is thought that the energy necessary to heat the corona is provided by turbulent motion in the convection zone below the photosphere, and two main mechanisms have been proposed to explain coronal heating. The first is wave heating, in Theoretical models of the Sun's development suggest that 3.8 to 2.5 billion years ago, during the Archean eon, the Sun was only about 75% as bright as it is today. Such a weak star would not have been able to sustain liquid water on Earth's surface, and thus life should not have been able to develop. However, the geological record demonstrates that Earth has remained at a fairly constant temperature throughout its history, and that The enormous effect of the Sun on Earth has been recognized since prehistoric times, and the Sun has been regarded by some cultures as a solar deity. The Sun has been an object of veneration in many cultures throughout human history. Humanity's most fundamental understanding of the Sun is as the luminous disk in the[sky, whose presence above the horizon creates day and whose absence causes night. In many prehistoric and ancient cultures, the Sun was thought to be a solar deity or other supernatural entity. Worship of the Sun was central to civilizations such as the ancient Egyptians, the Inca of South America and the Aztecs of what is now Mexico. In religions such as Hinduism, the Sun is still considered a god. Many ancient monuments were constructed with solar phenomena in mind; for example, stone megaliths accurately mark the summer or winter solstice (some of the In the early first millennium BC, Babylonian astronomers observed that the Sun's motion along the ecliptic is not uniform, though they did not know why; it is today known that this is due to the movement of Earth in an elliptic orbit around the Sun, with Earth moving faster when it is nearer to the Sun at perihelion and moving slower when it is farther away at aphelion. One of the first people to offer a scientific or philosophical explanation for the Sun was the Greek philosopher Anaxagoras. He reasoned that it was not the chariot of Helios, but instead a giant flaming ball of metal even larger than the land of the Peloponnesus and that the Moon reflected the light of the Sun. For teaching this heresy, he was imprisoned by the authorities and The first satellites designed for long term observation of the Sun from interplanetary space were NASA's Pioneers 6, 7, 8 and 9, which were launched between 1959 and 1968. These probes orbited the Sun at a distance similar to that of Earth, and made the first detailed measurements of the solar wind and the solar magnetic field. Pioneer 9 operated for a particularly long time, transmitting data until May 1983. In the 1970s, two Helios spacecraft and the Skylab Apollo Telescope Mount provided scientists with significant new data on solar wind and the solar corona. The Helios 1 and 2 probes were U.S.–German collaborations that studied the solar wind from an orbit carrying the spacecraft inside Mercury's orbit at perihelion. The Skylab space station, launched The brightness of the Sun can cause pain from looking at it with the naked eye; however, doing so for brief periods is not hazardous for normal non-dilated eyes. Looking directly at the Sun causes phosphene visual artifacts and temporary partial blindness. It also delivers about 4 milliwatts of sunlight to the retina, slightly heating it and potentially causing damage in eyes that cannot respond properly to the brightness. UV exposure gradually yellows the lens of the eye over a period of years, and is thought to contribute to the formation of cataracts, but this depends on general exposure to solar UV, and not whether one looks directly at the Sun. Long-duration viewing of the direct Sun with the naked eye can begin to cause UV-induced, sunburn-like lesions on the retina after about 100 seconds, particularly under conditions where the UV light from the Sun is intense and well focused; conditions are worsened by young eyes or new lens implants (which admit more UV than aging natural eyes), Sun angles near the zenith, and observing locations at high altitude. Viewing the Sun through light-concentrating optics such as binoculars may result in permanent damage to the retina without an appropriate filter that blocks UV and substantially dims the sunlight. When using an attenuating filter to view the Sun, the viewer is cautioned to use a filter specifically designed for that use. Some improvised filters that pass UV or IR rays, can actually harm the eye at high brightness levels. Herschel wedges, also called Solar Diagonals, are effective and inexpensive for small telescopes. The sunlight that is destined for the eyepiece is reflected from an unsilvered surface of a piece of glass. Only a very small fraction of the incident light is reflected. The rest passes through the glass and leaves the instrument. If the glass breaks because of The Sun has eight known planets. This includes four terrestrial planets (Mercury, Venus, Earth, and Mars), two gas giants (Jupiter and Saturn), and Solar deities play a major role in many world religions and mythologies. The ancient Sumerians believed that the sun was Utu, the god of justice and twin brother of Inanna, the Queen of Heaven, who was identified as the planet Venus. Later, Utu was identified with the East Semitic god Shamash. Utu was regarded as a helper-deity, who aided those in distress, and, in iconography, he is usually portrayed with a long beard and clutching a saw, which represented his role as the dispenser of justice. From at least the Fourth Dynasty of Ancient Egypt, the Sun was worshipped as the god Ra, portrayed as a falcon-headed divinity surmounted by the solar disk, and surrounded by a serpent. In the New Empire period, the Sun became identified with the dung beetle, whose spherical ball of dung was identified with the Sun. In the form of the sun disc Aten, the Sun had a brief resurgence during the Amarna Period when it again became the preeminent, if not only, divinity for the Pharaoh Akhenaton. In Proto-Indo-European religion, the Sun was personified as the goddess "*Sehul". Derivatives of this goddess in Indo-European languages include the Old Norse "Sól", Sanskrit "Surya", Gaulish "Sulis", Lithuanian "Saulė", and Slavic "Solntse". In ancient Greek religion, the sun deity was the male god Helios, but traces of an earlier female solar deity are preserved in Helen of Troy. In later times, Helios was syncretized with Apollo. In the Bible, mentions the "Sun of Righteousness" (sometimes translated as the "Sun of Justice"), which some Christians have interpreted as a reference to the Messiah (Christ). In ancient Roman culture, Sunday was the day of the sun god. It was adopted as the Sabbath day by Christians who did not have a Jewish background. The symbol of light was a pagan device adopted by Christians, and perhaps the most important one that did not come from Jewish traditions. In paganism, the Sun was a source of life, giving warmth and illumination to mankind. It was the center of a popular cult among Romans, who would stand at dawn to catch the first rays of sunshine as they prayed. The celebration of the winter solstice (which influenced Christmas) was part of the Roman cult of the unconquered Sun (Sol Invictus). Christian churches were built with an orientation so that the congregation faced toward the sunrise in the East. Tonatiuh, the Aztec god of the sun, was usually depicted holding arrows and a shield and was closely associated with the practice of human sacrifice. The sun goddess Amaterasu is the most important deity in the Shinto religion, and she is believed to be the direct ancestor of all Japanese emperors.
The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process.<ref name="doi10.1146/annurev-astro-081913-040012"> It is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometers (864,000 miles), or 109 times that of Earth, and its mass is about 330,000 times that of Earth. It accounts for about 99.86% of the total mass of the Solar System. Roughly three quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.
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summarize: Emil, a fastidious and orderly older man, carries his happy new bride, Eva, over the threshold of their home. He has great difficulty opening the lock on the front door, trying key after key. She is greatly disappointed on their wedding night because he does not even come to bed. He has pinched his finger in the clasp of Eva's pearls when he attempts to remove them. He is unable to consummate their marriage due to the minor injury on his finger. Emil continues to ignore Eva for many days often retreating behind his newspaper. Eva refuses to live in a loveless marriage. She can no longer bear to be Emil's wife in name only and returns to the estate of her father, a wealthy horse breeder. Eva seeks and is granted a divorce from Emil. One day, Eva goes horseback riding in the countryside surrounding her father's estate. She has a swim in the nude, leaving her clothes on her horse which wanders off to find a stallion locked in a nearby corral. Eva, still completely naked, chases after her horse. Adam, a virile, young engineer working in road construction in that area happens to look up and see Eva trying to catch her horse. Finally, Adam is able to catch the runaway horse. Eva is so embarrassed that she hides in the bushes when Adam approaches her. At first, Eva is ashamed of her nudity, but then she glares up at him in defiance. He hands Eva her clothes. When she tries to leave, she hurts her ankle. At first, she resists Adam's efforts to help, then acquiesces. That night, Eva is restless and cannot stop thinking about Adam. Finally, she goes to his isolated residence which is located near the field where they met. After some hesitation, they embrace and spend the night together. In the throes of passion, Eva's pearl necklace is broken and falls to the floor. She forgets to take it with her the next morning. But the young lovers promise to meet in town at the local hotel the following evening. When Eva returns home the next morning, she finds an unwelcome visitor. Her ex-husband, Emil, has been waiting for her all night. He wants to reconcile with her, but she tells him that it is too late. Brokenhearted, he leaves. By chance, while driving away, Emil encounters Adam on the road. Adam helps to guide Emil through the construction. Then Adam asks Emil for a ride into town. Emil agrees. They stop at Adam's residence in order to pack his suitcase. While packing, Adam notices Eva's pearls on the floor. He takes them along intending to return them to her. While traveling to town, Emil notices Adam admiring the pearl necklace. Emil instantly recognizes the distinctive pearl necklace as those belonging to his ex-wife. Immediately, Emil becomes jealous and enraged. Adam has no idea that Emil had been married to Eva. In his anger, Emil considers driving into an approaching train at a crossing, but at the last moment thinks better of it. That night, Emil sits alone in a hotel room while a fly tries futilely to get out through a closed window and several others are shown trapped in flypaper. Meanwhile, downstairs, Adam is arranging flowers as he waits in the hotel restaurant for his lover, Eva, to arrive. The young lovers are very happy to be reunited. While they are drinking champagne and dancing, they suddenly hear a gunshot. Emil has shot himself. Everyone in the hotel runs to the door of Emil's room. Adam still does not know of the connection between Emil and Eva. She is deeply saddened by the suicide of Emil. However, she does not divulge her relationship with Emil to anyone including Adam. The young couple were to take the train to Berlin later that evening and begin their new life together. While waiting at the train station, Adam falls asleep. A distraught Eva slips quietly away while Adam sleeps. She leaves on a different train without Adam because of the guilt that she feels over the suicide of her former husband, Emil. When Adam awakens, he realizes that Eva has left him without a word. Later, he returns to his work in construction and daydreams of Eva. Adam imagines Eva happily holding his baby. "Ecstasy" was filmed in the summer of 1932, with a German language script that contained only five pages. The original prepared script (two previous versions were canceled) was in Czech, so Lamarr was useful in translating from German to French. After the shooting at Barrandov Terraces in Prague and a pond in Jevany, the crew moved to Dobšiná, Slovakia to shoot the rest of the outdoor scenes on 5 July 1932. It was not until August that shooting really started, mostly because of disputes about the French version and French actors. From Dobšiná, short shooting trips of one or two days were made to other places: Topoľčianky (scenes with horses), Khust, Carpathian Ruthenia, and railroad construction Červená skala – Margecany. The film was not finished in time, and "A-B ateliery" in Prague were already booked out in September, and therefore, some indoor scenes were filmed in the Atelier Schönbrunn studios in Vienna, Austria, in 6 days, which was also commercially useful, because the producer did not have to pay the import (contingency) fee when showing the film in Austria. By that time the distribution rights were already sold in Germany, Austria, Hungary, Switzerland, Belgium, France, Argentina, Brazil, Colombia and other countries. The world premiere of the film took place on 20 January 1933 in Prague, Czechoslovakia. In Austria, the film was released on 14 February 1933. Due to censorship problems, German cinemas did not show it until 8 January 1935, with the title "Symphonie der Liebe" ("Symphony of Love"). "Ecstasy" was controversial in some countries because of the scenes in which Lamarr is running and swimming naked, and the orgasm scene. Lamarr later claimed in interviews she was tricked into the nude scenes by the director and there was no mention of the nude scenes in the script. After a Vatican journalist attended screening at Venice Film Festival, Pope Pius XI denounced the film in the Vatican newspaper. As a result, none of the Italian distributors bought the rights for distribution. In Germany, the film was banned and only released in 1935 with edited scenes. In the United States, the Catholic Legion of Decency found the film morally objectionable. It condemned the film in 1933, making "Ecstasy" one of the first foreign films condemned by the Legion. Beginning in 1936, the US distributor of "Ecstasy" lobbied the Hays office for ten months to get the film the Hays Code seal of approval which would allow it a wide American release. Joseph Breen called the picture "highly—even dangerously—indecent" in an inter-office memo to Will H. Hays, and told the producers: Curiously enough, it was Breen who later hired Machatý at RKO in 1940. "Ecstasy" was not released in the United States until 1935. It went on to limited run in America without the Hays seal, where it played in mostly independent art houses. Some state censor boards such as New York approved the film but most others either only allowed it with restrictions, demanded substantial cuts, or in the case of Pennsylvania, banned it altogether. Lamarr's first husband, the wealthy arms dealer Friedrich Mandl, reportedly spent $280,000 ($ in dollars) in an unsuccessful attempt to suppress the film by purchasing every existing print. Austrian and Czech versions of the film were very similar. Only the scenes with supporting actors differed. The roles of Eva, Adam and Eva's father were overdubbed by Czech actors for the Czech version. Zvonimir Rogoz replayed all of his dialog in Czech. The French version featured actors André Nox as Eva's father and Pierre Nay as Adam. Machatý anticipated problems with censors, so he shot multiple alternative scenes, that could be edited in the movie. The original versions were screened in Czechoslovkia, Austria and Venice Film Festival. In Germany censors allowed the film only after some of the naked shots were removed and two additional scenes were added. One scene making it clear Eva was already divorced when she met Adam and a more traditional ending where Eva and Adam stay together. This version was the basis for the US distribution version. The US version also added songs by Denes Agay and Emery H. Helm with lyrics by Henry Gershwin and William Colligan.
Ecstasy (,, ) is a 1933 Czech erotic romantic drama film directed by Gustav Machatý and starring Hedy Lamarr (then Hedy Kiesler), Aribert Mog, and Zvonimir Rogoz.
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summarize: The name Occitan comes from "lenga d'òc" ("language of òc"), "òc" being the Occitan word for "yes." While the term would have been in use orally for some time after the decline of Latin, as far as historical records show, the Italian medieval poet Dante was the first to have recorded the term "lingua d'oc" in writing. In his "De vulgari eloquentia", he wrote in Latin, ""nam alii oc, alii si, alii vero dicunt oil"" ("for some say "òc", others "sì", yet others say "oïl""), thereby highlighting three major Romance literary languages that were well known in Italy, based on each language's word for "yes", the "òc language" (Occitan), the "oïl language" (French), and the "sì language" (Sicilian and Italian). This was not, of course, the only defining characteristic of each group. The word "òc" came from Vulgar Latin "hoc" ("this"), while "oïl" originated from Latin "hoc illud" ("this [is] it"). Old Catalan, and now the Catalan of Northern Catalonia also have "hoc" ("òc"). Other Romance languages derive their word for "yes" from the Latin "sic," "thus [it is], [it was done], etc.", such as Spanish "sí", Eastern Lombard "sé", Sicilian and Italian "sì", or Portuguese "sim". In Modern Catalan, as in modern Spanish, "sí" is usually used as a response, although the language retains the word "oi", akin to "òc", which is sometimes used at the end of yes–no questions, and also in higher register as a positive response. French uses "si" to answer "yes" in response to questions that are asked in the negative sense: e.g., ""Vous n'avez pas de frères?"" ""Si, j'en ai sept."" ("You have no brothers?" "But yes, I have seven."). The name "Occitan" was attested around 1300 as "occitanus", a crossing of "oc" and "aquitanus" (Aquitanian). For many centuries, the Occitan dialects (together with Catalan) were referred to as "Limousin" or "Provençal", after the names of two regions lying within the modern Occitan-speaking area. After Frédéric Mistral's Félibrige movement in the 19th century, Provençal achieved the greatest literary recognition and so became the most popular term for Occitan. According to Joseph Anglade, a philologist and specialist of medieval literature who helped impose the then archaic term "Occitan" as the sole correct name, the word "Lemosin" was first used to designate the language at the beginning of the 13th century by Catalan troubadour Raimon Vidal de Besalú(n) in his "Razós de trobar": "La parladura Francesca val mais et [es] plus avinenz a far romanz e pasturellas; mas cella de Lemozin val mais per far vers et cansons et serventés; et per totas las terras de nostre lengage son de major autoritat li cantar de la lenga Lemosina que de negun'autra parladura, per qu'ieu vos en parlarai primeramen." The French language is worthier and better suited for romances and pastourelles; but that (language) from Limousin is of greater value for writing poems and cançons and sirventés; and across the whole of the lands where our tongue is spoken, the literature in the Limousin language has more authority than any other dialect, wherefore I shall use this name in priority. As for the word "Provençal", it should not be taken as strictly meaning the language of Provence, but of Occitania as a whole, for "in the eleventh, the twelfth, and sometimes also the thirteenth centuries, one would understand under the name of Provence the whole territory of the old Provincia romana Gallia Narbonensis and even Aquitaine". The term first came into fashion in Italy. Currently, linguists use the terms "Provençal" and "Limousin" strictly to refer to specific varieties within Occitania, keeping the name "Occitan" for the language as a whole. Many non-specialists, however, continue to refer to the language as Provençal, causing some confusion. One of the oldest written fragments of the language found dates back to 960, in an official text that was mixed with Latin:De ista hora in antea non DECEBRÀ Ermengaus filius Eldiarda Froterio episcopo filio Girberga NE Raimundo filio Bernardo vicecomite de castello de Cornone... NO·L LI TOLRÀ NO·L LI DEVEDARÀ NI NO L'EN DECEBRÀ... nec societatem non AURÀ, si per castellum recuperare NON O FA, et si recuperare potuerit in potestate Froterio et Raimundo LO TORNARÀ, per ipsas horas quæ Froterius et Raimundus L'EN COMONRÀ." Carolingian litanies (c. 780), both written and sung in Latin, were answered to in Old Occitan by the audience ("Ora pro nos"; "Tu lo juva"). Other famous pieces include the "Boecis", a 258-line-long poem written entirely in the Limousin dialect of Occitan between the year 1000 and 1030 and inspired by Boethius's "The Consolation of Philosophy"; the Waldensian "La nobla leyczon" (dated 1100), "la Cançó de Santa Fe" (c. 1054–1076), the "Romance of Flamenca" (13th century), the "Song of the Albigensian Crusade" (1213–1219?), "Daurel e Betó" (12th or 13th century), "Las, qu'i non-sun sparvir, astur" (11th century) and "Tomida femina" (9th or 10th century). Occitan was the vehicle for the influential poetry of the medieval troubadours ("trovadores") and "trobairitz": At that time, the language was understood and celebrated throughout most of educated Europe. It was the maternal language of the English queen Eleanor of Aquitaine and kings Richard I of England (who wrote troubadour poetry) and John, King of England. With the gradual imposition of French royal power over its territory, Occitan declined in status from the 14th century on. By the Ordinance of Villers-Cotterêts (1539) it was decreed that the "langue d'oïl" (French – though at the time referring to the Francien language and not the larger collection of dialects grouped under the name Langues d'oïl) should be used for all French administration. Occitan's greatest decline was during the French Revolution, during which diversity of language was considered a threat. In 1903 the four Gospels Lis Evangèli i.e. Matthew, Mark, Luke and John were translated into the form of Provençal spoken in Cannes and Grasse. This was given the official Roman Catholic Imprimatur by A. Estellon, vicar general. The literary renaissance of the late 19th century (which included a Nobel Prize for Frédéric Mistral) was attenuated by World War I, when Occitan speakers spent extended periods of time alongside French-speaking comrades. Because the geographical territory in which Occitan is spoken is surrounded by regions in which other Romance languages are used, external influences could have influenced its origin and development. Many factors favoured its development as a language of its own. Catalan in Spain's northern and central Mediterranean coastal regions and the Balearic Islands is closely related to Occitan, sharing many linguistic features and a common origin (see Occitano-Romance languages). The language was one of the first to gain prestige as a medium for literature among Romance languages in the Middle Ages. Indeed, in the 12th and 13th centuries, Catalan troubadours such as Guerau de Cabrera, Guilhem de Bergadan, Guilhem de Cabestany, Huguet de Mataplana, Raimon Vidal de Besalú, Cerverí de Girona, Formit de Perpinhan, and Jofre de Foixà wrote in Occitan. At the end of the 11th century, the "Franks", as they were called at the time, started to penetrate the Iberian Peninsula through the Ways of St. James via Somport and Roncesvalles, settling on various spots of the Kingdoms of Navarre and Aragon enticed by the privileges granted them by the Navarrese kings. They established themselves in ethnic boroughs where Occitan was used for everyday life, e.g. Pamplona, Sangüesa, Estella-Lizarra, etc. The language in turn became the status language chosen by the Navarrese kings, nobility, and upper classes for official and trade purposes in the period stretching from the early 13th century to late 14th century. These boroughs in Navarre may have been close-knit communities with little mingling, in a context where the natural milieu was predominantly Basque-speaking. The variant chosen for written administrative records was a "koiné" based on the Languedocien dialect from Toulouse with fairly archaic linguistic features. Evidence of a written account in Occitan from Pamplona revolving around the burning of borough San Nicolas from 1258 survives today, while the "History of the War of Navarre" by Guilhem Anelier (1276) albeit written in Pamplona shows a linguistic variant from Toulouse. Things turned out slightly otherwise in Aragon, where the sociolinguistic situation was different, with a clearer Basque-Romance bilingual situation (cf. Basques from the Val d'Aran cited c. 1000), but a receding Basque language (Basque banned in the marketplace of Huesca, 1349). While the language was chosen as a medium of prestige in records and official statements along with Latin in the early 13th century, Occitan faced competition from the rising local Romance vernacular, the Navarro-Aragonese, both orally and in writing, especially after Aragon's territorial conquests south to Zaragoza, Huesca and Tudela between 1118 and 1134. It resulted that a second Occitan immigration of this period was assimilated by the similar Navarro-Aragonese language, which at the same time was fostered and chosen by the kings of Aragon. The language fell into decay in the 14th century across the whole southern Pyrenean area and became largely absorbed into Navarro-Aragonese first and Castilian later in the 15th century, after their exclusive boroughs broke up (1423, Pamplona's boroughs unified). Gascon-speaking communities were called in for trading purposes by Navarrese kings in the early 12th century to the coastal fringe extending from San Sebastian to the Bidasoa River, where they settled down. The language variant used was different from the ones used in Navarre, i.e. a Béarnese dialect of Gascon, with Gascon being in use far longer than in Navarre and Aragon until the 19th century, thanks mainly to the close ties held by Donostia and Pasaia with Bayonne. Though it was still an everyday language for most of the rural population of southern France well into the 20th century, it is now spoken by about 100,000 people in France according to 2012 estimates. According to the 1999 census, there were 610,000 native speakers (almost all of whom are also native French speakers) and perhaps another million persons with some exposure to the language. Following the pattern of language shift, most of this remainder is to be found among the eldest populations. Occitan activists (called "Occitanists") have attempted, in particular with the advent of Occitan-language preschools (the "Calandretas"), to reintroduce the language to the young. Nonetheless, the number of proficient speakers of Occitan is dropping precipitously. A tourist in the cities in southern France is unlikely to hear a single Occitan word spoken on the street (or, for that matter, in a home), and is likely to only find the occasional vestige, such as street signs (and, of those, most will have French equivalents more prominently displayed), to remind them of the traditional language of the area. Occitans, as a result of more than 200 years of conditioned suppression and humiliation (see Vergonha), seldom speak their own language in the presence of foreigners, whether they are from abroad or from outside Occitania (in this case, often merely and abusively referred to as "Parisiens" or "Nordistes", which means "northerners"). Occitan is still spoken by many elderly people in rural areas, but they generally switch to French when dealing with outsiders. Occitan's decline is somewhat less pronounced in Béarn because of the province's history (a late addition to the Kingdom of France), though even there the language is little spoken outside the homes of the rural elderly. The village of Artix is notable for having elected to post street signs in the local language. The area where Occitan was historically dominant has approximately 16 million inhabitants. Recent research has shown it may be spoken as a first language by approximately 789,000 people in France, Italy, Spain and Monaco. In Monaco, Occitan coexists with Monégasque Ligurian, which is the other native language. Some researchers state that up to seven million people in France understand the language, whereas twelve to fourteen million fully spoke it in 1921. In 1860, Occitan speakers represented more than 39% of the whole French population (52% for francophones proper); they were still 26% to 36% in the 1920s and fewer than 7% in 1993. Occitan is fundamentally defined by its dialects, rather than being a unitary language. That point is very conflictual in Southern France, as many people do not recognize Occitan as a real language and think that the next defined "dialects" are languages. Like other languages that fundamentally exist at a spoken, rather than written, level (e.g. the Rhaeto-Romance languages, Franco-Provençal, Astur-Leonese, and Aragonese), every settlement technically has its own dialect, with the whole of Occitania forming a classic dialect continuum that changes gradually along any path from one side to the other. Nonetheless, specialists commonly divide Occitan into six main dialects: Gascon is the most divergent, and descriptions of the main features of Occitan often consider Gascon separately. Max Wheeler notes that "probably only its copresence within the French cultural sphere has kept [Gascon] from being regarded as a separate language", and compares it to Franco-Provençal, which is considered a separate language from Occitan but is "probably not more divergent from Occitan overall than Gascon is". There is no general agreement about larger groupings of these dialects. Max Wheeler divides the dialects into two groups: Pierre Bec divides the dialects into three groups: Bec also notes that some linguists prefer a "supradialectal" classification that groups Occitan with Catalan as a part of a wider Occitano-Romanic group. One such classification posits three groups: According to this view, Catalan is an ausbau language that became independent from Occitan during the 13th century, but originates from the Aquitano-Pyrenean group. Domergue Sumien proposes a slightly different supradialectal grouping. All these regional varieties of the Occitan language are written, so Occitan can be considered as a pluricentric language. Standard Occitan, also called "occitan larg" (i.e., 'wide Occitan') is a synthesis that respects and admits soft regional adaptations (which are based on the convergence of previous regional koinés). The standardisation process began with the publication of "Gramatica occitana segon los parlars lengadocians", grammar of the languedocien dialect, by Louis Alibert (1935), followed by the "Dictionnaire occitan-français selon les parlers languedociens" (French-Occitan dictionary according to Languedocien) by the same author (1966), completed during the 1970s with the works of Pierre Bec (Gascon), Robèrt Lafont (Provençal) and others. But it has not been achieved yet. It is mostly supported by users of the classical norm. Due to the strong situation of diglossia, some users still reject the standardisation process and do not conceive Occitan as a language that could work just as other standardised languages. There are two main linguistic norms currently used for Occitan, one (known as "classical"), which is based on that of Medieval Occitan, and one (sometimes known as "Mistralian", due to its use by Frédéric Mistral), which is based on modern French orthography. Sometimes, there is conflict between users of each system. There are also two other norms but they have a lesser audience. The "Escòla dau Pò norm" (or "Escolo dóu Po norm") is a simplified version of the Mistralian norm and is used only in the Occitan Valleys (Italy), besides the classical norm. The "Bonnaudian norm" (or "écriture auvergnate unifiée, EAU") was created by Pierre Bonnaud and is used only in the Auvergnat dialect, besides the classical norm. Note that Catalan version was translated from the Spanish, while the Occitan versions were translated from the French. The second part of the Catalan version may also be rendered as "Són dotades de raó i de consciència, i els cal actuar entre si amb un esperit de fraternitat", showing the similarities between Occitan and Catalan. The majority of scholars think that Occitan constitutes a single language. Some authors, constituting a minority, reject this opinion and even the name "Occitan", thinking that there is a family of distinct rather than dialects of a single language. Many Occitan linguists and writers, particularly those involved with the pan-Occitan movement centred on the Institut d'Estudis Occitans, disagree with the view that Occitan is a family of languages and think that Limousin, Auvergnat, Languedocien, Gascon, Provençal and Vivaro-Alpine are dialects of a single language. Although there are indeed noticeable differences between these varieties, there is a very high degree of mutual intelligibility between them; they also share a common literary history, and in academic and literary circles, have been identified as a collective linguistic entity—the —for centuries. Some Provençal authors continue to support the view that Provençal is a separate language. Nevertheless, the vast majority of Provençal authors and associations think that Provençal is a part of Occitan. This debate about the status of Provençal should not be confused with the debate concerning the spelling of Provençal. For example, the classical system writes "Polonha", whereas the Mistralian spelling system has "Poulougno", for, 'Poland'. The question of Gascon is similar. Gascon presents a number of significant differences from the rest of the language; but, despite these differences, Gascon and other Occitan dialects have very important common lexical and grammatical features, so authors such as Pierre Bec argue that they could never be considered as different as, for example, Spanish and Italian. In addition, Gascon's being included in Occitan despite its particular differences can be justified because there is a common elaboration ("Ausbau") process between Gascon and the rest of Occitan. The vast majority of the Gascon cultural movement considers itself as a part of the Occitan cultural movement. And the official status of Val d'Aran (Catalonia, Spain), adopted in 1990, says that Aranese is a part of Gascon and Occitan. A grammar of Aranese by Aitor Carrera, published in 2007 in Lleida, presents the same view. The exclusion of Catalan from the Occitan sphere, even though Catalan is closely related, is justified because there has been a consciousness of its being different from Occitan since the later Middle Ages and because the elaboration ("Ausbau") processes of Catalan and Occitan (including Gascon) have been quite distinct since the 20th century. Nevertheless, other scholars point out that the process that led to the affirmation of Catalan as a distinct language from Occitan started during the period when the pressure to include Catalan-speaking areas in a mainstream Spanish culture was at its greatest. The answer to the question of whether Gascon or Catalan should be considered dialects of Occitan or separate languages has long been a matter of opinion or convention, rather than based on scientific ground. However, two recent studies support Gascon's being considered a distinct language. For the very first time, a quantifiable, statistics-based approach was applied by Stephan Koppelberg in attempt to solve this issue. Based on the results he obtained, he concludes that Catalan, Occitan, and Gascon should all be considered three distinct languages. More recently, Y. Greub and J.P. Chambon (Sorbonne University, Paris) demonstrated that the formation of Proto-Gascon was already complete at the eve of the 7th century, whereas Proto-Occitan was not yet formed at that time. These results induced linguists to do away with the conventional classification of Gascon, favoring the "distinct language" alternative. Both studies supported the early intuition of late Kurt Baldinger, a specialist of both medieval Occitan and medieval Gascon, who recommended that Occitan and Gascon be classified as separate languages. Jules Ronjat has sought to characterize Occitan by 19 principal criteria, as generalized as possible. Of those, 11 are phonetic, five morphologic, one syntactic, and two lexical. Close rounded vowels are rare or absent in Occitan. This characteristic often carries through to an Occitan speaker's French, leading to a distinctive "méridional" accent. Unlike French, it is a pro-drop language, allowing the omission of the subject ("canti": I sing; "cantas" you sing). Among these 19 discriminating criteria, 7 are different from Spanish, 8 from Italian, 12 from Franco-Provençal, and 16 from French. Most features of Occitan are shared with either French or Catalan, or both. Examples of pan-Occitan features shared with French, but not Catalan: Examples of pan-Occitan features shared with Catalan, but not French: Examples of pan-Occitan features not shared with Catalan or French: Examples of dialect-specific features of the northerly dialects shared with French, but not Catalan: Examples of dialect-specific features of the southerly dialects (or some of them) shared with Catalan, but not French: Examples of Gascon-specific features not shared with French or Catalan: Examples of other dialect-specific features not shared with French or Catalan: A comparison of terms and word counts between languages is not easy, as it is impossible to count the number of words in a language. (See Lexicon, Lexeme, Lexicography for more information.) Some have claimed around 450,000 words exist in the Occitan language, a number comparable to English (the Webster's Third New International Dictionary, Unabridged with 1993 addenda reaches 470,000 words, as does the Oxford English Dictionary, Second edition). The Merriam-Webster Web site estimates that the number is somewhere between 250,000 and 1 million words. The magazine "Géo" (2004, p. 79) claims that American English literature can be more easily translated into Occitan than French, excluding modern technological terms that both languages have integrated. A comparison of the lexical content can find more subtle differences between the languages. For example, Occitan has 128 synonyms related to cultivated land, 62 for wetlands, and 75 for sunshine ("Géo"). The language went through an eclipse during the Industrial Revolution, as the vocabulary of the countryside became less important. At the same time, it was disparaged as a patois. Nevertheless, Occitan has also incorporated new words into its lexicon to describe the modern world. The Occitan word for web is "oèb", for example. One interesting and useful feature of the Occitan language is its virtually infinite ability to create new words through a number of interchangeable and embeddable suffixes, giving the original terms a whole array of semantic nuances. The separation of Catalan from Occitan is seen by some as largely politically (rather than linguistically) motivated. However, the variety that has become standard Catalan differs from the one that has become standard Occitan in a number of ways. Here are just a few examples: Despite these differences, Occitan and Catalan remain more or less mutually comprehensible, especially when written – more so than either is with Spanish or French, for example, although this is mainly a consequence of using the classical (orthographical) norm of the Occitan, which is precisely focused in showing the similarities between the Occitan dialects with Catalan. Occitan and Catalan form a common diasystem (or a common Abstandsprache), which is called Occitano-Romance, according to the linguist Pierre Bec. Speakers of both languages share early historical and cultural heritage. The combined Occitano-Romance area is 259,000 km and represents 23 million speakers. However, the regions are not equal in terms of language speakers. According to Bec 1969 (pp. 120–121), in France, no more than a quarter of the population in counted regions could speak Occitan well, though around half understood it; it is thought that the number of Occitan users has decreased dramatically since then. By contrast, in the Catalonia administered by the Government of Catalonia, nearly three-quarters of the population speak Catalan and 95% understand it. One of the most notable passages of Occitan in Western literature occurs in the 26th "canto" of Dante's "Purgatorio" in which the troubadour Arnaut Daniel responds to the narrator: The above strophe translates to: Another notable Occitan quotation, this time from Arnaut Daniel's own 10th "Canto": Modern Occitan: Translation: French writer Victor Hugo's classic "Les Misérables" also contains some Occitan. In Part One, First Book, Chapter IV, "Les œuvres semblables aux paroles", one can read about Monseigneur Bienvenu: Translation: The Spanish playwright Lope de Rueda included a Gascon servant for comical effect in one of his short pieces, "La generosa paliza". John Barnes's "Thousand Cultures" science fiction series ("A Million Open Doors", 1992; "Earth Made of Glass", 1998; "The Merchants of Souls", 2001; and "The Armies of Memory", 2006), features Occitan. So does the 2005 best-selling novel "Labyrinth" by English author Kate Mosse. It is set in Carcassonne, where she owns a house and spends half of the year. The French composer Joseph Canteloube created five sets of folk songs entitled "Songs of the Auvergne", in which the lyrics are in the Auvergne dialect of Occitan. The orchestration strives to conjure vivid pastoral scenes of yesteryear. Michael Crichton features Occitan in his "Timeline" novel.
Occitan (,, ), also known as lenga d'òc (; ) by its native speakers, is a Romance language (or branch of numerous of these) spoken in Southern France, Monaco, Italy's Occitan Valleys, as well as Spain's Val d'Aran; collectively, these regions are sometimes referred to as Occitania. It is also spoken in the linguistic enclave of Guardia Piemontese (Calabria, Italy). Some include Catalan in Occitan, as the distance between this language and some Occitan dialects (such as the Gascon language) is similar to the distance among different Occitan dialects. In fact, Catalan was considered a dialect of Occitan until the end of the 19th century and still today remains its closest relative.
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summarize: Venus is one of the four terrestrial planets in the Solar System, meaning that it is a rocky body like Earth. It is similar to Earth in size and mass, and is often described as Earth's "sister" or "twin". The diameter of Venus is —only less than Earth's—and its mass is 81.5% of Earth's. Conditions on the Venusian surface differ radically from those on Earth because its dense atmosphere is 96.5% carbon dioxide, with most of the remaining 3.5% being nitrogen. The Venusian surface was a subject of speculation until some of its secrets were revealed by planetary science in the 20th century. Venera landers in 1975 and 1982 returned images of a surface covered in sediment and relatively angular rocks. The surface was mapped in detail by "Magellan" in 1990–91. The ground shows evidence of extensive volcanism, and the sulfur in the atmosphere may indicate that there have been recent eruptions. About 80% of the Venusian surface is covered by smooth, volcanic plains, consisting of 70% plains with wrinkle ridges and 10% smooth or lobate plains. Two highland "continents" make up the rest of its surface area, one lying in the planet's northern hemisphere and the other just south of the equator. The northern continent is called Ishtar Terra after Ishtar, the Babylonian goddess of love, and is about the size of Australia. Maxwell Montes, the highest mountain on Venus, lies on Ishtar Terra. Its peak is above the Venusian average surface elevation. The southern continent is called Aphrodite Terra, after Much of the Venusian surface appears to have been shaped by volcanic activity. Venus has several times as many volcanoes as Earth, and it has 167 large volcanoes that are over across. The only volcanic complex of this size on Earth is the Big Island of Hawaii. This is not because Venus is more volcanically active than Earth, but because its crust is older. Earth's oceanic crust is continually recycled by subduction at the boundaries of tectonic plates, and has an average age of about 100 million years, whereas the Venusian surface is estimated to be 300–600 million years old. Several lines of evidence point to ongoing volcanic activity on Venus. Sulphur dioxide concentrations in the atmosphere dropped by a factor of 10 between 1978 and 1986, jumped in 2006, and again declined 10-fold. This may mean that levels had been boosted several times by large volcanic eruptions. It has also been suggested that Venusian lightning (discussed below) could originate from volcanic activity (i.e. volcanic lightning). In January 2020, astronomers reported evidence that suggests that Venus is currently volcanically active. In 2008 and 2009, the first direct evidence for ongoing volcanism was observed by "Venus Express", in the Without seismic data or knowledge of its moment of inertia, little direct information is available about the internal structure and geochemistry of Venus. The similarity in size and density between Venus and Earth suggests they share a similar internal structure: a core, mantle, and crust. Like that of Earth, the Venusian core is at least partially liquid because the two planets have been Venus has an extremely dense atmosphere composed of 96.5% carbon dioxide, 3.5% nitrogen, and traces of other gases including sulfur dioxide. The mass of its atmosphere is 93 times that of Earth's, whereas the pressure at its surface is about 92 times that at Earth's—a pressure equivalent to that at a depth of nearly under Earth's oceans. The density at the surface is 65 kg/m, 6.5% that of water or 50 times as dense as Earth's atmosphere at at sea level. The -rich atmosphere generates the strongest greenhouse effect in the Solar System, creating surface temperatures of at least. This makes Venus's surface hotter than Mercury's, which has a minimum surface temperature of and maximum surface temperature of, even though Venus is nearly twice Mercury's distance from the Sun and thus receives only 25% of Mercury's solar irradiance. This temperature is higher than that used for sterilization. In 1967, "Venera 4" found Venus's magnetic field to be much weaker than that of Earth. This magnetic field is induced by an interaction between the ionosphere and the solar wind, rather than by an internal dynamo as in the Earth's core. Venus's small induced magnetosphere provides negligible protection to the atmosphere against cosmic radiation. The lack of an intrinsic magnetic field at Venus was surprising, given that it is similar to Earth in size and was expected also to contain a dynamo at its core. A dynamo requires three things: a conducting liquid, rotation, and convection. The core is thought to be electrically conductive and, although its rotation is often thought to be too slow, simulations show it is adequate to produce a dynamo. This implies that the dynamo is missing because of a lack of convection in Venus's core. On Earth, convection occurs in the liquid outer layer of the core because the bottom of the liquid layer is much higher in temperature than the top. On Venus, Venus orbits the Sun at an average distance of about, and completes an orbit every 224.7 days. Although all planetary orbits are elliptical, Venus's orbit is the closest to circular, with an eccentricity of less than 0.01. When Venus lies between Earth and the Sun in inferior conjunction, it makes the closest approach to Earth of any planet at an average distance of. However, it spends a large amount of its time away from Earth, meaning that it is the closest planet to Earth for only a minority of the time. This means that Mercury is actually the planet that is closest to Earth a plurality of the time. The planet reaches inferior conjunction every 584 days, on average. Because of the decreasing eccentricity of Earth's orbit, the minimum distances will become greater over tens of thousands of years. From the year 1 to 5383, there are 526 approaches less than 40 million km; then there are none for about 60,158 years. All the planets in the Solar System orbit the Sun in an anticlockwise direction as viewed from above Earth's north pole. Most planets also rotate on their axes in an anti-clockwise direction, but Venus rotates clockwise in retrograde rotation once every 243 Earth days—the slowest rotation of any planet. Because its rotation is so slow, Venus is very close to spherical. A Venusian sidereal day thus lasts longer than a Venusian year (243 versus 224.7 Earth days). Venus's equator rotates at, whereas Earth's rotates at. Venus's rotation To the naked eye, Venus appears as a white point of light brighter than any other planet or star (apart from the Sun). The planet's mean apparent magnitude is −4.14 with a standard deviation of 0.31. The brightest magnitude occurs during crescent phase about one month before or after inferior conjunction. Venus fades to about magnitude −3 when it is backlit by the Sun. The planet is bright enough to be seen in a clear midday sky and is more easily visible when the Sun is low on the horizon or setting. As an inferior planet, it always lies within about 47° of the Sun. Venus "overtakes" Earth every 584 days as it orbits the Sun. As it does so, it changes from the "Evening Star", visible after sunset, to the "Morning Star", visible before sunrise. Although Mercury, the other inferior planet, reaches a maximum elongation of only 28° and is often difficult to discern in twilight, Venus is hard to miss when it is at its brightest. Its greater maximum elongation means it is visible in dark skies long after sunset. As the brightest point-like object in the sky, Venus is a commonly misreported "unidentified flying object". As it orbits the Sun, Venus displays phases like those of the Moon in a telescopic view. The planet appears as a small and "full" disc when it is on the opposite side of the Sun (at superior conjunction). Venus shows a larger disc and "quarter phase" The Venusian orbit is slightly inclined relative to Earth's orbit; thus, when the planet passes between Earth and the Sun, it usually does not cross the face of the Sun. Transits of Venus occur when the planet's inferior conjunction coincides with its presence in the plane of Earth's orbit. Transits of Venus occur in cycles of with the current pattern of transits being pairs of transits separated by eight years, at intervals of about or —a pattern first discovered in 1639 by the English astronomer Jeremiah The pentagram of Venus is the path that Venus makes as observed from Earth. Successive inferior conjunctions of Venus repeat very near a Naked eye observations of Venus during daylight hours exist in several anecdotes and records. Astronomer Edmund Halley calculated its maximum naked eye brightness in 1716, when many Londoners were alarmed by its appearance in the daytime. French emperor A long-standing mystery of Venus observations is the so-called ashen light—an apparent weak illumination of its dark side, seen when the planet is in the crescent phase. The first claimed observation Because the movements of Venus appear to be discontinuous (it disappears due to its proximity to the sun, for many days at a time, and then reappears on the other horizon), some cultures did not recognize Venus as single entity; instead, they assumed it to be two separate stars on each horizon: the morning and evening star. Nonetheless, a cylinder seal from the Jemdet Nasr period and the Venus tablet of Ammisaduqa from the First Babylonian dynasty indicate that the ancient Sumerians already knew that the morning and evening stars were the same celestial object. In the Old Babylonian period, the planet Venus was known as Little more was discovered about Venus until the 20th century. Its almost featureless disc gave no hint what its surface might be like, and it was only with the development of spectroscopic, radar and ultraviolet observations that more of its secrets were revealed. The first ultraviolet observations were carried out in the 1920s, when Frank E. Ross found that ultraviolet photographs revealed considerable detail that was absent in visible and infrared radiation. He suggested this was due to a dense, yellow lower atmosphere with high cirrus clouds above it. Spectroscopic observations in the 1900s gave the first clues about the The first robotic space probe mission to Venus, and the first to any planet, began with the Soviet Venera program in 1961. The United States' exploration of Venus had its first success with the Mariner 2 mission on 14 December 1962, becoming the world's first successful interplanetary mission, passing above the surface of Venus, and gathering data on the planet's atmosphere. On 18 October 1967, the Soviet "Venera 4" successfully entered the atmosphere and deployed science experiments. "Venera 4" showed the surface temperature was hotter than "Mariner 2" had calculated, at almost, determined that the atmosphere was 95% carbon dioxide (), and discovered that Venus's atmosphere was considerably denser than "Venera 4" designers had anticipated. The joint "Venera 4"–"Mariner 5" data were analysed by a combined Soviet–American science team in a series of colloquia over the following year, in an early example of space cooperation. In 1974, "Mariner 10" swung by Venus on its way to Mercury and took ultraviolet photographs of the clouds, revealing the extraordinarily high wind Venus is a primary feature of the night sky, and so has been of remarkable importance in mythology, astrology and fiction throughout history and in different cultures. In Sumerian religion, Inanna was associated with the planet Venus. Several hymns praise Inanna in her role as the goddess of the planet Venus. Theology professor Jeffrey Cooley has argued that, in many myths, Inanna's movements may correspond with the movements of the planet Venus in the sky. The discontinuous movements of Venus relate to both mythology as well as Inanna's dual nature. In "Inanna's Descent to the Underworld", unlike any other deity, Inanna is able to descend into the netherworld and return to the heavens. The planet Venus appears to make a similar descent, setting in the West and then rising again in the East. An introductory hymn describes Inanna leaving the heavens and heading for "Kur", what could be presumed to be, the mountains, replicating the rising and setting of Inanna to the West. In "Inanna and Shukaletuda" and "Inanna's Descent into the Underworld" appear to parallel the motion of the planet Venus. In "Inanna and Shukaletuda", Shukaletuda is described as scanning the heavens in search of Inanna, possibly searching the eastern and western horizons. In the same myth, while searching for her attacker, Inanna herself makes several movements that correspond with the movements of Venus in the sky. Classical poets such as Homer, Sappho, Ovid and Virgil spoke of the star and its light. Poets such as William Blake, Robert Frost,, Alfred Lord Tennyson and William Wordsworth wrote odes to it. In Chinese the planet is called Jīn-xīng (金星), the golden planet of the metal element. In India Shukra Graha ("the planet Shukra") which is named after a powerful saint Shukra. "Shukra" which is used in Indian Vedic astrology means "clear, pure" or "brightness, clearness" in Sanskrit. One of the nine Navagraha, it is held to affect wealth, pleasure and reproduction; it was the son of Bhrgu, preceptor of the Daityas, and guru of the Asuras. The word "Shukra" is also associated with semen, or generation. Venus is known as Kejora in Indonesian and Malay. Modern Chinese, Japanese and Korean cultures refer to the planet literally as the "metal star" (), based on the Five elements. The Maya considered Venus to be the most important celestial body after the Sun and Moon. They called it "Chac ek", or "Noh Ek"<nowiki>'</nowiki>, "the Great Star". The cycles of Venus were important to their calendar. The Ancient Egyptians and Greeks believed Venus to be two separate bodies, a morning star and an evening star. The Egyptians knew the morning star as Tioumoutiri and the evening star as Ouaiti. The Greeks used the names "Phōsphoros" (Φωσφόρος), meaning "light-bringer" (whence the element phosphorus; alternately "Ēōsphoros" (Ἠωςφόρος), meaning "dawn-bringer"), for the morning star, and "Hesperos" (Ἕσπερος), meaning "Western one", for the evening star. Though by the Roman era they were recognized as one celestial object, known as "the star of Venus", the traditional two Greek names continued to be used, though usually translated to Latin as "Lūcifer" and "Vesper". The speculation of the existence of life on Venus has decreased significantly since the early 1960s, when spacecraft began studying Venus and it became clear that the conditions on Venus are extreme compared to those on Earth. That Venus is closer to the Sun than Earth, raising temperatures on the surface to nearly, that its atmospheric pressure is 90 times that of Earth, and the extreme impact of the greenhouse effect make water-based life as currently known unlikely. A few scientists have speculated that thermoacidophilic extremophile microorganisms might exist in the lower-temperature, acidic upper layers of the Venusian atmosphere. The atmospheric pressure and temperature fifty kilometres above the surface are similar to those at Earth's surface. This has led to proposals to use aerostats (lighter-than-air balloons) for initial exploration and ultimately for permanent "floating cities" in the Venusian atmosphere. Among the many engineering challenges are the dangerous amounts of sulfuric acid at these heights. Nonetheless, in August 2019, astronomers reported that newly discovered long-term pattern of absorbance and albedo changes in the atmosphere of the planet Venus are caused by "unknown absorbers", which may be chemicals or even large colonies of microorganisms high up in the atmosphere of the planet.
Venus is the second planet from the Sun. It is named after the Roman goddess of love and beauty. As the second-brightest natural object in the night sky after the Moon, Venus can cast shadows and can be, on rare occasion, visible to the naked eye in broad daylight. Venus lies within Earth's orbit, and so never appears to venture far from the Sun, either setting in the west just after dusk or rising in the east a bit before dawn. Venus orbits the Sun every 224.7 Earth days. With a rotation period of 243 Earth days, it takes longer to rotate about its axis than any other planet in the Solar System and does so in the opposite direction to all but Uranus (meaning the Sun rises in the west and sets in the east). Venus does not have any moons, a distinction it shares only with Mercury among planets in the Solar System.
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summarize: Saturn is a gas giant because it is predominantly composed of hydrogen and helium. It lacks a definite surface, though it may have a solid core. Saturn's rotation causes it to have the shape of an oblate spheroid; that is, it is flattened at the poles and bulges at its equator. Its equatorial and polar radii differ by almost 10%: 60,268 km versus 54,364 km. Jupiter, Uranus, and Neptune, the other giant planets in the Solar System, are also oblate but to a lesser extent. The combination of the bulge and rotation rate means that the effective surface gravity along the equator,, is 74% that at the poles and is lower than the surface gravity of Earth. However, the equatorial escape velocity of nearly is much higher than that for Earth. Saturn is the only planet of the Solar System that is less dense than water—about 30% less. Although Saturn's core is considerably denser than water, the average specific density of the planet is due to the atmosphere. Jupiter has 318 times Earth's mass, and Saturn is 95 times Earth's mass. Together, Jupiter and Saturn hold 92% of the total planetary mass in the Solar System. Despite consisting mostly of hydrogen and helium, most of Saturn's mass is not in the gas phase, because hydrogen becomes a non-ideal liquid when the density is above, which is reached at a radius containing 99.9% of Saturn's mass. The temperature, pressure, and density inside Saturn all rise steadily toward the core, which causes hydrogen to be a metal in the deeper layers. Standard planetary models suggest that the interior of Saturn is similar to that of Jupiter, having a small rocky core surrounded by hydrogen and helium, with trace amounts of various volatiles. This core is similar in composition to Earth, but is more dense. The examination of Saturn's gravitational moment, in combination with physical models of the interior, has allowed constraints to be placed on the mass of Saturn's core. In 2004, scientists estimated that the core must be 9–22 times the mass of Earth, which corresponds to a diameter of about 25,000 km. This is surrounded by a thicker liquid metallic hydrogen layer, followed by a liquid layer of helium-saturated molecular hydrogen that gradually transitions to a gas with increasing altitude. The outermost layer spans 1,000 km and consists of gas. Saturn has a hot interior, reaching 11,700 °C at its core, and it radiates 2.5 times more energy into space than it receives from the Sun. Jupiter's thermal energy is generated by the Kelvin–Helmholtz mechanism of slow gravitational compression, but such a process alone may not be sufficient to explain heat production for Saturn, because it is less massive. An alternative or additional mechanism may be generation of heat through the "raining out" of droplets of helium deep in Saturn's interior. As the droplets descend through the lower-density hydrogen, the process releases heat by friction and leaves Saturn's outer layers depleted of helium. These descending droplets may have accumulated into a helium shell surrounding the core. Rainfalls of diamonds have been suggested to occur within Saturn, as well as in Jupiter and ice giants Uranus and Neptune. The outer atmosphere of Saturn contains 96.3% molecular hydrogen and 3.25% helium by volume. The proportion of helium is significantly deficient compared to the abundance of this element in the Sun. The quantity of elements heavier than helium (metallicity) is not known precisely, but the proportions are assumed to match the primordial abundances from the formation of the Solar System. The total mass of these heavier elements is estimated to be 19–31 times the mass of the Earth, with a significant fraction located in Saturn's core region. Trace amounts of ammonia, acetylene, ethane, propane, phosphine, and methane have been detected in Saturn's atmosphere. The upper clouds are composed of ammonia crystals, while the lower level clouds appear to consist of either ammonium hydrosulfide () or water. Ultraviolet radiation from the Sun causes methane photolysis in the upper atmosphere, leading to a series of hydrocarbon chemical reactions with the resulting products being carried downward by eddies and diffusion. This photochemical cycle is modulated by Saturn's annual seasonal cycle. Saturn's atmosphere exhibits a banded pattern similar to Jupiter's, but Saturn's bands are much fainter and are much wider near the equator. The nomenclature used to describe these bands is the same as on Jupiter. Saturn's finer cloud patterns were not observed until the flybys of the "Voyager" spacecraft during the 1980s. Since then, Earth-based telescopy has improved to the point where regular observations can be made. The composition of the clouds varies with depth and increasing pressure. In the upper cloud layers, with the temperature in the range 100–160 K and pressures extending between 0.5–2 bar, the clouds consist of ammonia ice. Water ice clouds begin at a level where the pressure is about 2.5 bar and extend down to 9.5 bar, where temperatures range from 185–270 K. Intermixed in this layer is a band of ammonium hydrosulfide ice, lying in the pressure range 3–6 bar with temperatures of 190–235 K. Finally, the lower layers, where pressures are between 10–20 bar and temperatures are 270–330 K, contains a region of water droplets with ammonia in aqueous solution. Saturn's usually bland atmosphere occasionally exhibits long-lived ovals and other features common on Jupiter. In 1990, the Hubble Space Telescope imaged an enormous white cloud near Saturn's equator that was not present during the "Voyager" encounters, and in 1994 another smaller storm was observed. The 1990 storm was an example of a Great White Spot, a unique but short-lived phenomenon that occurs once every Saturnian year, roughly every 30 Earth years, around the time of the northern hemisphere's summer solstice. Previous Great White Spots were observed in 1876, 1903, 1933 and 1960, with the 1933 storm being the most famous. If the periodicity is maintained, another storm will occur in about 2020. The winds on Saturn are the second fastest among the Solar System's planets, after Neptune's. "Voyager" data indicate peak easterly winds of. In images from the "Cassini" spacecraft during 2007, Saturn's northern hemisphere displayed a bright blue hue, similar to Uranus. The color was most likely caused by Rayleigh scattering. Thermography has shown that Saturn's south pole has a warm polar vortex, the only known example of such a phenomenon in the Solar System. Whereas temperatures on Saturn are normally −185 °C, temperatures on the vortex often reach as high as −122 °C, suspected to be the warmest spot on Saturn. A persisting hexagonal wave pattern around the north polar vortex in the atmosphere at about 78°N was first noted in the "Voyager" images. The sides of the hexagon are each about long, which is longer than the diameter of the Earth. The entire structure rotates with a period of (the same period as that of the planet's radio emissions) which is assumed to be equal to the period of rotation of Saturn's interior. The hexagonal feature does not shift in longitude like the other clouds in the visible atmosphere. The pattern's origin is a matter of much speculation. Most scientists think it is a standing wave pattern in the atmosphere. Polygonal shapes have been replicated in the laboratory through differential rotation of fluids. HST imaging of the south polar region indicates the presence of a jet stream, but no strong polar vortex nor any hexagonal standing wave. NASA reported in November 2006 that "Cassini" had observed a "hurricane-like" storm locked to the south pole that had a clearly defined eyewall. Eyewall clouds had not previously been seen on any planet other than Earth. For example, images from the "Galileo" spacecraft did not show an eyewall in the Great Red Spot of Jupiter. The south pole storm may have been present for billions of years. This vortex is comparable to the size of Earth, and it has winds of 550 km/h. "Cassini" observed a series of cloud features nicknamed "String of Pearls" found in northern latitudes. These features are cloud clearings that reside in deeper cloud layers. Saturn has an intrinsic magnetic field that has a simple, symmetric shape – a magnetic dipole. Its strength at the equator – 0.2 gauss (20 μT) – is approximately one twentieth of that of the field around Jupiter and slightly weaker than Earth's magnetic field. As a result, Saturn's magnetosphere is much smaller than Jupiter's. When "Voyager 2" entered the magnetosphere, the solar wind pressure was high and the magnetosphere extended only 19 Saturn radii, or 1.1 million km (712,000 mi), although it enlarged within several hours, and remained so for about three days. Most probably, the magnetic field is generated similarly to that of Jupiter – by currents in the liquid metallic-hydrogen layer called a metallic-hydrogen dynamo. This magnetosphere is efficient at deflecting the solar wind particles from the Sun. The moon Titan orbits within the outer part of Saturn's magnetosphere and contributes plasma from the ionized particles in Titan's outer atmosphere. Saturn's magnetosphere, like Earth's, produces aurorae. The average distance between Saturn and the Sun is over 1.4 billion kilometers (9 AU). With an average orbital speed of 9.68 km/s, it takes Saturn 10,759 Earth days (or about years) to finish one revolution around the Sun. As a consequence, it forms a near 5:2 mean-motion resonance with Jupiter. The elliptical orbit of Saturn is inclined 2.48° relative to the orbital plane of the Earth. The perihelion and aphelion distances are, respectively, 9.195 and 9.957 AU, on average. The visible features on Saturn rotate at different rates depending on latitude and multiple rotation periods have been assigned to various regions (as in Jupiter's case). Astronomers use three different systems for specifying the rotation rate of Saturn. "System I" has a period of (844.3°/d) and encompasses the Equatorial Zone, the South Equatorial Belt, and the North Equatorial Belt. The polar regions are considered to have rotation rates similar to "System I". All other Saturnian latitudes, excluding the north and south polar regions, are indicated as "System II" and have been assigned a rotation period of (810.76°/d). "System III" refers to Saturn's internal rotation rate. Based on radio emissions from the planet detected by "Voyager 1" and "Voyager 2", System III has a rotation period of (810.8°/d). System III has largely superseded System II. A precise value for the rotation period of the interior remains elusive. While approaching Saturn in 2004, "Cassini" found that the radio rotation period of Saturn had increased appreciably, to approximately. The latest estimate of Saturn's rotation (as an indicated rotation rate for Saturn as a whole) based on a compilation of various measurements from the "Cassini", "Voyager" and "Pioneer" probes was reported in September 2007 is. In March 2007, it was found that the variation of radio emissions from the planet did not match Saturn's rotation rate. This variance may be caused by geyser activity on Saturn's moon Enceladus. The water vapor emitted into Saturn's orbit by this activity becomes charged and creates a drag upon Saturn's magnetic field, slowing its rotation slightly relative to the rotation of the planet. An apparent oddity for Saturn is that it does not have any known trojan asteroids. These are minor planets that orbit the Sun at the stable Lagrangian points, designated L and L, located at 60° angles to the planet along its orbit. Trojan asteroids have been discovered for Mars, Jupiter, Uranus, and Neptune. Orbital resonance mechanisms, including secular resonance, are believed to be the cause of the missing Saturnian trojans. Saturn has 82 known moons, 53 of which have formal names. In addition, there is evidence of dozens to hundreds of moonlets with diameters of 40–500 meters in Saturn's rings, which are not considered to be true moons. Titan, the largest moon, comprises more than 90% of the mass in orbit around Saturn, including the rings. Saturn's second-largest moon, Rhea, may have a tenuous ring system of its own, along with a tenuous atmosphere. Many of the other moons are small: 34 are less than 10 km in diameter and another 14 between 10 and 50 km in diameter. Traditionally, most of Saturn's moons have been named after Titans of Greek mythology. Titan is the only satellite in the Solar System with a major atmosphere, in which a complex organic chemistry occurs. It is the only satellite with hydrocarbon lakes. On 6 June 2013, scientists at the IAA-CSIC reported the detection of polycyclic aromatic hydrocarbons in the upper atmosphere of Titan, a possible precursor for life. On 23 June 2014, NASA claimed to have strong evidence that nitrogen in the atmosphere of Titan came from materials in the Oort cloud, associated with comets, and not from the materials that formed Saturn in earlier times. Saturn's moon Enceladus, which seems similar in chemical makeup to comets, has often been regarded as a potential habitat for microbial life. Evidence of this possibility includes the satellite's salt-rich particles having an "ocean-like" composition that indicates most of Enceladus's expelled ice comes from the evaporation of liquid salt water. A 2015 flyby by "Cassini" through a plume on Enceladus found most of the ingredients to sustain life forms that live by methanogenesis. In April 2014, NASA scientists reported the possible beginning of a new moon within the A Ring, which was imaged by "Cassini" on 15 April 2013. Saturn is probably best known for the system of planetary rings that makes it visually unique. The rings extend from outward from Saturn's equator and average approximately in thickness. They are composed predominantly of water ice with trace amounts of tholin impurities, and a peppered coating of approximately 7% amorphous carbon. The particles that make up the rings range in size from specks of dust up to 10 m. While the other gas giants also have ring systems, Saturn's is the largest and most visible. There are two main hypotheses regarding the origin of the rings. One hypothesis is that the rings are remnants of a destroyed moon of Saturn. The second hypothesis is that the rings are left over from the original nebular material from which Saturn was formed. Some ice in the E ring comes from the moon Enceladus's geysers. The water abundance of the rings varies radially, with the outermost ring A being the most pure in ice water. This abundance variance may be explained by meteor bombardment. Beyond the main rings at a distance of 12 million km from the planet is the sparse Phoebe ring, which is tilted at an angle of 27° to the other rings and, like Phoebe, orbits in retrograde fashion. Some of the moons of Saturn, including Pandora and Prometheus, act as shepherd moons to confine the rings and prevent them from spreading out. Pan and Atlas cause weak, linear density waves in Saturn's rings that have yielded more reliable calculations of their masses. The observation and exploration of Saturn can be divided into three main phases. The first era was ancient observations (such as with the naked eye), before the invention of the modern telescopes. Starting in the 17th century, progressively more advanced telescopic observations from Earth have been made. The third phase is visitation by space probes, by either orbiting or flyby. In the 21st century, observations continue from Earth (including Earth-orbiting observatories like the Hubble Space Telescope) and, until its 2017 retirement, from the "Cassini" orbiter around Saturn. Saturn has been known since prehistoric times, and in early recorded history it was a major character in various mythologies. Babylonian astronomers systematically observed and recorded the movements of Saturn. In ancient Greek, the planet was known as Phainon, and in Roman times it was known as the "star of Saturn". In ancient Roman mythology, the planet Phainon was sacred to this agricultural god, from which the planet takes its modern name. The Romans considered the god Saturnus the equivalent of the Greek god Cronus; in modern Greek, the planet retains the name "Cronus"—: "Kronos". The Greek scientist Ptolemy based his calculations of Saturn's orbit on observations he made while it was in opposition. In Hindu astrology, there are nine astrological objects, known as Navagrahas. Saturn is known as "Shani" and judges everyone based on the good and bad deeds performed in life. Ancient Chinese and Japanese culture designated the planet Saturn as the "earth star" (). This was based on Five Elements which were traditionally used to classify natural elements. In ancient Hebrew, Saturn is called 'Shabbathai'. Its angel is Cassiel. Its intelligence or beneficial spirit is 'Agȋȇl (), and its darker spirit (demon) is Zȃzȇl (). Zazel has been described as a great angel, invoked in Solomonic magic, who is "effective in love conjurations". In Ottoman Turkish, Urdu and Malay, the name of Zazel is 'Zuhal', derived from the Arabic language (). Saturn's rings require at least a 15-mm-diameter telescope to resolve and thus were not known to exist until Christiaan Huygens saw them in 1659. Galileo, with his primitive telescope in 1610, incorrectly thought of Saturn's appearing not quite round as two moons on Saturn's sides. It was not until Huygens used greater telescopic magnification that this notion was refuted, and the rings were truly seen for the first time. Huygens also discovered Saturn's moon Titan; Giovanni Domenico Cassini later discovered four other moons: Iapetus, Rhea, Tethys and Dione. In 1675, Cassini discovered the gap now known as the Cassini Division. No further discoveries of significance were made until 1789 when William Herschel discovered two further moons, Mimas and Enceladus. The irregularly shaped satellite Hyperion, which has a resonance with Titan, was discovered in 1848 by a British team. In 1899 William Henry Pickering discovered Phoebe, a highly irregular satellite that does not rotate synchronously with Saturn as the larger moons do. Phoebe was the first such satellite found and it takes more than a year to orbit Saturn in a retrograde orbit. During the early 20th century, research on Titan led to the confirmation in 1944 that it had a thick atmosphere – a feature unique among the Solar System's moons. "Pioneer 11" made the first flyby of Saturn in September 1979, when it passed within 20,000 km of the planet's cloud tops. Images were taken of the planet and a few of its moons, although their resolution was too low to discern surface detail. The spacecraft also studied Saturn's rings, revealing the thin F-ring and the fact that dark gaps in the rings are bright when viewed at high phase angle (towards the Sun), meaning that they contain fine light-scattering material. In addition, "Pioneer 11" measured the temperature of Titan. In November 1980, the "Voyager 1" probe visited the Saturn system. It sent back the first high-resolution images of the planet, its rings and satellites. Surface features of various moons were seen for the first time. "Voyager 1" performed a close flyby of Titan, increasing knowledge of the atmosphere of the moon. It proved that Titan's atmosphere is impenetrable in visible wavelengths; therefore no surface details were seen. The flyby changed the spacecraft's trajectory out from the plane of the Solar System. Almost a year later, in August 1981, "Voyager 2" continued the study of the Saturn system. More close-up images of Saturn's moons were acquired, as well as evidence of changes in the atmosphere and the rings. Unfortunately, during the flyby, the probe's turnable camera platform stuck for a couple of days and some planned imaging was lost. Saturn's gravity was used to direct the spacecraft's trajectory towards Uranus. The probes discovered and confirmed several new satellites orbiting near or within the planet's rings, as well as the small Maxwell Gap (a gap within the C Ring) and Keeler gap (a 42 km-wide gap in the A Ring). The "Cassini–Huygens" space probe entered orbit around Saturn on 1 July 2004. In June 2004, it conducted a close flyby of Phoebe, sending back high-resolution images and data. "Cassini" flyby of Saturn's largest moon, Titan, captured radar images of large lakes and their coastlines with numerous islands and mountains. The orbiter completed two Titan flybys before releasing the "Huygens" probe on 25 December 2004. "Huygens" descended onto the surface of Titan on 14 January 2005. Starting in early 2005, scientists used "Cassini" to track lightning on Saturn. The power of the lightning is approximately 1,000 times that of lightning on Earth. In 2006, NASA reported that "Cassini" had found evidence of liquid water reservoirs no more than tens of meters below the surface that erupt in geysers on Saturn's moon Enceladus. These jets of icy particles are emitted into orbit around Saturn from vents in the moon's south polar region. Over 100 geysers have been identified on Enceladus. In May 2011, NASA scientists reported that Enceladus "is emerging as the most habitable spot beyond Earth in the Solar System for life as we know it". "Cassini" photographs have revealed a previously undiscovered planetary ring, outside the brighter main rings of Saturn and inside the G and E rings. The source of this ring is hypothesized to be the crashing of a meteoroid off Janus and Epimetheus. In July 2006, images were returned of hydrocarbon lakes near Titan's north pole, the presence of which were confirmed in January 2007. In March 2007, hydrocarbon seas were found near the North pole, the largest of which is almost the size of the Caspian Sea. In October 2006, the probe detected an 8,000 km diameter cyclone-like storm with an eyewall at Saturn's south pole. From 2004 to 2 November 2009, the probe discovered and confirmed eight new satellites. In April 2013 "Cassini" sent back images of a hurricane at the planet's north pole 20 times larger than those found on Earth, with winds faster than. On 15 September 2017, the "Cassini-Huygens" spacecraft performed the "Grand Finale" of its mission: a number of passes through gaps between Saturn and Saturn's inner rings. The atmospheric entry of "Cassini" ended the mission. The continued exploration of Saturn is still considered to be a viable option for NASA as part of their ongoing New Frontiers program of missions. NASA previously requested for plans to be put forward for a mission to Saturn that included the Saturn Atmospheric Entry Probe, and possible investigations into the habitability and possible discovery of life on Saturn's moons Titan and Enceladus by "Dragonfly". Saturn is the most distant of the five planets easily visible to the naked eye from Earth, the other four being Mercury, Venus, Mars and Jupiter. (Uranus, and occasionally 4 Vesta, are visible to the naked eye in dark skies.) Saturn appears to the naked eye in the night sky as a bright, yellowish point of light. The mean apparent magnitude of Saturn is 0.46 with a standard deviation of 0.34. Most of the magnitude variation is due to the inclination of the ring system relative to the Sun and Earth. The brightest magnitude, −0.55, occurs near in time to when the plane of the rings is inclined most highly, and the faintest magnitude, 1.17, occurs around the time when they are least inclined. It takes approximately 29.5 years for the planet to complete an entire circuit of the ecliptic against the background constellations of the zodiac. Most people will require an optical aid (very large binoculars or a small telescope) that magnifies at least 30 times to achieve an image of Saturn's rings, in which clear resolution is present. When Earth passes through the ring plane, which occurs twice every Saturnian year (roughly every 15 Earth years), the rings briefly disappear from view because they are so thin. Such a "disappearance" will next occur in 2025, but Saturn will be too close to the Sun for observations. Saturn and its rings are best seen when the planet is at, or near, opposition, the configuration of a planet when it is at an elongation of 180°, and thus appears opposite the Sun in the sky. A Saturnian opposition occurs every year—approximately every 378 days—and results in the planet appearing at its brightest. Both the Earth and Saturn orbit the Sun on eccentric orbits, which means their distances from the Sun vary over time, and therefore so do their distances from each other, hence varying the brightness of Saturn from one opposition to the next. Saturn also appears brighter when the rings are angled such that they are more visible. For example, during the opposition of 17 December 2002, Saturn appeared at its brightest due to a favorable relative to the Earth, even though Saturn was closer to the Earth and Sun in late 2003. From time to time, Saturn is occulted by the Moon (that is, the Moon covers up Saturn in the sky). As with all the planets in the Solar System, occultations of Saturn occur in "seasons". Saturnian occultations will take place monthly for about a 12-month period, followed by about a five-year period in which no such activity is registered. The Moon's orbit is inclined by several degrees relative to Saturn's, so occultations will only occur when Saturn is near one of the points in the sky where the two planes intersect (both the length of Saturn's year and the 18.6-Earth year nodal precession period of the Moon's orbit influence the periodicity).
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine times that of Earth. It only has one-eighth the average density of Earth; however, with its larger volume, Saturn is over 95 times more massive. Saturn is named after the Roman god of wealth and agriculture; its astronomical symbol (♄) represents the god's sickle.
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summarize: In English, the planet is named for the Roman god of war, an association made because of its red color, which suggests blood. The adjectival form of Latin "Mars" is "Martius", which provides the English words "Martian", used as an adjective or for a putative inhabitant of Mars, and "Martial", used as an adjective corresponding to "Terrestrial" for Earth. In Greek, the planet is known as Ἄρης "Arēs", with the inflectional root Ἄρε- "Are-". From this comes technical terms such as "areology", as well as the adjective "Arean" and the star name "Antares". 'Mars' is also the basis of the name of the month of March (from Latin "Martius mēnsis"'month of Mars'), as well as (through Mars is approximately half the diameter of Earth, with a surface area only slightly less than the total area of Earth's dry land. Mars is less dense than Earth, having about 15% of Earth's volume and 11% of Earth's mass, resulting in about 38% of Earth's surface gravity. The red-orange appearance of the Martian surface is caused by iron(III) oxide, or rust. It can look like butterscotch; other common surface colors include golden, brown, tan, and greenish, depending on the minerals present. Like Earth, Mars has differentiated into a dense metallic core overlaid by less dense materials. Current models of its interior imply a core with a radius of about, consisting primarily of iron and nickel with about 16–17% sulfur. This iron(II) sulfide core is thought to be twice as rich in lighter elements as Mars is a terrestrial planet that consists of minerals containing silicon and oxygen, metals, and other elements that typically make up rock. The surface of Mars is primarily composed of tholeiitic basalt, although parts are more silica-rich than typical basalt and may be similar to andesitic rocks on Earth or silica glass. Regions of low albedo suggest concentrations of plagioclase feldspar, with northern low albedo regions displaying higher than normal concentrations of sheet silicates and high-silicon glass. Parts of the southern highlands include detectable amounts of high-calcium pyroxenes. Localized concentrations of hematite and olivine have been found. Much of the surface is deeply covered by finely grained iron(III) oxide dust. Although Mars has no evidence of a structured global magnetic field, observations show that parts of the planet's crust have been magnetized, suggesting that alternating polarity reversals of its dipole field have occurred in the past. This paleomagnetism of magnetically susceptible minerals is similar to the alternating bands found on Earth's ocean floors. One theory, published in 1999 and re-examined in October 2005 (with the help of the "Mars Global Surveyor"), is that these bands suggest plate tectonic activity on Mars four billion years ago, The "Phoenix" lander returned data showing Martian soil to be slightly alkaline and containing elements such as magnesium, sodium, potassium and chlorine. These nutrients are found in soils on Earth, and they are necessary for growth of plants. Experiments performed by the lander showed that the Martian soil has a basic pH of 7.7, and contains 0.6% of the salt perchlorate. This is a very high concentration and makes the Martian soil Liquid water cannot exist on the surface of Mars due to low atmospheric pressure, which is less than 1% that of Earth's, except at the lowest elevations for short periods. The two polar ice caps appear to be made largely of water. The volume of water ice in the south polar ice cap, if melted, would be sufficient to cover the entire planetary surface to a depth of. A permafrost mantle stretches from the pole to latitudes of about 60°. Large quantities of ice are thought to be trapped within the thick cryosphere of Mars. Radar data from "Mars Express" and the "Mars Reconnaissance Orbiter" show large quantities of ice at both poles (July 2005) and at middle latitudes (November 2008). The Phoenix lander directly sampled water ice in shallow Martian soil on July 31, 2008. Landforms visible on Mars strongly suggest that liquid water has existed on the planet's surface. Huge linear swathes of scoured ground, known as outflow channels, cut across the surface in about 25 places. These are thought to be a record of erosion caused by the catastrophic release of water from subsurface aquifers, though some of these structures have been hypothesized to result from the action of glaciers or lava. One of the larger examples, Ma'adim Vallis is long, much greater than the Grand Canyon, with a width of and a depth of in places. It is thought to have been carved by flowing water early in Mars's history. The youngest of these channels are thought to have formed as recently as only a few million years ago. Elsewhere, particularly on the oldest areas of the Martian surface, finer-scale, dendritic networks of valleys are spread across significant proportions of the landscape. Features of these valleys and their distribution strongly imply that they were carved by runoff resulting from precipitation in early Mars history. Subsurface water flow and groundwater sapping may play important subsidiary roles in some networks, but precipitation was probably the root cause of the incision in almost all cases. Along crater and canyon walls, there are thousands of features that appear similar to terrestrial gullies. The gullies tend to be in the highlands of the southern hemisphere and to face the Equator; all are poleward of 30° latitude. A number of authors have suggested that their formation process involves liquid water, probably from melting ice, although others have argued for formation mechanisms involving carbon dioxide frost or the movement of dry dust. No partially degraded gullies have formed by weathering and no superimposed impact craters have been observed, indicating that these are young features, possibly still active. Other geological features, Although better remembered for mapping the Moon, Johann Heinrich Mädler and Wilhelm Beer were the first areographers. They began by establishing that most of Mars's surface features were permanent and by more precisely determining the planet's rotation period. In 1840, Mädler combined ten years of observations and drew the first map of Mars. Rather than giving names to the various markings, Beer and Mädler simply designated them with letters; Meridian Bay (Sinus Meridiani) was thus feature ""a"". Today, features on Mars are named from a variety of sources. Albedo features are named for classical mythology. Craters larger than 60 km are named for deceased scientists and writers and others who have contributed to the study of Mars. Craters smaller than 60 km are named for towns and villages of the world with populations of less than 100,000. Large valleys are named for the word "Mars" or "star" in various languages; small valleys are named for rivers. Large albedo features retain many of the older names, but are often updated to reflect new knowledge of the nature of the features. For example, "Nix Olympica" (the snows of Mars lost its magnetosphere 4 billion years ago, possibly because of numerous asteroid strikes, so the solar wind interacts directly with the Martian ionosphere, lowering the atmospheric density by stripping away atoms from the outer layer. Both Mars Global Surveyor and Mars Express have detected ionised atmospheric particles trailing off into space behind Mars, and this atmospheric loss is being studied by the MAVEN orbiter. Compared to Earth, the atmosphere of Mars is quite rarefied. Atmospheric pressure on the surface today ranges from a low of on Olympus Mons to over in Hellas Planitia, with a Methane has been detected in the Martian atmosphere; it occurs in extended plumes, and the profiles imply that the methane is released from discrete regions. The concentration of methane fluctuates from about 0.24 ppb during the northern winter to about 0.65 ppb during the summer. Estimates of its lifetime range from 0.6–4 years, In 1994, the European Space Agency's Mars Express found an ultraviolet glow coming from "magnetic umbrellas" in the southern hemisphere. Mars does not have a global magnetic field which guides charged particles entering the atmosphere. Mars has multiple umbrella-shaped magnetic fields mainly in the southern hemisphere, which are remnants of a global field that decayed billions of years ago. In late December 2014, NASA's MAVEN spacecraft detected evidence of widespread auroras in Mars's northern hemisphere and descended to approximately 20–30 degrees North latitude of Mars's equator. The particles Of all the planets in the Solar System, the seasons of Mars are the most Earth-like, due to the similar tilts of the two planets' rotational axes. The lengths of the Martian seasons are about twice those of Earth's because Mars's greater distance from the Sun leads to the Martian year being about two Earth years long. Martian surface temperatures vary from lows of about at the winter polar caps to highs of up to in equatorial summer. The wide range in temperatures is due to the thin atmosphere which cannot store much solar heat, the low atmospheric pressure, and the low thermal inertia of Martian soil. The planet is 1.52 times as far from the Sun as Mars's average distance from the Sun is roughly, and its orbital period is 687 (Earth) days. The solar day (or sol) on Mars is only slightly longer than an Earth day: 24 hours, 39 minutes, and 35.244 seconds. A Martian year is equal to 1.8809 Earth years, or 1 year, 320 days, and 18.2 hours. The axial tilt of Mars is 25.19 degrees relative to its orbital plane, which is similar to the axial tilt of Earth. As a result, Mars has seasons like Earth, though on Mars they are nearly twice as long because its orbital period is that much longer. In the present day The current understanding of planetary habitability—the ability of a world to develop environmental conditions favorable to the emergence of life—favors planets that have liquid water on their surface. Most often this requires the orbit of a planet to lie within the habitable zone, which for the Sun extends from just beyond Venus to about the semi-major axis of Mars. During perihelion, Mars dips inside this region, but Mars's thin (low-pressure) atmosphere prevents liquid water from existing over large regions for extended periods. The past flow of liquid water demonstrates the planet's potential for habitability. Recent evidence has suggested that any water on the Martian surface may have been too salty and acidic to support regular terrestrial life. The lack of a magnetosphere and the extremely thin atmosphere of Mars are a challenge: the planet has little heat transfer across its surface, poor insulation against bombardment of the solar wind and insufficient atmospheric pressure to retain water in a liquid form (water instead sublimes to a gaseous state). Mars is nearly, or perhaps totally, geologically dead; the end of volcanic activity has apparently stopped the recycling of chemicals and minerals between the surface and interior of the planet. "In situ" investigations have been performed on Mars by the "Viking" landers, "Spirit" and "Opportunity" rovers, "Phoenix" lander, and "Curiosity" rover. Evidence suggests that the planet was once significantly more habitable than it is today, but whether living organisms ever existed there remains unknown. The Viking probes of the mid-1970s carried experiments designed to detect microorganisms in Martian soil at their respective landing sites and had positive results, including a temporary increase of production on exposure to water and nutrients. This sign of life was later disputed by scientists, resulting in a continuing debate, with NASA scientist Gilbert Levin asserting that Viking may have found life. A re-analysis of the Viking data, in light of modern knowledge of extremophile forms of life, has suggested that the Viking tests were not sophisticated enough to detect these forms of life. The tests could even have killed a (hypothetical) life form. Tests conducted by the Phoenix Mars lander have shown that the soil has an alkaline pH and it contains magnesium, sodium, potassium and chloride. Mars has two relatively small (compared to Earth's) natural moons, Phobos (about in diameter) and Deimos (about in diameter), which orbit close to the planet. Asteroid capture is a long-favored theory, but their origin remains uncertain. Both satellites were discovered in 1877 by Asaph Hall; they are named after the characters Phobos (panic/fear) and Deimos (terror/dread), who, in Greek mythology, accompanied their father Ares, god of war, into battle. Mars was the Roman counterpart of Ares. In modern Greek, the planet retains its ancient name "Ares" (Aris: "Άρης"). From the surface of Mars, the motions of Phobos and Deimos appear different from that of the Moon. Phobos rises in the west, sets in the east, and rises again in just 11 hours. Deimos, being only just outside synchronous orbit – where the orbital period would match the planet's period of rotation – rises as expected in the east but slowly. Despite the 30-hour orbit of Deimos, 2.7 days elapse between its rise and set for an equatorial observer, as it slowly falls behind Dozens of crewless spacecraft, including orbiters, landers, and rovers, have been sent to Mars by the Soviet Union, the United States, Europe, and India to study the planet's surface, climate, and geology. , Mars is host to eight functioning spacecraft: six in orbit—"2001 Mars Odyssey", "Mars Express", "Mars Reconnaissance Orbiter", "MAVEN", "Mars Orbiter Mission" and "ExoMars Trace Gas Orbiter"—and two on the surface—Mars Science Laboratory "Curiosity" (rover) and "InSight" (lander). The public can request images of Mars via the "Mars Reconnaissance Orbiter" HiWish program. The Mars Science Laboratory, named "Curiosity", launched on November 26, 2011, and reached Mars on August 6, 2012 UTC. It is larger and more advanced than the Mars Exploration Rovers, with a movement rate up to per hour. Experiments include a laser chemical sampler that can deduce the make-up of rocks at a distance of. On February 10, 2013, the "Curiosity" rover obtained the first deep rock samples ever taken from another planetary body, using its on-board drill. The same year, it discovered that Mars's soil contains between 1.5% and 3% water by mass (albeit attached to other compounds and thus not freely accessible). Observations by the "Mars Reconnaissance Orbiter" had previously revealed the possibility of flowing water during the warmest months on Mars. On September 24, 2014, Mars Orbiter Mission (MOM), launched by the Indian Space Research Organisation, reached Mars orbit. ISRO launched MOM on November 5, 2013, with the aim of analyzing the Martian atmosphere and topography. The Mars Orbiter Mission used a Hohmann transfer orbit to escape Earth's gravitational influence and catapult into a nine-month-long voyage to Mars. The mission is the first successful Asian interplanetary mission. The European Space Agency, in collaboration with Roscosmos, launched the ExoMars Trace Gas Orbiter and "Schiaparelli" lander on March 14, 2016. While the Trace Gas Orbiter successfully entered Mars orbit on October 19, 2016, "Schiaparelli" crashed during its landing attempt. In May 2018 NASA's "InSight" lander was launched, along with the twin MarCO CubeSats that will fly by Mars and provide a telemetry relay for the landing. The mission arrived at Mars in November 2018. InSight detected its first potential marsquake in April 2019. In 2019, MAVEN spacecraft mapped high-altitude global wind patterns at Mars for the first time. It was discovered that the winds which are miles above the surface retained information about the land forms below. NASA plans to launch its "Perseverance" astrobiology rover between July 17 and August 5, 2020. The rover will cache samples for future retrieval and return to Earth. The current concept for the Mars Sample Return mission would launch in 2026 and feature hardware built by NASA and ESA. The European Space Agency will launch the ExoMars rover and surface platform in July 2020. The United Arab Emirates' "Mars Hope" orbiter is planned for launch in 2020, reaching Mars orbit in 2021. The probe will make a global With the presence of various orbiters, landers, and rovers, it is possible to practice astronomy from Mars. Although Mars's moon Phobos appears about one-third the angular diameter of the full moon on Earth, Deimos appears more or less star-like, looking only slightly brighter than Venus does from Earth. Various phenomena seen from Earth have also been observed The mean apparent magnitude of Mars is +0.71 with a standard deviation of 1.05. Because the orbit of Mars is eccentric, the magnitude at opposition from the Sun can range from about −3.0 to −1.4. The minimum brightness is magnitude +1.86 when the planet is in conjunction with the Sun. At its brightest, Mars (along with Jupiter) are second only to Venus in luminosity. Mars usually appears distinctly yellow, orange, or red. NASA's "Spirit" rover has taken pictures of a greenish-brown, mud-colored landscape with blue-grey rocks and patches of light red sand. When farthest away from Earth, it is more than seven times farther away than when it is closest. When least favorably positioned, it can be lost in the Sun's glare for months at a time. At its most favorable times—at 15- or 17-year intervals, and always between late July and late September—a lot of surface detail can be seen with a telescope. Especially noticeable, even at low magnification, are the polar ice caps. As Mars approaches opposition, it begins a period of retrograde motion, which means it will appear to move backwards in a looping motion with respect to the background stars. The duration of this retrograde motion lasts for about 72 days, and Mars reaches its peak luminosity in the middle of this motion. The point at which Mars's geocentric longitude is 180° different from the Sun's is known as opposition, which is near the time of closest approach to Earth. The time of opposition can occur as much as 8.5 days away from the closest approach. The distance at close approach varies between about due to the planets' elliptical orbits, which causes comparable variation in angular size. The last Mars made its closest approach to Earth and maximum apparent brightness in nearly 60,000 years,, magnitude −2.88, on August 27, 2003, at 9:51:13 UTC. This occurred when Mars was one day from opposition and about three days from its perihelion, making it particularly easy to see from Earth. The last time it came so close is estimated to have been on September 12, 57,617 BC, the next time being in 2287. This record approach was only slightly closer than other recent close approaches. For instance, the minimum distance on August 22, 1924, was, and the minimum distance on August 24, 2208, will be. Every 15 to 17 years Mars comes into opposition near its perihelion. These perihelic oppositions make a closer approach to earth than other oppositions which occur every 2.1 years. Mars comes into perihelic opposition in 2003, 2018 and 2035, with 2020 and 2033 being close to perihelic opposition. The history of observations of Mars is marked by the oppositions of Mars, when the planet is closest to Earth and hence is most easily visible, which occur every couple of years. Even more notable are the perihelic oppositions of Mars, which occur every 15 or 17 years and are distinguished because Mars is close to perihelion, making it even closer to Earth. The ancient Sumerians believed that Mars was Nergal, the god of war and plague. During Sumerian times, Nergal was a minor deity of little significance, but, during later times, his main cult center was the city of Nineveh. In Mesopotamian texts, Mars is referred to as the "star of judgement of the fate of the dead". The existence of Mars as a wandering object in the night sky was recorded by the ancient Egyptian astronomers and, by 1534 BCE, they were familiar with the retrograde motion of the planet. By the period of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets and systematic observations of their behavior. For Mars, they knew that the planet made 37 synodic periods, or 42 circuits of the zodiac, every 79 years. They invented arithmetic methods for making minor corrections to the predicted positions of the planets. In Ancient Greek, the planet was known as. By the 19th century, the resolution of telescopes reached a level sufficient for surface features to be identified. A perihelic opposition of Mars occurred on September 5, 1877. In that year, the Italian astronomer Giovanni Schiaparelli used a telescope in Milan to help produce the first detailed map of Mars. These maps notably contained features he called "canali", which were later shown to be an optical illusion. These "canali" were supposedly long, straight lines on the surface of Mars, to which he gave names of famous rivers on Earth. His term, which means "channels" or "grooves", was popularly mistranslated in English as "canals". Influenced by the observations, the orientalist Percival Lowell founded an observatory which had telescopes. The observatory was used for the Once spacecraft visited the planet during NASA's Mariner missions in the 1960s and 70s, these concepts were radically broken. The results of the Viking life-detection experiments aided an intermission in which the hypothesis of a hostile, dead planet was generally accepted. Mariner 9 and Viking allowed better maps of Mars to be made using the data from these missions, and another Mars is named after the Roman god of war. In different cultures, Mars represents masculinity and youth. Its symbol, a circle with an arrow pointing out to the upper right, is used as a symbol for the male gender. The many failures in Mars exploration probes resulted in a satirical counter-culture blaming the failures on an Earth-Mars "Bermuda Triangle", a "Mars Curse", or a "Great Galactic Ghoul" that feeds on Martian spacecraft. The fashionable idea that Mars was populated by intelligent Martians exploded in the late 19th century. Schiaparelli's "canali" observations combined with Percival Lowell's books on the subject put forward the standard notion of a planet that was a drying, cooling, dying world with ancient civilizations constructing irrigation works. Many other observations and proclamations by notable personalities added to what has been termed "Mars Fever". In 1899, while investigating atmospheric radio noise using his receivers in his Colorado Springs lab, inventor Nikola Tesla observed repetitive signals that he later surmised might have been radio communications coming from another planet, possibly Mars. In a 1901 interview Tesla said: It was some time afterward when the thought flashed upon my mind that the disturbances I had observed might be due to an intelligent control. Although I could not decipher their meaning, it was impossible for me to think of them as having been entirely accidental. The feeling is constantly growing on me that I had been the first to hear the greeting of one planet to another. Tesla's theories gained support from Lord Kelvin who, while visiting the United States in 1902, was reported to have said that he thought Tesla had picked up Martian signals being sent to the United States. Kelvin "emphatically" denied this report shortly before leaving: "What I really said was that the inhabitants of Mars, if there are any, were doubtless able to see New York, particularly the glare of the electricity." In a "New York Times" article in 1901, Edward Charles Pickering, director of the Harvard College Observatory, said that they had received a telegram from Lowell Observatory in Arizona that seemed to confirm that Mars was trying to communicate with Earth. Early in December 1900, we received from Lowell Observatory in Arizona a telegram that a shaft of light had been seen to project from Mars (the Lowell observatory makes a specialty of
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being only larger than Mercury. In English, Mars carries the name of the Roman god of war and is often referred to as the "Red Planet". The latter refers to the effect of the iron oxide prevalent on Mars' surface, which gives it a reddish appearance distinctive among the astronomical bodies visible to the naked eye. Mars is a terrestrial planet with a thin atmosphere, with surface features reminiscent of the impact craters of the Moon and the valleys, deserts and polar ice caps of Earth.
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summarize: The modern English word "Earth" developed, via Middle English, from an Old English noun most often spelled '. It has cognates in every Germanic language, and their ancestral root has been reconstructed as *"erþō". In its earliest attestation, the word "eorðe" was already being used to translate the many senses of Latin'and Greek "gē": the ground, its soil, dry land, the human world, the surface of the world (including the sea), and the globe itself. As with Roman Terra/Tellūs and Greek Gaia, Earth may have been a personified goddess in Germanic paganism: late Norse mythology included Jörð ('Earth'), a giantess often given as the mother of Thor. Originally, "earth" was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as "the earth". By Early Modern English, many nouns were capitalized, and "the earth" became (and often remained) "the Earth", particularly when The oldest material found in the Solar System is dated to (BYA). By the primordial Earth had formed. The bodies in the Solar System formed and evolved with the Sun. In theory, a solar nebula partitions a volume out of a molecular cloud by gravitational collapse, which begins to spin and flatten into a circumstellar disk, and then the planets grow out of that disk with the Sun. A nebula contains gas, ice grains, and dust (including Earth's atmosphere and oceans were formed by volcanic activity and outgassing. Water vapor from these sources condensed into the oceans, augmented by water and ice from asteroids, protoplanets, and comets. In this model, atmospheric "greenhouse gases" kept the oceans from freezing when the newly forming Sun had only 70% of its current luminosity. By, Earth's magnetic field was established, which helped prevent the atmosphere from being stripped away by the solar wind. A crust formed when the molten outer layer of Earth cooled to form a solid. The Chemical reactions led to the first self-replicating molecules about four billion years ago. A half billion years later, the last common ancestor of all current life arose. The evolution of photosynthesis allowed the Sun's energy to be harvested directly by life forms. The resultant molecular oxygen () accumulated in the atmosphere and due to interaction with ultraviolet solar radiation, formed a protective ozone layer () in the upper atmosphere. The incorporation of smaller cells within larger ones resulted in the development of complex cells called eukaryotes. True multicellular organisms formed as cells within colonies became increasingly specialized. Aided by the absorption of harmful ultraviolet radiation by the ozone layer, life colonized Earth's surface. Among the earliest fossil evidence for life is microbial mat fossils found in 3.48 billion-year-old sandstone in Western Australia, biogenic graphite found in 3.7 billion-year-old Earth's expected long-term future is tied to that of the Sun. Over the next, solar luminosity will increase by 10%, and over the next by 40%. Earth's increasing surface temperature will accelerate the inorganic carbon cycle, reducing concentration to levels lethally low for plants ( for C4 photosynthesis) in approximately. The lack of vegetation will result in the loss of oxygen in the atmosphere, making animal life impossible. About a billion years from now, all surface water will have disappeared and the mean global temperature will reach. Earth is expected to be habitable until the end of photosynthesis about from now, but if nitrogen is removed from the atmosphere, life may The shape of Earth is nearly spherical. There is a small flattening at the poles and bulging around the equator due to Earth's rotation. To second order, Earth is approximately an oblate spheroid, whose equatorial diameter is larger than the pole-to-pole diameter, although the variation is less than 1% of the average radius of the Earth. The point on the surface farthest from Earth's center of mass is the summit Earth's mass is approximately (5,970 Yg). It is composed mostly of iron (32.1%), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulphur (2.9%), nickel (1.8%), calcium (1.5%), and aluminum (1.4%), with the remaining 1.2% consisting of trace amounts of other elements. Due to mass segregation, the core region is estimated to be Earth's interior, like that of the other terrestrial planets, is divided into layers by their chemical or physical (rheological) properties. The outer layer is a chemically distinct silicate solid crust, which is underlain by a highly viscous solid mantle. The crust is separated from the mantle by the Mohorovičić discontinuity. The thickness of the crust varies from about under the oceans to for the continents. The crust and the cold, rigid, top of the Earth's internal heat comes from a combination of residual heat from planetary accretion (about 20%) and heat produced through radioactive decay (80%). The major heat-producing isotopes within Earth are potassium-40, uranium-238, and thorium-232. At the center, the temperature may be up to, and the pressure could reach. Because much of the heat is provided by radioactive decay, scientists postulate that early in Earth's history, before isotopes with short half-lives were depleted, Earth's heat production was much higher. At approximately, twice the present-day heat Earth's mechanically rigid outer layer, the lithosphere, is divided into tectonic plates. These plates are rigid segments that move relative to each other at one of three boundaries types: At convergent boundaries, two plates come together; at divergent boundaries, two plates are pulled apart; and at transform boundaries, two plates slide past one another laterally. Along these plate boundaries, earthquakes, volcanic activity, mountain-building, and oceanic trench formation can occur. The tectonic plates ride on top of the asthenosphere, the solid but less-viscous part of the upper mantle that can flow and move along with the plates. As the tectonic plates migrate, oceanic crust is subducted under the leading edges of The total surface area of Earth is about. Of this, 70.8%, or, is below sea level and covered by ocean water. Below the ocean's surface are much of the continental shelf, mountains, volcanoes, oceanic trenches, submarine canyons, oceanic plateaus, abyssal plains, and a globe-spanning mid-ocean ridge system. The remaining 29.2%, or, not covered by water has terrain that varies greatly from place to place and consists of mountains, deserts, plains, plateaus, and other landforms. Tectonics and erosion, volcanic eruptions, flooding, weathering, glaciation, the growth of coral reefs, and meteorite impacts are among the processes that constantly reshape Earth's surface over geological time. The continental crust consists of lower density material such as the igneous rocks granite and andesite. Less common is basalt, a denser volcanic The abundance of water on Earth's surface is a unique feature that distinguishes the "Blue Planet" from other planets in the Solar System. Earth's hydrosphere consists chiefly of the oceans, but technically includes all water surfaces in the world, including inland seas, lakes, rivers, and underground waters down to a depth of. The deepest underwater location is Challenger Deep of the Mariana Trench in the Pacific Ocean with a depth of. The mass of the oceans is approximately 1.35 metric tons or about 1/4400 of Earth's total mass. The oceans cover an area of with a mean depth of The atmospheric pressure at Earth's sea level averages, with a scale height of about. A dry atmosphere is composed of 78.084% nitrogen, 20.946% oxygen, 0.934% argon, and trace amounts of carbon dioxide and other gaseous molecules. Water vapor content varies between 0.01% and 4% but averages about 1%. The height of the troposphere varies with latitude, ranging between at the poles to at the equator, with some variation resulting from weather and seasonal factors. Earth's biosphere has significantly altered its atmosphere. Oxygenic photosynthesis evolved, forming the primarily nitrogen–oxygen atmosphere of today. This change enabled the proliferation of aerobic organisms and, Earth's atmosphere has no definite boundary, slowly becoming thinner and fading into outer space. Three-quarters of the atmosphere's mass is contained within the first of the surface. This lowest layer is called the troposphere. Energy from the Sun heats this layer, and the surface below, causing expansion of the air. This lower-density air then rises and is replaced by cooler, higher-density air. The result is atmospheric circulation that drives the weather and climate through redistribution of thermal energy. The primary atmospheric circulation bands consist of the trade winds in the equatorial region below 30° latitude and the westerlies in the mid-latitudes between 30° and 60°. Ocean currents are also important factors in determining climate, particularly the thermohaline circulation that distributes thermal energy from the equatorial oceans to the polar regions. Water vapor generated through surface evaporation is transported by circulatory patterns in the atmosphere. When atmospheric conditions permit an uplift of warm, humid air, this water condenses and falls to the surface as precipitation. Most of the water is then transported to lower elevations by river systems and usually returned to the Above the troposphere, the atmosphere is usually divided into the stratosphere, mesosphere, and thermosphere. Each layer has a different lapse rate, defining the rate of change in temperature with height. Beyond these, the exosphere thins out into the magnetosphere, where the geomagnetic fields interact with the solar wind. Within the stratosphere is the ozone layer, a component that partially shields the surface from ultraviolet light and thus is important for life on Earth. The Kármán line, defined as 100 km above Earth's surface, is a working definition for the boundary between the atmosphere and outer space. Thermal energy causes some of the molecules at the outer edge of the atmosphere The gravity of Earth is the acceleration that is imparted to objects due to the distribution of mass within Earth. The main part of Earth's magnetic field is generated in the core, the site of a dynamo process that converts the kinetic energy of thermally and compositionally driven convection into electrical and magnetic field energy. The field extends outwards from the core, through the mantle, and up to Earth's surface, where it is, approximately, a dipole. The poles of the dipole are located close to Earth's geographic poles. At the equator of the magnetic field, the magnetic-field strength at the surface is, with a magnetic dipole moment of at epoch 2000, decreasing nearly 6% per century. The convection movements in the core are chaotic; the magnetic poles drift and periodically change alignment. This causes secular variation of the main field and field reversals at irregular intervals averaging a few times every million years. The most recent reversal occurred approximately 700,000 years ago. The extent of Earth's magnetic field in space defines the magnetosphere. Ions and electrons of the solar wind are deflected by the magnetosphere; solar wind pressure compresses the dayside of the magnetosphere, to about 10 Earth radii, and extends the nightside magnetosphere into a long tail. Because the velocity of the solar wind is greater than the speed at which waves propagate through the solar wind, a supersonic bow shock precedes the dayside magnetosphere within the solar wind. Charged particles are contained within the magnetosphere; the plasmasphere is defined by low-energy particles that essentially follow magnetic field lines as Earth rotates; the ring current is defined by medium-energy particles that drift relative to the geomagnetic field, but with paths that are still dominated by the magnetic field, and the Van Allen radiation belt are formed by high-energy particles whose motion is essentially random, but otherwise contained by the magnetosphere. During magnetic storms and substorms, charged particles can be deflected from the outer magnetosphere and especially the magnetotail, directed along field lines into Earth's ionosphere, where atmospheric atoms can be excited and ionized, causing the aurora. Earth's rotation period relative to the Sun—its mean solar day—is of mean solar time (). Because Earth's solar day is now slightly longer than it was during the 19th century due to tidal deceleration, each day varies between longer. Earth's rotation period relative to the fixed stars, called its "stellar day" by the International Earth Rotation and Reference Systems Service (IERS), is of mean solar time (UT1), or Earth's rotation period relative to the precessing or moving Earth orbits the Sun at an average distance of about every 365.2564 mean solar days, or one sidereal year. This gives an apparent movement of the Sun eastward with respect to the stars at a rate of about 1°/day, which is one apparent Sun or Moon diameter every 12 hours. Due to this motion, on average it takes 24 hours—a solar day—for Earth to complete a full rotation about its axis so that the Sun returns to the meridian. The orbital speed of Earth averages about, which is fast enough to travel a distance equal to Earth's diameter, about, in seven minutes, and the distance to the Moon,, in about 3.5 hours. The Moon and Earth orbit a common barycenter every 27.32 days relative to the background stars. When combined with the Earth–Moon system's The axial tilt of Earth is approximately 23.439281° with the axis of its orbit plane, always pointing towards the Celestial Poles. Due to Earth's axial tilt, the amount of sunlight reaching any given point on the surface varies over the course of the year. This causes the seasonal change in climate, with summer in the Northern Hemisphere occurring when the Tropic of Cancer is facing the Sun, and winter taking place when the Tropic of Capricorn in the Southern Hemisphere faces the Sun. During the summer, the day lasts longer, and the Sun climbs higher in the sky. In winter, A planet that can sustain life is termed habitable, even if life did not originate there. Earth provides liquid water—an environment where complex organic molecules can assemble and interact, and sufficient energy to sustain metabolism. The distance of Earth from the Sun, as well as its orbital eccentricity, rate of rotation, axial tilt, geological history, sustaining atmosphere, and magnetic field all contribute to the current climatic conditions at the surface. A planet's life forms inhabit ecosystems, whose total is sometimes said to form a "biosphere". Earth's biosphere is thought to have begun evolving about. The biosphere is divided into a number of biomes, inhabited by broadly similar plants and animals. On land, biomes are separated primarily Earth has resources that have been exploited by humans. Those termed non-renewable resources, such as fossil fuels, only renew over geological timescales. Large deposits of fossil fuels are obtained from Earth's crust, consisting of coal, petroleum, and natural gas. These deposits are used by humans both for energy production and as feedstock for chemical production. Mineral ore bodies have also been formed within the crust through a process of ore genesis, Large areas of Earth's surface are subject to extreme weather such as tropical cyclones, hurricanes, or typhoons that dominate life in those areas. From 1980 to 2000, these events caused an average of 11,800 human deaths per year. Many places are subject to earthquakes, landslides, tsunamis, volcanic eruptions, tornadoes, sinkholes, blizzards, floods, droughts, wildfires, and other calamities and Cartography, the study and practice of map-making, and geography, the study of the lands, features, inhabitants and phenomena on Earth, have historically been the disciplines devoted to depicting Earth. Surveying, the determination of locations and distances, and to a lesser extent navigation, the determination of position and direction, have developed alongside cartography and geography, providing and suitably quantifying the requisite information. Earth's human population reached approximately seven billion on 31 October 2011. Projections indicate that the world's human population will reach 9.2 billion in 2050. Most of the growth is expected to take place in developing nations. Human population density varies widely around the world, but a majority live in Asia. By 2020, 60% of the world's population is expected to be living in urban, rather than rural, areas. 68% of the land mass of the world is in the northern hemisphere. Partly due to the predominance of land mass, 90% of humans live in the northern hemisphere. It is estimated that one-eighth of Earth's surface is suitable for humans to live on – three-quarters of Earth's surface is covered The Moon is a relatively large, terrestrial, planet-like natural satellite, with a diameter about one-quarter of Earth's. It is the largest moon in the Solar System relative to the size of its planet, although Charon is larger relative to the dwarf planet Pluto. The natural satellites of other planets are also referred to as "moons", after Earth's. The gravitational attraction between Earth and the Moon causes tides on Earth. The same effect on the Moon has led to its tidal locking: its rotation period is the same as the time it takes to orbit Earth. As a result, it always presents the same face to the planet. As the Moon orbits Earth, different parts of its face are illuminated by the Sun, leading to the lunar phases; the dark part of the face is separated from the light part by the solar terminator. Due to their tidal interaction, the Moon recedes from Earth at the rate of approximately. Earth has at least five co-orbital asteroids, including 3753 Cruithne and. A trojan asteroid companion,, is librating around the leading Lagrange triangular point, L4, in Earth's orbit around the Sun. The tiny near-Earth asteroid makes close approaches The standard astronomical symbol of Earth consists of a cross circumscribed by a circle,, representing the four corners of the world. Human cultures have developed many views of the planet. Earth is sometimes personified as a deity. In many cultures it is a mother goddess that is also the primary fertility deity, and by the mid-20th century, the Gaia Principle compared Earth's environments and life as a single self-regulating organism leading to broad stabilization of the conditions of habitability. Creation myths in many religions involve the creation of Earth by a supernatural deity or deities. Scientific investigation has resulted in several culturally transformative shifts in people's view of the planet. Initial belief in a flat Earth was gradually displaced in the Greek colonies of southern Italy during the late 6th century BC by the idea of spherical Earth, which was attributed to </math>, where "m" is the mass of Earth, "a" is an astronomical unit, and "M" is the mass of the Sun. So the radius in AU is about formula_1.</ref
Earth is the third planet from the Sun and the only astronomical object known to harbor life. According to radiometric dating estimation and other evidence, Earth formed over 4.5 billion years ago. Earth's gravity interacts with other objects in space, especially the Sun and the Moon, which is Earth's only natural satellite. Earth orbits around the Sun in 365.256 solar days, a period known as an Earth sidereal year. During this time, Earth rotates about its axis 366.256 times, that is, a sidereal year has 366.256 sidereal days.
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summarize: The 7 stories are as follows: A Film Story playing from spring to winter and covering 80 years of human life. Seven dramatic human life stories that may play anywhere and in any century. They tell the everlasting story of passion, love desire, obsession and selfiness. The whole story, the Ballads were written by Czech poet Karel Jaromír Erben a century ago and yet they are still here and alive. Therefore, the authors of the movie decided to choose seven of the ballads and make them a film poetry of a very new style. It is a composition of photography, music and fascinating landscape and architecture. The first ballad – Wild Flowers - is full of emotions and opens the whole world of different feelings and emotions of the human being as well as fairy tale creatures. It carries the name Bouquet and tells a story of little orphans crying for their mother. The mother hears their cries and prayers and comes back to them in the form of a little flower. The Waterman is a fascinating slightly horror story about a waterman who falls in love with a country girl. Most of the scenes are shot really in the water and make this very authentic. It is again an eternal story about love, passion, different aspects of motherhood and discrimination. The Noon-Day witch is tells of a desperate, tired mother and a greedy old noon witch. The mother is frustrated when her child is noisy and bothering her in every respect, therefore she calls the witch to give the boy a lesson - however she regrets her desperate deed immediately, its consequences are irretrievable. The Wedding Dress is a romantic horror played between our world and the world of the dead. The Daughter's Curse is in fact an unfortunate misunderstanding between two different generations. It deals again of the often complicated mother-daughter relationship, especially when the daughter is handicapped and the mother wants “the best” for the poor child. In the end the daughter cannot cope with the freedom and curses her mother. The Golden Spinning Wheel is a colourful story about the confusing similarity of faces when characters are totally different. It is a great opportunity for one actress who plays both the good and the wicked girl. However the bad ones get punished and the good ones are rewarded as in any good fairy tale. The photography uses the beautiful colours of the fall and the beauty of the landscape. The last ballad The Christmas Day is closing the circle of a human life in the person of an old woman who accepts her death as a natural ending of her life. She feels in peace with God and her fellow people and knows that she didn't live in vain. The persons of individual stories keep meeting in between their ballads as on a merry-go round. It is a great poetry composed of pictures, music and words that accompanies us home and makes us ponder over the sense of life and death, love and hate, tolerance and discrimination, tenderness and wild passion for a long time.
Wild Flowers () is a Czech drama film released in 2000. It was directed by and based on seven poems from "Kytice", a collection of ballads by Karel Jaromír Erben. While relatively successful commercially, the film was deplored by critics for its crude literalism of depiction.
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summarize: The film starts with the image of a mechanism beginning to work - as the gears move (behind the scenes), the sun slowly rises up over a town and a new day begins. The town, Hamelin, is shown to be one which is full of corrupted petty people, where everything is wasted and money and social rank are the first priority. The waste leads to an enormous rat infestation at night that spills out into the streets the next day. As the town leaders meet to decide on the best course of action, a stranger appears in the doorway - a hooded piper who demonstrates that with the sound of his playing he can entice rats to their deaths. The town leaders are delighted and offer him 1000 gold coins as payment if he would get rid of all of the town's rats. The piper accepts and begins walking through the city, drawing all of the rats behind him. At the same time, a jeweler, who was among the elite group of leaders, walks into a woman's home and tries to seduce her. The woman (who is the only character who doesn't look grotesque, implying innocence) refuses. The jeweler persists, but before he can do anything the piper passes by her house and at the sound of the music the jeweler is forced to jump out of the window. After all of the rats plunge off a cliff-side tower into a lake, the piper comes back into town, on the way once again preventing the jeweler's advances on the woman. The piper and the woman sit on a bench together as he plays a beautiful melody that is accompanied by paint-on-wood animation (a complete change of style from the rest of the film). Finally, the piper goes to collect his promised payment. The town leaders (who are in the middle of gorging themselves on food and wine and among whom is the jeweler seen drinking and telling his sad tale of rejection to his friends) give him only a black button. The piper leaves angrily. That night, the jeweler and his drunken friends break into the woman's house as she is praying, rape and murder her (this is implied rather than shown). The piper comes, but this time he is too late - all that he can do is close the eyes of her horrified face. Now the piper climbs up the highest tower in the town, to the top floor where the machinery for the sun that we saw in the introduction is located. At the very top is the god Saturn, holding an hourglass. The piper and Saturn have a silent conversation, and a decision is made. All of the sand in Saturn's hourglass runs out, and the gears that make the sun rise stop working. As the now-silent day begins, the piper begins to play his pipe and leaves the tower. As he walks through the streets and the citizens hear him, they turn into rats and follow the sound, eventually jumping off the tower just as the rats did previously, the transformed jeweler being the last to jump. The only person left is an old fisherman (who has been seen watching the city from far off earlier in the film) who comes to watch. When he gets close to the piper, however, the piper ceases to exist - his cloak, now empty of a physical being inside it, is blown away with the wind. The fisherman walks through the now-empty city and finds a baby (who is still uncorrupted) in one of the houses. He takes the baby away with him and leaves the town. "The Pied Piper" was an unusually ambitious project for the production company Kratky Film, which like other animation studios in Czechoslovakia primarily made television short films for children. Research for the film took six months. Director Jiří Barta's aim was to make an adaptation of the "Pied Piper of Hamelin" which captured the German spirit, and which had to be suitable for animation. The film's narrative therefore took traits from several alterations of the myth, but mainly stayed true to the version presented in the novel "Krysař" by Viktor Dyk. Writing the screenplay and doing technical preparations took one year. The art design was based on German Expressionism and medieval German art conventions. Barta said: "This element has actually solved certain spatial problems in that part of the mediaeval canon is that the important figures are big, and secondary figures are small. So it has solved the whole problem of space, and justifies an illogicality – a lack of logic – about the world of the film." Barta designed the puppets and sets himself. He started with drawings and then made models to provide three dimensions. The puppets were intentionally designed as to appear mechanical, which would contrast with the use of living rats, to create the impression that the rats were more alive than the humans. The exceptions were the characters Agnes and the fisherman, who were given a softer design to represent a world of purity. The puppets varied in size between one and 60 centimeters. One scene in the film features two-dimensional animation in a style radically different from the rest. This segment was inspired by medieval painting on wood, and in particular the art of Jan van Eyck. Filming took one year and after that the sound was added in post-production. The language spoken in the film is fictitious and not supposed to be literally understood by anybody. According to Barta, the language was "somewhat based on German, but the main emphasis was on the rhythm and the onomatopoeic quality of the language." Voice acting was provided by Oldřich Kaiser, Jiří Lábus, Michal Pavlíček and Vilém Čok. The film was screened in the Un Certain Regard section of the 1986 Cannes Film Festival. Its Czechoslovak premiere was on 1 September the same year. An NTSC R1 DVD of Jiří Barta's films called "Jiri Barta: Labyrinth of Darkness" was released by Kino Video on 12 September 2006. The DVD contains most of Barta's filmography (this film and: "A Ballad About Green Wood", "The Club of the Laid Off", "The Design", "Disc Jockey", "The Last Theft", "Riddles for a Candy", "The Vanished World of Gloves"). The other films range from 6 to 24 minutes in length. The DVD features the original Czech soundtracks with English subtitles. Other DVDs featuring the film include a Japanese version of the abovementioned release, as well as a French release from Doriane Films which has only this. A Czech DVD was released on 26 August 2009. Critical reception for the film has been very positive. "Jamie S. Rich" from DVD Talk gave the film a positive review stating, "I wholeheartedly enjoyed the skewed vision of Jiri Barta, even if the DVD production did not match the level of his craft. One can only hope that someday there will be a much better version of Jiri Barta: Labyrinth of Darkness that will restore his gorgeous animation to its full glory, so that we can see treasures like The Pied Piper of Hamelin and The Vanished World of Gloves as they were intended. In the meantime, you shouldn't go without looking in on a world unmatched in its creativity". Time Out Magazine praised the film calling it, "An impressive film, notable not only for its richly imaginative juxtapositions of visual textures, but for its resolutely grotesque account of a society's lemming-like race towards self-annihilation". Jens Adian from German film review website "Treffpunkt.com" praised the film stating, "The handmade animation makes Krysar together with the gloomy appearance of the characters and the versatile techniques that incorporate the filmmakers have in the creation of a visually stunning film". Keith Allen from "Movie Rapture.com" gave the film a positive review stating, "Instead of attempting to fool us into becoming involved with persons portrayed as though they were individuals such as ourselves, Barta creates a land that exists independently of our own universe, one that so envelopes the viewer that he can forget about his own existence and submerge himself in his experience of watching the film. The director has truly created a powerful, evocative masterpiece".
The Pied Piper is a 1986 Czechoslovak animated fantasy film directed by Jiří Barta. Its original Czech title is Krysař, which means "The rat catcher". The story is an adaptation of the "Pied Piper of Hamelin", a fairy tale originated in medieval Germany. The film was one of Czechoslovakia's most ambitious animation projects of the 1980s, notable for its unusual dark art direction, innovative animation techniques and use of a fictitious language. The art design was heavily inspired by German Expressionism and medieval art. The film was screened in the Un Certain Regard section the 1986 Cannes Film Festival.
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summarize: Some of the earliest recorded observations ever made through a telescope, Galileo's drawings on 28 December 1612 and 27 January 1613 contain plotted points that match up with what is now known to be the position of Neptune. On both occasions, Galileo seems to have mistaken Neptune for a fixed star when it appeared close—in conjunction—to Jupiter in the night sky; hence, he is not credited with Neptune's discovery. At his first observation in December 1612, Neptune was almost stationary in the sky because it had just turned retrograde that day. This Shortly after its discovery, Neptune was referred to simply as "the planet exterior to Uranus" or as "Le Verrier's planet". The first suggestion for a name came from Galle, who proposed the name "Janus". In England, Challis put forward the name "Oceanus". Claiming the right to name his discovery, Le Verrier quickly proposed the name "Neptune" for this new planet, though falsely stating that this had been officially approved by the French Bureau des Longitudes. In October, he sought to name the planet "Le Verrier", after himself, and he had loyal support in this from the observatory director, François Arago. This suggestion met with stiff resistance outside France. French almanacs quickly reintroduced the name "Herschel" for Uranus, after that planet's discoverer Sir William Herschel, and "Leverrier" for the new planet. Struve came out in favour of the name "Neptune" on 29 December 1846, to the Saint Petersburg Academy of Sciences. Soon, "Neptune" became the internationally accepted name. In Roman mythology, Neptune was the god From its discovery in 1846 until the discovery of Pluto in 1930, Neptune was the farthest known planet. When Pluto was discovered, it was considered a planet, and Neptune thus became the second-farthest known planet, except for a 20-year period between 1979 and 1999 when Pluto's Neptune's mass of 1.0243 kg is intermediate between Earth and the larger gas giants: it is 17 times that of Earth but just 1/19th that of Jupiter. Its gravity at 1 bar is 11.15 m/s, 1.14 times the surface gravity of Earth, and surpassed only by Jupiter. Neptune's equatorial radius of 24,764 km is nearly four times that of Earth. Neptune, like Uranus, is an ice giant, a subclass of giant planet, because they are smaller and have higher concentrations of volatiles than Jupiter and Saturn. In the search for extrasolar planets, Neptune has been used as a metonym: discovered bodies of similar mass are often referred to as "Neptunes", just as scientists refer to various extrasolar bodies as "Jupiters". Neptune's internal structure resembles that of Uranus. Its atmosphere forms about 5% to 10% of its mass and extends perhaps 10% to 20% of the way towards the core, where it reaches pressures of about 10 GPa, or about 100,000 times that of Earth's atmosphere. Increasing concentrations of methane, ammonia and water are found in the lower regions of the atmosphere. The mantle is equivalent to 10 to 15 Earth masses and is rich in water, ammonia and methane. As is customary in planetary science, this mixture is referred to as icy even though it is a hot, dense fluid. This fluid, which has a high electrical conductivity, is sometimes At high altitudes, Neptune's atmosphere is 80% hydrogen and 19% helium. A trace amount of methane is also present. Prominent absorption bands of methane exist at wavelengths above 600 nm, in the red and infrared portion of the spectrum. As with Uranus, this absorption of red light by the atmospheric methane is part of what gives Neptune its blue hue, although Neptune's vivid azure differs from Uranus's milder cyan. Because Neptune's atmospheric methane content is similar to that of Uranus, some unknown atmospheric constituent is thought to contribute to Neptune's colour. Neptune's atmosphere is subdivided into two main regions: the lower troposphere, where temperature decreases with altitude, and the stratosphere, where temperature increases with altitude. The boundary between the two, the tropopause, lies at a pressure of. The stratosphere then gives way to the thermosphere at a pressure lower than 10 to 10 bars (1 to 10 Pa). The thermosphere gradually transitions to the exosphere. Models suggest that Neptune's troposphere is banded by clouds of varying compositions depending on altitude. The upper-level clouds lie at pressures below one bar, where the temperature is suitable for methane to condense. For pressures between Neptune resembles Uranus in its magnetosphere, with a magnetic field strongly tilted relative to its rotational axis at 47° and offset at least 0.55 radii, or about 13,500 km from the planet's physical centre. Before "Voyager 2" arrival at Neptune, it was hypothesised that Uranus's tilted magnetosphere was the result of its sideways rotation. In comparing the magnetic fields of the two planets, scientists now think the extreme orientation may be characteristic of flows in the planets' interiors. This field may be generated by convective fluid motions in a thin spherical shell of electrically conducting liquids (probably a combination of ammonia, methane and water) resulting in a dynamo action. The dipole component of the magnetic Neptune's weather is characterised by extremely dynamic storm systems, with winds reaching speeds of almost —nearly reaching supersonic flow. More typically, by tracking the motion of persistent clouds, wind speeds have been shown to vary from 20 m/s in the easterly direction to 325 m/s westward. At the cloud tops, the prevailing winds range in speed from 400 m/s along the equator to 250 m/s at the poles. Most of the winds on Neptune move in a direction opposite the planet's rotation. The general pattern of winds showed prograde rotation at high latitudes vs. retrograde rotation at lower latitudes. The difference in flow direction is thought to be a "skin effect" and not due to any deeper atmospheric processes. At 70° S latitude, a high-speed jet travels at a speed of 300 m/s. Neptune differs from Uranus in its typical level of meteorological activity. "Voyager 2" observed weather phenomena on Neptune during its 1989 flyby, but no comparable phenomena on Uranus during its 1986 fly-by. The abundance of methane, ethane and acetylene at Neptune's equator is 10–100 times greater than at the poles. This is interpreted as evidence for upwelling at the equator and subsidence near the poles because photochemistry cannot account for the distribution without meridional circulation. In 2007, it was discovered that the upper troposphere of Neptune's south pole was about 10 K warmer than the rest of its atmosphere, which averages approximately. The temperature differential is enough to let methane, which elsewhere is frozen in the troposphere, escape into the stratosphere near the pole. The relative "hot spot" is due to Neptune's axial tilt, which has exposed the south pole to the Sun for the last quarter of Neptune's year, or roughly 40 Earth years. As Neptune slowly moves towards the opposite side of the Sun, the south pole will be darkened and the north pole illuminated, causing the methane release to shift to the north pole. Because of seasonal changes, the cloud bands in the southern hemisphere of Neptune have been observed to increase in size and albedo. This trend was first seen in 1980 and is expected to last until about 2020. The long orbital period of Neptune results in seasons lasting forty years. In 1989, the Great Dark Spot, an anti-cyclonic storm system spanning 13,000 × 6,600 km, was discovered by NASA's "Voyager 2" spacecraft. The storm resembled the Great Red Spot of Jupiter. Some five years later, on 2 November 1994, the Hubble Space Telescope did not see the Great Dark Spot on the planet. Instead, a new storm similar to the Great Dark Spot was found in Neptune's northern hemisphere. The Scooter is another storm, a white cloud group farther south than the Great Dark Spot. This nickname first arose during the months leading up to the "Voyager 2" encounter in 1989, when they were observed moving at speeds faster than the Great Dark Spot (and images Neptune's more varied weather when compared to Uranus is due in part to its higher internal heating. The upper regions of Neptune's troposphere reach a low temperature of. At a depth where the atmospheric pressure equals, the temperature is. Deeper inside the layers of gas, the temperature rises steadily. As with Uranus, the source of this heating is unknown, but the discrepancy is larger: Uranus only radiates 1.1 times as much The average distance between Neptune and the Sun is (about 30.1 astronomical units (AU)), and it completes an orbit on average every 164.79 years, subject to a variability of around ±0.1 years. The perihelion distance is 29.81 AU; the aphelion distance is 30.33 AU. On 11 July 2011, Neptune completed its first full barycentric orbit since its discovery in 1846, although it did not appear at its exact discovery position in the sky, because Earth was in a different location in its 365.26-day orbit. Because of the motion of the Sun in relation to the barycentre of the Solar System, on 11 July Neptune was also not at its exact discovery position in relation to the Sun; if the more common heliocentric coordinate system is used, the discovery longitude was reached on 12 July 2011. The elliptical orbit of Neptune is inclined 1.77° compared to that of Earth. The axial tilt of Neptune is 28.32°, which is similar to the tilts of Earth (23°) and Mars (25°). As a result, Neptune experiences similar seasonal changes to Earth. The long orbital period of Neptune means that the seasons last for forty Earth years. Its sidereal rotation period (day) is roughly 16.11 hours. Because its axial tilt is comparable to Earth's, the variation in the length of its day over the course of its long year is not any more extreme. Because Neptune is not a solid body, its atmosphere undergoes differential rotation. The wide equatorial zone rotates with a period of about 18 hours, which is slower than the 16.1-hour rotation of the planet's magnetic field. By contrast, the reverse is true for the polar regions where the rotation period is 12 hours. This differential rotation is the most pronounced of any planet in the Solar System, and it results in strong latitudinal wind shear. Neptune's orbit has a profound impact on the region directly beyond it, known as the Kuiper belt. The Kuiper belt is a ring of small icy worlds, similar to the asteroid belt but far larger, extending from Neptune's orbit at 30 AU out to about 55 AU from the Sun. Much in the same way that Jupiter's gravity dominates the asteroid belt, shaping its structure, so Neptune's gravity dominates the Kuiper belt. Over the age of the Solar System, certain regions of the Kuiper belt became destabilised by Neptune's gravity, creating gaps in the Kuiper belt's structure. The region between 40 and 42 AU is an example. There do exist orbits within these empty regions where objects can survive for the age of the Solar System. These resonances occur when Neptune's orbital period is a precise fraction of that of The formation of the ice giants, Neptune and Uranus, has proven difficult to model precisely. Current models suggest that the matter density in the outer regions of the Solar System was too low to account for the formation of such large bodies from the traditionally accepted method of core accretion, and various hypotheses have been advanced to explain their formation. One is that the ice giants were not formed by core accretion but from instabilities within the original Neptune has 14 known moons. Triton is the largest Neptunian moon, comprising more than 99.5% of the mass in orbit around Neptune, and it is the only one massive enough to be spheroidal. Triton was discovered by William Lassell just 17 days after the discovery of Neptune itself. Unlike all other large planetary moons in the Solar System, Triton has a retrograde orbit, indicating that it was captured rather than forming in place; it was probably once a dwarf planet in the Kuiper belt. It is close enough to Neptune to be locked into a synchronous rotation, and it is slowly spiralling inward because of tidal acceleration. It will eventually be torn apart, in about 3.6 billion years, when it reaches the Roche limit. In 1989, Triton was the coldest object that had yet been measured in the Solar System, with estimated temperatures of. Neptune's second known satellite (by order of discovery), the irregular moon Nereid, has one of the most eccentric orbits of any satellite in the Solar System. The eccentricity of 0.7512 gives it an apoapsis that is seven times its periapsis distance from Neptune. From July to September 1989, "Voyager 2" discovered six moons of Neptune. Of these, the irregularly shaped Proteus is notable for being as large as a body of its density can be without being pulled into a spherical shape by its own gravity. Although the second-most-massive Neptunian moon, it is only 0.25% the mass of Triton. Neptune's innermost four moons—Naiad, Thalassa, Despina and Galatea—orbit close enough to be within Neptune's rings. The next-farthest out, Larissa, was originally discovered in 1981 when it had occulted a star. This occultation had been attributed to ring arcs, but when "Voyager 2" observed Neptune in 1989, Larissa was found to have caused it. Five new irregular moons discovered between 2002 and 2003 were announced in 2004. A new moon and the smallest yet, Hippocamp, was found in 2013 by combining multiple Hubble images. Because Neptune was the Roman god of the sea, Neptune's moons have been named after lesser sea gods. Neptune has a planetary ring system, though one much less substantial than that of Saturn. The rings may consist of ice particles coated with silicates or carbon-based material, which most likely gives them a reddish hue. The three main rings are the narrow Adams Ring, 63,000 km from the centre of Neptune, the Le Verrier Ring, at 53,000 km, and the broader, fainter Galle Ring, at 42,000 km. A faint outward extension to the Le Verrier Ring has been named Lassell; it is bounded at its outer edge by the Arago Ring at 57,000 km. The first of these planetary rings was detected in 1968 by a team led by Edward Guinan. In the early 1980s, analysis of this data along with newer Neptune brightened significantly between 1980 and 2000. The apparent magnitude currently ranges from 7.67 to 7.89 with a mean of 7.78 and a standard deviation of 0.06. Prior to 1980 the planet was as faint as magnitude 8.0. Neptune is too faint to be visible to the naked eye and can be outshone by Jupiter's Galilean moons, the dwarf planet Ceres and the asteroids 4 Vesta, 2 Pallas, 7 Iris, 3 Juno, and 6 Hebe. A telescope or strong binoculars will resolve Neptune as a small blue disk, similar in appearance to Uranus. Because of the distance of Neptune from Earth, its angular diameter only ranges from 2.2 to 2.4 arcseconds, the smallest of the Solar System planets. Its small apparent size makes it challenging to study visually. Most telescopic data was fairly limited until the advent of the Hubble Space Telescope and large ground-based telescopes with adaptive optics (AO). The first scientifically useful observation of Neptune from ground-based telescopes using adaptive optics was commenced in 1997 from Hawaii. Neptune is currently entering its spring and summer season and has been shown to be heating up, with increased atmospheric activity and brightness "Voyager 2" is the only spacecraft that has visited Neptune. The spacecraft closest approach to the planet occurred on 25 August 1989. Because this was the last major planet the spacecraft could visit, it was decided to make a close flyby of the moon Triton, regardless of the consequences to the trajectory, similarly to what was done for "Voyager 1"s encounter with Saturn and its moon Titan. The images relayed back to Earth from "Voyager 2" became the basis of a 1989 PBS all-night program, "Neptune All Night". During the encounter, signals from the spacecraft required 246 minutes to reach Earth. Hence, for the most part, "Voyager 2" mission relied on preloaded commands for the Neptune encounter. The spacecraft performed a near-encounter with the moon Nereid before it came within 4,400 km of Neptune's atmosphere on 25 August, then passed close to the planet's largest moon Triton later the same day. The spacecraft verified the existence of a magnetic field surrounding the planet and discovered that the field was offset from the centre and tilted in a manner similar to the field around Uranus. Neptune's rotation period was determined using measurements of radio emissions and "Voyager 2" also showed that Neptune had a surprisingly active weather system. Six new moons were discovered, and the planet was shown to have more than one ring. The flyby also provided the first accurate measurement of Neptune's mass which was found to be 0.5 percent less than previously calculated. The new figure disproved the hypothesis that an undiscovered Planet X acted upon the orbits of Neptune and Uranus. After the "Voyager 2" flyby mission, the next step in scientific exploration of the Neptunian system, is considered to be a Flagship orbital mission. Such a hypothetical mission is envisioned to be possible in the late 2020s or early 2030s. However, there have been discussions to launch Neptune missions sooner. In 2003, there was a proposal in NASA's "Vision Missions Studies" for a "Neptune Orbiter with Probes" mission that does "Cassini"-level science. Another, more recent proposal was for "Argo", a flyby spacecraft to be launched in 2019, that would visit Jupiter, Saturn, Neptune, and a Kuiper belt object. The focus would be on Neptune and its largest moon Triton to be investigated around 2029. The proposed "New Horizons 2" mission (which was later scrapped) might also have done a close flyby of the Neptunian system. Currently a pending proposal for the Discovery program, the "Trident" would conduct a flyby of Neptune and Triton.
Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. Neptune is 17 times the mass of Earth, slightly more massive than its near-twin Uranus. Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of its atmosphere. Neptune orbits the Sun once every 164.8 years at an average distance of. It is named after the Roman god of the sea and has the astronomical symbol ♆, a stylised version of the god Neptune's trident.
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summarize: The idea of planets has evolved over its history, from the divine lights of antiquity to the earthly objects of the scientific age. The concept has expanded to include worlds not only in the Solar System, but in hundreds of other extrasolar systems. The ambiguities inherent in defining planets have led to much scientific controversy. The five classical planets of the Solar System, being visible to the naked eye, have been known since ancient times and have had a significant impact on mythology, religious cosmology, and ancient astronomy. In ancient times, astronomers noted how certain lights moved across the sky, as opposed to the "fixed stars", which maintained a constant relative position in the sky. Ancient Greeks called these lights (, "wandering stars") or simply (, "wanderers"), from which today's word "planet" was derived. In ancient Greece, China, Babylon, and indeed all pre-modern civilizations, it was almost universally believed that Earth was the center of the Universe and that all the "planets" circled Earth. The reasons for this perception were that stars and planets appeared to revolve around Earth each day and the apparently common-sense perceptions that Earth was solid and stable and that it was not moving but at rest. The first civilization known to have a functional theory of the planets were the Babylonians, who lived in Mesopotamia in the first and second millennia BC. The oldest surviving planetary astronomical text is the Babylonian Venus tablet of Ammisaduqa, a 7th-century BC copy of a list of observations of the motions of the planet Venus, that probably dates as early as the second millennium BC. The MUL.APIN is a pair The ancient Greeks initially did not attach as much significance to the planets as the Babylonians. The Pythagoreans, in the 6th and 5th centuries BC appear to have developed their own independent planetary theory, which consisted of the Earth, Sun, Moon, and planets revolving around a "Central Fire" at the center of the Universe. Pythagoras or Parmenides is said to have been the first to identify the evening star (Hesperos) and morning star (Phosphoros) as one and the same (Aphrodite, Greek corresponding to Latin Venus), though this had long been known by the Babylonians. In the 3rd century BC, Aristarchus of Samos proposed a heliocentric system, according to which Earth and the planets revolved around the Sun. The geocentric system remained dominant until the Scientific Revolution. In 499 CE, the Indian astronomer Aryabhata propounded a planetary model that explicitly incorporated Earth's rotation about its axis, which he explains as the cause of what appears to be an apparent westward motion of the stars. He also believed that the orbits of planets are elliptical. Aryabhata's followers were particularly strong in South India, where his principles of the diurnal In the 11th century, the transit of Venus was observed by Avicenna, who established that Venus was, at least sometimes, below the Sun. In the 12th century, Ibn Bajjah observed "two planets With the advent of the Scientific Revolution, use of the term "planet" changed from something that moved across the sky (in relation to the star field); to a body that orbited Earth (or that was believed to do so at the time); and by the 18th century to something that directly orbited the Sun when the heliocentric model of In the 19th century astronomers began to realize that recently discovered bodies that had been classified as planets for almost half a century (such as Ceres, Pallas, Juno, and Vesta) were very different from the traditional ones. These bodies shared the same region of space between Mars and Jupiter (the asteroid In the 20th century, Pluto was discovered. After initial observations led to the belief that it was larger than Earth, the object was immediately accepted as the ninth planet. Further monitoring found the body was actually much smaller: in 1936, Ray Lyttleton suggested that Pluto may be an escaped satellite of Neptune, and Fred Whipple suggested in 1964 that Pluto may be a comet. As it was still larger than all known asteroids and the population of dwarf planets & other trans-Neptunian objects was not well observed, it kept its status until 2006. In 1992, astronomers Aleksander Wolszczan and Dale Frail announced the discovery of With the discovery during the latter half of the 20th century of more objects within the Solar System and large objects around other stars, disputes arose over what should constitute a planet. There were particular disagreements over whether an object should be considered a planet if it was part of a distinct population such as a belt, or if it was large enough to generate energy by the thermonuclear fusion of deuterium. A growing number of astronomers argued for Pluto to be declassified as a planet, because many similar objects approaching its size had been found in There is no official definition of extrasolar planets. In 2003, the International Astronomical Union (IAU) Working Group on Extrasolar Planets issued a position statement, but this position statement was never proposed as an official IAU resolution and was never voted on by IAU members. The positions statement incorporates the following guidelines, mostly focused upon the boundary between planets and brown dwarfs: This working definition has since been widely used by astronomers when publishing discoveries of exoplanets in academic journals. Although temporary, The matter of the lower limit was addressed during the 2006 meeting of the IAU's General Assembly. After much debate and one failed proposal, a large majority of those remaining at the meeting voted to pass a resolution. The 2006 resolution defines planets within the Solar System as follows: Under this definition, the Solar System is considered to have eight planets. Bodies that fulfill the first two conditions but not the third (such as Ceres, Pluto, and Eris) are classified as dwarf planets, provided they are not also natural satellites of other planets. Originally an IAU committee had proposed a definition that would have included a much larger number of planets as it did not include (c) as a criterion. After much discussion, The table below lists Solar System bodies once considered to be planets. Beyond the scientific The names for the planets in the Western world are derived from the naming practices of the Romans, which ultimately derive from those of the Greeks and the Babylonians. In ancient Greece, the two great luminaries the Sun and the Moon were called "Helios" and "Selene"; the farthest planet (Saturn) was called "Phainon", the shiner; followed by "Phaethon" (Jupiter), "bright"; the red planet (Mars) was known as "Pyroeis", the "fiery"; the brightest (Venus) was known as "Phosphoros", the light bringer; and the fleeting final planet (Mercury) was called "Stilbon", the gleamer. The Greeks also made each planet sacred to one among their pantheon of gods, the Olympians: Helios and Selene were the names of both planets and gods; Phainon was sacred to Cronus, the Titan who fathered the Olympians; Phaethon was sacred to Zeus, Cronus's son who deposed him as king; Pyroeis was given to Ares, son of Zeus and god of war; Phosphoros was ruled by Aphrodite, the goddess of love; and Hermes, messenger of the gods and god of learning and wit, ruled over Stilbon. The Greek practice of grafting their gods' names onto the planets was almost certainly borrowed from the Babylonians. The Babylonians named Phosphoros after their goddess of love, "Ishtar"; Pyroeis after their god of war, "Nergal", Stilbon after their god of wisdom Nabu, and Phaethon after their chief god, "Marduk". There are too many concordances between Greek and Babylonian naming conventions for them to have arisen separately. The translation was not perfect. For instance, the Babylonian Nergal was a god of war, and thus the Greeks identified him with Ares. Unlike Ares, Nergal was also god of pestilence and the underworld. Today, most people in the western world know the planets by names derived from the Olympian pantheon of gods. Although modern Greeks still use their ancient names for the planets, other European languages, because of the influence of the Roman Empire and, later, the Catholic Church, use the Roman (Latin) names rather than the Greek ones. The Romans, who, like the Greeks, were Indo-Europeans, shared with them a common pantheon under different names but lacked the rich narrative traditions that Greek poetic culture had given their gods. During the later period of the Roman Republic, Roman writers borrowed much of the Greek narratives and applied them to their own pantheon, to the point where they became virtually indistinguishable. When the Romans studied Greek astronomy, they gave the planets their own gods' names: "Mercurius" (for Hermes), "Venus" (Aphrodite), "Mars" (Ares), "Iuppiter" (Zeus) and "Saturnus" (Cronus). When subsequent planets were discovered in the 18th and 19th centuries, It is not known with certainty how planets are formed. The prevailing theory is that they are formed during the collapse of a nebula into a thin disk of gas and dust. A protostar forms at the core, surrounded by a rotating protoplanetary disk. Through accretion (a process of sticky collision) dust particles in the disk steadily accumulate mass to form ever-larger bodies. Local concentrations of mass known as planetesimals form, and these accelerate the accretion process by drawing in additional material by their gravitational attraction. These concentrations become ever denser until they collapse inward under gravity to form protoplanets. After a planet reaches a mass somewhat larger than Mars' mass, it begins to accumulate an extended atmosphere, greatly increasing the capture rate of the planetesimals by means of atmospheric drag. Depending on the accretion history of solids and gas, a giant planet, an ice giant, or a terrestrial planet may result. When the protostar has grown such that it ignites to form a star, the surviving disk is removed from the inside outward There are eight planets in the Solar System, which are in increasing distance from the Sun: Jupiter is the An exoplanet (extrasolar planet) is a planet outside the Solar System. In early 1992, radio astronomers Aleksander Wolszczan and Dale Frail announced the discovery of two planets orbiting the pulsar PSR 1257+12. This discovery was confirmed, and is generally considered to be the first definitive detection of exoplanets. These pulsar planets are believed to have formed from the unusual remnants of the supernova that produced the pulsar, in a second round of planet formation, or else to be the remaining rocky cores of giant planets that survived the supernova and then decayed into their current orbits. The first confirmed discovery of an extrasolar planet orbiting an ordinary main-sequence star occurred on 6 October 1995, when Michel Mayor and Didier Queloz of the University of Geneva announced the detection of an exoplanet around 51 Pegasi. From then until the Kepler mission most known extrasolar planets were gas giants comparable in mass to Jupiter or larger as they were more easily detected. The catalog of Kepler candidate planets consists mostly of planets the size of Neptune and smaller, down to smaller than Mercury. There are types of planets that do not exist in the Solar System: super-Earths and mini-Neptunes, which could be rocky like Earth A planetary-mass object (PMO), planemo, or planetary body is a celestial object with a mass that falls within the range of the definition of a planet: massive enough to achieve hydrostatic equilibrium (to be rounded under its own gravity), but not enough to sustain core fusion like a star. By definition, all planets are "planetary-mass objects", but the purpose of this term is to refer to objects that do not conform to typical expectations for a planet. These include dwarf planets, which are rounded by their own gravity but not massive enough to clear their own orbit, the larger moons, and free-floating planemos, which may have been ejected from a system (rogue planets) or formed through cloud-collapse rather than accretion (sometimes called sub-brown dwarfs). A dwarf planet is a planetary-mass object that is neither a true planet nor a natural satellite; it is in direct orbit of a star, and is massive enough for its gravity to compress it into a hydrostatically equilibrious shape (usually a spheroid), but has not cleared the neighborhood of other material around its orbit. Alan Several computer simulations of stellar and planetary system formation have suggested that some objects of planetary mass would be ejected into Stars form via the gravitational collapse of gas clouds, but smaller objects can also form via cloud-collapse. Planetary-mass objects formed this way are sometimes called sub-brown dwarfs. Sub-brown dwarfs may be free-floating such as Cha 110913-773444 and OTS 44, or orbiting a larger In close binary star systems one of the stars can lose mass to a heavier companion. Accretion-powered pulsars may drive mass loss. Some large satellites (moons) are of similar size or larger than the planet Mercury, e.g. Jupiter's Galilean moons and Titan. Alan Stern Rogue planets in stellar clusters have similar velocities to the stars and so can be recaptured. They are typically captured into wide orbits between 100 and 10 AU. The capture efficiency decreases Although each planet has unique physical characteristics, a number of broad commonalities do exist among them. Some of these characteristics, such as rings or natural satellites, have only as yet been observed in planets in the Solar System, whereas others are also commonly observed in extrasolar planets. According to current definitions, all planets must revolve around stars; thus, any potential "rogue planets" are excluded. In the Solar System, all the planets orbit the Sun in the same direction as the Sun rotates (counter-clockwise as seen from above the Sun's north pole). At least one extrasolar planet, WASP-17b, has been found to orbit in the opposite direction to its star's rotation. The period of one revolution of a planet's orbit is known as its sidereal period or "year". A planet's year depends on its distance from its star; the farther a Planets also have varying degrees of axial tilt; they lie at an angle to the plane of their stars' equators. This causes the amount of light received by each hemisphere to vary over the course of its year; when the northern hemisphere points away from its star, the southern hemisphere points towards it, and vice versa. Each planet therefore has seasons, changes to the climate over the course of its year. The time at which each hemisphere points farthest or nearest from its star is known as its solstice. Each The planets rotate around invisible axes through their centres. A planet's rotation period is known as a stellar day. Most of the planets in the Solar System rotate in the same direction as they orbit the Sun, which is counter-clockwise as seen from above the Sun's north pole, the exceptions being Venus and Uranus, which rotate clockwise, though Uranus's extreme axial tilt means there are differing conventions on which of its poles is "north", and therefore whether it is rotating clockwise or anti-clockwise. Regardless of which convention is used, Uranus has a retrograde rotation relative to its orbit. The defining dynamic characteristic of a planet is that it has "cleared its neighborhood". A planet that has cleared its neighborhood has accumulated enough mass to gather up or sweep away all the planetesimals in its orbit. In effect, it orbits its star in isolation, as opposed to sharing its orbit with a multitude of similar-sized objects. This characteristic was mandated as part of the IAU's official definition of a planet in August, 2006. This criterion excludes such planetary bodies as Pluto, Eris and Ceres from full-fledged planethood, making them instead dwarf planets. Although to date this criterion only applies to the Solar System, a number of young extrasolar systems have been found in which evidence suggests orbital clearing is taking place within their circumstellar discs. A planet's defining physical characteristic is that it is massive enough for the force of its own gravity to dominate over the electromagnetic forces binding its physical structure, leading to a state of hydrostatic equilibrium. This effectively means that all planets are spherical or spheroidal. Up to a certain mass, an object can be irregular in shape, but beyond that point, which varies depending on the chemical makeup of the object, gravity begins to pull an object towards its own centre of mass until the object collapses into a sphere. Mass is also the prime attribute Every planet began its existence in an entirely fluid state; in early formation, the denser, heavier materials sank to the centre, leaving the lighter materials near the surface. Each therefore has a differentiated interior consisting of a dense planetary core surrounded by a mantle that either is or was a fluid. The terrestrial planets are sealed All of the Solar System planets except Mercury have substantial atmospheres because their gravity is strong enough to keep gases close to the surface. The larger giant planets are massive enough to keep large amounts of the light gases hydrogen and helium, whereas the smaller planets lose these gases into space. The composition of Earth's atmosphere is different from the other planets because the various life processes that have transpired on the planet have introduced free molecular oxygen. Planetary atmospheres are affected by the varying insolation or internal energy, leading to One important characteristic of the planets is their intrinsic magnetic moments, which in turn give rise to magnetospheres. The presence of a magnetic field indicates that the planet is still geologically alive. In other words, magnetized planets have flows of electrically conducting material in their interiors, which generate their magnetic fields. These fields significantly change the interaction of the planet and solar wind. A magnetized planet creates a cavity in the solar wind around itself called the magnetosphere, which the wind cannot penetrate. The magnetosphere can be much larger than the planet itself. In contrast, non-magnetized planets have only small magnetospheres induced by interaction of the ionosphere with the solar wind, which cannot effectively protect the planet. Of the eight planets Several planets or dwarf planets in the Solar System (such as Neptune and Pluto) have orbital periods that are in resonance with each other or with smaller bodies (this is also common in satellite systems). All except Mercury and Venus have natural satellites, often called "moons". Earth has one, Mars has two, and the giant planets have numerous moons in complex planetary-type systems. Many moons of the giant planets have features similar to those on the terrestrial planets and dwarf planets, and some have been studied as possible
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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summarize: In the 1840s, Urbain Le Verrier used Newtonian mechanics to predict the position of the then-undiscovered planet Neptune after analyzing perturbations in the orbit of Uranus. Subsequent observations of Neptune in the late 19th century led astronomers to speculate that Uranus's orbit was being disturbed by another planet besides Neptune. In 1906, Percival Lowell—a wealthy Bostonian who had founded Lowell Observatory in Flagstaff, Arizona, in 1894—started an extensive project in search of a possible ninth planet, which he termed "Planet X". By 1909, Lowell and William H. Pickering had suggested several possible celestial coordinates for such a planet. Lowell and his observatory conducted his search until his death in 1916, but to no avail. Unknown to Lowell, his surveys had captured two faint images of Pluto on March 19 and April 7, 1915, but they were not recognized for what they were. There are fourteen other The discovery made headlines around the globe. Lowell Observatory, which had the right to name the new object, received more than 1,000 suggestions from all over the world, ranging from Atlas to Zymal. Tombaugh urged Slipher to suggest a name for the new object quickly before someone else did. Constance Lowell proposed "Zeus", then "Percival" and finally "Constance". These suggestions were disregarded. The name Pluto, after the Roman god of the underworld, was proposed by Venetia Burney (1918–2009), an eleven-year-old schoolgirl in Oxford, England, who was interested in classical mythology. She suggested it in a conversation with her grandfather Falconer Madan, a former librarian at the University of Oxford's Bodleian Library, who passed the name to astronomy professor Herbert Hall Turner, who cabled it to colleagues in the United States. Each member of the Lowell Observatory was allowed to vote on a short-list of three potential names: Minerva (which was already the name for an asteroid), Cronus (which had lost reputation through being proposed by the unpopular astronomer Thomas Jefferson Jackson See), and Pluto. Pluto received every vote. Once Pluto was found, its faintness and lack of a resolvable disc cast doubt on the idea that it was Lowell's Planet X. Estimates of Pluto's mass were revised downward throughout the 20th century. Astronomers initially calculated its mass based on its presumed effect on Neptune and Uranus. In 1931, Pluto was calculated to be roughly the mass of Earth, with further calculations in 1948 bringing the mass down to roughly that of Mars. In 1976, Dale Cruikshank, Carl Pilcher and David Morrison of the University of Hawaii calculated Pluto's albedo for the first time, finding that it matched that for methane ice; this meant Pluto had to be exceptionally luminous for its size and therefore could not be From 1992 onward, many bodies were discovered orbiting in the same volume as Pluto, showing that Pluto is part of a population of objects called the Kuiper belt. This made its official status as a planet controversial, with many questioning whether Pluto should be considered together with or separately from its surrounding population. Museum and planetarium directors occasionally created controversy by omitting Pluto from planetary models of the Solar System. In February 2000 the Hayden Planetarium in New York City displayed a Solar System The debate came to a head in August 2006, with an IAU resolution that created an official definition for the term "planet". According to this resolution, there are three conditions for an object in the Solar System to be considered a planet: Pluto fails to meet the third condition. Its mass is substantially less than the combined mass of the other objects in its orbit: 0.07 times, in contrast to Earth, which is 1.7 million times the remaining mass in its orbit (excluding the moon). The IAU further decided that bodies that, like Pluto, meet criteria 1 and 2, but do not meet criterion 3 would be called dwarf planets. In September 2006, the IAU included Pluto, and Eris and its moon Dysnomia, in their Minor Planet Catalogue, giving them the official minor planet designations "(134340) Pluto", "(136199) Eris", and "(136199) Eris I Dysnomia". Had Pluto been included upon its discovery in 1930, it would have likely been designated 1164, following 1163 Saga, which was discovered a month earlier. There has been some resistance within the astronomical community toward the reclassification. Alan Stern, principal investigator with NASA's "New Horizons" mission to Pluto, derided the IAU resolution, stating that "the definition stinks, for technical reasons". Stern contended that, by the terms of the new definition, Earth, Mars, Jupiter, and Neptune, all of which share their orbits with asteroids, would be excluded. He argued that all big spherical moons, including the Moon, should likewise be considered Pluto's orbital period is currently about 248 years. Its orbital characteristics are substantially different from those of the planets, which follow nearly circular orbits around the Sun close to a flat reference plane called the ecliptic. In contrast, Pluto's orbit is moderately inclined relative to the ecliptic (over 17°) and moderately eccentric (elliptical). This eccentricity means a small region of Pluto's orbit lies closer to the Sun than Neptune's. The Pluto–Charon barycenter came to perihelion on September 5, 1989, and was last closer to the Sun than Neptune between February 7, 1979, and February 11, 1999. In the long term, Pluto's orbit is chaotic. Computer simulations can be used to predict its position for several million years (both forward and backward in time), but after intervals longer than the Lyapunov time of 10–20 million years, calculations become speculative: Pluto is sensitive to immeasurably small details of the Solar System, hard-to-predict factors that will gradually change Pluto's position in its orbit. The semi-major axis of Pluto's orbit varies between about 39.3 and 39.6 au with a period of about 19,951 years, corresponding to an orbital period varying between 246 and 249 years. The semi-major axis and period are presently getting longer. Despite Pluto's orbit appearing to cross that of Neptune when viewed from directly above, the two objects' orbits are aligned so that they can never collide or even approach closely. The two orbits do not intersect. When Pluto is closest to the Sun, and hence closest to Neptune's orbit as viewed from above, it is also the farthest above Neptune's path. Pluto's orbit passes about 8 AU above that of Neptune, preventing a collision. This alone is not enough to protect Pluto; perturbations from the planets (especially Neptune) could alter Pluto's orbit (such as its orbital precession) over millions of years so that a collision could be possible. However, Pluto is also protected by its 2:3 orbital resonance with Neptune: for every two orbits that Pluto makes around the Sun, Neptune makes three. Each cycle lasts about 495 years. This pattern is such that, in each 495-year cycle, the first time Pluto is near perihelion, Numerical studies have shown that over millions of years, the general nature of the alignment between the orbits of Pluto and Neptune does not change. There are several other resonances and interactions that enhance Pluto's stability. These arise principally from two additional mechanisms (besides the 2:3 mean-motion resonance). First, Pluto's argument of perihelion, the angle between the point where it crosses the ecliptic and the point where it is closest to the Sun, librates around 90°. This means that when Pluto is closest to the Sun, it is at its farthest above the plane of the Solar System, preventing encounters In 2012, it was hypothesized that 15810 Arawn could be a quasi-satellite of Pluto, a specific type of co-orbital configuration. According to the hypothesis, the object would be a quasi-satellite of Pluto for about 350,000 years out of every two-million-year period. Measurements made by Pluto's rotation period, its day, is equal to 6.387 Earth days. Like Uranus, Pluto rotates on its "side" in its orbital plane, with an axial tilt of 120°, and so its seasonal variation is extreme; at its solstices, one-fourth of its surface is in continuous daylight, whereas another fourth is in continuous darkness. The reason for this unusual orientation has been debated. Research from the University of Arizona has suggested that it may be due to the way that a body's spin will always The plains on Pluto's surface are composed of more than 98 percent nitrogen ice, with traces of methane and carbon monoxide. Nitrogen and carbon monoxide are most abundant on the anti-Charon face of Pluto (around 180° longitude, where Tombaugh Regio's western lobe, Sputnik Planitia, is located), whereas methane is most abundant near 300° east. The mountains are made of water ice. Pluto's surface is quite varied, with large differences in both brightness and color. Pluto is one of the most contrastive bodies in the Solar System, with as much contrast as Saturn's moon Iapetus. The color varies from charcoal black, to dark orange and white. Pluto's color is more similar to that of Io with slightly more orange and Pluto's density is. Because the decay of radioactive elements would eventually heat the ices enough for the rock to separate from them, scientists expect that Pluto's internal structure is differentiated, with the rocky material having settled into a dense core surrounded by a mantle of water ice. The pre–"New Horizons" estimate for the Pluto's diameter is and its mass is, 17.7% that of the Moon (0.22% that of Earth). Its surface area is, or roughly the same surface area as Russia. Its surface gravity is 0.063 "g" (compared to 1 "g" for Earth). The discovery of Pluto's satellite Charon in 1978 enabled a determination of the mass of the Pluto–Charon system by application of Newton's formulation of Kepler's third law. Observations of Pluto in occultation with Charon allowed scientists to establish Pluto's diameter more accurately, whereas the invention of adaptive optics allowed them to determine its shape more accurately. With less than 0.2 lunar masses, Pluto is much less massive than the terrestrial planets, and also less massive than seven moons: Ganymede, Pluto has a tenuous atmosphere consisting of nitrogen (N), methane (CH), and carbon monoxide (CO), which are in equilibrium with their ices on Pluto's surface. According to the measurements by "New Horizons", the surface pressure is about 1 Pa (10 μbar), roughly one million to 100,000 times less than Earth's atmospheric pressure. It was initially thought that, as Pluto moves away from the Sun, its atmosphere should gradually freeze onto the surface; studies of "New Horizons" data and ground-based occultations show that Pluto's atmospheric density increases, and that it likely remains gaseous throughout Pluto's orbit. "New Horizons" observations showed that atmospheric escape of nitrogen to be 10,000 times less than expected. Alan Stern has contended that Pluto has five known natural satellites. The closest to Pluto is Charon. First identified in 1978 by astronomer James Christy, Charon is the only moon of Pluto that may be in hydrostatic equilibrium; Charon's mass is sufficient to cause the barycenter of the Pluto–Charon system to be outside Pluto. Beyond Charon there are four much smaller circumbinary moons. In order of distance from Pluto they are Styx, Nix, Kerberos, and Hydra. Nix and Hydra were both discovered in 2005, Kerberos was discovered in 2011, and Styx was discovered in 2012. The satellites' orbits are circular (eccentricity < 0.006) and coplanar with Pluto's equator (inclination < 1°), and therefore tilted approximately 120° relative to Pluto's orbit. The Plutonian system is highly compact: the five known satellites orbit within the inner 3% of the region where prograde orbits would be stable. The orbital periods of all Pluto's moons are linked in a system of orbital resonances and near resonances. When precession is accounted Pluto's origin and identity had long puzzled astronomers. One early hypothesis was that Pluto was an escaped moon of Neptune, knocked out of orbit by its largest current moon, Triton. This idea was eventually rejected after dynamical studies showed it to be impossible because Pluto never approaches Neptune in its orbit. Pluto's true place in the Solar System began to reveal itself only in 1992, when astronomers began to find small icy objects beyond Neptune that were similar to Pluto not only in orbit but also in size and composition. This trans-Neptunian population is thought to be the source of many short-period comets. Pluto is now known to be the largest member of the Kuiper belt, a stable belt of objects located between 30 and 50 AU from the Sun. As of 2011, surveys of the Kuiper belt to magnitude 21 were nearly complete and any remaining Pluto-sized objects are expected to be beyond 100 AU from the Sun. Like other Kuiper-belt objects (KBOs), Pluto shares features with comets; for example, the solar wind is gradually blowing Pluto's surface into space. It has been claimed that if Pluto were placed as near to the Sun as Earth, it would develop a tail, as comets do. This claim has been disputed with the argument that Pluto's escape velocity is too high for this to happen. It has been proposed that Pluto may have formed as a result of the agglomeration of numerous comets and Kuiper-belt Pluto's distance from Earth makes its in-depth study and exploration difficult. On July 14, 2015, NASA's "New Horizons" space probe flew through the Pluto system, providing much information about it. Pluto's visual apparent magnitude averages 15.1, brightening to 13.65 at perihelion. To see it, a telescope is required; around 30 cm (12 in) aperture being desirable. It looks star-like and without a visible disk even in large telescopes, because its angular diameter is only 0.11". The earliest maps of Pluto, made in the late 1980s, were brightness maps created from close observations of eclipses by its largest moon, Charon. Observations were made of the change in the total average brightness of the Pluto–Charon system during the eclipses. For The "New Horizons" spacecraft, which flew by Pluto in July 2015, is the first and so far only attempt to explore Pluto directly. Launched in 2006, it captured its first (distant) images of Pluto in late September 2006 during a test of the Long Range Reconnaissance Imager. The images, taken from a distance of approximately 4.2 billion kilometers, confirmed the spacecraft's ability to track distant targets, critical for maneuvering toward Pluto and other Kuiper belt objects. In early 2007 the craft made use of a gravity assist from Jupiter. "New Horizons" made its closest approach to Pluto on July 14, 2015, after a 3,462-day journey across the Solar System. Scientific observations of Pluto began five months before the closest approach and continued for at least a month after the encounter. Observations were conducted using a remote sensing package that included imaging instruments and a radio science investigation tool, as well as spectroscopic and other experiments. The scientific goals The equatorial region of the sub-Charon hemisphere of Pluto has only "New Horizons" imaged all of Pluto's northern hemisphere, and the equatorial regions down to about 30° South. Higher southern latitudes have only been observed, at very low resolution, from Earth. Images from the
Pluto (minor planet designation: 134340 Pluto) is an icy dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It was the first and the largest Kuiper belt object to be discovered.
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summarize: Andula is a working-class young woman living in a fading Czech factory town, where, due to an oversight in central state planning, women outnumber men 16–1. The film opens with an intimate scene between Andula and her fellow shoe-factory-worker friend as they lie in bed in their dormitory discussing the ring given to Andula by her boyfriend Tonda and gossiping about her mildly flirtatious encounter with a forest ranger, which is shown in flashback. The factory supervisor belatedly realizes that the gender disparity is impairing morale and productivity, so he arranges for an army officer to organize military maneuvers near the town in order for the factory to sponsor a big dance, at which the workers can find male companionship among the soldiery. "They need what we needed when we were young", he explains to a sympathetic officer. Anticipation runs high on both sides, with the girls expecting to meet the young men of their dreams, while the recruits, many of whom are actually middle-aged reservists, out-of-shape and already married, look forward to a night of revelry and seduction. The night of the party is a disappointment for some members of both groups; Andula and her friends are repulsed by the unappealing soldiers, whom they call "old buffers", and a trio of reservists are so nonplussed by the situation that they commit a series of comic faux pas, like sending a bottle of wine to the wrong table and dropping a wedding ring that one of them is trying to hide, only to watch it roll across the floor and land at the feet of the young women who are the objects of their lust. For these people, the mixer is a huge flop, with the girls retiring to the lavatory to devise a way to escape their pursuers and the aging reservists arguing with each other over expenses (one points out that "you can only get it [sex] free at home") and speculating on the necessity of going to the woods in order to consummate their romantic plans ("Imagine, in this weather!"). For others, however, the dance is a success: the factory supervisor looks on in smug satisfaction as couples throng the crowded dance floor, one girl holds her hands together in a gesture showing her delight and gratitude when she is asked to dance, while an obese, balding soldier capers with a mismatched tall, thin brunette, both clearly having the time of their lives. Andula strikes up a flirtation with Milda, the big-city pianist of the band providing the music. He reads her palm and instructs her in how to rebuff unwanted advances with a kick in the shins. After the party she goes to bed with Milda, although the comic frustrations continue, with Milda fighting a battle with a window shade that won't close, before he feels secure in making love. Afterward, as they lie in bed together, Andula asks what Milda meant when he said she was "angular". He replies that a woman is shaped like a guitar: "And you, you look like a guitar too", he tells her, "but one painted by Picasso." Before they part, he offhandedly invites her to come to Prague and pay him a visit sometime. Although she hears nothing from Milda after their night together, she still expects to reunite with her dream man shortly, so she breaks off with Tonda, who storms the dormitory demanding his ring back. After listening to a speech by the housemother on the virtues of fidelity and commitment, she packs up her suitcase and arrives on Milda's doorstep in the big city, ready to resume their romance. Milda is not home, and she meets his parents, who have never heard of her and don't know what they should do with her. Milda comes home very late, and after an evening of comically painful tension and uncertainty, his parents decide it's only decent to put the girl up for the night on the sofa, requiring Milda to climb into bed with them in order to avoid any appearance of impropriety. Forman has described this famous scene: "It’s a tight fit. The old man wants to sleep; the son would like to get thrown out so he can join the girl on the couch, but the mother runs the show and won’t tolerate any such filthy ideas under her roof." Andula, kneeling outside the door of their bedroom, overhears the family squabbling, and when it becomes clear to her that she is not valued in the least, she breaks down in tears and, the next morning, returns to her home. She tells her friends about her "wonderful" trip to the capital and how nice Milda's parents were to her, especially his father, and then she returns to work at the factory. Miloš Forman's first feature film "Černý Petr" ("Black Peter") was released in 1964 and was not viewed favorably by Czech governmental authorities until it was selected for competition at that year's Locarno Film Festival, where it won the top prize, thereby gaining the approval of Czechoslovakia's communist bureaucracy and making it possible for Forman to pursue further projects with relative freedom. Unsure of what the next project should be, Forman recalled an experience he'd had driving around Prague late one evening when he'd encountered a young woman struggling to cross a bridge while carrying a heavy suitcase. He gave her a lift and learned her story: she had come to the big city from Varnsdorf, where she had been seduced by a young engineer, who had given her a phony address in Žižkov and promised to take her away from her dreary life. After confirming that she had been duped, Forman interviewed the girl for much of the rest of the night, before putting her on a train back to her home town. Commentators have noted that Forman was particularly sensitized to such situations because when he was 10, his mother had been taken away by the Gestapo, never to be seen again, which led to years of Forman traveling around searching for security with nothing but a suitcase. In Forman's words: "I guess I'll always be moved by the sight of a young person with a suitcase seeking a connection in a strange city." Forman recounted this memory to fellow film enthusiasts and colleagues Ivan Passer and Jaroslav Papoušek and asked them if it might be the basis for a good film. "Maybe", replied Passer, "but it still needs one more thing – a billiards table." The trio had a passion for billiards and felt that they could make a success of even the weakest idea if they had ready access to a table. Having found a good one at Dobříš Castle, the three, along with Václav Šašek, wrote a screenplay that fleshed out Forman's encounter with the young woman from Varnsdorf. When the finished script was submitted to the Šebor-Bor production team, it was approved at first, only to have the chief of the script department pronounce it the dullest thing he'd read in years and urge Forman not to proceed with the project, since it would spoil the good reputation the director had established with "Black Peter". In Forman's words: "It wasn't arty enough, but, on the other hand, it didn't have enough commercial appeal either. It would offend and irritate the public, he told me, because it made fun of the common man, who would be disgusted by it." Despite this objection, Vlastimil Harnach, the head of the studio, approved proceeding with the film in part because, due to the political and cultural thaw in Czechoslovakia at the time, decision makers were anxious to avoid the appearance of overt administrative interference in the creative process. Forman and his colleagues were committed to the strategy of casting non-professionals and utilizing dialogue improvisation whenever possible. Most of the actors were chosen from among relatives, friends and acquaintances of Forman and his crew, to the point where Forman was later to liken the atmosphere to making a "home movie". For the title role, Forman selected his 18-year-old ex-sister-in-law, Hana Brejchová, because he had known her a long time, trusted her, and had great respect for her natural talents: "She had an amazing ability of free expression, but with the risk that she didn’t recognize the extent. However, Vláďa Pucholt [who played Milda] held her firmly in the rhythm of the scene, in a professional position." The character of Milda's father was played by the uncle of Miroslav Ondříček's wife, and Milda's mother was played by a factory lathe operator whom Passer and Papoušek had met on a streetcar, and who struck them as someone who "seemed so interested in things around her, no matter how silly". The factory supervisor was played by the actual public relations manager of the factory at Zruč nad Sázavou, where location shooting took place. For the main trio of reservists, Forman wanted to use non-professionals, including the writer Josef Škvorecký, but found that, while the three men did well improvising together whenever they appeared in pairs, they lost their rhythm when all three were included in the same shot. So Forman went to Škvorecký and told the writer that he looked too intelligent to play his role and replaced him with the professional actor Vladimír Menšík. In Škvorecký's words: "To tell someone that he is too intelligent to be an actor is a very nice way of letting him know that he should stay with screen-play writing. Milos is a very considerate person. The fact that he so gently threw me out made possible the greatest scene of "Loves of a Blonde"". Forman was later to justify his decision to add a professional: "While nonactors keep the actors honest and real, the actors give the scene the rhythm and shape that the nonactors don't feel. A nonactor inhabits the situation so completely that he or she isn't able to view it from the outside, to perceive it as a rhythmic whole with its punctuation and its larger dramatic purpose. Nonactors are perfectly content to repeat themselves and ramble on, so an actor can pull them through the dramatic arch of the scene and draw out the emotional contours of the situation." Ironically, the least self-confident performer in the film was one of the few professional actors: Vladimír Pucholt, who played the pianist. According to Forman: "This great actor, who had tremendous artistic intuition, completely mistrusted his talent. I think this was because he had a very rationalist disposition and could never see, much less measure, the result of his acting. 'Was it good, Mr. Forman? 'he asked me after every perfect shot. 'It was excellent!' 'Really?' 'Really.' He never believed me and all of us loved him." Since he was working with a largely non-professional cast, Forman's operating procedure was never to share the script with any of the performers, because if he had given them the screenplay, "they’ll take it home to read, and their wives will end up directing your movie". Instead, he chose to explain each scene in great detail just before starting to shoot takes, reciting the dialog from memory only one time, so that when the camera was rolling the actors had to try to remember as much as they could of what he had told them and then improvise to the best of their ability what they had forgotten or only half-understood. His cameraman was later to say that, as a result, all the performers were playing Miloš Forman playing their roles. The cinematographer for "Loves of a Blonde" was Miroslav Ondříček, like Forman a graduate of the FAMU. Ondříček and Forman had met at Czechoslovakia's Barrandov Studios in the early 1960s when Ondříček was just learning to shoot feature films and Forman was struggling to create his own early projects. Ondříček was in full accord with Forman's reliance on non-professional actors, adopting a cinéma-vérité style compatible with orthodox socialist realism. Ondříček was schooled in documentary filmmaking and, as a result, he insisted on performing all photographic tasks, like focus, lighting and composing, personally, while refusing access to the set by all film editors, saying: "The editor can only edit what I am filming. He can't use a master shot if he doesn't have it. He can't make a close-up if he doesn't have it. This is our [his and Forman's] job." Critics have often admired Ondříček's success in sustaining low-contrast lighting throughout the film, rendering "a sweetly mysterious softness, as if a principle of compassion existed in the world alongside its cruelty". The big dance was the film's most sustained and elaborate sequence, so two cameras were used, with frequent recourse to hand-holding and telephoto zooming in order both to sustain the documentary-style look and feel and to take pressure off the performers, who were not always sure whether they were being included in the shots. During filming, the set was visited by British director Lindsay Anderson, whose film "This Sporting Life" was greatly admired by Forman. Anderson was so impressed by Ondříček's work, that he brought the cameraman to England to film "The White Bus" and "if...", announcing that he had found a person with a new sensibility, “a new pair of eyes”. Ironically, the storyline of the film was replayed in real life. One of the nonprofessional actresses, a blonde factory worker, had a torrid affair with a technician who was part of the film crew. Although the man neglected to tell her that he was married with a child, he promised to send for her when he got back to Prague and set her up in an apartment in the capital city. After waiting for a long time to hear from him, and telling all her friends that she would shortly be summoned to her love nest, she packed up her belongings and traveled to Prague, only to be spurned in no uncertain terms. The consequence of this situation was grimmer than the denouement of the film; the girl was embarrassed to return home, became a prostitute, went to jail, attempted suicide and finally emigrated to Australia, where there was a shortage of women, especially among Czech emigrants. Once principal photography was finished, Forman found himself with miles of raw material, so he and his editor, Miroslav Hájek, spent many long hours organizing the footage into a series of situations, like the "big dance" situation and the "meeting the parents" situation. In turn, each of these situations are constructed out of sequences of gags in which the characters improvise, in the words of commentator Constantin Parvulescu, "like various instruments of a band": "Many of these situations can be broken down into gags. There are several such gags reminiscent of early comedy in "Loves of a Blonde": the soldiers-getting-off-the-train gag; the wine-bottle gag; the wedding-ring gag; the palm-reading gag; the roll-up-blinds gag; and the three-guys-in-two-beds gag." Interspersed with these gags are extended character improvisations, such as Milda's discussion of Picasso, his mother's rants at the dining table, and the factory supervisor's appeal for the army's support. Once the film had been released in Czechoslovakia, Forman sought an international distributor, who informed him that the film was too short for American audiences and that it didn't have enough nudity in it; so Forman was coerced into shooting some additional scenes that were never shown for domestic consumption. One of these scenes, which was included in the US version, involved a slapstick sequence in which Milda, the pianist, tries to pick up a buxom girl on the streets of Prague, only to have her trick him into entering the wrong bedroom of the four-story building in which she lives, disturbing the sleeping residents. Film scholar Peter Hames has summarized three themes of "Loves of a Blonde" that have been discussed repeatedly in critical writings on the film, themes that have been something of a constant throughout Forman's career: "the impermanence of young love, the confusion and despair of middle age, and the gulf between the generations". Another theme that is often identified involves the awkwardness and confusion surrounding sex in a repressed society. Most critics have also commented on the confluence of comedy and sadness in the film's depiction of everyday life in a totalitarian state, although while some consider "Loves of a Blonde" Forman's most pointed critique of Czech society under communism, others point out that the grim conditions are not solely due to misguided public policy, but that individuals create their own isolation as well. When "Loves of a Blonde" was first released, there was a sense of betrayal on the part of the Zruč nad Sázavou shoe factory that had hosted the filmmakers on location and considerable consternation among authorities at the Ministry of Light Industry, with both organizations feeling that the comically unlovely depiction of social conditions in Czech factory towns would make it even harder to recruit workers than it already was. To everyone's surprise, though, the movie functioned as a "great big classified ad", in that hundreds of Czech boys traveled to Zruč nad Sázavou and camped out in the woods in hopes of hooking up with the female factory workers, who responded appropriately by sneaking out of their dorms at night for assignations with the campers. "Loves of a Blonde" sold out in theaters throughout Czechoslovakia. The film was the recipient of the Order of Klement Gottwald, an award that recognized exemplary works "for building of socialist homeland". Forman was later to say: "The award from the first communist president of the land and a legendary boozer was more of an embarrassment than anything else. The only good thing about it was the fat envelope that came with the ribbon. It contained 20 000 CZK, nearly a year's salary". "Loves of a Blonde" was submitted to a number of the major film festivals of the day: it was the opening film of the 1966 New York Film Festival, was an invited entry in that year's London Film Festival and was nominated for the highest prize at the Venice Film Festival. Shortly after it was completed, it was purchased by a Czech distribution company called Filmexport, only to be re-sold as part of a multi-picture package to a firm called CBK, which proceeded to air it on television through a number of 24-hour movie channels. The film was nominated for the Golden Globe for Best Foreign Film and the Academy Award for Best Foreign Language Film in 1967. It was ranked No. 89 in "Empire" magazine's "The 100 Best Films Of World Cinema" in 2010. Critical reaction within Czechoslovakia tended to focus on the film's perceived negativity with regard to social and political conditions in the country, and, for that reason, it was not distributed at all within the Soviet Union. On the whole, international critics of the time praised "Loves of a Blonde", with positive reviews published by "Saturday Review", "The New Yorker", "America", "Sight and Sound", "Harper's", and "The New York Times". One of the film's most influential champions was Jean Collet, writing in "Cahiers du cinéma" that, by capturing the momentary indiscretions of his characters on the screen, Forman forces the audience into a voyeuristic situation that induces embarrassment and laughter. There were dissenting voices, however: Phillip J. Hartung, writing in "Commonweal", compared the film unfavorably with Ivan Passer's contemporaneous "Intimate Lighting", while Robert Hatch, in "The Nation", felt that "Loves of a Blonde" was an "endearing but artless" film, with its long central section of the big dance having little to do with the main plot. In a lengthy article in "Film Comment", Kirk Bond compared the "ordinariness" of "Loves of a Blonde" unfavorably with other Czech films of the period that he believed displayed greater mastery of narrative technique. More recent retrospective reviews of the film have been equally mixed, with some critics, like Dennis Schwartz, writing that, "its simple but meaningful story has captured the emotions of its subject in a timeless and real fashion", while others, like David Nusair, find fault: "Presumably, the film's supposed to be a quirky and revealing slice of life – but since the central character is never developed beyond the superficial, it's impossible to care about her". It holds a 93% rating on the review aggregator website Rotten Tomatoes from 15 reviewers who, on average, scored it 8.1 on a scale of 10. "Loves of a Blonde" has often been identified as one of the most significant and ambitious productions of the Czech New Wave, a movement in which a group of young filmmakers, many of whom were educated by the national film academy in Prague, including Forman, Ján Kadár, Věra Chytilová and Jiří Menzel, among others, took significant political risks by using cinema to protest the hypocrisy and absurdity of the Communist state. This movement has been attributed to a period of cultural and political reform, starting in 1962, during which filmmakers were given state support but were also allowed a certain amount of relative artistic freedom, enabling them to create movies with the stated objective of making "the Czech people collectively aware that they were participants in a system of oppression and incompetence which had brutalized them all." In particular, Forman, Ivan Passer and Jaroslav Papoušek have collectively become known as the "Forman school" of filmmaking, which combines an interest in documentary realism, including consistent focus on the quotidian, with a surrealistic tendency to "uncover the hidden side of reality, its comical or monstrous quality which lies just beneath everyday mishaps, stutters and waverings". Diane Sippl has noted that, once Forman came to America and created his high-profile Hollywood productions, such as "One Flew Over the Cuckoo's Nest", "Hair" and "Amadeus", he was able to introduce into commercial cinema the same qualities that characterized his early films like "Loves of a Blonde": "An acute observation of the ironic details of mundane life; an intimate understanding of emotions, both projected and silenced; a keen sensitivity to the moment when solemnity melts into farce," English director Ken Loach has stated that the mixture of professional and non-professional actors in "Loves of a Blonde" had a significant influence on him and other international filmmakers, by creating an atmosphere in which non-professionals who live in the milieu depicted by the film bring an expertise and authenticity which serves as "a touchstone for everyone else in the film", while professionals bring knowledge of film craft, which can be helpful to their inexperienced colleagues. Although some performers who, at the time, were not professional later became so, one of the professional actors, Vladimír Pucholt, who played a major role, Milda the pianist, soon gave up acting, relocated to Canada and became a pediatrician. In April 2019, a restored version of the film was selected to be shown in the Cannes Classics section at the 2019 Cannes Film Festival. "Loves of a Blonde" was released in VHS video format in 1987 by RCA/Columbia Pictures and re-released in that format in 2000 by Janus Films, Home Vision Cinema. In 2002, it was released as a DVD by Criterion Collection, in a new digital transfer, with restored image and sound, a video interview with director Milos Forman, a deleted scene and new & improved English subtitle translation. Since 2010, a version has been available as part of Criterion's "Essential art house" series.
Loves of a Blonde (), also known as A Blonde in Love, is a 1965 Czechoslovak ensemble comedy film directed by Miloš Forman that follows a young woman, Andula, who has a routine job in a shoe factory in provincial Czechoslovakia, and her attempts at forging a romantic relationship.
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764, 509, 20697, 678, 10, 21334, 538, 351, 9, 141532, 289, 37702, 4, 41775, 19, 25, 7, 172852, 50491, 509, 8306, 47, 12008, 70, 26499, 678, 2499, 111, 70, 51339, 1314, 4, 6637, 2174, 764, 1902, 34475, 2856, 70, 49119, 20706, 4, 44, 2347, 53, 26, 1181, 5646, 442, 5368, 47, 12301, 4, 136, 2363, 148, 60877, 1221, 3564, 1257, 8951, 214, 935, 14277, 740, 175399, 4, 764, 19667, 47, 73342, 12638, 28302, 23, 6782, 22443, 1660, 8108, 72134, 47, 106443, 51776, 4, 24862, 1916, 70, 26519, 1295, 98323, 4734, 1632, 1733, 4, 221, 450, 3229, 70, 15593, 509, 21972, 214, 70, 39329, 7, 1902, 47, 9790, 47, 37629, 237, 5045, 237, 1836, 5809, 111, 2367, 764, 1902, 30745, 2856, 136, 7068, 60418, 41079, 47, 70, 2965, 111, 2363, 81273, 2367, 1836, 1902, 240764, 707, 4734, 23552, 9, 24658, 271, 26995, 5, 18763, 15593, 669, 509, 14432, 47, 5154, 450, 4, 237, 10, 16750, 4, 756, 70, 51339, 1314, 3542, 75169, 167660, 41775, 19, 75169, 2363, 31486, 7, 5, 581, 27076, 188, 41382, 56, 100, 44, 104711, 7, 111, 10, 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22027, 25, 18, 765, 442, 5, 1529, 831, 25, 18, 3249, 10, 20903, 9, 2037, 2174, 764, 22027, 25, 18, 765, 442, 5, 3293, 83, 2446, 378, 31047, 136, 41775, 19, 25, 7, 268, 12447, 1242, 180423, 7, 765, 27983, 73275, 297, 47824, 6195, 9215, 25, 7, 36272, 23, 205027, 214, 27226, 9, 57361, 271, 6, 177476, 87420, 70, 1346, 4, 89159, 214, 44, 11, 53673, 538, 759, 824, 93905, 32977, 7432, 4, 237, 2174, 10, 24702, 133, 111, 375, 126365, 13835, 71, 23, 70, 8999, 33233, 8752, 6863, 156217, 939, 740, 581, 6957, 82393, 509, 70, 1346, 25, 7, 2684, 205027, 297, 136, 121151, 13, 40, 944, 3956, 4, 221, 6626, 15593, 7, 3542, 11814, 4, 678, 103351, 188118, 13, 47, 3535, 9, 16200, 214, 136, 5501, 57595, 111245, 214, 23, 12989, 15044, 47, 205027, 70, 128745, 53, 9, 40946, 6713, 136, 12319, 136, 47, 5646, 81147, 5773, 70, 51339, 1314, 4, 2750, 3542, 959, 11343, 9077, 36766, 1836, 3542, 8035, 99201, 23, 70, 51876, 7, 5, 133698, 1346, 214, 4, 70, 5423, 509, 36997, 71, 390, 56101, 14364, 17859, 20347, 85522, 4, 124901, 1346, 44, 73243, 4706, 214, 16505, 58, 509, 6782, 538, 73275, 297, 390, 41775, 19, 5, 85522, 509, 221, 204971, 390, 47824, 6195, 9215, 25, 7, 4488, 4, 450, 764, 91048, 70, 15593, 669, 47, 30715, 47, 1346, 44, 3957, 22392, 25852, 58, 136, 44, 3190, 7673, 4, 8668, 34, 60636, 450, 764, 1902, 14037, 10, 3445, 678, 10, 3525, 26000, 2481, 4, 52, 11, 3525, 80836, 111, 46223, 792, 70599, 71407, 4, 70, 13765, 2256, 111, 70, 1346, 509, 456, 20706, 297, 23, 2773, 6897, 5, 6561, 111, 70, 351, 141532, 289, 215542, 90, 4, 10, 96948, 31461, 53, 4488, 56, 4, 1902, 10, 130352, 532, 103086, 678, 10, 6, 55875, 3378, 2750, 509, 2831, 111, 70, 1346, 172040, 5, 106073, 70, 332, 124789, 89829, 47, 14192, 604, 450, 764, 509, 139505, 678, 10, 29041, 4, 764, 103036, 71, 47, 25379, 100, 604, 3229, 764, 4163, 4420, 47, 210721, 136, 5423, 604, 1257, 23, 142, 127451, 23, 70, 10323, 26349, 5, 24372, 89289, 100, 10, 4989, 1733, 47, 36802, 1295, 4049, 4, 136, 128219, 756, 604, 23902, 450, 2412, 2806, 16610, 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80997, 12, 44, 2347, 56646, 669, 6620, 111, 27150, 5161, 4, 70, 169463, 136, 224, 109637, 111, 86991, 32070, 4, 136, 70, 195083, 17721, 70, 58093, 7, 740, 116267, 73986, 450, 83, 27983, 207487, 83687, 7, 70, 10, 434, 92, 19364, 7432, 136, 169463, 206990, 1100, 23, 10, 86254, 5281, 100510, 5, 17006, 35778, 7, 765, 2843, 6868, 297, 98, 70, 158, 18026, 6620, 111, 180327, 136, 17110, 7432, 23, 70, 1346, 25, 7, 8, 1434, 10763, 111, 190704, 6897, 23, 10, 166750, 3378, 11341, 4, 102971, 12960, 3060, 16916, 44, 104711, 7, 111, 10, 89868, 13, 58, 41775, 19, 25, 7, 2684, 6275, 297, 127472, 111, 103655, 100510, 1379, 60013, 8780, 4, 27060, 6275, 1810, 450, 70, 118432, 27289, 621, 959, 31247, 538, 4743, 47, 1239, 64527, 71, 3835, 44930, 4, 1284, 450, 79165, 28282, 2363, 10002, 6, 219488, 237, 5299, 5, 14847, 44, 104711, 7, 111, 10, 89868, 13, 58, 509, 5117, 121447, 4, 2685, 509, 10, 10422, 111, 139647, 16300, 98, 70, 2831, 111, 70, 567, 42, 28828, 1932, 51004, 596, 24375, 15756, 13, 31461, 53, 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summarize: Around 150 AD, Ptolemy recorded, in books VII–VIII of his "Almagest", five stars that appeared nebulous. He also noted a region of nebulosity between the constellations Ursa Major and Leo that was not associated with any star. The first true nebula, as distinct from a star cluster, was mentioned by the Persian astronomer Abd al-Rahman al-Sufi, in his "Book of Fixed Stars" (964). He noted "a little cloud" where the Andromeda Galaxy is located. He also cataloged the Omicron Velorum star cluster as a "nebulous star" and other nebulous objects, such as Brocchi's Cluster. The supernova that created the Crab Nebula, the SN 1054, was observed by Arabic and Chinese astronomers in 1054. In 1610, Nicolas-Claude Fabri de Peiresc discovered the Orion Nebula using a telescope. This nebula was also observed by Johann Baptist Cysat in 1618. However, the first detailed study of the Orion Nebula was not performed until 1659, by Christiaan Huygens, who also believed he was the first person to discover this nebulosity. In 1715, Edmond Halley published a list of six nebulae. This number steadily increased during the century, with Jean-Philippe de Cheseaux compiling a list of 20 (including eight not previously known) in 1746. From 1751 to 1753, Nicolas-Louis de Lacaille cataloged 42 nebulae from the Cape of Good Hope, most of which were previously unknown. Charles Messier then compiled a catalog of 103 "nebulae" (now called Messier objects, which included what are now known to be galaxies) by 1781; his interest was detecting comets, and these were objects that might be mistaken for them. The number of nebulae was then greatly increased by the efforts of William Herschel and his sister Caroline Herschel. Their "Catalogue of One Thousand New Nebulae and Clusters of Stars" was published in 1786. A second catalog of a thousand was published in 1789 and the third and final catalog of 510 appeared in 1802. During much of their work, William Herschel believed that these nebulae were merely unresolved clusters of stars. In 1790, however, he discovered a star surrounded by nebulosity and concluded that this was a true nebulosity, rather than a more distant cluster. Beginning in 1864, William Huggins examined the spectra of about 70 nebulae. He found that roughly a third of them had the emission spectrum of a gas. The rest showed a continuous spectrum and thus were thought to consist of a mass of stars. A third category was added in 1912 when Vesto Slipher showed that the spectrum of the nebula that surrounded the star Merope matched the spectra of the Pleiades open cluster. Thus the nebula radiates by reflected star light. About 1923, following the Great Debate, it had become clear that many "nebulae" were in fact galaxies far from our own. Slipher and Edwin Hubble continued to collect the spectra from many different nebulae, finding 29 that showed emission spectra and 33 that had the continuous spectra of star light. In 1932, Hubble announced that nearly all nebula are associated with stars, and their illumination comes from star light. He also discovered that the emission spectrum nebulae are nearly always associated with stars having spectral classifications of B or hotter (including all O-type main sequence stars), while nebulae with continuous spectra appear with cooler stars. Both Hubble and Henry Norris Russell concluded that the nebulae surrounding the hotter stars are transformed in some manner. There are a variety of formation mechanisms for the different types of nebulae. Some nebulae form from gas that is already in the interstellar medium while others are produced by stars. Examples of the former case are giant molecular clouds, the coldest, densest phase of interstellar gas, which can form by the cooling and condensation of more diffuse gas. Examples of the latter case are planetary nebulae formed from material shed by a star in late stages of its stellar evolution. Star-forming regions are a class of emission nebula associated with giant molecular clouds. These form as a molecular cloud collapses under its own weight, producing stars. Massive stars may form in the center, and their ultraviolet radiation ionizes the surrounding gas, making it visible at optical wavelengths. The region of ionized hydrogen surrounding the massive stars is known as an H II region while the shells of neutral hydrogen surrounding the H II region are known as photodissociation region. Examples of star-forming regions are the Orion Nebula, the Rosette Nebula and the Omega Nebula. Feedback from star-formation, in the form of supernova explosions of massive stars, stellar winds or ultraviolet radiation from massive stars, or outflows from low-mass stars may disrupt the cloud, destroying the nebula after several million years. Other nebulae form as the result of supernova explosions; the death throes of massive, short-lived stars. The materials thrown off from the supernova explosion are then ionized by the energy and the compact object that its core produces. One of the best examples of this is the Crab Nebula, in Taurus. The supernova event was recorded in the year 1054 and is labeled SN 1054. The compact object that was created after the explosion lies in the center of the Crab Nebula and its core is now a neutron star. Still other nebulae form as planetary nebulae. This is the final stage of a low-mass star's life, like Earth's Sun. Stars with a mass up to 8–10 solar masses evolve into red giants and slowly lose their outer layers during pulsations in their atmospheres. When a star has lost enough material, its temperature increases and the ultraviolet radiation it emits can ionize the surrounding nebula that it has thrown off. Our Sun will produce a planetary nebula and its core will remain behind in the form of a white dwarf. Objects named nebulae belong to 4 major groups. Before their nature was understood, galaxies ("spiral nebulae") and star clusters too distant to be resolved as stars were also classified as nebulae, but no longer are. Not all cloud-like structures are named nebulae; Herbig–Haro objects are an example. Most nebulae can be described as diffuse nebulae, which means that they are extended and contain no well-defined boundaries. Diffuse nebulae can be divided into emission nebulae, reflection nebulae and dark nebulae. Visible light nebulae may be divided into emission nebulae, which emit spectral line radiation from excited or ionized gas (mostly ionized hydrogen); they are often called H II regions, H II referring to ionized hydrogen), and reflection nebulae which are visible primarily due to the light they reflect. Reflection nebulae themselves do not emit significant amounts of visible light, but are near stars and reflect light from them. Similar nebulae not illuminated by stars do not exhibit visible radiation, but may be detected as opaque clouds blocking light from luminous objects behind them; they are called dark nebulae. Although these nebulae have different visibility at optical wavelengths, they are all bright sources of infrared emission, chiefly from dust within the nebulae. Planetary nebulae are the remnants of the final stages of stellar evolution for lower-mass stars. Evolved asymptotic giant branch stars expel their outer layers outwards due to strong stellar winds, thus forming gaseous shells, while leaving behind the star's core in the form of a white dwarf. Radiation from the hot white dwarf excites the expelled gases, producing emission nebulae with spectra similar to those of emission nebulae found in star formation regions. They are H II regions, because mostly hydrogen is ionized, but planetary are denser and more compact than nebulae found in star formation regions. Planetary nebulae were given their name by the first astronomical observers who were initially unable to distinguish them from planets, and who tended to confuse them with planets, which were of more interest to them. Our Sun is expected to spawn a planetary nebula about 12 billion years after its formation. A protoplanetary nebula (PPN) is an astronomical object at the short-lived episode during a star's rapid stellar evolution between the late asymptotic giant branch (LAGB) phase and the following planetary nebula (PN) phase. During the AGB phase, the star undergoes mass loss, emitting a circumstellar shell of hydrogen gas. When this phase comes to an end, the star enters the PPN phase. The PPN is energized by the central star, causing it to emit strong infrared radiation and become a reflection nebula. Collimated stellar winds from the central star shape and shock the shell into an axially symmetric form, while producing a fast moving molecular wind. The exact point when a PPN becomes a planetary nebula (PN) is defined by the temperature of the central star. The PPN phase continues until the central star reaches a temperature of 30,000 K, after which it is hot enough to ionize the surrounding gas. A supernova occurs when a high-mass star reaches the end of its life. When nuclear fusion in the core of the star stops, the star collapses. The gas falling inward either rebounds or gets so strongly heated that it expands outwards from the core, thus causing the star to explode. The expanding shell of gas forms a supernova remnant, a special diffuse nebula. Although much of the optical and X-ray emission from supernova remnants originates from ionized gas, a great amount of the radio emission is a form of non-thermal emission called synchrotron emission. This emission originates from high-velocity electrons oscillating within magnetic fields.
A nebula (Latin for 'cloud' or 'fog'; pl. nebulae, nebulæ or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, the term was used to describe any diffused astronomical object, including galaxies beyond the Milky Way. The Andromeda Galaxy, for instance, was once referred to as the "Andromeda Nebula" (and spiral galaxies in general as "spiral nebulae") before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble and others.
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summarize: The term "quasar" was first used in a paper by Taiwanese-born U.S. astrophysicist Hong-Yee Chiu in May 1964, in "Physics Today", to describe certain astronomically-puzzling objects: Between 1917 and 1922, it became clear from work by Heber Curtis, Ernst Öpik and others, that some objects ("nebulae") seen by astronomers were in fact distant galaxies like our own. But when radio astronomy commenced in the 1950s, astronomers detected, among the galaxies, a small number of anomalous objects with properties that defied explanation. The objects emitted large amounts of radiation of many frequencies, but no source could be located optically, or in some cases only a faint and point-like object somewhat like a distant star. The spectral lines of these objects, which identify the chemical elements of which the object is composed, were also extremely strange and defied explanation. Some of them changed their luminosity very rapidly in the optical range and even more rapidly in the X-ray range, suggesting an upper limit on their size, perhaps no larger than our own Solar System. This implies an extremely high power density. Considerable discussion took place over what these objects might be. They were described as ""quasi-stellar" [meaning: star-like] "radio sources"", or ""quasi-stellar objects"" (QSOs), a name which reflected their unknown nature, and this became shortened to "quasar". The first quasars (3C 48 and 3C 273) were discovered in the late 1950s, as radio sources in all-sky radio surveys. They were first noted as radio sources with no corresponding visible object. Using small telescopes and the Lovell Telescope as an interferometer, they were shown to have a very small angular size. By 1960, hundreds of these objects had been recorded and published in the Third Cambridge Catalogue while astronomers scanned the skies for their optical counterparts. In 1963, a definite identification of the radio source 3C 48 with an optical object was published by Allan Sandage and Thomas A. Matthews. Astronomers had detected what appeared to be a faint blue star at the location of the radio source and obtained its spectrum, which contained many unknown broad emission lines. The anomalous spectrum defied interpretation. British-Australian astronomer John Bolton made many early observations of quasars, including a breakthrough in 1962. Another radio source, 3C 273, was predicted to undergo five occultations by the Moon. Measurements taken by Cyril Hazard and John Bolton during one of the occultations using the Parkes Radio Telescope allowed Maarten Schmidt to find a visible counterpart to the radio source and obtain an optical spectrum using the Hale Telescope on Mount Palomar. This spectrum revealed the same strange emission lines. Schmidt was able to demonstrate that these were likely to be the ordinary spectral lines of hydrogen redshifted by 15.8%, at the time, a high redshift (with only a handful of much fainter galaxies known with higher redshift). If this was due to the physical motion of the "star", then 3C 273 was receding at an enormous velocity, around, far beyond the speed of any known star and defying any obvious explanation. Nor would an extreme velocity help to explain 3C 273's huge radio emissions. If the redshift was cosmological (now known to be correct), the large distance implied that 3C 273 was far more luminous than any galaxy, but much more compact. Also, 3C 273 was bright enough to detect on archival photographs dating back to the 1900s; it was found to be variable on yearly timescales, implying that a substantial fraction of the light was emitted from a region less than 1 light-year in size, tiny compared to a galaxy. Although it raised many questions, Schmidt's discovery quickly revolutionized quasar observation. The strange spectrum of 3C 48 was quickly identified by Schmidt, Greenstein and Oke as hydrogen and magnesium redshifted by 37%. Shortly afterwards, two more quasar spectra in 1964 and five more in 1965 were also confirmed as ordinary light that had been redshifted to an extreme degree. While the observations and redshifts themselves were not doubted, their correct interpretation was heavily debated, and Bolton's suggestion that the radiation detected from quasars were ordinary spectral lines from distant highly redshifted sources with extreme velocity was not widely accepted at the time. An extreme redshift could imply great distance and velocity but could also be due to extreme mass or perhaps some other unknown laws of nature. Extreme velocity and distance would also imply immense power output, which lacked explanation. The small sizes were confirmed by interferometry and by observing the speed with which the quasar as a whole varied in output, and by their inability to be seen in even the most powerful visible-light telescopes as anything more than faint starlike points of light. But if they were small and far away in space, their power output would have to be immense and difficult to explain. Equally, if they were very small and much closer to our galaxy, it would be easy to explain their apparent power output, but less easy to explain their redshifts and lack of detectable movement against the background of the universe. Schmidt noted that redshift is also associated with the expansion of the universe, as codified in Hubble's law. If the measured redshift was due to expansion, then this would support an interpretation of very distant objects with extraordinarily high luminosity and power output, far beyond any object seen to date. This extreme luminosity would also explain the large radio signal. Schmidt concluded that 3C 273 could either be an individual star around 10 km wide within (or near to) our galaxy, or a distant active galactic nucleus. He stated that a distant and extremely powerful object seemed more likely to be correct. Schmidt's explanation for the high redshift was not widely accepted at the time. A major concern was the enormous amount of energy these objects would have to be radiating, if they were distant. In the 1960s no commonly accepted mechanism could account for this. The currently accepted explanation, that it is due to matter in an accretion disc falling into a supermassive black hole, was only suggested in 1964 by Edwin Salpeter and Yakov Zel'dovich, and even then it was rejected by many astronomers, because in the 1960s, the existence of black holes was still widely seen as theoretical and too exotic, and because it was not yet confirmed that many galaxies (including our own) have supermassive black holes at their center. The strange spectral lines in their radiation, and the speed of change seen in some quasars, also suggested to many astronomers and cosmologists that the objects were comparatively small and therefore perhaps bright, massive and not far away; accordingly that their redshifts were not due to distance or velocity, and must be due to some other reason or an unknown process, meaning that the quasars were not really powerful objects nor at extreme distances, as their redshifted light implied. A common alternative explanation was that the redshifts were caused by extreme mass (gravitational redshifting explained by general relativity) and not by extreme velocity (explained by special relativity). Various explanations were proposed during the 1960s and 1970s, each with their own problems. It was suggested that quasars were nearby objects, and that their redshift was not due to the expansion of space (special relativity) but rather to light escaping a deep gravitational well (general relativity). This would require a massive object, which would also explain the high luminosities. However, a star of sufficient mass to produce the measured redshift would be unstable and in excess of the Hayashi limit. Quasars also show forbidden spectral emission lines, previously only seen in hot gaseous nebulae of low density, which would be too diffuse to both generate the observed power and fit within a deep gravitational well. There were also serious concerns regarding the idea of cosmologically distant quasars. One strong argument against them was that they implied energies that were far in excess of known energy conversion processes, including nuclear fusion. There were some suggestions that quasars were made of some hitherto unknown form of stable antimatter regions and that this might account for their brightness. Others speculated that quasars were a white hole end of a wormhole, or a chain reaction of numerous supernovae. Eventually, starting from about the 1970s, many lines of evidence (including the first X-ray space observatories, knowledge of black holes and modern models of cosmology) gradually demonstrated that the quasar redshifts are genuine and due to the expansion of space, that quasars are in fact as powerful and as distant as Schmidt and some other astronomers had suggested, and that their energy source is matter from an accretion disc falling onto a supermassive black hole. This included crucial evidence from optical and X-ray viewing of quasar host galaxies, finding of "intervening" absorption lines, which explained various spectral anomalies, observations from gravitational lensing, Peterson and Gunn's 1971 finding that galaxies containing quasars showed the same redshift as the quasars, and Kristian's 1973 finding that the "fuzzy" surrounding of many quasars was consistent with a less luminous host galaxy. This model also fits well with other observations suggesting that many or even most galaxies have a massive central black hole. It would also explain why quasars are more common in the early universe: as a quasar draws matter from its accretion disc, there comes a point when there is less matter nearby, and energy production falls off or ceases, as the quasar becomes a more ordinary type of galaxy. The accretion-disc energy-production mechanism was finally modeled in the 1970s, and black holes were also directly detected (including evidence showing that supermassive black holes could be found at the centers of our own and many other galaxies), which resolved the concern that quasars were too luminous to be a result of very distant objects or that a suitable mechanism could not be confirmed to exist in nature. By 1987 it was "well accepted" that this was the correct explanation for quasars, and the cosmological distance and energy output of quasars was accepted by almost all researchers. Later it was found that not all quasars have strong radio emission; in fact only about 10% are "radio-loud". Hence the name "QSO" (quasi-stellar object) is used (in addition to "quasar") to refer to these objects, further categorised into the "radio-loud" and the "radio-quiet" classes. The discovery of the quasar had large implications for the field of astronomy in the 1960s, including drawing physics and astronomy closer together. In 1979 the gravitational lens effect predicted by Albert Einstein's general theory of relativity was confirmed observationally for the first time with images of the double quasar 0957+561. It is now known that quasars are distant but extremely luminous objects, so any light that reaches the Earth is redshifted due to the metric expansion of space. Quasars inhabit the centers of active galaxies and are among the most luminous, powerful, and energetic objects known in the universe, emitting up to a thousand times the energy output of the Milky Way, which contains 200–400 billion stars. This radiation is emitted across the electromagnetic spectrum, almost uniformly, from X-rays to the far infrared with a peak in the ultraviolet optical bands, with some quasars also being strong sources of radio emission and of gamma-rays. With high-resolution imaging from ground-based telescopes and the Hubble Space Telescope, the "host galaxies" surrounding the quasars have been detected in some cases. These galaxies are normally too dim to be seen against the glare of the quasar, except with special techniques. Most quasars, with the exception of 3C 273, whose average apparent magnitude is 12.9, cannot be seen with small telescopes. Quasars are believed—and in many cases confirmed—to be powered by accretion of material into supermassive black holes in the nuclei of distant galaxies, as suggested in 1964 by Edwin Salpeter and Yakov Zel'dovich. Light and other radiation cannot escape from within the event horizon of a black hole. The energy produced by a quasar is generated "outside" the black hole, by gravitational stresses and immense friction within the material nearest to the black hole, as it orbits and falls inward. The huge luminosity of quasars results from the accretion discs of central supermassive black holes, which can convert between 6% and 32% of the mass of an object into energy, compared to just 0.7% for the p–p chain nuclear fusion process that dominates the energy production in Sun-like stars. Central masses of 10 to 10 solar masses have been measured in quasars by using reverberation mapping. Several dozen nearby large galaxies, including our own Milky Way galaxy, that do not have an active center and do not show any activity similar to a quasar, are confirmed to contain a similar supermassive black hole in their nuclei (galactic center). Thus it is now thought that all large galaxies have a black hole of this kind, but only a small fraction have sufficient matter in the right kind of orbit at their center to become active and power radiation in such a way as to be seen as quasars. This also explains why quasars were more common in the early universe, as this energy production ends when the supermassive black hole consumes all of the gas and dust near it. This means that it is possible that most galaxies, including the Milky Way, have gone through an active stage, appearing as a quasar or some other class of active galaxy that depended on the black-hole mass and the accretion rate, and are now quiescent because they lack a supply of matter to feed into their central black holes to generate radiation. The matter accreting onto the black hole is unlikely to fall directly in, but will have some angular momentum around the black hole, which will cause the matter to collect into an accretion disc. Quasars may also be ignited or re-ignited when normal galaxies merge and the black hole is infused with a fresh source of matter. In fact, it has been suggested that a quasar could form when the Andromeda Galaxy collides with our own Milky Way galaxy in approximately 3–5 billion years. In the 1980s, unified models were developed in which quasars were classified as a particular kind of active galaxy, and a consensus emerged that in many cases it is simply the viewing angle that distinguishes them from other active galaxies, such as blazars and radio galaxies. The highest-redshift quasar known () is ULAS J1342+0928, with a redshift of 7.54, which corresponds to a comoving distance of approximately 29.36 billion light-years from Earth (these distances are much larger than the distance light could travel in the universe's 13.8 billion year history because space itself has also been expanding). More than quasars have been found, most from the Sloan Digital Sky Survey. All observed quasar spectra have redshifts between 0.056 and 7.54 (as of 2017). Applying Hubble's law to these redshifts, it can be shown that they are between 600 million and 29.36 billion light-years away (in terms of comoving distance). Because of the great distances to the farthest quasars and the finite velocity of light, they and their surrounding space appear as they existed in the very early universe. The power of quasars originates from supermassive black holes that are believed to exist at the core of most galaxies. The Doppler shifts of stars near the cores of galaxies indicate that they are rotating around tremendous masses with very steep gravity gradients, suggesting black holes. Although quasars appear faint when viewed from Earth, they are visible from extreme distances, being the most luminous objects in the known universe. The brightest quasar in the sky is 3C 273 in the constellation of Virgo. It has an average apparent magnitude of 12.8 (bright enough to be seen through a medium-size amateur telescope), but it has an absolute magnitude of −26.7. From a distance of about 33 light-years, this object would shine in the sky about as brightly as our Sun. This quasar's luminosity is, therefore, about 4 trillion (4) times that of the Sun, or about 100 times that of the total light of giant galaxies like the Milky Way. This assumes that the quasar is radiating energy in all directions, but the active galactic nucleus is believed to be radiating preferentially in the direction of its jet. In a universe containing hundreds of billions of galaxies, most of which had active nuclei billions of years ago but only seen today, it is statistically certain that thousands of energy jets should be pointed toward the Earth, some more directly than others. In many cases it is likely that the brighter the quasar, the more directly its jet is aimed at the Earth. Such quasars are called blazars. The hyperluminous quasar APM 08279+5255 was, when discovered in 1998, given an absolute magnitude of −32.2. High-resolution imaging with the Hubble Space Telescope and the 10 m Keck Telescope revealed that this system is gravitationally lensed. A study of the gravitational lensing of this system suggests that the light emitted has been magnified by a factor of ~10. It is still substantially more luminous than nearby quasars such as 3C 273. Quasars were much more common in the early universe than they are today. This discovery by Maarten Schmidt in 1967 was early strong evidence against Steady-state cosmology and in favor of the Big Bang cosmology. Quasars show the locations where massive black holes are growing rapidly (by accretion). These black holes grow in step with the mass of stars in their host galaxy in a way not understood at present. One idea is that jets, radiation and winds created by the quasars, shut down the formation of new stars in the host galaxy, a process called "feedback". The jets that produce strong radio emission in some quasars at the centers of clusters of galaxies are known to have enough power to prevent the hot gas in those clusters from cooling and falling onto the central galaxy. Quasars' luminosities are variable, with time scales that range from months to hours. This means that quasars generate and emit their energy from a very small region, since each part of the quasar would have to be in contact with other parts on such a time scale as to allow the coordination of the luminosity variations. This would mean that a quasar varying on a time scale of a few weeks cannot be larger than a few light-weeks across. The emission of large amounts of power from a small region requires a power source far more efficient than the nuclear fusion that powers stars. The conversion of gravitational potential energy to radiation by infalling to a black hole converts between 6% and 32% of the mass to energy, compared to 0.7% for the conversion of mass to energy in a star like our Sun. It is the only process known that can produce such high power over a very long term. (Stellar explosions such as supernovas and gamma-ray bursts, and direct matter–antimatter annihilation, can also produce very high power output, but supernovae only last for days, and the universe does not appear to have had large amounts of antimatter at the relevant times). Since quasars exhibit all the properties common to other active galaxies such as Seyfert galaxies, the emission from quasars can be readily compared to those of smaller active galaxies powered by smaller supermassive black holes. To create a luminosity of 10 watts (the typical brightness of a quasar), a super-massive black hole would have to consume the material equivalent of 10 stars per year. The brightest known quasars devour 1000 solar masses of material every year. The largest known is estimated to consume matter equivalent to 10 Earths per second. Quasar luminosities can vary considerably over time, depending on their surroundings. Since it is difficult to fuel quasars for many billions of years, after a quasar finishes accreting the surrounding gas and dust, it becomes an ordinary galaxy. Radiation from quasars is partially "nonthermal" (i.e., not due to black-body radiation), and approximately 10% are observed to also have jets and lobes like those of radio galaxies that also carry significant (but poorly understood) amounts of energy in the form of particles moving at relativistic speeds. Extremely high energies might be explained by several mechanisms (see Fermi acceleration and Centrifugal mechanism of acceleration). Quasars can be detected over the entire observable electromagnetic spectrum, including radio, infrared, visible light, ultraviolet, X-ray and even gamma rays. Most quasars are brightest in their rest-frame ultraviolet wavelength of 121.6 nm Lyman-alpha emission line of hydrogen, but due to the tremendous redshifts of these sources, that peak luminosity has been observed as far to the red as 900.0 nm, in the near infrared. A minority of quasars show strong radio emission, which is generated by jets of matter moving close to the speed of light. When viewed downward, these appear as blazars and often have regions that seem to move away from the center faster than the speed of light (superluminal expansion). This is an optical illusion due to the properties of special relativity. Quasar redshifts are measured from the strong spectral lines that dominate their visible and ultraviolet emission spectra. These lines are brighter than the continuous spectrum. They exhibit Doppler broadening corresponding to mean speed of several percent of the speed of light. Fast motions strongly indicate a large mass. Emission lines of hydrogen (mainly of the Lyman series and Balmer series), helium, carbon, magnesium, iron and oxygen are the brightest lines. The atoms emitting these lines range from neutral to highly ionized, leaving it highly charged. This wide range of ionization shows that the gas is highly irradiated by the quasar, not merely hot, and not by stars, which cannot produce such a wide range of ionization. Like all (unobscured) active galaxies, quasars can be strong X-ray sources. Radio-loud quasars can also produce X-rays and gamma rays by inverse Compton scattering of lower-energy photons by the radio-emitting electrons in the jet. "Iron quasars" show strong emission lines resulting from low-ionization iron (Fe ), such as IRAS 18508-7815. Quasars also provide some clues as to the end of the Big Bang's reionization. The oldest known quasars ("z" = 6) display a Gunn–Peterson trough and have absorption regions in front of them indicating that the intergalactic medium at that time was neutral gas. More recent quasars show no absorption region, but rather their spectra contain a spiky area known as the Lyman-alpha forest; this indicates that the intergalactic medium has undergone reionization into plasma, and that neutral gas exists only in small clouds. The intense production of ionizing ultraviolet radiation is also significant, as it would provide a mechanism for reionization to occur as galaxies form. Despite this, current theories suggest that quasars were not the primary source of reionization; the primary causes of reionization were probably the earliest generations of stars, known as Population III stars (possibly 70%), and dwarf galaxies (very early small high-energy galaxies) (possibly 30%). Quasars show evidence of elements heavier than helium, indicating that galaxies underwent a massive phase of star formation, creating population III stars between the time of the Big Bang and the first observed quasars. Light from these stars may have been observed in 2005 using NASA's Spitzer Space Telescope, although this observation remains to be confirmed. The taxonomy of quasars includes various subtypes representing subsets of the quasar population having distinct properties. Because quasars are extremely distant, bright, and small in apparent size, they are useful reference points in establishing a measurement grid on the sky. The International Celestial Reference System (ICRS) is based on hundreds of extra-galactic radio sources, mostly quasars, distributed around the entire sky. Because they are so distant, they are apparently stationary to our current technology, yet their positions can be measured with the utmost accuracy by very-long-baseline interferometry (VLBI). The positions of most are known to 0.001 arcsecond or better, which is orders of magnitude more precise than the best optical measurements. A grouping of two or more quasars on the sky can result from a chance alignment, where the quasars are not physically associated, from actual physical proximity, or from the effects of gravity bending the light of a single quasar into two or more images by gravitational lensing. When two quasars appear to be very close to each other as seen from Earth (separated by a few arcseconds or less), they are commonly referred to as a "double quasar". When the two are also close together in space (i.e. observed to have similar redshifts), they are termed a "quasar pair", or as a "binary quasar" if they are close enough that their host galaxies are likely to be physically interacting. As quasars are overall rare objects in the universe, the probability of three or more separate quasars being found near the same physical location is very low, and determining whether the system is closely separated physically requires significant observational effort. The first true triple quasar was found in 2007 by observations at the W. M. Keck Observatory Mauna Kea, Hawaii. LBQS 1429-008 (or QQQ J1432-0106) was first observed in 1989 and at the time was found to be a double quasar. When astronomers discovered the third member, they confirmed that the sources were separate and not the result of gravitational lensing. This triple quasar has a redshift of "z" = 2.076. The components are separated by an estimated 30–50 kpc, which is typical for interacting galaxies. In 2013, the second true triplet of quasars, QQQ J1519+0627, was found with a redshift "z" = 1.51, the whole system fitting within a physical separation of 25 kpc. The first true quadruple quasar system was discovered in 2015 at a redshift "z" = 2.0412 and has an overall physical scale of about 200 kpc. A multiple-image quasar is a quasar whose light undergoes gravitational lensing, resulting in double, triple or quadruple images of the same quasar. The first such gravitational lens to be discovered was the double-imaged quasar Q0957+561 (or Twin Quasar) in 1979. An example of a triply lensed quasar is PG1115+08. Several quadruple-image quasars are known, including the Einstein Cross and the Cloverleaf Quasar, with the first such discoveries happening in the mid-1980s.
A quasar () (also known as a quasi-stellar object abbreviated QSO) is an extremely luminous active galactic nucleus (AGN), in which a supermassive black hole with mass ranging from millions to billions of times the mass of the Sun is surrounded by a gaseous accretion disk. As gas in the disk falls towards the black hole, energy is released in the form of electromagnetic radiation, which can be observed across the electromagnetic spectrum. The power radiated by quasars is enormous: the most powerful quasars have luminosities thousands of times greater than a galaxy such as the Milky Way.
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summarize: Any main-sequence star with an initial mass of above 8 times the mass of the sun () has the potential to produce a neutron star. As the star evolves away from the main sequence, subsequent nuclear burning produces an iron-rich core. When all nuclear fuel in the core has been exhausted, the core must be supported by degeneracy pressure alone. Further deposits of mass from shell burning cause the core to exceed the Chandrasekhar limit. Electron-degeneracy pressure is overcome and the core collapses further, sending temperatures soaring to over. At these temperatures, photodisintegration (the breaking up of iron nuclei into alpha particles by high-energy gamma rays) occurs. As the temperature climbs even higher, electrons and protons combine to form neutrons via electron capture, releasing a flood of neutrinos. When densities reach nuclear density of, a combination of strong force repulsion and neutron degeneracy pressure halts the contraction. The infalling outer envelope of the star A neutron star has a mass of at least 1.1 solar masses (). The upper limit of mass for a neutron star is called the Tolman–Oppenheimer–Volkoff limit and is generally held to be around, but a recent estimate puts the upper limit at. The maximum observed mass of neutron stars is about for PSR J0740+6620 discovered in September, 2019. Compact stars below the Chandrasekhar limit of are generally white dwarfs whereas compact stars with a mass between and are expected to be neutron stars, but there is an interval of a few tenths of a solar mass where the masses of low-mass neutron stars and high-mass white dwarfs can overlap. It is thought that beyond the stellar remnant will overcome the strong force repulsion and neutron Neutron stars have overall densities of to ( to times the density of the Sun), which is comparable to the approximate density of an atomic nucleus of. The neutron star's density varies from about in the crust—increasing with depth—to about or (denser than an atomic nucleus) deeper inside. A neutron star is so dense that one teaspoon (5 milliliters) of its material would have a mass over, about 900 times the mass of the Great Pyramid of Giza. In the enormous gravitational field of a neutron star, that teaspoon of material would weigh, which is 15 times what the Moon would weigh if it were placed on the surface of the Earth. The entire mass of the Earth The magnetic field strength on the surface of neutron stars ranges from c. 10 to 10 tesla. These are orders of magnitude higher than in any other object: for comparison, a continuous 16 T field has been achieved in the laboratory and is sufficient to levitate a living frog due to diamagnetic levitation. Variations in magnetic field strengths are most likely the main factor that allows different types of neutron stars to be distinguished by their spectra, and explains the periodicity of pulsars. The neutron stars known as magnetars have the strongest magnetic fields, in the range of 10 to 10 tesla, and have become the widely accepted hypothesis for neutron star types soft gamma repeaters (SGRs) and anomalous X-ray pulsars (AXPs). The magnetic energy density of a 10 T field is extreme, exceeding the mass−energy density of ordinary matter. Fields of this strength are able to polarize the vacuum to the The gravitational field at a neutron star's surface is about times stronger than on Earth, at around. Such a strong gravitational field acts as a gravitational lens and bends the radiation emitted by the neutron star such that parts of the normally invisible rear surface become visible. If the radius of the neutron star is 3"GM"/"c" or less, then the photons may be trapped in an orbit, thus making the whole surface of that neutron star visible "from a single vantage Current understanding of the structure of neutron stars is defined by existing mathematical models, but it might be possible to infer some details through studies of neutron-star oscillations. Asteroseismology, a study applied to ordinary stars, can reveal the inner structure of neutron stars by analyzing observed spectra of stellar oscillations. Current models indicate that matter at the surface of a neutron star is composed of ordinary atomic nuclei crushed into a solid lattice with a sea of electrons flowing through the gaps between them. It is possible that the nuclei at the surface are iron, due to iron's high binding energy per nucleon. It is also possible that heavy elements, such as iron, simply sink beneath the surface, leaving only light nuclei like helium and hydrogen. If the surface temperature exceeds 10 kelvin (as in the case of a young pulsar), the surface should be fluid instead of the solid phase that might exist in Neutron stars are detected from their electromagnetic radiation. Neutron stars are usually observed to pulse radio waves and other electromagnetic radiation, and neutron stars observed with pulses are called pulsars. Pulsars' radiation is thought to be caused by particle acceleration near their magnetic poles, which need not be aligned with the rotational axis of the neutron star. It is thought that a large electrostatic field builds up near the magnetic poles, leading to electron emission. These electrons are magnetically accelerated along the field lines, leading to curvature radiation, with the radiation being strongly polarized towards the plane In addition to pulsars, non-pulsating neutron stars have also been identified, although they may have minor periodic variation in luminosity. In addition to radio emissions, neutron stars have also been identified in other parts of the electromagnetic spectrum. This includes visible light, near infrared, ultraviolet, X-rays, and gamma rays. Pulsars observed in X-rays are known as X-ray Neutron stars rotate extremely rapidly after their formation due to the conservation of angular momentum; in analogy to spinning ice skaters pulling in their arms, the slow rotation of the original star's core speeds up as it shrinks. A newborn neutron star can rotate many times a second. Over time, neutron stars slow, as their rotating magnetic fields in effect radiate energy associated with the rotation; older neutron stars may take several seconds for each revolution. This is called "spin down". The rate at which a neutron star slows its rotation is usually constant and very small. The periodic time ("P") is the rotational period, the time for one rotation of a neutron star. The spin-down rate, the rate of slowing of rotation, is then given the symbol formula_8 ("P"-dot), the derivative of "P" with respect to time. It is defined as periodic time increase per unit time; it is a dimensionless quantity, but can be given the units of s⋅s (seconds per second). The spin-down rate ("P"-dot) of neutron stars usually falls within the range of 10 to 10 s⋅s, with the shorter period (or faster rotating) observable neutron stars usually having smaller "P"-dot. As a neutron star ages, its rotation slows (as "P" increases); eventually, the rate Neutron star rotational speeds can increase, a process known as spin up. Sometimes neutron stars absorb orbiting matter from companion stars, increasing the rotation rate and reshaping the neutron star into an oblate spheroid. This causes an increase in the rate of rotation of the neutron star of over a hundred times per Sometimes a neutron star will undergo a glitch, a sudden small increase of its rotational speed or spin up. Glitches are thought to be the effect of a starquake—as the rotation of the neutron star slows, its shape becomes more spherical. Due to the stiffness of the "neutron" crust, this happens as discrete events when the crust ruptures, creating a starquake similar to earthquakes. After the starquake, the An "anti-glitch", a sudden small decrease in rotational speed, or spin down, of a neutron star has also been reported. It occurred in the magnetar 1E 2259+586, that in one case At present, there are about 2,000 known neutron stars in the Milky Way and the Magellanic Clouds, the majority of which have been detected as radio pulsars. Neutron stars are mostly concentrated along the disk of the Milky Way, although the spread perpendicular to the disk is large because the supernova explosion process can impart high translational speeds (400 km/s) to the newly formed neutron star. Some of the closest known neutron stars are RX J1856.5−3754, which is about About 5% of all known neutron stars are members of a binary system. The formation and evolution of binary neutron stars can be a complex process. Neutron stars have been observed in binaries with ordinary main-sequence stars, red giants, white dwarfs, or other neutron stars. According to modern theories of binary evolution, it is expected that neutron stars also exist in binary systems with black hole companions. The merger of binaries containing two neutron stars, or a neutron star and a black hole, has been observed through the emission of gravitational waves. Binary systems containing neutron stars often emit X-rays, which are emitted by hot gas as it falls towards the surface of the neutron star. The source of the gas is the companion star, The distance between two neutron stars in a close binary system is observed to shrink as gravitational waves are emitted. Ultimately, the neutron stars will come into contact and coalesce. The coalescence of binary neutron stars is one of the leading models for the origin of short gamma-ray bursts. Strong evidence for this model came from the Neutron stars can host exoplanets. These can be original, circumbinary, captured, or the result of a second round of planet formation. Pulsars can also strip the atmosphere off from a star, leaving a planetary-mass remnant, which may be understood as a chthonian planet or a stellar object depending on interpretation. For pulsars, such pulsar planets can be detected with the pulsar timing method, which allows for high At the meeting of the American Physical Society in December 1933 (the proceedings were published in January 1934), Walter Baade and Fritz Zwicky proposed the existence of neutron stars, less than two years after the discovery of the neutron by James Chadwick. In seeking an explanation for the origin of a supernova, they tentatively proposed that in supernova explosions ordinary stars are turned into stars that consist of extremely closely packed neutrons that they called neutron stars. Baade and Zwicky correctly proposed at that time that the release of the gravitational binding energy of the neutron stars powers the supernova: "In the supernova process, mass in bulk is annihilated". Neutron stars were thought to be too faint to be detectable and little work was done on them until November 1967, when Franco Pacini pointed out that if the neutron stars were spinning and had large magnetic fields, then electromagnetic waves would be emitted. Unbeknown to him, radio astronomer Antony Hewish and his research assistant Jocelyn Bell at Cambridge were shortly to detect radio pulses from stars that are now believed to be highly magnetized, rapidly spinning neutron stars, known as pulsars. In 1965, Antony Hewish and Samuel Okoye discovered "an unusual source of high radio brightness temperature in the Crab Nebula". This source turned out to be the Crab Pulsar that resulted from the great supernova of 1054. In 1967, Iosif Shklovsky examined the X-ray and optical observations of Scorpius X-1 and correctly concluded that the radiation comes from a neutron star at the stage of accretion. In 1967, Jocelyn Bell Burnell and Antony Hewish discovered regular radio pulses from PSR B1919+21. This pulsar was later interpreted as an isolated, rotating neutron star. The energy source of the pulsar is the rotational energy of the neutron star. The majority of known neutron stars (about 2000, as of 2010) have been discovered as pulsars, emitting regular radio pulses. In 1971, Riccardo Giacconi, Herbert Gursky, Ed Kellogg, R. Levinson, E. Schreier, and H. Tananbaum discovered 4.8 second pulsations in an X-ray source in the constellation Centaurus, Cen X-3. They interpreted this as resulting from a rotating hot neutron star. The energy source is gravitational and results from a rain of gas falling onto the surface of the neutron star from a companion star or the interstellar medium. In 1974, Antony Hewish was awarded the Nobel Prize in Physics "for his decisive role in the discovery of pulsars" without Jocelyn Bell who shared in the discovery. In 1974, Joseph Taylor and Russell Hulse discovered the first binary pulsar, PSR B1913+16, which consists of two neutron stars (one seen as a pulsar) orbiting around their center of mass. Albert Einstein's general theory of relativity predicts that massive objects in short binary orbits should emit gravitational waves, and thus that their orbit should decay with time. This was indeed observed, precisely as general relativity predicts, and in 1993, Taylor and Hulse were awarded the Nobel Prize in Physics for this discovery. In 1982, Don Backer and colleagues discovered the first millisecond pulsar, PSR B1937+21. This object spins 642 times per second, a value that placed fundamental constraints on the mass and radius of neutron stars. Many millisecond pulsars were later discovered, but PSR B1937+21 remained the fastest-spinning known pulsar for 24 years, until PSR J1748-2446ad (which spins more than 700 times a second) was discovered. In 2003, Marta Burgay and colleagues discovered the first double neutron star system where both components are detectable as pulsars, PSR J0737−3039. The discovery of this system allows a total of 5 different tests of general relativity, some of these with unprecedented precision. In 2010, Paul Demorest and colleagues measured the mass of the millisecond pulsar PSR J1614−2230 to be, using Shapiro delay. This was substantially higher than any previously measured neutron star mass (, see PSR J1903+0327), and places strong constraints on the interior composition of neutron stars. In 2013, John Antoniadis and colleagues measured the mass of PSR J0348+0432 to be, using white dwarf spectroscopy. This confirmed the existence of such massive stars using a different method. Furthermore, this allowed, for the first time, a test of general relativity using such a massive neutron star. In August 2017, LIGO and Virgo made first detection of gravitational waves produced by colliding neutron stars. In October 2018, astronomers reported that GRB 150101B, a gamma-ray burst event detected in 2015, may be directly related to the historic GW170817 and associated with the merger of two neutron stars. The similarities between the two events, in terms of gamma ray, optical and x-ray emissions, as well as to the nature of the associated host galaxies, are "striking", suggesting the two separate events may both be the result of the merger of neutron stars, and both may be a kilonova, which may be more common in the universe than previously understood, according to the researchers. In July 2019, astronomers reported that a new method to determine the Hubble constant, and resolve the discrepancy of earlier methods, has been proposed based on the mergers of pairs of neutron stars, following the detection of the neutron star merger of GW170817. Their measurement of the Hubble constant is (km/s)/Mpc.
A neutron star is the collapsed core of a giant star, which before collapse had a total mass of between 10 and 29 solar masses. Neutron stars are the smallest and densest stars, excluding black holes and hypothetical white holes, quark stars, and strange stars. Neutron stars have a radius on the order of and a mass of about 1.4 solar masses. They result from the supernova explosion of a massive star, combined with gravitational collapse, that compresses the core past white dwarf star density to that of atomic nuclei.
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summarize: The first white dwarf discovered was in the triple star system of 40 Eridani, which contains the relatively bright main sequence star 40 Eridani A, orbited at a distance by the closer binary system of the white dwarf 40 Eridani B and the main sequence red dwarf 40 Eridani C. The pair 40 Eridani B/C was discovered by William Herschel on 31 January 1783. In 1910, Henry Norris Russell, Edward Charles Pickering and Williamina Fleming discovered that, despite being a dim star, 40 Eridani B was of spectral type A, or white. In 1939, Russell looked back on the discovery: I was visiting my friend and generous benefactor, Prof. Edward C. Pickering. With characteristic kindness, he had volunteered to have the spectra observed for all the stars — including comparison stars — which had been observed in the observations for stellar parallax which Hinks and I made at Cambridge, and I discussed. This piece of apparently routine work proved very fruitful — it led to the discovery that all the stars of very faint absolute magnitude were of spectral class M. In conversation on this subject (as I recall it), I asked Pickering about certain other faint stars, not on my list, mentioning in particular 40 Eridani B. Characteristically, he sent a note to the Observatory office and before long the answer came (I think from Mrs. Fleming) that the spectrum of this star was A. I knew enough about it, even in these paleozoic days, to realize at once that there was an extreme inconsistency between what we would then have called "possible" values of the surface brightness and density. I must have shown that I was Although white dwarfs are known with estimated masses as low as 0.17 and as high as 1.33, the mass distribution is strongly peaked at 0.6, and the majority lie between 0.5 and 0.7. The estimated radii of observed white dwarfs are typically 0.8–2% the radius of the Sun; this is comparable to the Earth's radius of approximately 0.9% solar radius. A white dwarf, then, packs mass comparable to the Sun's into a volume that is typically a million times smaller than the Sun's; the average density of matter in a white dwarf must therefore be, very roughly, 1,000,000 times greater than the average density of the Sun, or approximately 10 g/cm, or 1 tonne per cubic centimetre. A typical white dwarf has a density of between 10 and 10 g/cm. White dwarfs are composed of one of the densest forms of matter known, surpassed only by other compact stars such as neutron stars, quark stars (hypothetically), and black holes. White dwarfs were found to be extremely dense soon after their discovery. If a star is in a binary system, as is the case for Sirius B or 40 Eridani B, it is possible to estimate its mass from observations of the binary orbit. This was done for Sirius B by 1910, yielding a mass estimate of, which compares well with a more modern estimate of. Since hotter bodies radiate more energy than colder ones, a star's surface brightness can be estimated from its effective surface temperature, and that from its spectrum. If the star's distance is known, its absolute luminosity can also be estimated. From the absolute luminosity and distance, the star's surface area and its radius can be calculated. Reasoning of this sort led to the realization, puzzling to astronomers at the time, that Sirius B and 40 Eridani B must be very dense. When Ernst Öpik estimated the density of a number of visual binary stars in 1916, he found that 40 Eridani B had a density of over 25,000 times the Sun's, which was so high that he called it "impossible". As Arthur Stanley Eddington put it later in 1927: We learn about the stars by receiving and interpreting the messages which their light brings to us. The message of the companion of Sirius when it was decoded ran: "I am composed of material 3,000 times denser than anything you have ever come across; a ton of my material would be a little nugget that you could put in a matchbox." What reply can one make to such a message? The reply which most of us made in 1914 was — "Shut up. Don't talk nonsense." As Eddington pointed out in 1924, densities of this order implied that, according to the theory of general relativity, the light from Sirius B should be gravitationally redshifted. This was confirmed when Adams measured this redshift in 1925. Such densities are possible because white dwarf material is not composed of atoms joined by chemical bonds, but rather consists of a plasma of unbound nuclei and electrons. There is therefore no obstacle to placing nuclei closer than normally allowed by electron orbitals limited by normal matter. Eddington wondered what would happen when this plasma cooled and the energy to keep the atoms ionized was no longer sufficient. This paradox was resolved by R. H. Fowler in 1926 by an application of the newly devised quantum mechanics. Since electrons obey the Pauli exclusion principle, no two electrons can occupy the same state, and they must obey Fermi–Dirac statistics, also introduced in 1926 to determine the statistical distribution of particles which satisfy the Pauli exclusion principle. At zero temperature, therefore, electrons can not all occupy the lowest-energy, or "ground", state; some of them would have to occupy higher-energy states, forming a band of lowest-available energy states, the "Fermi sea". This state of the electrons, called "degenerate", meant that a white dwarf could cool to zero temperature and still possess high energy. Compression of a white dwarf will increase the number of electrons in a given volume. Applying the Pauli exclusion principle, this will increase the kinetic energy of the electrons, thereby increasing the pressure. This "electron degeneracy pressure" supports a white dwarf against gravitational collapse. The pressure depends only on density and not on temperature. Degenerate matter is relatively compressible; this means that the density of a high-mass white dwarf is much greater than that of a low-mass white dwarf and that the radius of a white dwarf decreases as its mass increases. The existence of a limiting mass that no white dwarf can exceed without collapsing to a neutron star is another consequence of being supported by electron degeneracy pressure. Such limiting masses were calculated for cases of an idealized, constant density star in 1929 by Wilhelm Anderson and in 1930 by Edmund C. Stoner. This value was corrected by considering hydrostatic equilibrium for the density profile, and the presently known value of the limit was first published in 1931 by Subrahmanyan Chandrasekhar in his paper "The Maximum Mass of Ideal White Dwarfs". For a non-rotating white dwarf, it is equal to approximately, where is the average molecular weight per electron of the star. As the carbon-12 and oxygen-16 which predominantly compose a carbon–oxygen white dwarf both have atomic number equal to half their atomic weight, one should take equal to 2 for such a star, leading to the commonly quoted value of 1.4. (Near the beginning of the 20th century, there was reason to believe that stars were composed chiefly of heavy elements, so, in his 1931 paper, Chandrasekhar set the average molecular weight per electron,, equal to 2.5, giving a limit of 0.91.) Together with William Alfred Fowler, Chandrasekhar received the Nobel prize for this and other work in 1983. The limiting mass is now called the "Chandrasekhar limit". If a white dwarf were to exceed the Chandrasekhar limit, and nuclear reactions did not take place, the pressure exerted by electrons would no longer be able to balance the force of gravity, and it would collapse into a denser object called a neutron star. Carbon–oxygen white dwarfs accreting mass from a neighboring star undergo a runaway nuclear fusion reaction, which leads to a Type Ia supernova explosion in which the white dwarf may be destroyed, before it reaches the limiting mass. New research indicates that many white dwarfs—at least in certain types of galaxies — may not approach that limit by way of accretion. It has been postulated that at least some of the white dwarfs that become supernovae attain the necessary mass by colliding with one another. It may be that in elliptical galaxies such collisions are the major source of supernovae. This hypothesis is based on the fact that the X-rays produced by those galaxies are 30 to 50 times less than what is expected to be produced by type Ia supernovas of that galaxy as matter accretes on the white dwarf from its encircling companion. It has been concluded that no more than 5 percent of the supernovae in such galaxies could be created by the process of accretion onto white dwarfs. The significance of this finding is that there could be two types of supernovae, which could mean that the Chandrasekhar limit might not always apply in determining when a white dwarf goes supernova, given that two colliding white dwarfs could have a range of masses. This in turn would confuse efforts to use exploding white dwarfs as standard candles in determining distances. White dwarfs have low luminosity and therefore occupy a strip at the bottom of the Hertzsprung–Russell diagram, a graph of stellar luminosity versus color or temperature. They should not be confused with low-luminosity objects at the low-mass end of the main sequence, such as the hydrogen-fusing red dwarfs, whose cores are supported in part by thermal pressure, or the even lower-temperature brown dwarfs. Early calculations suggested that there might be white dwarfs whose luminosity varied with a period of around 10 seconds, but searches in the 1960s failed to observe this. The first variable white dwarf found was HL Tau 76; in 1965 and 1966, and was observed to vary with a period of approximately 12.5 minutes. The reason for this period being longer than predicted is that the variability of HL Tau 76, like that of the other pulsating variable white dwarfs known, arises from non-radial gravity wave pulsations. Known White dwarfs are thought to represent the end point of stellar evolution for main-sequence stars with masses from about 0.07 to 10. The composition of the white dwarf produced will depend on the initial mass of the star. Current galactic models suggest the Milky Way galaxy currently contains about ten billion white dwarfs. If the mass of a main-sequence star is lower than approximately half a solar mass, it will never become hot enough to fuse helium in its core. It is thought that, over a lifespan that considerably exceeds the age of the Universe (c. 13.8 billion years), such a star If the mass of a main-sequence star is between 0.5 and 8 like our sun, its core will become sufficiently hot to fuse helium into carbon and oxygen via the triple-alpha process, but it will never become sufficiently hot to fuse carbon into neon. Near the end of the period in which it If a star is massive enough, its core will eventually become sufficiently hot to fuse carbon to neon, and then to fuse neon to iron. Such a star will not become a white dwarf, because the mass of its central, non-fusing core, initially supported by electron degeneracy pressure, will eventually exceed the largest possible mass supportable by degeneracy pressure. At this point the core of the star will collapse and it will explode in a core-collapse supernova which will leave behind a remnant neutron star, black hole, or possibly Type Iax supernova, that involve helium accretion by a white dwarf, have been proposed to be a channel for transformation of this type of stellar remnant. In this scenario, the carbon detonation produced in a Type Ia supernova is too weak to destroy the white dwarf, expelling just a small part A white dwarf is stable once formed and will continue to cool almost indefinitely, eventually to become a black dwarf. Assuming that the Universe continues to expand, it is thought that in 10 to 10 years, the galaxies will evaporate as their stars escape into intergalactic space. White dwarfs should generally survive galactic dispersion, although an occasional collision between white dwarfs may produce a new fusing star or a super-Chandrasekhar mass white dwarf which will explode in a Type Ia supernova. The subsequent lifetime of white dwarfs is thought to be on the order of the hypothetical A white dwarf's stellar and planetary system is inherited from its progenitor star and may interact with the white dwarf in various ways. Infrared spectroscopic observations made by NASA's Spitzer Space Telescope of the central star of the Helix Nebula suggest the presence of a dust cloud, which may be caused by cometary collisions. It is possible that infalling material from this may cause X-ray emission from the central star. Similarly, observations made in 2004 indicated the presence of a dust cloud around the young (estimated to have formed from its AGB progenitor about 500 million years ago) white dwarf G29-38, which may have been created by tidal disruption of a comet passing close to the white dwarf. Some estimations based on the metal content of the atmospheres of the white dwarfs consider that at least 15% of them may be orbited by planets and/or asteroids, or at least their debris. Another suggested idea is that white dwarfs could be orbited by the stripped cores of rocky planets, that would have survived the red giant phase of their star but losing their outer layers and, given those planetary remnants would likely be made of metals, to attempt to detect them looking for the signatures of their interaction with the white dwarf's magnetic field. Other suggested ideas of how white dwarfs are polluted with dust involve the scattering of asteroids by planets or via planet-planet scattering. Liberation of exomoons from their host planet could cause white dwarf pollution with dust. It has been proposed that white dwarfs with surface temperatures of less than 10,000 Kelvins could harbor a habitable zone at a distance of c. 0.005 to 0.02 AU that would last upwards of 3 billion years. This is so close that any habitable planets would be tidally locked. The goal is to search for transits of hypothetical Earth-like planets that could have migrated inward and/or formed there. As a white dwarf has a size similar to that of a planet, these kinds of transits would produce strong eclipses. Newer research casts some doubts on this idea, If a white dwarf is in a binary star system and is accreting matter from its companion, a variety of phenomena may occur, including novae and Type Ia supernovae. It may also be a super-soft x-ray source if it is able to take material from its companion fast enough to sustain fusion on its surface. A close binary system of two white dwarfs can radiate energy in the form of gravitational waves, causing their mutual orbit to steadily shrink until the stars merge. The mass of an isolated, nonrotating white dwarf cannot exceed the Chandrasekhar limit of ~1.4. This limit may increase if the white dwarf is rotating rapidly and nonuniformly. White dwarfs in binary systems can accrete material from a companion star, increasing both their mass and their density. As their mass approaches the Chandrasekhar limit, this could theoretically lead to either the explosive ignition of fusion in the white dwarf or its collapse into a neutron star. Accretion provides the currently favored mechanism called the "single-degenerate model" for Type Ia supernovae. In this model, a carbon–oxygen white dwarf accretes mass and compresses its core by pulling mass from a companion star. It is believed that compressional heating of the core leads to ignition of carbon fusion as the mass approaches the Chandrasekhar limit. Because the white dwarf is supported against gravity by quantum degeneracy A post-common envelope binary (PCEB) is a binary consisting out of a white dwarf and a closely tidally locked red dwarf (in other cases this might be a brown dwarf instead of a red dwarf). These binaries form when the red dwarf is engulfed in the red giant phase and as the red dwarf orbits inside the common envelope it is slowed down in the more dense environment. This slowed orbital speed is compensated with Before accretion of material pushes a white dwarf close to the Chandrasekhar limit, accreted hydrogen-rich material on the surface may ignite in a less destructive type of thermonuclear explosion powered by hydrogen fusion. These surface explosions can be repeated as long as the white dwarf's core remains intact. This weaker kind of repetitive cataclysmic phenomenon is called a (classical) nova. Astronomers have also observed dwarf novae, which have Other non-pro-supernova binaries include binaries that consist out of a main sequence star (or giant) and a white dwarf. The binary Sirius AB is probably the most famous example. White dwarfs can also exist as binaries or multiple star systems that only consist out of white dwarfs. An example
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to that of the Sun, while its volume is comparable to that of Earth. A white dwarf's faint luminosity comes from the emission of stored thermal energy; no fusion takes place in a white dwarf. The nearest known white dwarf is Sirius B, at 8.6 light years, the smaller component of the Sirius binary star. There are currently thought to be eight white dwarfs among the hundred star systems nearest the Sun. The unusual faintness of white dwarfs was first recognized in 1910. The name "white dwarf" was coined by Willem Luyten in 1922.
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summarize: A white dwarf is what remains of a main-sequence star of low or medium mass (below approximately 9 to 10 solar masses ()) after it has either expelled or fused all the elements for which it has sufficient temperature to fuse. What is left is then a dense sphere of electron-degenerate matter that cools slowly by thermal radiation, eventually becoming a black dwarf. If black dwarfs were to exist, they would be extremely difficult to detect, because, by definition, they would emit very little radiation. They would, however, be detectable through their gravitational influence. Various white dwarfs cooled below 3900 K (M0 spectral class) were found in 2012 by astronomers using MDM Observatory's 2.4 meter telescope. They are estimated to be 11 to 12 billion years old. Because the far-future evolution of stars depends on physical questions which are poorly understood, such as the nature of dark matter and the possibility and rate of proton decay, it is not known precisely how long it will take white dwarfs to cool to blackness. Barrow and Tipler estimate that it would take 10 years for a white dwarf to cool to 5 K; however, if weakly interacting massive particles (WIMPs) exist, it is possible that interactions with these particles will keep some white dwarfs much warmer than this for approximately 10 years. If protons are not stable, white dwarfs will also be kept warm by energy released from proton decay. For a hypothetical proton lifetime of 10 years, Adams and Laughlin calculate that proton decay will raise the effective surface temperature of an old one-solar-mass white dwarf to approximately 0.06 K. Although cold, this is thought to be hotter than the cosmic background radiation temperature 10 years in the future. Once the Sun stops fusing helium in its core and ejects its layers in a planetary nebula in about 8 billion years, it will become a white dwarf and, over trillions of years time, eventually will no longer emit any light. After that, the Sun will not be visible to the equivalent of the naked human eye, removing it from optical view even if the gravitational effects are evident. The estimated time for the Sun to cool enough to become a black dwarf is about 10 (1 quadrillion) years, though it could take much longer than this, if weakly interacting massive particles (WIMPs) exist, as described above.
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light. Because the time required for a white dwarf to reach this state is calculated to be longer than the current age of the universe (13.8 billion years), no black dwarfs are expected to exist in the universe now, and the temperature of the coolest white dwarfs is one observational limit on the age of the universe.
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summarize: The word "comet" derives from the Old English "cometa" from the Latin "comēta" or "comētēs". That, in turn, is a latinization of the Greek κομήτης ("wearing long hair"), and the "Oxford English Dictionary" notes that the term (ἀστὴρ) κομήτης The solid, core structure of a comet is known as the nucleus. Cometary nuclei are composed of an amalgamation of rock, dust, water ice, and frozen carbon dioxide, carbon monoxide, methane, and ammonia. As such, they are popularly described as "dirty snowballs" after Fred Whipple's model. However, many comets have a higher dust content, leading them to be called "icy dirtballs". The term "icy dirtballs" arose after observation of Comet 9P/Tempel 1 collision with an "impactor" probe sent by NASA Deep Impact mission in July 2005. Research conducted in 2014 suggests that comets are The streams of dust and gas thus released form a huge and extremely thin atmosphere around the comet called the "coma". The force exerted on the coma by the Sun's radiation pressure and solar wind cause an enormous "tail" to form pointing away from the Sun. The coma is generally made of water and dust, with water making up to 90% of the volatiles that outflow from the nucleus when the comet is within of the Sun. The parent molecule is destroyed primarily through photodissociation and to a much smaller extent photoionization, with the solar wind playing a minor role in the destruction of water compared to photochemistry. Larger dust particles are left along the comet's orbital path whereas smaller particles are pushed away from the Sun into the comet's tail by light pressure. Although the solid nucleus of comets is generally less than across, the coma may be thousands or millions of kilometers across, sometimes becoming larger than the Sun. For example, about a month after an outburst in October 2007, comet 17P/Holmes briefly had a tenuous dust atmosphere larger than the Sun. Bow shocks form as a result of the interaction between the solar wind and the cometary ionosphere, which is created by ionization of gases in the coma. As the comet approaches the Sun, increasing outgassing rates cause the coma to expand, and the sunlight ionizes gases in the coma. When the solar wind passes through this ion coma, the bow shock appears. The first observations were made in the 1980s and 90s as In the outer Solar System, comets remain frozen and inactive and are extremely difficult or impossible to detect from Earth due to their small size. Statistical detections of inactive comet nuclei in the Kuiper belt have been reported from observations by the Hubble Space Telescope but these detections have been questioned. As a comet approaches the inner Solar System, solar radiation causes the volatile materials within the comet to vaporize and stream out of the nucleus, carrying dust away with them. The streams of dust and gas each form their own distinct tail, pointing in slightly different directions. The tail of dust is left behind in the comet's orbit in such a manner that it often forms a curved tail called the type II or dust tail. At the same time, the ion or type I tail, made of gases, always points directly away from the Sun because this gas is more strongly affected by the solar wind than is dust, following magnetic field lines rather than an orbital trajectory. On occasions—such as when Earth passes through a comet's Uneven heating can cause newly generated gases to break out of a weak spot on the surface of comet's nucleus, like a geyser. These streams of gas and dust can cause Most comets are small Solar System bodies with elongated elliptical orbits that take them close to the Sun for a part of their orbit and then out into the further reaches of the Solar System for the remainder. Comets are often classified according to the length of their orbital periods: The longer the period the more elongated the ellipse. Periodic comets or short-period comets are generally defined as those having orbital periods of less than 200 years. They usually orbit more-or-less in the ecliptic plane in the same direction as the planets. Their orbits typically take them out to the region of the outer planets (Jupiter and beyond) at aphelion; for example, the aphelion of Halley's Comet is a little beyond the orbit of Neptune. Comets whose aphelia are near a major planet's orbit are called its "family". Such families are thought to arise from the planet capturing formerly long-period comets into shorter orbits. At the shorter orbital period extreme, Encke's Comet has an orbit that does not reach the orbit of Jupiter, and is known as an Encke-type comet. Short-period comets with orbital periods less than 20 years and low inclinations (up to 30 degrees) to the ecliptic are called traditional Jupiter-family comets (JFCs). Those like Halley, with orbital periods of between 20 and 200 years and inclinations extending from zero to more than 90 degrees, are called Halley-type comets (HTCs)., 91 HTCs have been observed, compared with 685 identified JFCs. Recently discovered main-belt comets form a distinct class, orbiting Long-period comets have highly eccentric orbits and periods ranging from 200 years to thousands of years. An eccentricity greater than 1 when near perihelion does not necessarily mean that a comet will leave the Solar System. For example, Comet McNaught had a heliocentric osculating eccentricity of 1.000019 near its perihelion passage epoch in January 2007 but is bound to the Sun with roughly a 92,600-year orbit because the eccentricity drops below 1 as it moves farther from the Sun. The future orbit of a long-period comet is properly obtained when the osculating orbit is computed at an epoch after leaving the planetary region The Oort cloud is thought to occupy a vast space starting from between to as far as from the Sun. This cloud encases the celestial bodies that start at the middle of our solar system—the sun, all the way to outer limits of the Kuiper Belt. The Oort cloud consists of viable materials necessary for the creation of celestial bodies. The planets we have today, exist only because of the planetesimals (chunks of leftover space that assisted in the creation of planets) that were condensed and formed by the gravity of the sun. The eccentric made from these trapped Exocomets beyond the Solar System have also been detected and may be common in the Milky Way. The first exocomet system detected was around a star named Beta Pictoris, a very young sitting at around 20 million years old A-type main-sequence star, in 1987. A total of 11 such exocomet systems have been identified, using the absorption spectrum caused by the large clouds of gas emitted by comets when passing close to their star. For ten years the Kepler Space Telescope was responsible for searching for planets and other forms outside of the solar system. The first As a comet is heated during close passes to the Sun, outgassing of its icy components also releases solid debris too large to be swept away by radiation pressure and the solar wind. If Earth's orbit sends it through that trail of debris, which is composed mostly of fine grains of rocky material, there is Many comets and asteroids collided with Earth in its early stages. Many scientists think that comets bombarding the young Earth about 4 billion years ago brought the vast quantities of water that now fill Earth's oceans, or at least a significant portion of it. Others have cast doubt on this idea. The detection of organic molecules, including polycyclic aromatic hydrocarbons, in significant quantities in comets has led to speculation that comets or meteorites may have brought the precursors of life—or even life itself—to Earth. In 2013 it was suggested that impacts between rocky Fear of comets as acts of God and signs of impending doom was highest in Europe from AD 1200 to 1650. The year after the Great Comet of 1618, for example, Gotthard Arthusius published a pamphlet stating that it was a sign that the Day of Judgment was near. He listed ten pages of comet-related disasters, including "earthquakes, floods, changes in river courses, hail storms, hot and dry weather, poor harvests, epidemics, war and treason If a comet is traveling fast enough, it may leave the Solar System. Such comets follow the open path of a hyperbola, and as such they are called hyperbolic comets. To date, comets are only known Jupiter-family comets and long-period comets appear to follow very different fading laws. The JFCs are active over a lifetime of about 10,000 years or ~1,000 orbits whereas long-period comets fade much faster. Only 10% of the long-period comets survive more than 50 passages to The nucleus of some comets may be fragile, a conclusion supported by the observation of comets splitting apart. A significant cometary disruption was that of Comet Shoemaker–Levy 9, which was discovered in 1993. A close encounter in July 1992 had broken it into pieces, and over a period of six days in July 1994, these pieces fell into Jupiter's atmosphere—the first time astronomers had observed a collision between two objects in the Solar System. Other splitting comets include 3D/Biela in 1846 and 73P/Schwassmann–Wachmann from 1995 to 2006. Greek historian Ephorus reported that a comet split apart as far back as the winter of 372–373 BC. Comets are suspected of splitting due to thermal stress, internal gas pressure, or impact. Comets 42P/Neujmin and 53P/Van Biesbroeck appear to be fragments of a The names given to comets have followed several different conventions over the past two centuries. Prior to the early 20th century, most comets were simply referred to by the year when they appeared, sometimes with additional adjectives for particularly bright comets; thus, the "Great Comet of 1680", the "Great Comet of 1882", and the "Great January Comet of 1910". After Edmund Halley demonstrated that the comets of 1531, 1607, and 1682 were the same body and successfully predicted its return in 1759 by calculating its From ancient sources, such as Chinese oracle bones, it is known that comets have been noticed by humans for millennia. Until the sixteenth century, comets were usually considered bad omens of deaths of kings or noble men, or coming catastrophes, or even interpreted as attacks by heavenly beings against terrestrial inhabitants. In the 11th century Bayeux Tapestry, Halley's Comet is depicted portending the death of Harold and the triumph of the Normans at the Battle of Hastings. According to Norse Mythology, comets were actually a part of the Giant Ymir's skull. According to the tale, Odin and his brothers slew Ymir and set about constructing the world (Earth) from his corpse. They fashioned the oceans from his blood, the soil from his skin and muscles, vegetation from his hair, clouds from his Isaac Newton, in his "Principia Mathematica" of 1687, proved that an object moving under the influence of gravity must trace out an orbit shaped like one of the conic sections, and he demonstrated how to fit a comet's path through the sky to a parabolic orbit, using the comet of 1680 as an example. Newton was one of the first to contribute to the physical understanding of the nature of comets. In 1705, Edmond Halley (1656–1742) applied Newton's method to twenty-three cometary apparitions that had occurred between 1337 and 1698. He noted that three of these, the comets of 1531, 1607, and 1682, had very similar orbital elements, and he was further able to account for the slight differences in their orbits in terms of gravitational perturbation caused by Jupiter and Saturn. Confident that Isaac Newton described comets as compact and durable solid bodies moving in oblique orbit and their tails as thin streams of vapor emitted by their nuclei, ignited or heated by the Sun. Newton suspected that comets were the origin of the life-supporting component of air. As early as the 18th century, some scientists had made correct hypotheses as to comets' physical composition. In 1755, Immanuel Kant hypothesized that comets are composed of some volatile substance, whose vaporization gives rise to their brilliant displays near perihelion. In 1836, the German mathematician Friedrich Wilhelm Bessel, after observing streams of vapor during the appearance of Halley's Comet in 1835, proposed that the jet forces of evaporating material could be great enough to significantly alter a comet's orbit, and he argued that the non-gravitational movements of Encke's Comet Approximately once a decade, a comet becomes bright enough to be noticed by a casual observer, leading such comets to be designated as great comets. Predicting whether a comet will become a great comet is notoriously difficult, as many factors may cause a comet's brightness to depart drastically from predictions. Broadly speaking, if a comet has a large and active nucleus, will pass close to the Sun, and is not obscured by the Sun as seen from Earth when at its brightest, it has a chance of becoming a great comet. However, Comet Kohoutek in 1973 fulfilled all the criteria and was A sungrazing comet is a comet that passes extremely close to the Sun at perihelion, generally within a few million kilometers. Although small sungrazers can be completely evaporated during such a close approach to the Sun, larger sungrazers can survive many perihelion passages. However, the strong tidal forces they experience often lead to their fragmentation. About 90% Of the thousands of known comets, some exhibit unusual properties. Comet Encke (2P/Encke) orbits from outside the asteroid belt to just inside the orbit of the planet Mercury whereas the Comet 29P/Schwassmann–Wachmann currently travels Centaurs typically behave with characteristics of both asteroids and comets. Centaurs can be classified as comets such as 60558 Echeclus, and 166P/NEAT. 166P/NEAT was discovered while it exhibited a coma, and so A comet may be discovered photographically using a wide-field telescope or visually with binoculars. However, even without access to optical equipment, it is still possible for the amateur astronomer to discover a sungrazing comet online by downloading images accumulated by some satellite observatories such as SOHO. SOHO's 2000th comet was discovered by Polish amateur astronomer Michał Kusiak on 26 December 2010 and both discoverers of Hale–Bopp used amateur equipment (although Hale was not an amateur). A number of periodic comets discovered in earlier decades or previous centuries are now lost comets. Their orbits were never known well enough to predict future appearances or the comets have disintegrated. However, occasionally a "new" The depiction of comets in popular culture is firmly rooted in the long Western tradition of seeing comets as harbingers of doom and as omens of world-altering change. Halley's Comet alone has caused a slew of sensationalist publications of all sorts at each of its reappearances. It was especially noted that the birth and death of some notable persons coincided with separate appearances of the comet, such as with writers Mark Twain (who correctly speculated that he'd "go out with the comet" in 1910) and Eudora Welty, to whose life Mary Chapin Carpenter dedicated the song "Halley Came to Jackson". In times past, bright comets often inspired panic and hysteria in the general population, being thought of as bad omens. More recently, during the passage of Halley's Comet in 1910, Earth passed through the comet's tail, and erroneous newspaper reports inspired a fear that cyanogen in the tail might poison millions, whereas the appearance of Comet Hale–Bopp in 1997 triggered the mass suicide of the Heaven's Gate cult. In science fiction, the impact of comets has been depicted as a threat overcome by technology and heroism (as in the 1998 films "Deep Impact" and "Armageddon"), or as a trigger of global apocalypse ("Lucifer's Hammer", 1979) or zombies ("Night of the Comet", 1984). In Jules Verne's "Off on a Comet" a group of people are stranded on a comet orbiting the Sun, while a large manned space expedition visits Halley's Comet in Sir Arthur C. Clarke's novel "".
A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch one astronomical unit. If sufficiently bright, a comet may be seen from Earth without the aid of a telescope and may subtend an arc of 30° (60 Moons) across the sky. Comets have been observed and recorded since ancient times by many cultures.
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summarize: The first pulsar was observed on November 28, 1967, by Jocelyn Bell Burnell and Antony Hewish. They observed pulses separated by 1.33 seconds that originated from the same location in the sky, and kept to sidereal time. In looking for explanations for the pulses, the short period of the pulses eliminated most astrophysical sources of radiation, such as stars, and since the pulses followed sidereal time, it could not be human-made radio frequency interference. When observations with another telescope confirmed the emission, it eliminated any sort of instrumental effects. At this point, Bell Burnell said of herself and Hewish that "we did not really believe that we had picked up signals from another civilization, but obviously the idea had crossed our minds and we had no proof that it was an entirely natural radio emission. It is an interesting problem—if one thinks one may have detected life elsewhere in the universe, how does one announce the results responsibly?" Even so, they nicknamed the signal LGM-1, for "little green men" (a playful name for intelligent beings of extraterrestrial origin). It was not until a second pulsating source was discovered in a different part of the sky that the "LGM hypothesis" was entirely abandoned. Their pulsar was later dubbed CP 1919, and is now known by a number of designators including PSR 1919+21 and PSR J1921+2153. Although CP 1919 emits in radio wavelengths, pulsars have subsequently been found to emit in visible light, X-ray, and gamma ray wavelengths. The word "pulsar" is a portmanteau of 'pulsating' and 'quasar', and first appeared in print in 1968: The existence of neutron stars was first proposed by Walter Baade and Fritz Zwicky in 1934, when they argued that a small, dense star consisting primarily of neutrons would result from a supernova. Based on the idea of magnetic flux conservation from magnetic main sequence stars, Lodewijk Woltjer proposed in 1964 that such neutron stars might contain magnetic fields as large as 10 to 10 G. In 1967, shortly before the discovery of pulsars, Franco Pacini suggested that a rotating neutron star with a magnetic field would emit radiation, and even noted that such energy could be pumped into a supernova remnant around a neutron star, such as the Crab Nebula. After the discovery of the first pulsar, Thomas Gold independently suggested a rotating neutron star model similar to that of Pacini, and explicitly argued that this model could explain the pulsed radiation observed by Bell Burnell and Hewish. The discovery of the Crab pulsar later in 1968 seemed to provide confirmation of the rotating neutron star model of pulsars. The Crab pulsar has a 33-millisecond pulse period, which was too short to be consistent with other proposed models for pulsar emission. Moreover, the Crab pulsar is so named because it is located at the center of the Crab Nebula, consistent with the 1933 prediction of Baade and Zwicky. In 1974, Antony Hewish and Martin Ryle became the first astronomers to be awarded the Nobel Prize in Physics, with the Royal Swedish Academy of Sciences noting that Hewish played a "decisive role in the discovery of pulsars". Considerable controversy is associated with the fact that Hewish was awarded the prize while Bell, who made the initial discovery while she was his PhD student, was not. Bell claims no bitterness upon this point, supporting the decision of the Nobel prize committee. In 1974, Joseph Hooton Taylor, Jr. and Russell Hulse discovered for the first time a pulsar in a binary system, PSR B1913+16. This pulsar orbits another neutron star with an orbital period of just eight hours. Einstein's theory of general relativity predicts that this system should emit strong gravitational radiation, causing the orbit to continually contract as it loses orbital energy. Observations of the pulsar soon confirmed this prediction, providing the first ever evidence of the existence of gravitational waves. As of 2010, observations of this pulsar continue to agree with general relativity. In 1993, the Nobel Prize in Physics was awarded to Taylor and Hulse for the discovery of this pulsar. In 1982, Don Backer led a group which discovered PSR B1937+21, a pulsar with a rotation period of just 1.6 milliseconds (38,500 rpm). Observations soon revealed that its magnetic field was much weaker than ordinary pulsars, while further discoveries cemented the idea that a new class of object, the "millisecond pulsars" (MSPs) had been found. MSPs are believed to be the end product of X-ray binaries. Owing to their extraordinarily rapid and stable rotation, MSPs can be used by astronomers as clocks rivaling the stability of the best atomic clocks on Earth. Factors affecting the arrival time of pulses at Earth by more than a few hundred nanoseconds can be easily detected and used to make precise measurements. Physical parameters accessible through pulsar timing include the 3D position of the pulsar, its proper motion, the electron content of the interstellar medium along the propagation path, the orbital parameters of any binary companion, the pulsar rotation period and its evolution with time. (These are computed from the raw timing data by Tempo, a computer program specialized for this task.) After these factors have been taken into account, deviations between the observed arrival times and predictions made using these parameters can be found and attributed to one of three possibilities: intrinsic variations in the spin period of the pulsar, errors in the realization of Terrestrial Time against which arrival times were measured, or the presence of background gravitational waves. Scientists are currently attempting to resolve these possibilities by comparing the deviations seen between several different pulsars, forming what is known as a pulsar timing array. The goal of these efforts is to develop a pulsar-based time standard precise enough to make the first ever direct detection of gravitational waves. In June 2006, the astronomer John Middleditch and his team at LANL announced the first prediction of pulsar glitches with observational data from the Rossi X-ray Timing Explorer. They used observations of the pulsar PSR J0537-6910. In 1992, Aleksander Wolszczan discovered the first extrasolar planets around PSR B1257+12. This discovery presented important evidence concerning the widespread existence of planets outside the Solar System, although it is very unlikely that any life form could survive in the environment of intense radiation near a pulsar. In 2016, AR Scorpii was identified as the first pulsar in which the compact object is a white dwarf instead of a neutron star. Because its moment of inertia is much higher than that of a neutron star, the white dwarf in this system rotates once every 1.97 minutes, far slower than neutron-star pulsars. The system displays strong pulsations from ultraviolet to radio wavelengths, powered by the spin-down of the strongly magnetized white dwarf. Initially pulsars were named with letters of the discovering observatory followed by their right ascension (e.g. CP 1919). As more pulsars were discovered, the letter code became unwieldy, and so the convention then arose of using the letters PSR (Pulsating Source of Radio) followed by the pulsar's right ascension and degrees of declination (e.g. PSR 0531+21) and sometimes declination to a tenth of a degree (e.g. PSR 1913+16.7). Pulsars appearing very close together sometimes have letters appended (e.g. PSR 0021−72C and PSR 0021−72D). The modern convention prefixes the older numbers with a B (e.g. PSR B1919+21), with the B meaning the coordinates are for the 1950.0 epoch. All new pulsars have a J indicating 2000.0 coordinates and also have declination including minutes (e.g. PSR J1921+2153). Pulsars that were discovered before 1993 tend to retain their B names rather than use their J names (e.g. PSR J1921+2153 is more commonly known as PSR B1919+21). Recently discovered pulsars only have a J name (e.g. PSR J0437−4715). All pulsars have a J name that provides more precise coordinates of its location in the sky. The events leading to the formation of a pulsar begin when the core of a massive star is compressed during a supernova, which collapses into a neutron star. The neutron star retains most of its angular momentum, and since it has only a tiny fraction of its progenitor's radius (and therefore its moment of inertia is sharply reduced), it is formed with very high rotation speed. A beam of radiation is emitted along the magnetic axis of the pulsar, which spins along with the rotation of the neutron star. The magnetic axis of the pulsar determines the direction of the electromagnetic beam, with the magnetic axis not necessarily being the same as its rotational axis. This misalignment causes the beam to be seen once for every rotation of the neutron star, which leads to the "pulsed" nature of its appearance. In rotation-powered pulsars, the beam originates from the rotational energy of the neutron star, which generates an electrical field from the movement of the very strong magnetic field, resulting in the acceleration of protons and electrons on the star surface and the creation of an electromagnetic beam emanating from the poles of the magnetic field. Observations by NICER of J0030-0451, both beams originate from hotspots located on the south pole and that there may be more than two such hotspots on that star. This rotation slows down over time as electromagnetic power is emitted. When a pulsar's spin period slows down sufficiently, the radio pulsar mechanism is believed to turn off (the so-called "death line"). This turn-off seems to take place after about 10–100 million years, which means of all the neutron stars born in the 13.6 billion year age of the universe, around 99% no longer pulsate. Though the general picture of pulsars as rapidly rotating neutron stars is widely accepted, Werner Becker of the Max Planck Institute for Extraterrestrial Physics said in 2006, "The theory of how pulsars emit their radiation is still in its infancy, even after nearly forty years of work." Three distinct classes of pulsars are currently known to astronomers, according to the source of the power of the electromagnetic radiation: Although all three classes of objects are neutron stars, their observable behavior and the underlying physics are quite different. There are, however, connections. For example, X-ray pulsars are probably old rotationally-powered pulsars that have already lost most of their power, and have only become visible again after their binary companions had expanded and began transferring matter on to the neutron star. The process of accretion can in turn transfer enough angular momentum to the neutron star to "recycle" it as a rotation-powered millisecond pulsar. As this matter lands on the neutron star, it is thought to "bury" the magnetic field of the neutron star (although the details are unclear), leaving millisecond pulsars with magnetic fields 1000–10,000 times weaker than average pulsars. This low magnetic field is less effective at slowing the pulsar's rotation, so millisecond pulsars live for billions of years, making them the oldest known pulsars. Millisecond pulsars are seen in globular clusters, which stopped forming neutron stars billions of years ago. Of interest to the study of the state of the matter in a neutron star are the "glitches" observed in the rotation velocity of the neutron star. This velocity is decreasing slowly but steadily, except by sudden variations. One model put forward to explain these glitches is that they are the result of "starquakes" that adjust the crust of the neutron star. Models where the glitch is due to a decoupling of the possibly superconducting interior of the star have also been advanced. In both cases, the star's moment of inertia changes, but its angular momentum does not, resulting in a change in rotation rate. When two massive stars are born close together from the same cloud of gas, they can form a binary system and orbit each other from birth. If those two stars are at least a few times as massive as our sun, their lives will both end in supernova explosions. The more massive star explodes first, leaving behind a neutron star. If the explosion does not kick the second star away, the binary system survives. The neutron star can now be visible as a radio pulsar, and it slowly loses energy and spins down. Later, the second star can swell up, allowing the neutron star to suck up its matter. The matter falling onto the neutron star spins it up and reduces its magnetic field. This is called "recycling" because it returns the neutron star to a quickly-spinning state. Finally, the second star also explodes in a supernova, producing another neutron star. If this second explosion also fails to disrupt the binary, a double neutron star binary is formed. Otherwise, the spun-up neutron star is left with no companion and becomes a "disrupted recycled pulsar", spinning between a few and 50 times per second. The discovery of pulsars allowed astronomers to study an object never observed before, the neutron star. This kind of object is the only place where the behavior of matter at nuclear density can be observed (though not directly). Also, millisecond pulsars have allowed a test of general relativity in conditions of an intense gravitational field. Pulsar maps have been included on the two "Pioneer" plaques as well as the "Voyager" Golden Record. They show the position of the Sun, relative to 14 pulsars, which are identified by the unique timing of their electromagnetic pulses, so that our position both in space and in time can be calculated by potential extraterrestrial intelligences. Because pulsars are emitting very regular pulses of radio waves, its radio transmissions do not require daily corrections. Moreover, pulsar positioning could create a spacecraft navigation system independently, or be used in conjunction with satellite navigation. Generally, the regularity of pulsar emission does not rival the stability of atomic clocks. They can still be used as external reference. For example, J0437-4715 has a period of 0.005757451936712637 s with an error of s. This stability allows millisecond pulsars to be used in establishing ephemeris time or in building pulsar clocks. "Timing noise" is the name for rotational irregularities observed in all pulsars. This timing noise is observable as random wandering in the pulse frequency or phase. It is unknown whether timing noise is related to pulsar glitches. The radiation from pulsars passes through the interstellar medium (ISM) before reaching Earth. Free electrons in the warm (8000 K), ionized component of the ISM and H II regions affect the radiation in two primary ways. The resulting changes to the pulsar's radiation provide an important probe of the ISM itself. Because of the dispersive nature of the interstellar plasma, lower-frequency radio waves travel through the medium slower than higher-frequency radio waves. The resulting delay in the arrival of pulses at a range of frequencies is directly measurable as the "dispersion measure" of the pulsar. The dispersion measure is the total column density of free electrons between the observer and the pulsar, where formula_2 is the distance from the pulsar to the observer and formula_3 is the electron density of the ISM. The dispersion measure is used to construct models of the free electron distribution in the Milky Way. Additionally, turbulence in the interstellar gas causes density inhomogeneities in the ISM which cause scattering of the radio waves from the pulsar. The resulting scintillation of the radio waves—the same effect as the twinkling of a star in visible light due to density variations in the Earth's atmosphere—can be used to reconstruct information about the small scale variations in the ISM. Due to the high velocity (up to several hundred km/s) of many pulsars, a single pulsar scans the ISM rapidly, which results in changing scintillation patterns over timescales of a few minutes. Pulsars orbiting within the curved space-time around Sgr A*, the supermassive black hole at the center of the Milky Way, could serve as probes of gravity in the strong-field regime. Arrival times of the pulses would be affected by special- and general-relativistic Doppler shifts and by the complicated paths that the radio waves would travel through the strongly curved space-time around the black hole. In order for the effects of general relativity to be measurable with current instruments, pulsars with orbital periods less than about 10 years would need to be discovered; such pulsars would orbit at distances inside 0.01 pc from Sgr A*. Searches are currently underway; at present, five pulsars are known to lie within 100 pc from Sgr A*. There are 3 consortia around the world which use pulsars to search for gravitational waves. In Europe, there is the European Pulsar Timing Array (EPTA); there is the Parkes Pulsar Timing Array (PPTA) in Australia; and there is the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) in Canada and the US. Together, the consortia form the International Pulsar Timing Array (IPTA). The pulses from Millisecond Pulsars (MSPs) are used as a system of Galactic clocks. Disturbances in the clocks will be measurable at Earth. A disturbance from a passing gravitational wave will have a particular signature across the ensemble of pulsars, and will be thus detected. The pulsars listed here were either the first discovered of its type, or represent an extreme of some type among the known pulsar population, such as having the shortest measured period.
A pulsar (from "pulse" and "-ar" as in quasar) is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. This radiation can be observed only when a beam of emission is pointing toward Earth (much like the way a lighthouse can be seen only when the light is pointed in the direction of an observer), and is responsible for the pulsed appearance of emission. Neutron stars are very dense, and have short, regular rotational periods. This produces a very precise interval between pulses that ranges from milliseconds to seconds for an individual pulsar. Pulsars are one of the candidates for the source of ultra-high-energy cosmic rays (see also centrifugal mechanism of acceleration).
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summarize: An ordinary Prague family, the Lavičkas, yearn for a cottage in the countryside. One of their friends has managed to get a country residence by living in a decommissioned mill. Another is building a house there from scratch and has hired a bricklayer—who lets his employer do all the work. A third has succeeded in buying a cottage but with its elderly former owners still in residence, and is trying to evict them by such means as digging a moat across the front door and stopping up their chimney. Undeterred by such obstacles, the Lavičkas visit a cottage belonging to a charismatic old farmer, Mr. Komárek (Josef Kemr), and are charmed by it, despite a few rotting floorboards and an odor of mildew. Mr. Komárek, to their surprise, offers to sell them the house, saying that he plans to sell his cow, sow no new crops, and move to Slovakia to live with his son. In the meantime, he will rent them a room. After Toník, a friend of Mr. Komárek's, puts a new floor in the spare bedroom, the Lavičkas move in. Their children almost immediately start addressing Mr. Komárek as Grandpa and join him in collecting eggs from the chickens and in listening to fairy tales read aloud on the radio. Fleas, free-roaming chickens, and a lack of electricity get on the nerves of Věra Lavičková, but her husband, Oldřich, remains smitten with country life. Unfortunately, Mr. Komárek shows no sign of selling his cow or taking any other steps toward vacating the premises. Oldřich even makes the alarming discovery that Mr. Komárek has a father who is ninety-two and still hearty. In the end the Lavičkas must accept that their life in the country will have to be a shared one.
Seclusion Near a Forest () is a 1976 Czechoslovak comedy film directed by Jiří Menzel. Filming took place near Radešice (the summerhouse scenes) and in Svatý Jan (the funeral and the bar fight).
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summarize: The term "binary" was first used in this context by Sir William Herschel in 1802, when he wrote: By the modern definition, the term "binary star" is generally restricted to pairs of stars which revolve around a common center of mass. Binary stars which can be resolved with a telescope or interferometric methods are known as "visual binaries". For most of the known visual binary stars one whole revolution has not been observed yet, they are observed to have travelled along a curved path or a partial arc. The more general term "double star" is used for pairs of stars which are seen to be close together in the sky. This distinction is rarely made in languages other than English. Double stars may be binary systems or may be merely two stars that appear to be close together in the sky but have vastly different true distances from the Sun. The latter are termed "optical doubles" or "optical pairs". Since the invention of the telescope, many pairs of double stars have been found. Early examples include Mizar and Acrux. Mizar, in the Big Dipper (Ursa Major), was observed to Binary stars are classified into four types according to the way in which they are observed: visually, by observation; spectroscopically, by periodic changes in spectral lines; photometrically, by changes in brightness caused by an eclipse; or astrometrically, by measuring a deviation in a star's position caused by an unseen companion. Any binary star can belong to several of these classes; for example, several spectroscopic binaries are also eclipsing binaries. A "visual binary" star is a binary star for which the angular separation between the two components is great enough to permit them to be observed as a double star in a telescope, or even high-powered binoculars. The angular resolution of the telescope is an important factor in the detection of visual binaries, and as better angular resolutions are applied to binary star observations, an increasing number of visual binaries will be detected. The relative brightness of the two stars is also an important factor, as glare from a bright star may make it difficult to detect the presence of a fainter component. The brighter star of a visual binary is the "primary" star, and the dimmer is Sometimes, the only evidence of a binary star comes from the Doppler effect on its emitted light. In these cases, the binary consists of a pair of stars where the spectral lines in the light emitted from each star shifts first towards the blue, then towards the red, as each moves first towards us, and then away from us, during its motion about their common center of mass, with the period of their common orbit. In these systems, the An "eclipsing binary star" is a binary star system in which the orbit plane of the two stars lies so nearly in the line of sight of the observer that the components undergo mutual eclipses. In the case where the binary is also a spectroscopic binary and the parallax of the system is known, the binary is quite valuable for stellar analysis. Algol, a triple star system in the constellation Perseus, contains the best-known example of an eclipsing binary. Eclipsing binaries are variable stars, not because the light of the individual components vary but because of the eclipses. The light curve of an eclipsing binary is characterized by periods of practically constant light, with periodic drops in intensity when one star passes in front of the other. The brightness may drop twice during the orbit, once when the secondary passes in front of the primary and once when the primary passes in front of the secondary. The deeper of the two eclipses is called the Nearby non-eclipsing binaries can also be photometrically detected by observing how the stars affect each other in three ways. The first is by observing extra light which the stars reflect from Astronomers have discovered some stars that seemingly orbit around an empty space. "Astrometric binaries" are relatively nearby stars which can be seen to wobble around a point in space, with no visible companion. The same mathematics used for ordinary binaries can be applied to infer the mass of the missing companion. The companion could be very dim, so that it is currently undetectable or masked by the glare of its primary, or it could be an object that emits little or no electromagnetic radiation, for example a neutron star. The visible star's position is carefully measured and detected to vary, due to the gravitational influence from its counterpart. The position of the star is repeatedly measured relative to more distant stars, and then checked for periodic shifts in position. Another classification is based on the distance between the stars, relative to their sizes: "Detached binaries" are binary stars where each component is within its Roche lobe, i.e. the area where the gravitational pull of the star itself is larger than that of the other component. The stars have no major effect on each other, and essentially evolve separately. Most binaries belong to this class. "Semidetached binary stars" are binary stars where When a binary system contains a compact object such as a white dwarf, neutron star or black hole, gas from the other (donor) star can accrete onto the compact object. This releases gravitational potential energy, causing the gas to become hotter and emit radiation. Cataclysmic variable stars, where the compact object is a white dwarf, are examples of such systems. In X-ray binaries, the compact object can be either a neutron star or a black hole. These binaries are classified as low-mass or high-mass Orbital periods can be less than an hour (for AM CVn stars), or a few days (components of Beta Lyrae), but also hundreds of thousands of years (Proxima Centauri around Alpha Centauri AB). The Applegate mechanism explains long term orbital period variations seen in certain eclipsing binaries. As a main-sequence star goes through an activity cycle, the outer layers of the star are subject to a magnetic torque changing the distribution of angular momentum, resulting in a change in the star's oblateness. The orbit of the stars in the binary pair is gravitationally The components of binary stars are denoted by the suffixes "A" and "B" appended to the system's designation, "A" denoting the primary and "B" the secondary. The suffix "AB" may be used to denote the pair (for example, the binary star α Centauri AB consists Double stars are also designated by an abbreviation giving the discoverer together with an index number. α Centauri, for The components of a binary star system may be While it is not impossible that some binaries might be created through gravitational capture between two single stars, given the very low likelihood of such an event (three objects being actually required, as conservation of energy rules out a single gravitating body capturing another) and the high number of binaries currently in existence, this cannot be the primary formation process. As a main-sequence star increases in size during its evolution, it may at some point exceed its Roche lobe, meaning that some of its matter ventures into a region where the gravitational pull of its companion star is larger than its own. The result is that matter will transfer from one star to another through a process known as Roche lobe overflow (RLOF), either being absorbed by direct impact or through an accretion disc. The mathematical point through which this transfer happens is called the first Lagrangian point. It is not uncommon that the accretion disc is the brightest (and thus sometimes the only visible) element of a binary star. If a star grows outside of its Roche lobe too fast for all It is also possible for widely separated binaries to lose gravitational contact with each other during their lifetime, as a result of external perturbations. The components will then move on to evolve as single stars. A close encounter between two binary systems can also result in the gravitational disruption of both systems, with some of the stars being ejected at high velocities, leading to runaway stars. If a white dwarf has a close companion star that overflows its Roche lobe, the white dwarf will steadily accrete gases from the star's outer atmosphere. These are compacted on the white Binaries provide the best method for astronomers to determine the mass of a distant star. The gravitational pull between them causes them to orbit around their common center of mass. From the orbital pattern of a visual binary, or the time variation of the spectrum of a spectroscopic binary, the mass of its stars can be determined, for example with the binary mass function. In this way, the relation between a star's appearance (temperature and radius) and its mass can be found, which allows for the determination of the mass of non-binaries. Because a large proportion of stars exist in binary systems, binaries are particularly important to our understanding of the processes by which stars form. In particular, the period and masses of the binary tell us about the amount of angular momentum in the system. Because this is a conserved quantity in physics, binaries give us important clues about the conditions under which the stars were formed. In a simple binary case, "r", the distance from the center of the first star to the center of mass or barycenter, is given by: where: If "a" is taken to be the semi-major axis of the orbit The position of the red cross indicates the center It is estimated that approximately one third of the star systems in the Milky Way are binary or multiple, with the remaining two thirds being single stars. The overall multiplicity frequency of ordinary stars is a monotonically increasing function of stellar mass. That is, the likelihood of being in a binary or a multi-star system steadily increases as the masses of the components increase. There is a direct correlation between the period of revolution of a binary star and the eccentricity of its orbit, with systems of short period having smaller eccentricity. Binary stars may be found with any conceivable separation, from pairs orbiting so closely that they are practically in contact with each other, to pairs so distantly separated that their connection is indicated only by their common proper motion through space. Among gravitationally bound binary star systems, there exists a so-called log normal distribution of periods, with the majority of these systems orbiting with a period of about The large distance between the components, as well as their difference in color, make Albireo one of the easiest observable visual binaries. The brightest member, which is the third-brightest star in the constellation Cygnus, is actually a close binary itself. Also in the Cygnus constellation is Cygnus X-1, an X-ray source considered to be a black hole. It is a high-mass X-ray binary, with the optical counterpart being a variable star. Sirius is another binary and the brightest star in the night time sky, with a visual apparent magnitude of −1.46. It is located in the constellation Canis Major. In 1844 Friedrich Bessel deduced that Sirius was a binary. In 1862 Alvan Graham Clark discovered the companion (Sirius B; the visible star is Sirius A). In 1915 astronomers at the Mount Wilson Observatory determined that Sirius B was a white dwarf, the first to be discovered. In 2005, using the Hubble Systems with more than two stars are termed multiple stars. Algol is the most noted ternary (long thought to be a binary), located in the constellation Perseus. Two components of the system eclipse each other, the variation in the intensity of Algol first being recorded in 1670 by Geminiano Montanari. The name Algol means "demon star" (from "al-ghūl"), which was probably given due to its peculiar behavior. Another visible ternary is Alpha Centauri, in the southern constellation of Centaurus, which contains the fourth-brightest star in the night sky, with an apparent visual magnitude of −0.01. This system also underscores the fact that no search for habitable planets is complete if binaries are discounted. Alpha Centauri A and B have an 11 AU distance at closest approach, and both should have stable habitable zones. There are also examples of systems beyond ternaries: Castor is a sextuple star system, which is the second-brightest star in the constellation Gemini and one of the brightest stars in the nighttime sky. Astronomically, Castor was discovered to be a visual binary in 1719. Each of the components of Castor is itself a spectroscopic binary. Castor also has a faint and widely separated companion, which is also a spectroscopic binary. The Alcor–Mizar visual binary in Ursa Majoris also consists of six stars, four comprising Mizar and two comprising Alcor.
A binary star is a star system consisting of two stars orbiting around their common barycenter. Systems of two or more stars are called "multiple star systems". These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as multiple by other means.
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summarize: In the frontier town of Stetson City, Arizona, in 1885, business is booming at the Trigger Whisky Saloon. Tornado Lou, the local chanteuse, regales the saloon-goers with a sultry ballad ("Když v báru houstne dým"), while the saloon owner Doug Badman tries in vain to woo her. Two evangelists, Ezra Goodman and his daughter Winnifred, enter the bar attempting to drum up interest in their temperance movement, but the saloon's hard-drinking cowboys scorn them. Into the fracas steps a stranger: Lemonade Joe, a lone cowboy singing the praises of Kolaloka, a non-alcoholic soft drink (in Czech, "limonáda", hence the name). His superior gunfighting skill quickly convinces the saloon-goers of the benefits of teetotalism. Before long, Joe and the Goodmans have joined forces, Joe has begun courting Winnifred, and all the cowboys in Stetson City have transferred their loyalty to the cathedral-like God Bless Kolaloka Saloon ("Arizóna, to je pravých mužů zóna"). Doug Badman's business is saved by the arrival of his brother Horace, alias "Hogofogo, the Master Criminal of the Wild West". In a dramatic public appearance, Hogofogo convinces the Kolaloka customers to go back to Trigger Whisky, and soon the old saloon is back in business ("Whisky to je moje gusto"). Joe, unaware of the developments, is riding on the prairie ("Sou fár tů jů áj méj") until, thanks to a mirage, he discovers that Hogofogo has his own designs on Winnifred. Joe saves Winnifred from his clutches, but in the ensuing fight, his account book falls to the ground. Reading it, Winnifred discovers the truth: Joe is not the selfless hero he appears, but rather a traveling salesman for Kolalok & Son, makers of Kolaloka. Delighted at the news, Winnifred pledges her love for Joe. However, the chanteuse Tornado Lou has also fallen for Joe, imagining him as the ideal lover who will make her "different, better." Joe returns to Trigger Whisky Saloon, where, in another display of fighting skill, he wins the customers back to Kolaloka once again ("Můj bóže, můj bóže"). Hogofogo, in disguise, attempts to shoot Joe, but Joe instead engages him in a gunfighting chase through the town, trying to force him into signing a testimonial in favor of Kolaloka. Though Hogofogo seems momentarily to have the upper hand ("Horácova polka"), Tornado Lou attacks Hogofogo and saves Joe's life. Joe, too commercially oriented to understand her devotion, spurns her advances. In misery, she vows to help the Badmans lure Joe to his death. Their plan begins with Hogofogo, now disguised as a blind piano tuner ("Horácův pohřební blues"), kidnapping Winnifred as a bait to lure Joe to Dead Man's Valley ("Balada Mexico Kida"). There, the Badmans' henchmen, led by Grimpo, capture him and torture him, but Lou has a change of heart and saves his life again, reuniting him with Winnifred. Meanwhile, Hogofogo waits for his henchmen to deliver Winnifred to his room. Instead, Joe appears and forces him to sign the testimonial. Hogofogo, taking advantage of Joe's aversion to spirits, ambushes him with a volley of gunshot and leaves him dead. Hogofogo tracks Winnifred down to the Stetson City cemetery, where he attempts once again to kidnap her. When the now-moral Tornado Lou stops him, he kills her; in revenge, Doug Badman kills Hogofogo, and in his death throes, Hogofogo kills Doug. Just as he is about to shoot Winnifred, Lemonade Joe enters alive and well; surveying the three dead bodies, he notices their birthmarks and discovers that they are his long-lost siblings. He revives them with the same medicine that has just brought him back to life: the miraculous soft drink Kolaloka. Joe's father—none other than Mr. Kolalok himself, owner of Kolalok & Son—enters just in time for a happy ending, in which villains and heroes alike agree to work together and merge their businesses to create a new drink, Whiskola. The entire Kolalok family, including the newly married Winnifred and Joe, ride off into the sunset in a stagecoach as the population of Stetson City cheer. "Lemonade Joe" is, most prominently, a parody of clichés found in American Westerns. In addition, it includes a running satire of American capitalism and cultural imperialism—values embodied by the soft drink Kolaloka, the name of which is a clear parody of Coca-Cola. (In the earliest version of the Lemonade Joe stories, the drink was called Kolakoka, an even more unambiguous reference.) However, it is highly ambiguous whether the satire is intended as a serious critique of the capitalist system; indeed, values officially promoted in Eastern European countries of the time are implicitly satirized as well, with the plot culminating in a reconciliation and compromise between the two. The film's screenwriter, Jiří Brdečka, wrote that his main satiric target was the undertone of commercialism running through classic American westerns, explaining that the satire: Numerous scholars have commented on the film's multiple layers of thematic parody. The historian Peter Bischoff suggested that, while the film seems to parody the American capitalist system, it also functions as a thinly disguised critique of communism. The academician Anikó Imre noted that "by ridiculing the racist and sexist framework of the Western genre," "Lemonade Joe" also implicitly satirizes the rigid ideology of the Soviet government in the 1960s. The cultural anthropologist Cynthia Miller concludes that the film "both glorifies and mocks the wonders of capitalist enterprise, and in so doing, creates a meeting ground between Maysian [i.e. Karl May-like] celebration and contemporary Soviet denunciation of all things West." Stories about the American frontier, such as those by Karl May and Jack London, had long been widely read in Central Europe; May's influence in particular was crucial to the Eastern European imagination of the American West. American Western films had been popular in Czech theatres throughout the history of the First Republic of Czechoslovakia, from its founding in 1918 until the German occupation of Czechoslovakia in 1939. During the occupation and throughout Joseph Stalin's control of the Soviet Union, Westerns were banned. In the early 1960s, during Nikita Khrushchev's De-Stalinization of the Soviet Union, Westerns began to reappear in Czechoslovakia, with films such as "High Noon", "The Big Country", and "The Magnificent Seven" screened in theatres. Jiří Brdečka, a prolific Czech screenwriter and satirist, created the Lemonade Joe character in a 1940 serial, a parody of dime novels commissioned by the popular magazine "Ahoj na neděli". As the serial progressed, however, the target of the satire shifted from dime novels to Western epics; Brdečka was a self-professed fan of Westerns, citing "Stagecoach", "Wells Fargo" (1937), and "Frontier Marshal" (1939) as the films that sparked his interest in the genre. Brdečka also wrote a nonfiction work about the American frontier, "Kolty bez pozlátka" (1956), de-mythologizing the iconic Western figures of Wild Bill Hickock, Billy the Kid, and Jesse James. The Lemonade Joe stories were adapted as a stage play in 1946, which was a pronounced popular success. The stories also inspired the 1949 stop-motion animation short film "Song of the Prairie" (where the "Lemonade Joe" theme song, "Sou Fár Tu Jú Aj Mej", appeared for the first time) as well as two other animated films: Dušan Vukotić's "Cowboy Jimmie" (Yugoslavia, 1957) and Witold Giersz's "Maly Western" ("The Little Western," Poland, 1961). The Stetson City facades were built at the Czech film studios at Barrandov. Location shooting was done near Karlštejn Castle, in a rocky landscape that had been nicknamed "Amerika" since the nineteenth century for its similarity to the American West. An authentic Smith & Wesson gun, used as a prop by Joe, was borrowed from a local museum and restored especially for the film. In creating a filming style, director Oldrich Lipský was inspired by silent comedy films, from which he borrowed numerous effects, including film tinting, slow motion, and fast motion. Brdečka's experience as an animator, often in collaboration with Jiří Trnka, led to several effects and ideas derived from animation being incorporated into the film, including animated smoke rings and dotted lines for bullet paths, freeze frames for dramatic effect, and even a reference to the Acme Corporation from the "Looney Tunes" cartoons. The film includes specific parodic tributes to Western silent film actors such as William S. Hart and Tom Mix, as well as "singing cowboy" stars like Gene Autry, Tex Ritter, and Fred Scott. The film also evokes numerous other films, including Louis Feuillade's silent film serials, the 1911 Jack Conway Western "Arizona Bill", and the works of John Ford, including "My Darling Clementine". Tornado Lou's character suggests Marlene Dietrich's character in another classic Western film, "Destry Rides Again", and Hogofogo is likely modeled on John Carradine's character in "Stagecoach" (1939). The film's score matches the eclecticism of the story's sources, including honky-tonk piano pieces as well as traditional jazz and other genres. Joe's songs were dubbed by the "Golden Voice of Prague," Karel Gott, and the popular singer Waldemar Matuška was cast for a small role including a solo. "Lemonade Joe" was released in Czechoslovakia on 16 October 1964. In the same year, the film was widely released in other Soviet bloc countries (including Cuba, where it became the first Western shown on screen since the Cuban government's 1961 ban on Hollywood Westerns). In Czechoslovakia, it was the best-selling film of the 1960s. Czech critical reactions were mostly positive, although several critics, such as Otakar Váňa, felt that the second half was too slow-moving and too sharp in its political satire. Some reviews expressed disappointment that the film's parodic content would largely be lost on Czechoslovak audiences, since American Westerns were rarely screened. The film enjoys a near-iconic status in the Czech Republic as well as a considerable cult following, and Henry Fonda was reportedly among its foreign admirers. The film was selected as the Czechoslovakia entry for the Best Foreign Language Film at the 37th Academy Awards, but was not accepted as a nominee. In the mid-1980s, when Mikhail Gorbachev introduced measures to limit Soviet alcohol consumption, critics nicknamed him "Lemonade Joe" in a nod to the film.
Lemonade Joe, or the Horse Opera () is a 1964 Czechoslovak musical comedy film, directed by Oldřich Lipský and written by Jiří Brdečka, based on his novel and stage play.
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summarize: The film follows several couples over one night in Brno. The focus is on a 20-something couple with unspecified learning difficulties, Olinka (Kateřina Holánová) and Standa (Jan Budař), who are preparing to have sex for the first time. Standa has been receiving advice from his brother Jarda (Martin Pechlát), while Olinka has been given tips and guidance by her friends, the women who live in her apartment block. Standa and Jarda travel to Brno from Brundal for the occasion. Meanwhile, in a nearby pub, depressed actor Mirek (Miroslav Donutil) is with psychologist Vlasta (Pavla Tomicová), complaining about his life, and the two presently return to Vlasta's flat together where they have sex, and Vlasta counsels Mirek about the state of his marriage. In the same pub are Jaroslava (Ivana Uhlířová), a young woman who habitually attracts unpleasant men, and her current partner Richard (Marek Daniel), a pretentious and self-absorbed man who is tempted by sexual experimentation and submission. This couple return to Richard's flat in the same apartment block where Richard persuades an unwilling Jaroslava to spank him, alongside other requests. Also in the pub are life-long friends Honza (Pavel Liška) and Pavel (Filip Rajmont). While Honza rambles drunkenly about his desire for various women, Pavel has an undeclared love for Honza. At the house, Olinka is horrified to see her controlling mother return unexpectedly to the flat. Panicking, she administers rohypnol into her mother's coffee, and locks her unconscious in a storage cupboard. Standa arrives and they visit Olinka's friends so Standa can be vetted for their approval. Back down in Olinka's flat, Standa and Olinka share an awkward meal, and then proceed to the bedroom and are extremely nervous, but eventually Olinka manages to initiate sex. Despite Jarda's training, Standa is unable to put on the condom, so they do not use one. Meanwhile Jarda arrives at Olinka's friends' party upstairs to drink with them. Meanwhile, Mirek leaves Vlasta's house to go home, but on the way has a drunken argument with his wife on the phone, and ends up walking home to Líšeň in a drunken depression. Honza and Pavel also head home to Pavel's house, and Pavel is perturbed when Honza kisses his cheek while he sleeps. After having sex, Olinka excitedly tells her friends what happened, but at the same time her mother wakes up and sees Standa dancing in his underwear through the keyhole. When Olinka returns to the flat, the two women argue, and Standa flees the flat in panic. Pavel and Honza leave Pavel's place very early to deliver rohlík to Líšeň, but on the way Pavel takes his eyes off the road and hits Mirek, killing him. Comforting Pavel, Honza confides that his love is returned. Meanwhile, Olinka releases her mother from the pantry, but then locks her in again when Standa returns to her. A voice over confirms that Olinka is pregnant.
Boredom in Brno () is a Czech comedy film directed by Vladimír Morávek, based on the story "Standa's Debut" by Pavel Bedura. It was released in 2003, and won five Czech Lion awards, including Best Film, Best Director (Morávek), Best Script (Morávek and Jan Budař), Best Male Actor in a Leading Role (Budař) and Best Editing (Jiří Brožek).
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summarize: The word "galaxy" was borrowed via French and Medieval Latin from the Greek term for the Milky Way, "" ()'milky (circle)', named after its appearance as a milky band of light in the sky. In Greek mythology, Zeus places his son born by a mortal woman, the infant Heracles, on Hera's breast while she is asleep so the baby will drink her divine milk and thus become immortal. Hera wakes up while breastfeeding and then realizes she is nursing an unknown baby: she pushes the baby away, some of her milk spills, and it produces the faint band of light known as the Milky Way. In the astronomical literature, Tens of thousands of galaxies have been catalogued, but only a few have well-established names, such as the Andromeda Galaxy, the Magellanic Clouds, the Whirlpool Galaxy, and the Sombrero Galaxy. Astronomers work with numbers from certain catalogues, such as the Messier catalogue, the NGC (New General Catalogue), the IC (Index The realization that we live in a galaxy which is one among many galaxies, parallels major discoveries that were made about the Milky Way and other nebulae. The Greek philosopher Democritus (450–370 BCE) proposed that the bright band on the night sky known as the Milky Way might consist of distant stars. Aristotle (384–322 BCE), however, believed the Milky Way to be caused by "the ignition of the fiery exhalation of some stars that were large, numerous and close together" and that the "ignition takes place in the upper part of the atmosphere, in the region of the World that is continuous with the heavenly motions." The Neoplatonist philosopher Olympiodorus the Younger (–570 CE) was critical of this view, A few galaxies outside the Milky Way are visible on a dark night to the unaided eye, including the Andromeda Galaxy, Large Magellanic Cloud, the Small Magellanic Cloud, and the Triangulum Galaxy. In the 10th century, the Persian astronomer Al-Sufi made the earliest recorded identification of the Andromeda Galaxy, describing it as a "small cloud". In 964, Al-Sufi probably mentioned the Large Magellanic Cloud in his "Book of Fixed Stars" (referring to "Al Bakr of the southern Arabs", since at a declination of about 70° south it was not visible where he lived); it was not well known In 1944, Hendrik van de Hulst predicted that microwave radiation with wavelength of 21 cm would be detectable from interstellar atomic hydrogen gas; and in 1951 it was observed. This radiation is not affected by dust absorption, and so its Doppler shift can be used to map the motion of the gas in our galaxy. These observations led to the hypothesis of a rotating bar structure in the center of our galaxy. With improved radio telescopes, hydrogen gas could also be traced in other galaxies. In the 1970s, Vera Rubin uncovered a discrepancy between observed galactic rotation speed and that predicted by the visible mass of stars and gas. Today, the galaxy rotation problem is thought to be explained Galaxies come in three main types: ellipticals, spirals, and irregulars. A slightly more extensive description of galaxy types based on their appearance is given by the Hubble sequence. Since the Hubble sequence is entirely based upon visual morphological type (shape), it may miss certain important characteristics of galaxies such as star formation rate in starburst galaxies and activity in the cores of active galaxies. The Hubble classification system rates elliptical galaxies on the basis of their ellipticity, ranging from E0, being nearly spherical, up to E7, which is highly elongated. These galaxies have an ellipsoidal profile, giving them an elliptical appearance regardless of the viewing angle. Their appearance shows little structure and they typically have relatively little interstellar matter. Consequently, these galaxies also have a low portion of open clusters and a reduced rate of new star formation. Instead they are dominated by generally older, more evolved stars that are orbiting the common center of gravity in random directions. The stars contain low abundances of heavy elements because star formation ceases after the initial burst. In this sense they have some similarity to the much smaller globular clusters. The largest galaxies are giant ellipticals. Many elliptical galaxies are believed to form due to the interaction of galaxies, resulting in a collision and merger. They can grow to enormous sizes (compared to spiral galaxies, for example), and giant elliptical galaxies are often found near the core of large galaxy clusters. A shell galaxy is a type of elliptical galaxy where the stars in the galaxy's halo are arranged in concentric shells. About one-tenth of elliptical galaxies have a shell-like structure, which has never been observed in spiral galaxies. The shell-like structures are thought to develop when a larger galaxy absorbs a smaller companion galaxy. As the two galaxy centers approach, the centers start to oscillate around a center point, the oscillation creates gravitational ripples forming the shells of stars, similar to ripples spreading on water. For example, galaxy NGC 3923 has over twenty shells. Spiral galaxies resemble spiraling pinwheels. Though the stars and other visible material contained in such a galaxy lie mostly on a plane, the majority of mass in spiral galaxies exists in a roughly spherical halo of dark matter which extends beyond the visible component, as demonstrated by the universal rotation curve concept. Spiral galaxies consist of a rotating disk of stars and interstellar medium, along with a central bulge of generally older stars. Extending outward from the bulge are relatively bright arms. In the Hubble classification scheme, spiral galaxies are listed as type "S", followed by a letter ("a", "b", or "c") which indicates the degree of tightness of the spiral arms and the size of the central bulge. An "Sa" galaxy has tightly wound, poorly defined arms and possesses a relatively large core region. At the other extreme, an A majority of spiral galaxies, including our own Milky Way galaxy, have a linear, bar-shaped band of stars that extends outward to either side of the core, then merges into the spiral arm structure. In the Hubble classification scheme, these are designated by an "SB", followed by a lower-case letter ("a", "b" or "c") which indicates the form of the spiral arms (in the same manner as the categorization Recently, researchers described galaxies called super-luminous spirals. They are very large with an upward diameter of 437,000 light-years (compared to the Milky Way's 100,000 light-year diameter). With a mass of 340 billion solar masses, they generate a significant amount of ultraviolet and mid-infrared light. They are thought to have an increased star formation rate around 30 times faster than the Milky Way. Despite the prominence of large elliptical and spiral galaxies, most galaxies are dwarf galaxies. These galaxies are relatively small when compared with other galactic formations, being about one hundredth the size of the Milky Way, containing only a few billion stars. Ultra-compact dwarf galaxies have recently been discovered that are only 100 parsecs across. Many dwarf galaxies may orbit a single larger galaxy; the Milky Way has at least a dozen Interactions between galaxies are relatively frequent, and they can play an important role in galactic evolution. Near misses between galaxies result in warping distortions due to tidal interactions, and may cause some exchange of gas and dust. Collisions occur when two galaxies pass directly through each other and have sufficient relative momentum not to merge. The stars of interacting galaxies will usually not collide, but the gas and dust within the two forms will interact, sometimes triggering star formation. A collision can severely distort the Stars are created within galaxies from a reserve of cold gas that forms into giant molecular clouds. Some galaxies have been observed to form stars at an exceptional rate, which is known as a starburst. If they continue to do so, then they would consume their reserve of gas in a time span less than the lifespan of the galaxy. Hence starburst activity usually lasts only about ten million years, a relatively brief period in the history of a galaxy. Starburst galaxies were more common during the early A portion of the observable galaxies are classified as active galaxies if the galaxy contains an active galactic nucleus (AGN). A significant portion of the total energy output from the galaxy is emitted by the active galactic nucleus, instead of the stars, dust and interstellar medium of the galaxy. The standard model for an active galactic nucleus is based upon an accretion disc that forms around a supermassive black hole (SMBH) at the core region of the galaxy. The radiation from an active galactic nucleus results from the gravitational energy of matter as it falls toward the black hole from the disc. In about 10% of these galaxies, a diametrically opposed pair of energetic jets ejects particles from the galaxy core at velocities close to the speed of light. The mechanism for producing these jets is not well understood. Blazars are believed to be an active galaxy with a relativistic jet that is pointed in the direction of Earth. Possibly related to active galactic nuclei (as well as starburst regions) are low-ionization nuclear emission-line regions (LINERs). The emission from LINER-type Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars. They have quasar-like nuclei (very luminous, distant and bright sources of electromagnetic radiation) with very high surface brightnesses but unlike Quasars (/ˈkweɪzɑr/) or quasi-stellar radio sources are the most energetic and distant members of active galactic nuclei. Quasars are extremely luminous and were first identified as being high redshift sources of electromagnetic energy, including radio waves and visible light, that appeared to be similar to stars rather than extended sources similar to galaxies. Their luminosity can be 100 times that of the Milky Way. Luminous infrared galaxies or LIRGs are galaxies with luminosities, the measurement of brightness, above 10 L☉. LIRGs are more abundant than starburst Galaxies have magnetic fields of their own. They are strong enough to be dynamically important: they drive mass inflow into the centers of galaxies, they modify the formation of spiral arms and they can affect the rotation of gas in the outer regions of galaxies. Magnetic fields provide the transport of angular momentum required for the collapse of gas clouds and hence the formation of new stars. The typical average equipartition strength for spiral galaxies is about 10 μG Galactic formation and evolution is an active area of research in astrophysics. Current cosmological models of the early universe are based on the Big Bang theory. About 300,000 years after this event, atoms of hydrogen and helium began to form, in an event called recombination. Nearly all the hydrogen was neutral (non-ionized) and readily absorbed light, and no stars had yet formed. As a result, this period has been called the "dark ages". It was from density fluctuations (or anisotropic irregularities) in this primordial matter that larger structures began to appear. As a result, masses of baryonic matter started to condense within cold dark matter halos. These primordial structures would eventually become the galaxies we see today. Evidence for the early appearance of galaxies was found in 2006, when it was discovered that the galaxy IOK-1 has an unusually high redshift of 6.96, corresponding to just 750 million years after the Big Bang and making it the most distant and primordial galaxy yet seen. While some scientists have claimed other objects (such as Abell 1835 IR1916) have higher redshifts (and therefore are seen in an earlier stage of the universe's evolution), IOK-1's age and composition have been more The detailed process by which early galaxies formed is an open question in astrophysics. Theories can be divided into two categories: top-down and bottom-up. In top-down correlations (such as the Eggen–Lynden-Bell–Sandage [ELS] model), protogalaxies form in a large-scale simultaneous collapse lasting about one hundred million years. In bottom-up theories (such as the Searle-Zinn [SZ] model), small structures such as globular clusters form first, and then a number of such bodies accrete to form a larger galaxy. Once protogalaxies began to form and contract, the first Within a billion years of a galaxy's formation, key structures begin to appear. Globular clusters, the central supermassive black hole, and a galactic bulge of metal-poor Population II stars form. The creation of a supermassive black hole appears to play a key role in actively regulating the growth of galaxies by limiting the total amount of additional matter added. During this early epoch, galaxies undergo a major burst of star formation. During the following two billion years, the accumulated matter settles into a galactic disc. A galaxy will continue to absorb infalling material from high-velocity clouds and dwarf galaxies throughout its life. This matter is mostly hydrogen and helium. The cycle of stellar birth and death slowly increases the abundance of heavy elements, eventually allowing the formation of planets. The Spiral galaxies, like the Milky Way, produce new generations of stars as long as they have dense molecular clouds of interstellar hydrogen in their spiral arms. Elliptical galaxies are largely devoid of this gas, and so form few new stars. The supply of star-forming material is finite; once stars have converted the available supply of hydrogen into heavier elements, new star formation will come to an end. The current Deep sky surveys show that galaxies are often found in groups and clusters. Solitary galaxies that have not significantly interacted with another galaxy of comparable mass during the past billion years are relatively scarce. Only about five percent of the galaxies surveyed have been found to be truly isolated; however, these isolated formations may have interacted and even merged with other galaxies in the past, and may still be orbited by smaller, satellite galaxies. Isolated galaxies can produce stars at a higher rate than normal, as their gas is not being stripped by other nearby galaxies. On the largest scale, the universe is continually expanding, resulting in an average increase in the separation between individual galaxies (see Hubble's law). Associations of galaxies can overcome this expansion on a local scale through their mutual gravitational attraction. These associations formed early, as clumps of dark matter pulled their respective galaxies together. Nearby groups later merged to form larger-scale clusters. This on-going merger process (as well as an influx of infalling gas) heats the inter-galactic gas within a cluster to very high temperatures, reaching 30–100 megakelvins. About 70–80% of the mass in a cluster is in the form of dark matter, with 10–30% consisting of this heated gas and the remaining few percent of the matter in the form of galaxies. Most galaxies are gravitationally bound to a The peak radiation of most stars lies in the visible spectrum, so the observation of the stars that form galaxies has been a major component of optical astronomy. It is also a favorable portion of the spectrum for observing ionized H II regions, and for examining the distribution of dusty arms. The dust present in the interstellar medium is opaque to visual light. It is more transparent to far-infrared, which can be used to observe the interior regions of giant molecular clouds and galactic cores in great detail. Infrared is also used to observe distant, red-shifted galaxies that were formed much earlier. Water vapor and carbon dioxide absorb a number of useful portions of the infrared spectrum, so high-altitude or space-based telescopes are used for infrared astronomy. The first non-visual study of galaxies, particularly active galaxies, was made using radio frequencies. The Earth's atmosphere is nearly transparent to radio between 5 MHz and 30 GHz. (The ionosphere blocks signals below this range.) Large radio interferometers have been used to map the active jets emitted from active nuclei. Radio telescopes can also be used to observe neutral hydrogen (via 21 cm radiation), including, potentially, the non-ionized matter in the early universe that later collapsed to form galaxies. Ultraviolet and X-ray telescopes can observe highly energetic galactic phenomena. Ultraviolet flares are sometimes observed when a star in a distant galaxy is torn apart from the tidal forces of a nearby black hole. The distribution of hot gas in galactic clusters can be mapped by X-rays. The existence of supermassive black holes at the cores of galaxies was confirmed through X-ray astronomy.
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek "" (), literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few hundred million () stars to giants with one hundred trillion () stars, each orbiting its galaxy's center of mass.
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summarize: A traditional division of observational astronomy is based on the region of the electromagnetic spectrum observed: In addition to using electromagnetic radiation, modern astrophysicists can also make observations using neutrinos, cosmic rays or gravitational waves. Observing a source using multiple methods is known as multi-messenger astronomy. Optical and radio astronomy can be performed with ground-based observatories, because the atmosphere is relatively transparent at the wavelengths being detected. Observatories are usually located at high altitudes so as to minimise the absorption and distortion caused by the Earth's atmosphere. Some wavelengths of infrared light are heavily absorbed by water vapor, so many infrared observatories are located in dry places at high altitude, or in space. The atmosphere is opaque at the wavelengths used by X-ray astronomy, gamma-ray astronomy, UV astronomy and (except for a few wavelength "windows") far infrared astronomy, so observations must be carried out mostly from balloons or space observatories. Powerful gamma rays can, however be detected by the large air showers they produce, and the study of cosmic rays is a rapidly expanding branch of astronomy. For much of the history of observational astronomy, almost all observation was performed in the visual spectrum with optical telescopes. While the Earth's atmosphere is relatively transparent in this portion of the electromagnetic spectrum, most telescope work is still dependent on seeing conditions and air transparency, and is generally restricted to the night time. The seeing conditions depend on the turbulence and thermal variations in the air. Locations that are frequently cloudy or suffer from atmospheric turbulence limit the resolution of observations. Likewise the presence of the full Moon can brighten up the sky with scattered light, hindering observation of faint objects. For observation purposes, the optimal location for an optical telescope is undoubtedly in outer space. There the telescope can make observations without being affected by the atmosphere. However, at present it remains costly to lift telescopes into orbit. Thus the next best locations are certain mountain peaks that have a high number of cloudless days and generally possess good atmospheric conditions (with good seeing conditions). The peaks of the islands of Mauna Kea, Hawaii and La Palma possess these properties, as to a lesser extent do inland sites such as Llano de Chajnantor, Paranal, Cerro Tololo and La Silla in Chile. These observatory locations have attracted an assemblage of powerful telescopes, totalling many billion US dollars of investment. The darkness of the night sky is an important factor in optical astronomy. With the size of cities and human populated areas ever expanding, the amount of artificial light at night has also increased. These artificial lights produce a diffuse background illumination that makes observation of faint astronomical features very difficult without special filters. In a few locations such as the state of Arizona and in the United Kingdom, this has led to campaigns for the reduction of light pollution. The use of hoods around street lights not only improves the amount of light directed toward the ground, but also helps reduce the light directed toward the sky. Atmospheric effects (astronomical seeing) can severely hinder the resolution of a telescope. Without some means of correcting for the blurring effect of the shifting atmosphere, telescopes larger than about 15–20 cm in aperture can not achieve their theoretical resolution at visible wavelengths. As a result, the primary benefit of using very large telescopes has been the improved light-gathering capability, allowing very faint magnitudes to be observed. However the resolution handicap has begun to be overcome by adaptive optics, speckle imaging and interferometric imaging, as well as the use of space telescopes. Astronomers have a number of observational tools that they can use to make measurements of the heavens. For objects that are relatively close to the Sun and Earth, direct and very precise position measurements can be made against a more distant (and thereby nearly stationary) background. Early observations of this nature were used to develop very precise orbital models of the various planets, and to determine their respective masses and gravitational perturbations. Such measurements led to the discovery of the planets Uranus, Neptune, and (indirectly) Pluto. They also resulted in an erroneous assumption of a fictional planet Vulcan within the orbit of Mercury (but the explanation of the precession of Mercury's orbit by Einstein is considered one of the triumphs of his general relativity theory). In addition to examination of the universe in the optical spectrum, astronomers have increasingly been able to acquire information in other portions of the electromagnetic spectrum. The earliest such non-optical measurements were made of the thermal properties of the Sun. Instruments employed during a solar eclipse could be used to measure the radiation from the corona. With the discovery of radio waves, radio astronomy began to emerge as a new discipline in astronomy. The long wavelengths of radio waves required much larger collecting dishes in order to make images with good resolution, and later led to the development of the multi-dish interferometer for making high-resolution aperture synthesis radio images (or "radio maps"). The development of the microwave horn receiver led to the discovery of the microwave background radiation associated with the Big Bang. Radio astronomy has continued to expand its capabilities, even using radio astronomy satellites to produce interferometers with baselines much larger than the size of the Earth. However, the ever-expanding use of the radio spectrum for other uses is gradually drowning out the faint radio signals from the stars. For this reason, in the future radio astronomy might be performed from shielded locations, such as the far side of the Moon. The last part of the twentieth century saw rapid technological advances in astronomical instrumentation. Optical telescopes were growing ever larger, and employing adaptive optics to partly negate atmospheric blurring. New telescopes were launched into space, and began observing the universe in the infrared, ultraviolet, x-ray, and gamma ray parts of the electromagnetic spectrum, as well as observing cosmic rays. Interferometer arrays produced the first extremely high-resolution images using aperture synthesis at radio, infrared and optical wavelengths. Orbiting instruments such as the Hubble Space Telescope produced rapid advances in astronomical knowledge, acting as the workhorse for visible-light observations of faint objects. New space instruments under development are expected to directly observe planets around other stars, perhaps even some Earth-like worlds. In addition to telescopes, astronomers have begun using other instruments to make observations. Neutrino astronomy is the branch of astronomy that observes astronomical objects with neutrino detectors in special observatories, usually huge underground tanks. Nuclear reactions in stars and supernova explosions produce very large numbers of neutrinos, a very few of which may be detected by a neutrino telescope. Neutrino astronomy is motivated by the possibility of observing processes that are inaccessible to optical telescopes, such as the Sun's core. Gravitational wave detectors are being designed that may capture events such as collisions of massive objects such as neutron stars or black holes. Robotic spacecraft are also being increasingly used to make highly detailed observations of planets within the Solar System, so that the field of planetary science now has significant cross-over with the disciplines of geology and meteorology. The key instrument of nearly all modern observational astronomy is the telescope. This serves the dual purposes of gathering more light so that very faint objects can be observed, and magnifying the image so that small and distant objects can be observed. Optical astronomy requires telescopes that use optical components of great precision. Typical requirements for grinding and polishing a curved mirror, for example, require the surface to be within a fraction of a wavelength of light of a particular conic shape. Many modern "telescopes" actually consist of arrays of telescopes working together to provide higher resolution through aperture synthesis. Large telescopes are housed in domes, both to protect them from the weather and to stabilize the environmental conditions. For example, if the temperature is different from one side of the telescope to the other, the shape of the structure changes, due to thermal expansion pushing optical elements out of position. This can affect the image. For this reason, the domes are usually bright white (titanium dioxide) or unpainted metal. Domes are often opened around sunset, long before observing can begin, so that air can circulate and bring the entire telescope to the same temperature as the surroundings. To prevent wind-buffet or other vibrations affecting observations, it is standard practice to mount the telescope on a concrete pier whose foundations are entirely separate from those of the surrounding dome and building. To do almost any scientific work requires that telescopes track objects as they wheel across the visible sky. In other words, they must smoothly compensate for the rotation of the Earth. Until the advent of computer controlled drive mechanisms, the standard solution was some form of equatorial mount, and for small telescopes this is still the norm. However, this is a structurally poor design and becomes more and more cumbersome as the diameter and weight of the telescope increases. The world's largest equatorial mounted telescope is the 200 inch (5.1 m) Hale Telescope, whereas recent 8–10 m telescopes use the structurally better altazimuth mount, and are actually physically "smaller" than the Hale, despite the larger mirrors. As of 2006, there are design projects underway for gigantic alt-az telescopes: the Thirty Metre Telescope, and the 100 m diameter Overwhelmingly Large Telescope. Amateur astronomers use such instruments as the Newtonian reflector, the Refractor and the increasingly popular Maksutov telescope. The photograph has served a critical role in observational astronomy for over a century, but in the last 30 years it has been largely replaced for imaging applications by digital sensors such as CCDs and CMOS chips. Specialist areas of astronomy such as photometry and interferometry have utilised electronic detectors for a much longer period of time. Astrophotography uses specialised photographic film (or usually a glass plate coated with photographic emulsion), but there are a number of drawbacks, particularly a low quantum efficiency, of the order of 3%, whereas CCDs can be tuned for a QE >90% in a narrow band. Almost all modern telescope instruments are electronic arrays, and older telescopes have been either been retrofitted with these instruments or closed down. Glass plates are still used in some applications, such as surveying, because the resolution possible with a chemical film is much higher than any electronic detector yet constructed. Prior to the invention of photography, all astronomy was done with the naked eye. However, even before films became sensitive enough, scientific astronomy moved entirely to film, because of the overwhelming advantages: The blink comparator is an instrument that is used to compare two nearly identical photographs made of the same section of sky at different points in time. The comparator alternates illumination of the two plates, and any changes are revealed by blinking points or streaks. This instrument has been used to find asteroids, comets, and variable stars. The position or cross-wire micrometer is an implement that has been used to measure double stars. This consists of a pair of fine, movable lines that can be moved together or apart. The telescope lens is lined up on the pair and oriented using position wires that lie at right angles to the star separation. The movable wires are then adjusted to match the two star positions. The separation of the stars is then read off the instrument, and their true separation determined based on the magnification of the instrument. A vital instrument of observational astronomy is the spectrograph. The absorption of specific wavelengths of light by elements allows specific properties of distant bodies to be observed. This capability has resulted in the discovery of the element of helium in the Sun's emission spectrum, and has allowed astronomers to determine a great deal of information concerning distant stars, galaxies, and other celestial bodies. Doppler shift (particularly "redshift") of spectra can also be used to determine the radial motion or distance with respect to the Earth. Early spectrographs employed banks of prisms that split light into a broad spectrum. Later the grating spectrograph was developed, which reduced the amount of light loss compared to prisms and provided higher spectral resolution. The spectrum can be photographed in a long exposure, allowing the spectrum of faint objects (such as distant galaxies) to be measured. Stellar photometry came into use in 1861 as a means of measuring stellar colors. This technique measured the magnitude of a star at specific frequency ranges, allowing a determination of the overall color, and therefore temperature of a star. By 1951 an internationally standardized system of UBV-magnitudes ("U"ltraviolet-"B"lue-"V"isual) was adopted. Photoelectric photometry using the CCD is now frequently used to make observations through a telescope. These sensitive instruments can record the image nearly down to the level of individual photons, and can be designed to view in parts of the spectrum that are invisible to the eye. The ability to record the arrival of small numbers of photons over a period of time can allow a degree of computer correction for atmospheric effects, sharpening up the image. Multiple digital images can also be combined to further enhance the image. When combined with the adaptive optics technology, image quality can approach the theoretical resolution capability of the telescope. Filters are used to view an object at particular frequencies or frequency ranges. Multilayer film filters can provide very precise control of the frequencies transmitted and blocked, so that, for example, objects can be viewed at a particular frequency emitted only by excited hydrogen atoms. Filters can also be used to partially compensate for the effects of light pollution by blocking out unwanted light. Polarization filters can also be used to determine if a source is emitting polarized light, and the orientation of the polarization. Astronomers observe a wide range of astronomical sources, including high-redshift galaxies, AGNs, the afterglow from the Big Bang and many different types of stars and protostars. A variety of data can be observed for each object. The position coordinates locate the object on the sky using the techniques of spherical astronomy, and the magnitude determines its brightness as seen from the Earth. The relative brightness in different parts of the spectrum yields information about the temperature and physics of the object. Photographs of the spectra allow the chemistry of the object to be examined. Parallax shifts of a star against the background can be used to determine the distance, out to a limit imposed by the resolution of the instrument. The radial velocity of the star and changes in its position over time (proper motion) can be used to measure its velocity relative to the Sun. Variations in the brightness of the star give evidence of instabilities in the star's atmosphere, or else the presence of an occulting companion. The orbits of binary stars can be used to measure the relative masses of each companion, or the total mass of the system. Spectroscopic binaries can be found by observing doppler shifts in the spectrum of the star and its close companion. Stars of identical masses that formed at the same time and under similar conditions typically have nearly identical observed properties. Observing a mass of closely associated stars, such as in a globular cluster, allows data to be assembled about the distribution of stellar types. These tables can then be used to infer the age of the association. For distant galaxies and AGNs observations are made of the overall shape and properties of the galaxy, as well as the groupings where they are found. Observations of certain types of variable stars and supernovae of known luminosity, called standard candles, in other galaxies allows the inference of the distance to the host galaxy. The expansion of space causes the spectra of these galaxies to be shifted, depending on the distance, and modified by the Doppler effect of the galaxy's radial velocity. Both the size of the galaxy and its redshift can be used to infer something about the distance of the galaxy. Observations of large numbers of galaxies are referred to as redshift surveys, and are used to model the evolution of galaxy forms.
Observational astronomy is a division of astronomy that is concerned with recording data about the observable universe, in contrast with theoretical astronomy, which is mainly concerned with calculating the measurable implications of physical models. It is the practice and study of observing celestial objects with the use of telescopes and other astronomical instruments.
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summarize: Right ascension is the celestial equivalent of terrestrial longitude. Both right ascension and longitude measure an angle from a primary direction (a zero point) on an equator. Right ascension is measured from the Sun at the March equinox i.e. the First Point of Aries, which is the place on the celestial sphere where the Sun crosses the celestial equator from south to north at the March equinox and is currently located in the constellation Pisces. Right ascension is measured continuously in a full circle from that alignment of Earth and Sun in space, that equinox, the measurement increasing towards the east. As seen from Earth (except at the poles), objects noted to have 12 are longest visible (appear throughout the night) at the March equinox; those with 0 (apart from the sun) do so at the September equinox. On those dates at midnight, such objects will reach ("culminate" at) their highest point (their meridian). How high depends on their declination; if 0° declination (i.e. on the celestial equator) then at Earth's equator they are directly overhead (at zenith). Any units of angular measure could have been chosen for right ascension, but it is customarily measured in hours (), minutes (), and seconds (), with 24 being equivalent to a full circle. Astronomers have chosen this unit to measure right ascension because they measure a star's location by timing its passage through the highest point in the sky as the Earth rotates. The line which passes through the highest point in the sky, called the meridian, is the projection of a longitude line onto the celestial sphere. Since a complete circle contains 24 of right ascension or 360° (degrees of arc), of a circle is measured as 1 of right ascension, or 15°; of a circle is measured as 1 of right ascension, or 15 minutes of arc (also written as 15′); and of a circle contains 1 of right ascension, or 15 seconds of arc (also written as 15′′). A full circle, measured in right-ascension units, contains, or, or 24. Because right ascensions are measured in hours (of rotation of the Earth), they can be used to time the positions of objects in the sky. For example, if a star with RA = is at its meridian, then a star with RA = will be on the/at its meridian (at its apparent highest point) 18.5 sidereal hours later. Sidereal hour angle, used in celestial navigation, is similar to right ascension, but increases westward rather than eastward. Usually measured in degrees (°), it is the complement of right ascension with respect to 24. It is important not to confuse sidereal hour angle with the astronomical concept of hour angle, which measures angular distance of an object westward from the local meridian. The Earth's axis rotates around a small circle (relative to its equator) slowly westward about the poles of the ecliptic, completing one cycle in about 26,000 years. This movement, known as precession, causes the coordinates of stationary celestial objects to change continuously, if rather slowly. Therefore, equatorial coordinates (including right ascension) are inherently relative to the year of their observation, and astronomers specify them with reference to a particular year, known as an epoch. Coordinates from different epochs must be mathematically rotated to match each other, or to match a standard epoch. Right ascension for "fixed stars" near the ecliptic and equator increases by about 3.05 seconds per year on average, or 5.1 minutes per century, but for fixed stars further from the ecliptic the rate of change can be anything from negative infinity to positive infinity. The right ascension of Polaris is increasing quickly. The North Ecliptic Pole in Draco and the South Ecliptic Pole in Dorado are always at right ascension 18 and 6 respectively. The currently used standard epoch is J2000.0, which is January 1, 2000 at 12:00 TT. The prefix "J" indicates that it is a Julian epoch. Prior to J2000.0, astronomers used the successive Besselian epochs B1875.0, B1900.0, and B1950.0. The concept of right ascension has been known at least as far back as Hipparchus who measured stars in equatorial coordinates in the 2nd century BC. But Hipparchus and his successors made their star catalogs in ecliptic coordinates, and the use of RA was limited to special cases. With the invention of the telescope, it became possible for astronomers to observe celestial objects in greater detail, provided that the telescope could be kept pointed at the object for a period of time. The easiest way to do that is to use an equatorial mount, which allows the telescope to be aligned with one of its two pivots parallel to the Earth's axis. A motorized clock drive often is used with an equatorial mount to cancel out the Earth's rotation. As the equatorial mount became widely adopted for observation, the equatorial coordinate system, which includes right ascension, was adopted at the same time for simplicity. Equatorial mounts could then be accurately pointed at objects with known right ascension and declination by the use of setting circles. The first star catalog to use right ascension and declination was John Flamsteed's "Historia Coelestis Britannica" (1712, 1725).
Right ascension (abbreviated RA; symbol ) is the angular distance of a particular point measured eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point in question above the earth. When paired with declination, these astronomical coordinates specify the location of a point on the celestial sphere in the equatorial coordinate system.
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68
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summarize: Declination in astronomy is comparable to geographic latitude, projected onto the celestial sphere, and hour angle is likewise comparable to longitude. Points north of the celestial equator have positive declinations, while those south have negative declinations. Any units of angular measure can be used for declination, but it is customarily measured in the degrees (°), minutes (′), and seconds (′′) of sexagesimal measure, with 90° equivalent to a quarter circle. Declinations with magnitudes greater than 90° do not occur, because the poles are the northernmost and southernmost points of the celestial sphere. An object at the The sign is customarily included whether positive or negative. The Earth's axis rotates slowly westward about the poles of the ecliptic, completing one circuit in about 26,000 years. This effect, known as precession, causes the coordinates of stationary celestial objects to change continuously, if rather slowly. Therefore, equatorial coordinates (including declination) are inherently relative to the year of their observation, and astronomers specify them with reference to a particular year, known as an epoch. Coordinates from different epochs must be mathematically rotated to match each other, or to match a standard epoch. The currently used standard epoch is J2000.0, which is January 1, 2000 at 12:00 TT. The prefix "J" indicates that it is a Julian epoch. Prior to J2000.0, astronomers used the successive Besselian Epochs B1875.0, B1900.0, and B1950.0. A star's direction remains nearly fixed due to its vast distance, but its right ascension and declination do change gradually due to precession of the equinoxes and proper motion, and cyclically due to annual parallax. The declinations of Solar System objects change very rapidly compared to those of stars, due to orbital motion and close proximity. As seen from locations in the Earth's Northern Hemisphere, celestial objects with declinations greater than 90° − (where = observer's latitude) appear to circle daily around the celestial pole without dipping below the horizon, and are therefore called circumpolar stars. This similarly occurs in the Southern Hemisphere for objects with declinations less (i.e. more negative) than −90° − (where is always a negative number for southern latitudes). An extreme example is the pole star which has a declination near to +90°, so is circumpolar as seen from anywhere in the Northern Hemisphere except very close to the equator. Circumpolar stars never dip below the horizon. Conversely, there are other stars that never rise above the horizon, as seen from any given point on the Earth's surface (except extremely close to the equator. Upon flat terrain, the distance has to be within approximately 2 km, although this varies based upon the observer's altitude and surrounding terrain). Generally, if a star whose declination is is circumpolar for some observer (where is either positive or negative), then a star whose declination is − never rises above the horizon, as seen by the same observer. (This neglects the effect of atmospheric refraction.) Likewise, if a star is circumpolar for an observer at latitude, then it never rises above the horizon as seen by an observer at latitude −. Neglecting atmospheric refraction, for an observer in the equator, declination is always 0° at east and west points of the horizon. At the north point, it is 90° − ||, and at the south point, −90° + ||. From the poles, declination is uniform around the entire horizon, approximately 0°. Non-circumpolar stars are visible only during certain days or seasons of the year. The Sun's declination varies with the seasons. As seen from arctic or antarctic latitudes, the Sun is circumpolar near the local summer solstice, leading to the phenomenon of it being above the horizon at midnight, which is called midnight sun. Likewise, near the local winter solstice, the Sun remains below the horizon all day, which is called polar night. When an object is directly overhead its declination is almost always within 0.01 degrees of the observer's latitude; it would be exactly equal except for two complications. The first complication applies to all celestial objects: the object's declination equals the observer's astronomical latitude, but the term "latitude" ordinarily means geodetic latitude, which is the latitude on maps and GPS devices. In the continental United States and surrounding area, the difference (the vertical deflection) is typically a few arcseconds (1 arcsecond = of a degree) but can be as great as 41 arcseconds. The second complication is that, assuming no deflection of the vertical, "overhead" means perpendicular to the ellipsoid at observer's location, but the perpendicular line does not pass through the center of the earth; almanacs provide declinations measured at the center of the Earth. (An ellipsoid is an approximation to sea level that is mathematically manageable).
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. Declination's angle is measured north or south of the celestial equator, along the hour circle passing through the point in question.
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summarize: A red giant is a star that has exhausted the supply of hydrogen in its core and has begun thermonuclear fusion of hydrogen in a shell surrounding the core. They have radii tens to hundreds of times larger than that of the Sun. However, their outer envelope is lower in temperature, giving them a reddish-orange hue. Despite the lower energy density of their envelope, red giants are many times more luminous than the Sun because of their great size. Red-giant-branch stars have luminosities up to nearly three thousand times that of the Sun (), spectral types of K or M, have surface temperatures of 3,000–4,000 K, and radii up to about 200 times the Sun (). Stars on the horizontal branch are hotter, with only a small range of luminosities around. Asymptotic-giant-branch stars range from similar luminosities as the brighter stars of the red-giant branch, up to several times more luminous at the end of the thermal pulsing phase. Among the asymptotic-giant-branch stars belong the carbon stars of type C-N and late C-R, produced when carbon and other elements are convected to the surface in what is called a dredge-up. The first dredge-up occurs during hydrogen shell burning on the red-giant branch, but does not produce a large carbon abundance at the surface. The second, and sometimes third, dredge up occurs during helium shell burning on the asymptotic-giant branch and convects carbon to the surface in sufficiently massive stars. The stellar limb of a red giant is not sharply defined, contrary to their depiction in many illustrations. Rather, due to the very low mass density of the envelope, such stars lack a well-defined photosphere, and the body of the star gradually transitions into a 'corona'. The coolest red giants have complex spectra, with molecular lines, emission features, and sometimes masers, particularly from thermally pulsing AGB stars. Another noteworthy feature of red giants is that, unlike Sun-like stars whose photospheres have a large number of small convection cells (solar granules), red-giant photospheres, as well as those of red supergiants, have just a few large cells, the features of which cause the variations of brightness so common on both types of stars. Red giants are evolved from main-sequence stars with masses in the range from about to around. When a star initially forms from a collapsing molecular cloud in the interstellar medium, it contains primarily hydrogen and helium, with trace amounts of "metals" (in stellar structure, this simply refers to "any" element that is not hydrogen or helium i.e. atomic number greater than 2). These elements are all uniformly mixed throughout the star. The star reaches the main sequence when the core reaches a temperature high enough to begin fusing hydrogen (a few million kelvin) and establishes hydrostatic equilibrium. Over its main sequence life, the star slowly converts the hydrogen in the core into helium; its main-sequence life ends when nearly all the hydrogen in the core has been fused. For the Sun, the main-sequence lifetime is approximately 10 billion years. More-massive stars burn disproportionately faster and so have a shorter lifetime than less massive stars. When the star exhausts the hydrogen fuel in its core, nuclear reactions can no longer continue and so the core begins to contract due to its own gravity. This brings additional hydrogen into a zone where the temperature and pressure are sufficient to cause fusion to resume in a shell around the core. The hydrogen-burning shell results in a situation that has been described as the "mirror principle"; when the core within the shell contracts, the layers of the star outside the shell must expand. The detailed physical processes that cause this are complex, but the behaviour is necessary to satisfy simultaneous conservation of gravitational and thermal energy in a star with the shell structure. The core contracts and heats up due to the lack of fusion, and so the outer layers of the star expand greatly, absorbing most of the extra energy from shell fusion. This process of cooling and expanding is the subgiant star. When the envelope of the star cools sufficiently it becomes convective, the star stops expanding, its luminosity starts to increase, and the star is ascending the red-giant branch of the Hertzsprung–Russell (H–R) diagram. The evolutionary path the star takes as it moves along the red-giant branch depends on the mass of the star. For the Sun and stars of less than about the core will become dense enough that electron degeneracy pressure will prevent it from collapsing further. Once the core is degenerate, it will continue to heat until it reaches a temperature of roughly 10 K, hot enough to begin fusing helium to carbon via the triple-alpha process. Once the degenerate core reaches this temperature, the entire core will begin helium fusion nearly simultaneously in a so-called helium flash. In more-massive stars, the collapsing core will reach 10 K before it is dense enough to be degenerate, so helium fusion will begin much more smoothly, and produce no helium flash. The core helium fusing phase of a star's life is called the horizontal branch in metal-poor stars, so named because these stars lie on a nearly horizontal line in the H–R diagram of many star clusters. Metal-rich helium-fusing stars instead lie on the so-called red clump in the H–R diagram. An analogous process occurs when the central helium is exhausted and the star collapses once again, causing helium in a shell to begin fusing. At the same time hydrogen may begin fusion in a shell just outside the burning helium shell. This puts the star onto the asymptotic giant branch, a second red-giant phase. The helium fusion results in the build up of a carbon–oxygen core. A star below about will never start fusion in its degenerate carbon–oxygen core. Instead, at the end of the asymptotic-giant-branch phase the star will eject its outer layers, forming a planetary nebula with the core of the star exposed, ultimately becoming a white dwarf. The ejection of the outer mass and the creation of a planetary nebula finally ends the red-giant phase of the star's evolution. The red-giant phase typically lasts only around a billion years in total for a solar mass star, almost all of which is spent on the red-giant branch. The horizontal-branch and asymptotic-giant-branch phases proceed tens of times faster. If the star has about 0.2 to, it is massive enough to become a red giant but does not have enough mass to initiate the fusion of helium. These "intermediate" stars cool somewhat and increase their luminosity but never achieve the tip of the red-giant branch and helium core flash. When the ascent of the red-giant branch ends they puff off their outer layers much like a post-asymptotic-giant-branch star and then become a white dwarf. Very-low-mass stars are fully convective and may continue to fuse hydrogen into helium for up to a trillion years until only a small fraction of the entire star is hydrogen. Luminosity and temperature steadily increase during this time, just as for more-massive main-sequence stars, but the length of time involved means that the temperature eventually increases by about 50% and the luminosity by around 10 times. Eventually the level of helium increases to the point where the star ceases to be fully convective and the remaining hydrogen locked in the core is consumed in only a few billion more years. Depending on mass, the temperature and luminosity continue to increase for a time during hydrogen shell burning, the star can become hotter than the Sun and tens of times more luminous than when it formed although still not as luminous as the Sun. After some billions more years, they start to become less luminous and cooler even though hydrogen shell burning continues. These become cool helium white dwarfs. Very-high-mass stars develop into supergiants that follow an evolutionary track that takes them back and forth horizontally over the H–R diagram, at the right end constituting red supergiants. These usually end their life as a type II supernova. The most massive stars can become Wolf–Rayet stars without becoming giants or supergiants at all. Red giants with known planets: the M-type HD 208527, HD 220074 and, as of February 2014, a few tens of known K-giants including Pollux, Gamma Cephei and Iota Draconis. Although traditionally it has been suggested the evolution of a star into a red giant will render its planetary system, if present, uninhabitable, some research suggests that, during the evolution of a star along the red-giant branch, it could harbor a habitable zone for several billion years at 2 astronomical units (AU) out to around 100 million years at 9 AU out, giving perhaps enough time for life to develop on a suitable world. After the red-giant stage, there would for such a star be a habitable zone between 7 and 22 AU for an additional one billion years. Later studies have refined this scenario, showing how for a star the habitable zone lasts from 100 million years for a planet with an orbit similar to that of Mars to 210 million years for one that orbits at Saturn's distance to the Sun, the maximum time (370 million years) corresponding for planets orbiting at the distance of Jupiter. However, for planets orbiting a star in equivalent orbits to those of Jupiter and Saturn they would be in the habitable zone for 5.8 billion years and 2.1 billion years, respectively; for stars more massive than the Sun, the times are considerably shorter. As of June 2014, fifty giant planets have been discovered around giant stars. However, these giant planets are more massive than the giant planets found around solar-type stars. This could be because giant stars are more massive than the Sun (less massive stars will still be on the main sequence and will not have become giants yet) and more massive stars are expected to have more massive planets. However, the masses of the planets that have been found around giant stars do not correlate with the masses of the stars; therefore, the planets could be growing in mass during the stars' red giant phase. The growth in planet mass could be partly due to accretion from stellar wind, although a much larger effect would be Roche lobe overflow causing mass-transfer from the star to the planet when the giant expands out to the orbital distance of the planet. Many of the well-known bright stars are red giants, because they are luminous and moderately common. The red-giant branch variable star Gamma Crucis is the nearest M-class giant star at 88 light-years. The K0 red-giant branch star Arcturus is 36 light-years away. The Sun will exit the main sequence in approximately 5 billion years and start to turn into a red giant. As a red giant, the Sun will grow so large that it will engulf Mercury, Venus, and probably Earth.
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses ()) in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius large and the surface temperature around or lower. The appearance of the red giant is from yellow-orange to red, including the spectral types K and M, but also class S stars and most carbon stars.
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summarize: Shortly after World War II (1945–46) in one of the suburbs of Prague (it was shot in Michle), Eda Souček attends a boys' elementary school where he belongs to a class with a complete lack of discipline. After the class drives their teacher Maxová to a mental breakdown during one of her classes, the schoolmaster has to implement special measures. A new male teacher, Igor Hnízdo, is employed, who is said to be a great war hero. Authoritative Hnízdo immediately introduces corporal punishment which, as he explains, is not normally allowed but the school has received an exception from the Ministry of Education as a result of their dreadful behaviour. Despite his strict methods, the boys soon become charmed by the man. They love his battlefront stories and the fact that he is always armed and wears a uniform. Eda sees him as the very opposite of his own father whom he considers to be too cowardly. Hnízdo makes the same positive impression on the townspeople (including Eda's mother). Nevertheless, his persona is also surrounded by many controversies. For example, his war heroism is disputed as he is unable to provide any accurate information about his military service. There is even an unconfirmed rumour that Hnízdo was only guarding goats during the war. But the boys from his class ignore all negative comments and even fight those who are spreading the rumours. Hnízdo's reputation suffers after he is accused of having a sexual relationship with local twins who attend a girls' school in the same area. He is forced to leave because this is not the first time he has been involved in a similar affair. The formerly unmanageable boys begin to defend Hnízdo and call for his return. The accusation is finally withdrawn and Hnízdo comes back to the class. He states that the way they were dealing with the accusation is a proof that the physical punishments are no longer necessary. The original story was written by Zdeněk Svěrák. He used his own experiences both as a pupil of a similar school and as a former teacher. This is the first of the films created by the successful father screenwriter - son director duo. The others include "Akumulátor I." (1993), "Kolja" (1996), "Tmavomodrý svět" (2000) and "Vratné lahve" (2007). It was also the first non-documentary film by Jan Svěrák. Obecná škola is also notable because it includes one of the last roles for two prominent Czech actors Rudolf Hrušínský (his last big screen film) and Petr Čepek (appeared in two more films before his death). The film was also the first appearance of Jan Tříska in a Czech film since his emigration to the United States in 1977.
The Elementary School () is a 1991 Czechoslovak comedy-drama film directed by Jan Svěrák. The screenplay comes from the pen of his father Zdeněk Svěrák. The film was nominated for the Academy Award for Best Foreign Language Film in 1991 and is considered to belong among the best Czechoslovak films ever. A prequel, "Barefoot", was released in 2017.
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summarize: The young Miloš Hrma, who speaks with misplaced pride of his family of misfits and, is engaged as a newly trained station guard in a small railway station during the Second World War and the German occupation of Czechoslovakia. He admires himself in his new uniform, and looks forward, like his prematurely retired railwayman father, to avoiding real work. The sometimes pompous stationmaster is an enthusiastic pigeon-breeder with a kind wife, but is envious of the train dispatcher Hubička's success with women. Miloš holds an as-yet platonic love for the pretty, young conductor Máša. The experienced Hubička presses for details of their relationship and realizes that Miloš is still a virgin. The of the railway station is periodically disturbed by the arrival of the councillor, Zedníček, a Nazi collaborator, who spouts propaganda at the staff without success. At her initiative, Máša spends the night with Miloš, but in his youthful excitability he ejaculates prematurely before achieving penetration and then is unable to perform sexually; and the next day, despairing, he attempts suicide. He is saved, and a young doctor explains to him that "ejaculatio praecox" is normal at Miloš's age. The doctor recommends Miloš to "think of something else" (at which point Miloš volunteers an interest in football), and to seek the assistance of an experienced woman. During the nightshift, Hubička flirts with the young telegraphist, Zdenička, and imprints her thighs and buttocks with the office's rubber stamps. Her mother sees the stamps and complains to Hubička's superiors, and the ensuing scandal helps to frustrate the stationmaster's ambition of being promoted to inspector. The Germans and their collaborators are on edge, since their trains are being attacked by the partisans. A glamorous Resistance agent (a circus artist in peacetime), code-named Viktoria Freie, delivers a time bomb to Hubička for use in blowing up a large ammunition train. At Hubička's request, the "experienced" Viktoria also helps Miloš to resolve his sexual problem. The next day, at the crucial moment when the ammunition train is approaching, Hubička is caught up in a farcical disciplinary hearing, overseen by Zedníček, over his rubber-stamping of Zdenička's backside. In Hubička's place, Miloš, liberated by his experience with Viktoria from his former passivity, takes the time bomb and drops it from a semaphore gantry, that extends transversely above the tracks, onto the train. A machine-gunner on the train, spotting Miloš, sprays him with bullets, and his body falls onto the train. With the Nazi collaborator Zedníček winding up the disciplinary hearing, dismissing the Czech people as "nothing but laughing hyenas" (a phrase actually employed by the senior Nazi official Reinhard Heydrich), the implicit retort to his jibe comes in the form of a huge series of explosions that destroys the train. Now Hubička and the other railwaymen are indeed laughing — to express their joy at the blow to the Nazi occupiers — and it is left to a wistful Máša to pick up Miloš's uniform cap, hurled across the station by the power of the blast. The film is based on a 1965 novel of the same name by the noted Czech author Bohumil Hrabal, whose work Jiří Menzel had already begun to adapt in 1965 in the short "The Death of Mr. Balthazar", a segment from the anthology film of Hrabal stories "Pearls from the Deep". Barrandov Studios first offered the film project to the more experienced directors Evald Schorm and Vera Chytilova, neither of whom saw a way to adapt the book to film, before offering it to Menzel as his feature-film debut. Menzel and Hrabal worked together closely on the script, making a number of modifications to the novel. Menzel's first choice for the lead role of Miloš was Vladimír Pucholt, who however was occupied filming Jiří Krejčík's "Svatba jako řemen". At one point Menzel considered playing the role himself, but concluded that at almost 28 he was too old. Fifteen non-professional actors were tested, before the wife of Ladislav Fikar (a poet and publisher) came up with the suggestion of the pop singer Václav Neckář. Menzel has related that he himself took on the cameo role of the doctor only at the last minute after the actor originally cast failed to show up for shooting. Filming began in late February and lasted until the end of April 1966. Locations were used in and around the station building in Loděnice. The association between Menzel and Hrabal was to continue. They collaborated on the script of the long-banned film "Larks on a String", filmed in 1969 but not released until 1990. The film premiered in Czechoslovakia on 18 November 1966. Release outside Czechoslovakia took place in the following year. Bosley Crowther of "The New York Times" called "Closely Watched Trains" "as expert and moving in its way as was Jan Kadár's and Elmar Klos's "The Shop on Main Street" or Milos Forman's "Loves of a Blonde"," two roughly contemporary films from Czechoslovakia. Crowther wrote:What it appears Mr. Menzel is aiming at all through his film is just a wonderfully sly, sardonic picture of the embarrassments of a youth coming of age in a peculiarly innocent yet worldly provincial environment.... The charm of his film is in the quietness and slyness of his earthy comedy, the wonderful finesse of understatements, the wise and humorous understanding of primal sex. And it is in the brilliance with which he counterpoints the casual affairs of his country characters with the realness, the urgency and significance of those passing trains. "Variety"s reviewer wrote:The 28-year-old Jiri Menzel registers a remarkable directorial debut. His sense for witty situations is as impressive as his adroit handling of the players. A special word of praise must go to Bohumil Hrabal, the creator of the literary original; the many amusing gags and imaginative situations are primarily his. The cast is composed of wonderful types down the line. In his study of the Czechoslovak New Wave, Peter Hames places the film in a broader context, connecting it inter alia to the most famous anti-hero of Czech literature, Jaroslav Hašek's "The Good Soldier Švejk", a fictional World War 1 soldier whose artful evasion of duty and undermining of authority are sometimes held to epitomize characteristic Czech qualities: In its attitudes, if not its form, "Closely Observed Trains" is the Czech film that comes closest to the humour and satire of "The Good Soldier Švejk", not least because it is prepared to include the reality of the war as a necessary aspect of its comic vision. The attack on ideological dogmatism, bureaucracy and anachronistic moral values undoubtedly strikes wider targets than the period of Nazi Occupation. However, it would be wrong to reduce the film to a coded reflection on contemporary Czech society: the attitudes and ideas derive from the same conditions that originally inspired Hašek. Insofar as these conditions recur, under the Nazi Occupation or elsewhere, the response will be the same. The film won several international awards:
Closely Watched Trains () is a 1966 Czechoslovak film directed by Jiří Menzel and is one of the best-known products of the Czechoslovak New Wave. It was released in the United Kingdom as Closely Observed Trains. It is a coming-of-age story about a young man working at a train station in German-occupied Czechoslovakia during World War II. The film is based on a 1965 novel by Bohumil Hrabal. It was produced by Barrandov Studios and filmed on location in Central Bohemia. Released outside Czechoslovakia during 1967, it won the Best Foreign Language Oscar at the 40th Academy Awards in 1968.
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summarize: The word "constellation" comes from the Late Latin term, which can be translated as "set of stars"; it came into use in English during the 14th century. The Ancient Greek word for constellation is ἄστρον. These terms generally referred to a recognisable pattern of stars whose appearance is associated with mythological characters or creatures, earthbound animals, or objects. A more modern astronomical sense of the term "constellation" denotes one of the 88 IAU designated constellations recognized today. Colloquial usage does not draw a sharp distinction between "constellations" and smaller "asterisms" (pattern of stars), yet the modern accepted astronomical constellations employ such a distinction. E.g., the Pleiades and the Hyades are both asterisms, and each lies within the boundaries of the constellation of Taurus. Another example is the northern asterism popularly known as the Big Dipper (US) or the Plough (UK), composed of the seven brightest stars within the area of the IAU-defined constellation of Ursa Major. The southern False Cross asterism includes portions of the constellations Carina and Vela and the Summer Triangle is composed of the brightest stars in the constellations Lyra, Aquila and Cygnus. A constellation (or star), viewed from a particular latitude on Earth, that never sets below the horizon is termed circumpolar. From the North Pole or South Pole, all constellations south or north of the celestial equator are circumpolar. Depending on the definition, equatorial constellations may include those that lie between declinations 45° north and 45° south, or those that pass through the declination range of the ecliptic or zodiac ranging between 231⁄2° north, the celestial equator, and 231⁄2° south. Stars in constellations can appear near each other in the sky, but they usually lie at a variety of distances away from the Earth. Since each star has its own independent motion, all constellations will change slowly over time. After tens to hundreds of thousands of years, familiar outlines will become unrecognizable. Astronomers can predict the past or future constellation outlines by measuring individual stars' common proper motions or cpm by accurate astrometry and their radial velocities by astronomical spectroscopy. Both the 88 IAU recognized constellations and those that cultures have recognized throughout history are essentially imagined figures and shapes with only a certain basis in the actually observable sky. Many officially recognized constellations are based in the imaginations of ancient, Near Eastern and Mediterranean mythologies, but the physical reality of the Earth's position in the Milky Way still produces shapes that are connected by the human mind. For instance, Orion's Belt forms a more or less visually perfect line. H.A. Rey, who wrote popular books on astronomy, pointed out the imaginative nature of the constellations and their mythological, artistic basis, and the practical use of identifying them through definite images, according to the classical names they were given. It has been suggested that the 17,000-year-old cave paintings in Lascaux Southern France depict star constellations such as Taurus, Orion's Belt and the Pleiades. However, this view is not yet generally accepted among scientists. Inscribed stones and clay writing tablets from Mesopotamia (in modern Iraq) dating to 3000 BC provide the earliest generally accepted evidence for humankind's identification of constellations. It seems that the bulk of the Mesopotamian constellations were created within a relatively short interval from around 1300 to 1000 BC. Mesopotamian constellations appeared later in many of the classical Greek constellations. The oldest Babylonian catalogues of stars and constellations date back to the beginning of the Middle Bronze Age, most notably the "Three Stars Each" texts and the "MUL.APIN", an expanded and revised version based on more accurate observation from around 1000 BC. However, the numerous Sumerian names in these catalogues suggest that they built on older, but otherwise unattested, Sumerian traditions of the Early Bronze Age. The classical Zodiac is a revision of Neo-Babylonian constellations from the 6th century BC. The Greeks adopted the Babylonian constellations in the 4th century BC. Twenty Ptolemaic constellations are from the Ancient Near East. Another ten have the same stars but different names. Biblical scholar E. W. Bullinger interpreted some of the creatures mentioned in the books of Ezekiel and Revelation as the middle signs of the four quarters of the Zodiac, with the Lion as Leo, the Bull as Taurus, the Man representing Aquarius, and the Eagle standing in for Scorpio. The biblical Book of Job also makes reference to a number of constellations, including "bier", "fool" and "heap" (Job 9:9, 38:31–32), rendered as "Arcturus, Orion and Pleiades" by the KJV, but "‘Ayish" "the bier" actually corresponding to Ursa Major. The term "Mazzaroth", translated as "a garland of crowns", is a "hapax legomenon" in Job 38:32, and it might refer to the zodiacal constellations. There is only limited information on ancient Greek constellations, with some fragmentary evidence being found in the "Works and Days" of the Greek poet Hesiod, who mentioned the "heavenly bodies". Greek astronomy essentially adopted the older Babylonian system in the Hellenistic era, first introduced to Greece by Eudoxus of Cnidus in the 4th century BC. The original work of Eudoxus is lost, but it survives as a versification by Aratus, dating to the 3rd century BC. The most complete existing works dealing with the mythical origins of the constellations are by the Hellenistic writer termed pseudo-Eratosthenes and an early Roman writer styled pseudo-Hyginus. The basis of Western astronomy as taught during Late Antiquity and until the Early Modern period is the "Almagest" by Ptolemy, written in the 2nd century. In the Ptolemaic Kingdom, native Egyptian tradition of anthropomorphic figures represented the planets, stars, and various constellations. Some of these were combined with Greek and Babylonian astronomical systems culminating in the Zodiac of Dendera; it remains unclear when this occurred, but most were placed during the Roman period between 2nd to 4th centuries AD. The oldest known depiction of the zodiac showing all the now familiar constellations, along with some original Egyptian constellations, decans, and planets. Ptolemy's "Almagest" remained the standard definition of constellations in the medieval period both in Europe and in Islamic astronomy. Ancient China had a long tradition of observing celestial phenomena. Nonspecific Chinese star names, later categorized in the twenty-eight mansions, have been found on oracle bones from Anyang, dating back to the middle Shang dynasty. These constellations are some of the most important observations of Chinese sky, attested from the 5th century BC. Parallels to the earliest Babylonian (Sumerian) star catalogues suggest that the ancient Chinese system did not arise independently. Three schools of classical Chinese astronomy in the Han period are attributed to astronomers of the earlier Warring States period. The constellations of the three schools were conflated into a single system by Chen Zhuo, an astronomer of the 3rd century (Three Kingdoms period). Chen Zhuo's work has been lost, but information on his system of constellations survives in Tang period records, notably by Qutan Xida. The oldest extant Chinese star chart dates to that period and was preserved as part of the Dunhuang Manuscripts. Native Chinese astronomy flourished during the Song dynasty, and during the Yuan dynasty became increasingly influenced by medieval Islamic astronomy (see Treatise on Astrology of the Kaiyuan Era). As maps were prepared during this period on more scientific lines, they were considered as more reliable. A well known map from the Song period is the Suzhou Astronomical Chart, which was prepared with carvings of stars on the planisphere of the Chinese sky on a stone plate; it is done accurately based on observations, and it shows the supernova of the year of 1054 in Taurus. Influenced by European astronomy during the late Ming dynasty, charts depicted more stars but retained the traditional constellations. Newly observed stars were incorporated as supplementary to old constellations in the southern sky, which did not depict the traditional stars recorded by ancient Chinese astronomers. Further improvements were made during the later part of the Ming dynasty by Xu Guangqi and Johann Adam Schall von Bell, the German Jesuit and was recorded in Chongzhen Lishu (Calendrical Treatise of Chongzhen period, 1628). Traditional Chinese star maps incorporated 23 new constellations with 125 stars of the southern hemisphere of the sky based on the knowledge of Western star charts; with this improvement, the Chinese Sky was integrated with the World astronomy. Historically, the origins of the constellations of the northern and southern skies are distinctly different. Most northern constellations date to antiquity, with names based mostly on Classical Greek legends. Evidence of these constellations has survived in the form of star charts, whose oldest representation appears on the statue known as the Farnese Atlas, based perhaps on the star catalogue of the Greek astronomer Hipparchus. Southern constellations are more modern inventions, sometimes as substitutes for ancient constellations (e.g. Argo Navis). Some southern constellations had long names that were shortened to more usable forms; e.g. Musca Australis became simply Musca. Some of the early constellations were never universally adopted. Stars were often grouped into constellations differently by different observers, and the arbitrary constellation boundaries often led to confusion as to which constellation a celestial object belonged. Before astronomers delineated precise boundaries (starting in the 19th century), constellations generally appeared as ill-defined regions of the sky. Today they now follow officially accepted designated lines of Right Ascension and Declination based on those defined by Benjamin Gould in epoch 1875.0 in his star catalogue "Uranometria Argentina". The 1603 star atlas "Uranometria" of Johann Bayer assigned stars to individual constellations and formalized the division by assigning a series of Greek and Latin letters to the stars within each constellation. These are known today as Bayer designations. Subsequent star atlases led to the development of today's accepted modern constellations. The southern sky, below about −65° declination, was only partially catalogued by ancient Babylonians, Egyptian, Greeks, Chinese, and Persian astronomers of the north. Knowledge that northern and southern star patterns differed goes back to Classical writers, who describe, for example, the African circumnavigation expedition commissioned by Egyptian Pharaoh Necho II in c. 600 BC and those of Hanno the Navigator in c. 500 BC. However, much of this history was lost with the Destruction of the Library of Alexandria. The history of southern constellations is not straightforward. Different groupings and different names were proposed by various observers, some reflecting national traditions or designed to promote various sponsors. Southern constellations were important from the 14th to 16th centuries, when sailors used the stars for celestial navigation. Italian explorers who recorded new southern constellations include Andrea Corsali, Antonio Pigafetta, and Amerigo Vespucci. Many of the 88 IAU-recognized constellations in this region first appeared on celestial globes developed in the late 16th century by Petrus Plancius, based mainly on observations of the Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman. These became widely known through Johann Bayer's star atlas "Uranometria" of 1603. more were created in 1763 by the French astronomer Nicolas Louis de Lacaille appearing in his star catalogue, published in 1756. Several modern proposals have not survived. The French astronomers Pierre Lemonnier and Joseph Lalande, for example, proposed constellations that were once popular but have since been dropped. The northern constellation Quadrans Muralis survived into the 19th century (when its name was attached to the Quadrantid meteor shower), but is now divided between Boötes and Draco. A general list of 88 constellations was produced for the International Astronomical Union in 1922. It is roughly based on the traditional Greek constellations listed by Ptolemy in his "Almagest" in the 2nd century and Aratus' work "Phenomena", with early modern modifications and additions (most importantly introducing constellations covering the parts of the southern sky unknown to Ptolemy) by Petrus Plancius (1592, 1597/98 and 1613), Johannes Hevelius (1690) and Nicolas Louis de Lacaille (1763), who named fourteen constellations and renamed a fifteenth one. De Lacaille studied the stars of the southern hemisphere from 1750 until 1754 from Cape of Good Hope, when he was said to have observed more than 10,000 stars using a refracting telescope. In 1922, Henry Norris Russell produced a general list of 88 constellations and some useful abbreviations for them. However, these constellations did not have clear borders between them. In 1928, the International Astronomical Union (IAU) formally accepted 88 modern constellations, with contiguous boundaries along vertical and horizontal lines of right ascension and declination developed by Eugene Delporte that, together, cover the entire celestial sphere; this list was finally published in 1930. Where possible, these modern constellations usually share the names of their Graeco-Roman predecessors, such as Orion, Leo or Scorpius. The aim of this system is area-mapping, i.e. the division of the celestial sphere into contiguous fields. Out of the 88 modern constellations, 36 lie predominantly in the northern sky, and the other 52 predominantly in the southern. The boundaries developed by Delporte used data that originated back to epoch B1875.0, which was when Benjamin A. Gould first made his proposal to designate boundaries for the celestial sphere, a suggestion on which Delporte based his work. The consequence of this early date is that because of the precession of the equinoxes, the borders on a modern star map, such as epoch J2000, are already somewhat skewed and no longer perfectly vertical or horizontal. This effect will increase over the years and centuries to come. The Great Rift, a series of dark patches in the Milky Way, is more visible and striking in the southern hemisphere than in the northern. It vividly stands out when conditions are otherwise so dark that the Milky Way's central region casts shadows on the ground. Some cultures have discerned shapes in these patches and have given names to these "dark cloud constellations". Members of the Inca civilization identified various dark areas or dark nebulae in the Milky Way as animals and associated their appearance with the seasonal rains. Australian Aboriginal astronomy also describes dark cloud constellations, the most famous being the "emu in the sky" whose head is formed by the Coalsack, a dark nebula, instead of the stars. "General & Nonspecialized – Entire Celestial Heavens": "Northern Celestial Hemisphere & North Circumpolar Region": "Equatorial, Ecliptic, & Zodiacal Celestial Sky": "Southern Celestial Hemisphere & South Circumpolar Region":
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived outline or pattern, typically representing an animal, mythological person or creature, or an inanimate object.
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summarize: Compared to a star's entire history, the visual appearance of a supernova is very brief, perhaps spanning several months, so that the chances of observing one with the naked eye is roughly once in a lifetime. Only a tiny fraction of the 100 billion stars in a typical galaxy have the capacity to become a supernova, restricted to either those having large mass or extraordinarily rare kinds of binary stars containing white dwarfs. The earliest possible recorded supernova, known as HB9, could have been viewed and recorded by unknown Indian observers in. Later, SN 185 was viewed by Chinese astronomers in 185 AD. The brightest recorded supernova was SN 1006, which occurred in 1006 AD and was described by observers across China, Japan, Iraq, Egypt, and Europe. The widely observed supernova SN 1054 produced the Crab Nebula. Supernovae SN 1572 and SN 1604, the latest to be observed with the naked eye in the Milky Way galaxy, had notable effects on the development of astronomy in Europe because they were used to argue against the Aristotelian idea that the universe beyond the Moon and planets was static and unchanging. Johannes Kepler began observing SN 1604 at its peak on October 17, 1604, and continued to make estimates of its brightness until it faded from naked eye view a year later. It was the second supernova to be observed in a generation (after SN 1572 seen by Tycho Brahe in Cassiopeia). There is some evidence that the youngest galactic supernova, G1.9+0.3, occurred in the late 19th century, considerably more recently than Cassiopeia A from around 1680. Neither supernova was noted at the time. In the case of G1.9+0.3, high extinction along the plane of the galaxy could have dimmed the event sufficiently to go unnoticed. The situation for Cassiopeia A is less clear. Infrared light echos have been detected showing that it was a type IIb supernova Early work on what was originally believed to be simply a new category of novae was performed during the 1920s. These were variously called "upper-class Novae", "Hauptnovae", or "giant novae". The name "supernovae" is thought to have been coined by Walter Baade and Fritz Zwicky in lectures at Caltech during 1931. It was used, as "super-Novae", in a journal paper published by Knut Lundmark in 1933, and in a 1934 paper by Baade and Zwicky. By 1938, the hyphen had been lost and the modern name was in use. Because supernovae are relatively rare events within a galaxy, occurring about three times a century in the Milky Way, obtaining a good sample of supernovae to study requires regular monitoring of many galaxies. Supernovae in other galaxies cannot be predicted with any meaningful accuracy. Normally, when they are discovered, they are already in progress. To use supernovae as standard candles for measuring distance, observation of their peak luminosity is required. It is therefore important to discover them well before they reach their maximum. Amateur astronomers, who greatly outnumber professional astronomers, have played an important role in Supernova discoveries are reported to the International Astronomical Union's Central Bureau for Astronomical Telegrams, which sends out a circular with the name it assigns to that supernova. The name is formed from the prefix "SN", followed by the year of discovery, suffixed with a one or two-letter designation. The first 26 supernovae of the year are designated with a capital letter from "A" to "Z". Afterward pairs of lower-case letters are used: "aa", "ab", and so on. Hence, for example, "SN 2003C" designates the third supernova reported in the year 2003. The last supernova of 2005, SN 2005nc, was the 367th (14 × Astronomers classify supernovae according to their light curves and the absorption lines of different chemical elements that appear in their spectra. If a supernova's spectrum contains lines of hydrogen (known as the Balmer series in the visual portion of the spectrum) it is classified "Type II"; otherwise it is "Type I". In each of these two types there are subdivisions according to the presence of lines from other elements or the shape of the light curve (a graph of the supernova's apparent magnitude as a function of time). Type I supernovae are subdivided on the basis of their spectra, with Type Ia showing a strong ionised silicon absorption line. Type I supernovae without this strong line are classified as Type Ib and Ic, with Type Ib showing strong neutral helium lines and Type Ic lacking them. The light curves are all similar, although Type Ia are generally brighter at peak luminosity, but The supernovae of Type II can also be sub-divided based on their spectra. While most Type II supernovae show very broad emission lines which indicate expansion velocities of many thousands of kilometres per second, some, such as SN 2005gl, have relatively narrow features in their spectra. These are called Type IIn, where the 'n' stands for 'narrow'. A few supernovae, such as SN 1987K and SN 1993J, appear to change types: they show lines of hydrogen at early times, but, over a period of weeks to months, Fritz Zwicky defined additional supernovae types based on a very few examples that did not cleanly fit the parameters for Type I or Type II supernovae. SN 1961i in NGC 4303 was the prototype and only member of the Type III supernova class, noted for its broad light curve maximum and broad hydrogen Balmer lines that were slow to develop in the spectrum. SN 1961f in NGC 3003 was the prototype and only member of the Type IV class, with a light curve Supernovae type codes, as described above, are "taxonomic": the type number describes the light observed from the supernova, not necessarily its cause. For example, Type Ia supernovae are produced by runaway fusion ignited on degenerate white dwarf progenitors, while the spectrally similar Type Ib/c are produced from massive Wolf–Rayet progenitors by core collapse. The following summarizes what is currently believed to be the most plausible explanations for supernovae. A white dwarf star may accumulate sufficient material from a stellar companion to raise its core temperature enough to ignite carbon fusion, at which point it undergoes runaway nuclear fusion, completely disrupting it. There are three avenues by which this detonation is theorized to happen: stable accretion of material from a companion, the collision of two white dwarfs, or accretion that causes ignition in a shell that then ignites the core. The dominant mechanism by which Type Ia supernovae are produced remains unclear. Despite this uncertainty in how Type Ia supernovae are produced, Type Ia supernovae have very uniform properties and are useful standard candles over intergalactic distances. Some calibrations are required to compensate for the gradual change in properties or different frequencies of abnormal luminosity supernovae at high redshift, and for small variations in brightness identified by light curve shape or spectrum. There are several means by which a supernova of this type can form, but they share a common underlying mechanism. If a carbon-oxygen white dwarf accreted enough matter to reach the Chandrasekhar limit of about 1.44 solar masses () (for a non-rotating star), it would no longer be able to support the bulk of its mass through electron degeneracy pressure and would begin to collapse. However, the current view is that this limit is not normally attained; increasing temperature and density inside the core ignite carbon fusion as the star approaches the limit (to within about 1%) before collapse is initiated. For a core primarily composed of oxygen, neon and magnesium, the collapsing white dwarf will typically form a neutron star. In this case, only a fraction of the star's mass will be ejected during the collapse. Within a few seconds, a substantial fraction of the matter in the white dwarf undergoes nuclear fusion, releasing enough energy (1–) to unbind the star in a supernova. An outwardly expanding shock wave is generated, with Another model for the formation of Type Ia supernovae involves the merger of two white dwarf stars, with the combined mass momentarily exceeding the Chandrasekhar limit. There is much variation in this type of event, and, in many cases, there may be no supernova at all, in which case they will have a broader and less luminous light curve than the more normal SN Type Ia. Abnormally bright Type Ia supernovae occur when the white dwarf already has a mass higher than the Very massive stars can undergo core collapse when nuclear fusion becomes unable to sustain the core against its own gravity; passing this threshold is the cause of all types of supernova except Type Ia. The collapse may cause violent expulsion of the outer layers of the star resulting in a supernova, or the release of gravitational potential energy may be insufficient and the star may collapse into a black hole or neutron star with little radiated energy. Core collapse can be caused by several different mechanisms: electron capture; exceeding the Chandrasekhar limit; pair-instability; or photodisintegration. When a massive star develops an iron core larger than the Chandrasekhar mass it will no longer be able to support itself by electron degeneracy pressure and will collapse further to a neutron star or black hole. Electron capture by magnesium in a degenerate O/Ne/Mg core causes gravitational collapse followed by explosive oxygen fusion, with very similar results. Electron-positron pair production in a large post-helium burning core removes thermodynamic support and causes initial collapse followed by runaway fusion, resulting in a pair-instability supernova. A sufficiently large and hot stellar core may generate gamma-rays energetic enough to initiate photodisintegration directly, which will cause a complete collapse of the core. The table below lists the known reasons for core collapse in massive stars, the types of stars in which they occur, their associated supernova type, and the remnant produced. The metallicity is the proportion of elements other than hydrogen or helium, as compared to the Sun. The initial mass is the mass of the star prior to the supernova event, given in multiples of the Sun's mass, although the mass at the time of the supernova may be much lower. Type IIn supernovae are not listed in the table. They can be produced by various types of core collapse in different progenitor stars, possibly even by Type Ia white dwarf ignitions, although it seems that most will be from iron core collapse in luminous supergiants or hypergiants (including LBVs). The narrow spectral lines for which they are named occur because the supernova is expanding into a small dense cloud of circumstellar material. It appears that a significant proportion of supposed The core collapse of some massive stars may not result in a visible supernova. The main model for this is a sufficiently massive core that the kinetic energy is insufficient to reverse the A historic puzzle concerned the source of energy that can maintain the optical supernova glow for months. Although the energy that disrupts each type of supernovae is delivered promptly, the light curves are dominated by subsequent radioactive heating of the rapidly expanding ejecta. Some have considered rotational energy from the central pulsar. The ejecta gases would dim quickly without some energy input to keep it hot. The intensely radioactive nature of the ejecta gases, which is now known to be correct for most supernovae, was first calculated on sound nucleosynthesis grounds in the late 1960s. It was not until SN 1987A that direct observation of gamma-ray lines unambiguously identified the major radioactive nuclei. It is now known by direct observation that much of the light curve (the graph of luminosity as a function of time) after the occurrence of a Type II Supernova, such as SN 1987A, is explained by those predicted radioactive decays. Although the luminous emission consists of optical photons, it is the radioactive power absorbed by the ejected gases that keeps the remnant hot enough A long-standing puzzle surrounding Type II supernovae is why the remaining compact object receives a large velocity away from the epicentre; pulsars, and thus neutron stars, are observed to have high velocities, and black holes presumably do as well, although they are far harder to observe in isolation. The initial impetus can be substantial, propelling an object of more than a solar mass at a velocity of 500 km/s or greater. This indicates an expansion asymmetry, but the mechanism by which momentum is transferred to the compact object a puzzle. Proposed explanations for this kick include convection in the collapsing star and jet production during Although supernovae are primarily known as luminous events, the electromagnetic radiation they release is almost a minor side-effect. Particularly in the case of core collapse supernovae, the emitted electromagnetic radiation is a tiny fraction of the total energy released during the event. There is a fundamental difference between the balance of energy production in the different types of supernova. In Type Ia white dwarf detonations, most of the energy is directed into heavy element synthesis and the kinetic energy of the ejecta. In core collapse supernovae, the vast majority of the energy is directed into neutrino emission, and while some of this apparently powers the observed destruction, The supernova classification type is closely tied to the type of star at the time of the collapse. The occurrence of each type of supernova depends dramatically on the metallicity, and hence the age of the host galaxy. Type Ia supernovae are produced from white dwarf stars in binary systems and occur in all galaxy types. Core collapse supernovae are only found in galaxies undergoing current or very recent star formation, since they result from short-lived massive stars. They are most commonly found in Type Sc spirals, but also in the arms of other spiral galaxies and in Supernovae are a major source of elements in the interstellar medium from oxygen through to rubidium, though the theoretical abundances of the elements produced or seen in the spectra varies significantly depending on the various supernova types. Type Ia supernovae produce mainly silicon and iron-peak elements, metals such as nickel and iron. Core collapse supernovae eject much smaller quantities of the iron-peak elements than type Ia supernovae, but larger masses of light alpha elements such as oxygen and neon, and elements heavier than zinc. The latter is especially true with electron capture supernovae. The bulk of the Remnants of many supernovae consist of a compact object and a rapidly expanding shock wave of material. This cloud of material sweeps up surrounding interstellar medium during a free expansion phase, which can last for up to two centuries. The wave then gradually undergoes a period of adiabatic expansion, and will slowly cool and mix with the surrounding interstellar medium over a period of about 10,000 years. The Big Bang produced hydrogen, helium, and traces of lithium, while all heavier elements are synthesized in stars and supernovae. Supernovae tend to enrich the surrounding interstellar medium with elements other than hydrogen and helium, which usually astronomers refer to as "metals". These injected elements ultimately enrich the molecular clouds that are the sites of star Supernova remnants are thought to accelerate a large fraction of galactic primary cosmic rays, but direct evidence for cosmic ray production has only Supernovae are potentially strong galactic sources of gravitational waves, but none have so far been A near-Earth supernova is a supernova close enough to the Earth to have noticeable effects on its biosphere. Depending upon the type and energy of the supernova, it could be as far as 3000 light-years away. In 1996 it was theorized that traces of past supernovae might be detectable on Earth in the form of metal isotope signatures in rock strata. Iron-60 enrichment was later reported in deep-sea rock of the Pacific Ocean. In 2009, elevated levels of nitrate ions were found in Antarctic ice, which The next supernova in the Milky Way will likely be detectable even if it occurs on the far side of the galaxy. It is likely to be produced by the collapse of an unremarkable red supergiant and it is very probable that it will already have been catalogued in infrared surveys such as 2MASS. There is a smaller chance that the next core collapse supernova will be produced by a different type of massive star such as a yellow hypergiant, luminous blue variable, or Wolf–Rayet. The chances of the next supernova being a Type Ia produced by a white dwarf are calculated to be about a third of those for a core collapse supernova. Again it should be observable wherever it occurs, but it is less likely that the progenitor will ever have been observed. It isn't even known exactly what a Type Ia progenitor system looks like, and it is difficult to detect them beyond a few parsecs. The total supernova rate in our galaxy is estimated to be between 2 and 12 per century, although we haven't actually observed one for several centuries. Statistically, the next supernova is likely to be produced from an otherwise unremarkable red supergiant, but it is difficult to identify which of those supergiants are in the final stages of heavy element fusion in their cores and which have millions of years left. The most-massive red supergiants shed their atmospheres and evolve to Wolf–Rayet stars before their cores collapse. All Wolf–Rayet stars end their lives from the Wolf–Rayet phase within a million years or so, but again it is difficult to identify those that are closest to core collapse. One class that is expected to have no more than a few thousand years before exploding are the WO Wolf–Rayet stars, which are known to have exhausted their core helium. Only eight of them are known, and only four of those are in the Milky Way. A number of close or well known stars have been identified as possible core collapse supernova candidates: the red supergiants Antares and Betelgeuse; the yellow hypergiant Rho Cassiopeiae; the luminous blue variable Eta Carinae that has already produced a supernova impostor; and the brightest component, a Wolf–Rayet star, in the Regor or Gamma Velorum system. Others have gained notoriety as possible, although not very likely, progenitors for a gamma-ray burst; for example WR 104. Identification of candidates for a Type Ia supernova is much more speculative. Any binary with an accreting white dwarf might produce a supernova although the exact mechanism and timescale is still debated. These systems are faint and difficult to identify, but the novae and recurrent novae are such systems that conveniently advertise themselves. One example is U Scorpii. The nearest known Type Ia supernova candidate is IK Pegasi (HR 8210), located at a distance of 150 light-years, but observations suggest it will be several million years before the white dwarf can accrete the critical mass required to become a Type Ia supernova.
A supernova ( plural: supernovae or supernovas, abbreviations: SN and SNe) is a powerful and luminous stellar explosion. This transient astronomical event occurs during the last evolutionary stages of a massive star or when a white dwarf is triggered into runaway nuclear fusion. The original object, called the "progenitor", either collapses to a neutron star or black hole, or it is completely destroyed. The peak optical luminosity of a supernova can be comparable to that of an entire galaxy, before fading over several weeks or months.
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summarize: The history of accounting is thousands of years old and can be traced to ancient civilizations. The early development of accounting dates back to ancient Mesopotamia, and is closely related to developments in writing, counting and money; there is also evidence of early forms of bookkeeping in ancient Iran, and early auditing systems by the ancient Egyptians and Babylonians. By the time of Emperor Augustus, the Roman government had access to detailed financial information. Double-entry bookkeeping was pioneered in the Jewish community of the early-medieval Middle East and was further refined in medieval Europe. With the development of joint-stock companies, accounting split into financial accounting and management accounting. The first published work on a double-entry bookkeeping system was the "Summa de arithmetica", published in Italy in 1494 by Luca Pacioli (the "Father of Accounting"). Accounting began to transition into an organized profession in the nineteenth century, with local professional bodies in England merging to form the Institute of Chartered Accountants in England and Wales in 1880. Both the words accounting and accountancy were in use in Great Britain by the mid-1800s, and are derived from the words "accompting" and "accountantship" used in the 18th century. In Middle English (used roughly between the 12th and the late 15th century) the verb "to account" had the form "accounten", which was derived from the Old French word "aconter", which is in turn related to the Vulgar Latin word "computare", meaning "to reckon". The base of "computare" is "putare", which "variously meant to prune, to purify, to correct an account, hence, to count or calculate, as well as to think." The word "accountant" is derived from the French word, which is also derived from the Italian and Latin word. The word was formerly written in English as "accomptant", but in process of time the word, which was always pronounced by dropping the "p", became gradually changed both in pronunciation and in orthography to its present form. Accounting has variously been defined as the keeping or preparation of the financial records of an entity, the analysis, verification and reporting of such records and "the principles and procedures of accounting"; it also refers to the job of being an accountant. Accountancy refers to the occupation or profession of an accountant, particularly in British English. Accounting has several subfields or subject areas, including financial accounting, management accounting, auditing, taxation and accounting information systems. Financial accounting focuses on the reporting of an organization's financial information to external users of the information, such as investors, potential investors and creditors. It calculates and records business transactions and prepares financial statements for the external users in accordance with generally accepted accounting principles (GAAP). GAAP, in turn, arises from the wide agreement between accounting theory and practice, and change over time to meet the needs of decision-makers. Financial accounting produces past-oriented reports—for example the financial statements prepared in 2006 reports on performance in 2005—on an annual or quarterly basis, generally about the organization as a whole. This branch of accounting is also studied as part of the board exams for qualifying as an actuary. These two types of professionals, accountants and actuaries, have created a culture of being archrivals. Management accounting focuses on the measurement, analysis and reporting of information that can help managers in making decisions to fulfill the goals of an organization. In management accounting, internal measures and reports are based on cost-benefit analysis, and are not required to follow the generally accepted accounting principle (GAAP). In 2014 CIMA created the Global Management Accounting Principles (GMAPs). The result of research from across 20 countries in five continents, the principles aim to guide best practice in the discipline. Management accounting produces future-oriented reports—for example the budget for 2006 is prepared in 2005—and the time span of reports varies widely. Such reports may include both financial and non financial information, and may, for example, focus on specific products and departments. Auditing is the verification of assertions made by others regarding a payoff, and in the context of accounting it is the "unbiased examination and evaluation of the financial statements of an organization". Audit is a professional service that is systematic and conventional. An audit of financial statements aims to express or disclaim an opinion on the financial statements. The auditor expresses an opinion on the fairness with which the financial statements presents the financial position, results of operations, and cash flows of an entity, in accordance with the generally acceptable accounting principle (GAAP) and "in all material respects". An auditor is also required to identify circumstances in which the generally acceptable accounting principles (GAAP) has not been consistently observed. An accounting information system is a part of an organization's information system that focuses on processing accounting data. Many corporations use artificial intelligence-based information systems. Banking and finance industry is using AI as fraud detection. Retail industry is using AI for customer services. AI is also used in cybersecurity industry. It involves computer hardware and software systems and using statistics and modeling. Tax accounting in the United States concentrates on the preparation, analysis and presentation of tax payments and tax returns. The U.S. tax system requires the use of specialised accounting principles for tax purposes which can differ from the generally accepted accounting principles (GAAP) for financial reporting. U.S. tax law covers four basic forms of business ownership: sole proprietorship, partnership, corporation, and limited liability company. Corporate and personal income are taxed at different rates, both varying according to income levels and including varying marginal rates (taxed on each additional dollar of income) and average rates (set as a percentage of overall income). Forensic accounting is a specialty practice area of accounting that describes engagements that result from actual or anticipated disputes or litigation. "Forensic" means "suitable for use in a court of law," and it is to that standard and potential outcome that forensic accountants generally have to work. Professional accounting bodies include the American Institute of Certified Public Accountants (AICPA) and the other 179 members of the International Federation of Accountants (IFAC), including Institute of Chartered Accountants of Scotland (ICAS), CPA Australia, Institute of Chartered Accountants of India, Association of Chartered Certified Accountants (ACCA) and Institute of Chartered Accountants in England and Wales (ICAEW). Professional bodies for subfields of the accounting professions also exist, for example the Chartered Institute of Management Accountants (CIMA) in the UK and Institute of management accountants in the United States. Many of these professional bodies offer education and training including qualification and administration for various accounting designations, such as certified public accountant (AICPA) and chartered accountant. Depending on its size, a company may be legally required to have their financial statements audited by a qualified auditor, and audits are usually carried out by accounting firms. Accounting firms grew in the United States and Europe in the late nineteenth and early twentieth century, and through several mergers there were large international accounting firms by the mid-twentieth century. Further large mergers in the late twentieth century led to the dominance of the auditing market by the "Big Five" accounting firms: Arthur Andersen, Deloitte, Ernst & Young, KPMG and PricewaterhouseCoopers. The demise of Arthur Andersen following the Enron scandal reduced the Big Five to the Big Four. Generally accepted accounting principles (GAAP) are accounting standards issued by national regulatory bodies. In addition, the International Accounting Standards Board (IASB) issues the International Financial Reporting Standards (IFRS) implemented by 147 countries. While standards for international audit and assurance, ethics, education, and public sector accounting are all set by independent standard settings boards supported by IFAC. The International Auditing and Assurance Standards Board sets international standards for auditing, assurance, and quality control; the International Ethics Standards Board for Accountants (IESBA) sets the internationally appropriate principles- based "Code of Ethics for Professional Accounts" the International Accounting Education Standards Board (IAESB) sets professional accounting education standards; International Public Sector Accounting Standards Board (IPSASB) sets accrual-based international public sector accounting standards Organizations in individual countries may issue accounting standards unique to the countries. For example, in the United States the Financial Accounting Standards Board (FASB) issues the Statements of Financial Accounting Standards, which form the basis of US GAAP, and in the United Kingdom the Financial Reporting Council (FRC) sets accounting standards. However, as of 2012 "all major economies" have plans to converge towards or adopt the IFRS. At least a bachelor's degree in accounting or a related field is required for most accountant and auditor job positions, and some employers prefer applicants with a master's degree. A degree in accounting may also be required for, or may be used to fulfill the requirements for, membership to professional accounting bodies. For example, the education during an accounting degree can be used to fulfill the American Institute of CPA's (AICPA) 150 semester hour requirement, and associate membership with the Certified Public Accountants Association of the UK is available after gaining a degree in finance or accounting. A doctorate is required in order to pursue a career in accounting academia, for example to work as a university professor in accounting. The Doctor of Philosophy (PhD) and the Doctor of Business Administration (DBA) are the most popular degrees. The PhD is the most common degree for those wishing to pursue a career in academia, while DBA programs generally focus on equipping business executives for business or public careers requiring research skills and qualifications. Professional accounting qualifications include the Chartered Accountant designations and other qualifications including certificates and diplomas. In Scotland, chartered accountants of ICAS undergo Continuous Professional Development and abide by the ICAS code of ethics. In England and Wales, chartered accountants of the ICAEW undergo annual training, and are bound by the ICAEW's code of ethics and subject to its disciplinary procedures. In the United States, the requirements for joining the AICPA as a Certified Public Accountant are set by the Board of Accountancy of each state, and members agree to abide by the AICPA's Code of Professional Conduct and Bylaws. The ACCA is the largest global accountancy body with over 320,000 members and the organisation provides an ‘IFRS stream’ and a ‘UK stream’. Students must pass a total of 14 exams, which are arranged across three papers. Accounting research is research in the effects of economic events on the process of accounting, the effects of reported information on economic events, and the roles of accounting in organizations and society.. It encompasses a broad range of research areas including financial accounting, management accounting, auditing and taxation. Accounting research is carried out both by academic researchers and practicing accountants. Methodologies in academic accounting research include archival research, which examines "objective data collected from repositories"; experimental research, which examines data "the researcher gathered by administering treatments to subjects"; analytical research, which is "based on the act of formally modeling theories or substantiating ideas in mathematical terms"; interpretive research, which emphasizes the role of language, interpretation and understanding in accounting practice, "highlighting the symbolic structures and taken-for-granted themes which pattern the world in distinct ways"; critical research, which emphasizes the role of power and conflict in accounting practice; case studies; computer simulation; and field research. Empirical studies document that leading accounting journals publish in total fewer research articles than comparable journals in economics and other business disciplines, and consequently, accounting scholars are relatively less successful in academic publishing than their business school peers. Due to different publication rates between accounting and other business disciplines, a recent study based on academic author rankings concludes that the competitive value of a single publication in a top-ranked journal is highest in accounting and lowest in marketing. Many accounting practices have been simplified with the help of accounting computer-based software. An Enterprise resource planning (ERP) system is commonly used for a large organisation and it provides a comprehensive, centralized, integrated source of information that companies can use to manage all major business processes, from purchasing to manufacturing to human resources. Accounting information systems have reduced the cost of accumulating, storing, and reporting managerial accounting information and have made it possible to produce a more detailed account of all data that is entered into any given system. The year 2001 witnessed a series of financial information frauds involving Enron, auditing firm Arthur Andersen, the telecommunications company WorldCom, Qwest and Sunbeam, among other well-known corporations. These problems highlighted the need to review the effectiveness of accounting standards, auditing regulations and corporate governance principles. In some cases, management manipulated the figures shown in financial reports to indicate a better economic performance. In others, tax and regulatory incentives encouraged over-leveraging of companies and decisions to bear extraordinary and unjustified risk. The Enron scandal deeply influenced the development of new regulations to improve the reliability of financial reporting, and increased public awareness about the importance of having accounting standards that show the financial reality of companies and the objectivity and independence of auditing firms. In addition to being the largest bankruptcy reorganization in American history, the Enron scandal undoubtedly is the biggest audit failure. It involved a financial scandal of Enron Corporation and their auditors Arthur Andersen, which was revealed in late 2001. The scandal caused the dissolution of Arthur Andersen, which at the time was one of the five largest accounting firms in the world. After a series of revelations involving irregular accounting procedures conducted throughout the 1990s, Enron filed for Chapter 11 bankruptcy protection in December 2001. One consequence of these events was the passage of Sarbanes–Oxley Act in the United States 2002, as a result of the first admissions of fraudulent behavior made by Enron. The act significantly raises criminal penalties for securities fraud, for destroying, altering or fabricating records in federal investigations or any scheme or attempt to defraud shareholders. An accounting error is an unintentional error in an accounting entry, often immediately fixed when spotted. An accounting error should not be confused with fraud, which is an intentional act to hide or alter entries.
Accounting or accountancy is the measurement, processing, and communication of financial and non financial information about economic entities such as businesses and corporations. Accounting, which has been called the "language of business", measures the results of an organization's economic activities and conveys this information to a variety of users, including investors, creditors, management, and regulators. Practitioners of accounting are known as accountants. The terms "accounting" and "financial reporting" are often used as synonyms.
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summarize: The Central Bohemian Region is divided into 12 districts: Příbram District is the region's largest district in terms of area (15% of the total region's area), while Prague-West District is the smallest one (5%). In 2019, the region counted in total 1,144 municipalities where of 26 were municipalities with a delegated municipal office. 1,028 municipalities had less than 2,000 inhabitants and they accounted for 41% of the total population of the region. 82 municipalities had a status of town. With an area of 11,014 km2, the Central Bohemian Region is the largest region of the Czech Republic, occupying 14% of its total area. The region has relatively diversified terrain. The highest point of the region is located on Tok hill (865 m) in Brdy Highlands in the south-eastern part of the region. The lowest point of the region is situated on the water surface of the Elbe River (Czech: Labe) near Dolní Beřkovice. The region is divided into two landscape types. The north-eastern part is formed by the Polabí lowlands with a high share of land being used for agricultural purposes and deciduous forests. The south-western part of the region is hilly with coniferous and mixed forests. Important rivers in the region are Elbe, Vltava, Berounka, Jizera and Sázava. On the Vltava river, a series of nine dams (Czech: Vltavská kaskáda) was constructed throughout the 20th century. The agricultural land accounts for 83.5% of all land in the region, which 11p.p. more than the national average. The highest share of the agricultural land can be found in Polabí, especially in Kolín and Nymburk districts. There are a number of landscape parks located in the region. Křivoklátsko is the largest and most important landscape park in the region, being at the same time a UNESCO Biosphere Reservation. Another remarkable area is the Bohemian Karst, the largest karst area in the Czech republic, where the Koněprusy Caves (Czech: Koněpruské jeskyně) are located. Finally, a large part of Kokořínsko Landscape Park is situated in the Central Bohemian Region. As of January 1, 2019 the Central Bohemian Region had 1,369,332 inhabitants and was the most populous region in the country. About 53% of the inhabitants lived in towns or cities. This is the lowest proportion among the regions of the Czech Republic. Since the second half of the 1990s the areas surrounding Prague have been significantly influenced by suburbanization. High numbers of young people have moved to the region and since 2006 the region has been experiencing a natural population growth. In 2019, the average age in the region was 41.2 years, the lowest number among the regions in the Czech Republic. The table shows cities and towns in the region that had more than 10,000 inhabitants (as of January 1, 2019): The Gross domestic product (GDP) of the region was 24.1 billion € in 2018, accounting for 11.6% of Czech economic output. GDP per capita adjusted for purchasing power was 25,300 € or 82% of the EU27 average in the same year. The GDP per employee was 84% of the EU average, which makes Central Bohemia one of the wealthiest regions in the Czech Republic. Six out of ten employees in the region work in the tertiary sector and the share of this sector on the total employment has been increasing over time. On the other hand, the share of primary and secondary sector has been decreasing. The unemployment rate in the region is in the long-term lower than the national average. As of December 31, 2012 the registered unemployment rate was 7.07%. However, there were considerable differences in the unemployment rate within the region. The lowest unemployment rate was in Prague-East District (3.35%) while the highest in Příbram District (10.10%). The average wage in the region in 2012 was CZK 24,749 (approximately EUR 965). The most important branches of industry in the region are mechanical engineering, chemical industry and food industry. Other significant industries are glass production, ceramics and printing. On the other hand, some traditional industries such as steel industry, leather manufacturing and coal mining have been declining in the recent period. In 2006, 237 industrial companies with 100 or more employees were active in the region. A car manufacturer ŠKODA AUTO a.s. Mladá Boleslav became a company of nationwide importance. Another car manufacturer which is active in the region is TPCA Czech, s.r.o. in Kolín. The north-eastern part of the region has very favourable conditions for agriculture. The agriculture in the region is oriented especially in crop farming, namely the production of wheat, barley, sugar beet and in suburban areas also fruit farming, vegetable growing and floriculture. Since the beginning of the 1990s the employment in agriculture, forestry and fishing has been decreasing. The region has an advantageous position thanks to its proximity to the capital. A significant proportion of region's population commutes daily to Prague for work or to schools. Compared to other regions, the Central Bohemian region has the densest (and the most overloaded) transport network. The roads and railways connecting the capital with other regions all cross the Central Bohemian region. Central Bohemia official tourist board is based in Husova street 156/21 Prague 1 Old Town. The official website of Central bohemia is www.centralbohemia.eu (Currently under reconstruction). There are also social pages on Faceboook and Instagram.
The Central Bohemian Region (, ) is an administrative unit () of the Czech Republic, located in the central part of its historical region of Bohemia. Its administrative centre is in the Czech capital Prague (), which lies in the centre of the region. However, the city is not part of it but is a region of its own.
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summarize: UNESCO and its mandate for international cooperation can be traced back to a League of Nations resolution on 21 September 1921, to elect a Commission to study feasibility. This new body, the International Committee on Intellectual Cooperation (ICIC) was created in 1922. On 18 December 1925, the International Bureau of Education (IBE) began work as a non-governmental organization in the service of international educational development. However, the onset of World War II largely interrupted the work of these predecessor organizations. After the signing of the Atlantic Charter and the Declaration of the United Nations, the Conference of Allied Ministers of Education (CAME) began meetings in London which continued from 16 November 1942 to 5 December 1945. On 30 October 1943, the necessity for an international organization was expressed in the Moscow Declaration, agreed upon by China, the United Kingdom, the United States and the USSR. This was followed by the Dumbarton Oaks Conference proposals of 9 October 1944. Upon the proposal of CAME and in accordance with the recommendations of the United Nations Conference on International Organization (UNCIO), held in San Francisco in April–June 1945, a United Nations Conference for the establishment of an educational and cultural organization (ECO/CONF) was convened in London 1–16 November 1945 with 44 governments represented. The idea of UNESCO was largely developed by Rab Butler, the Minister of Education for the United Kingdom, who had a great deal of influence in its development. At the ECO/CONF, the Constitution of UNESCO was introduced and signed by 37 countries, and a Preparatory Commission was established. The Preparatory Commission operated between 16 November 1945, and 4 November 1946—the date when UNESCO's Constitution came into force with the deposit of the twentieth ratification by a member state. The first General Conference took place from 19 November to 10 December 1946, and elected Dr. Julian Huxley to Director-General. The Constitution was amended in November 1954 when the General Conference resolved that members of the Executive Board would be representatives of the governments of the States of which they are nationals and would not, as before, act in their personal capacity. This change in governance distinguished UNESCO from its predecessor, the ICIC, in how member states would work together in the organization's fields of competence. As member states worked together over time to realize UNESCO's mandate, political and historical factors have shaped the organization's operations in particular during the Cold War, the decolonization process, and the dissolution of the USSR. Among the major achievements of the organization is its work against racism, for example through influential statements on race starting with a declaration of anthropologists (among them was Claude Lévi-Strauss) and other scientists in 1950 and concluding with the 1978 Declaration on Race and Racial Prejudice. In 1956, the Republic of South Africa withdrew from UNESCO saying that some of the organization's publications amounted to "interference" in the country's "racial problems". South Africa rejoined the organization in 1994 under the leadership of Nelson Mandela. UNESCO's early work in the field of education included the pilot project on fundamental education in the Marbial Valley, Haiti, started in 1947. This project was followed by expert missions to other countries, including, for example, a mission to Afghanistan in 1949. In 1948, UNESCO recommended that Member States should make free primary education compulsory and universal. In 1990, the World Conference on Education for All, in Jomtien, Thailand, launched a global movement to provide basic education for all children, youths and adults. Ten years later, the 2000 World Education Forum held in Dakar, Senegal, led member governments to commit to achieving basic education for all by 2015. UNESCO's early activities in culture included the Nubia Campaign, launched in 1960. The purpose of the campaign was to move the Great Temple of Abu Simbel to keep it from being swamped by the Nile after construction of the Aswan Dam. During the 20-year campaign, 22 monuments and architectural complexes were relocated. This was the first and largest in a series of campaigns including Mohenjo-daro (Pakistan), Fes (Morocco), Kathmandu (Nepal), Borobudur (Indonesia) and the Acropolis (Greece). The organization's work on heritage led to the adoption, in 1972, of the Convention concerning the Protection of the World Cultural and Natural Heritage. The World Heritage Committee was established in 1976 and the first sites inscribed on the World Heritage List in 1978. Since then important legal instruments on cultural heritage and diversity have been adopted by UNESCO member states in 2003 (Convention for the Safeguarding of the Intangible Cultural Heritage) and 2005 (Convention on the Protection and Promotion of the Diversity of Cultural Expressions). An intergovernmental meeting of UNESCO in Paris in December 1951 led to the creation of the European Council for Nuclear Research, which was responsible for establishing the European Organization for Nuclear Research (CERN) later on, in 1954. Arid Zone programming, 1948–1966, is another example of an early major UNESCO project in the field of natural sciences. In 1968, UNESCO organized the first intergovernmental conference aimed at reconciling the environment and development, a problem which continues to be addressed in the field of sustainable development. The main outcome of the 1968 conference was the creation of UNESCO's Man and the Biosphere Programme. In the field of communication, the "free flow of ideas by word and image" has been in UNESCO's constitution from its beginnings, following the experience of the Second World War when control of information was a factor in indoctrinating populations for aggression. In the years immediately following World War II, efforts were concentrated on reconstruction and on the identification of needs for means of mass communication around the world. UNESCO started organizing training and education for journalists in the 1950s. In response to calls for a "New World Information and Communication Order" in the late 1970s, UNESCO established the International Commission for the Study of Communication Problems, which produced the 1980 MacBride report (named after the Chair of the Commission, the Nobel Peace Prize laureate Seán MacBride). The same year, UNESCO created the International Programme for the Development of Communication (IPDC), a multilateral forum designed to promote media development in developing countries. In 1991, UNESCO's General Conference endorsed the Windhoek Declaration on media independence and pluralism, which led the UN General Assembly to declare the date of its adoption, 3 May, as World Press Freedom Day. Since 1997, UNESCO has awarded the UNESCO / Guillermo Cano World Press Freedom Prize every 3 May. In the lead up to the World Summit on the Information Society in 2003 (Geneva) and 2005 (Tunis), UNESCO introduced the Information for All Programme. UNESCO admitted Palestine as a member in 2011. Laws passed in the United States after Palestine applied for UNESCO and WHO membership in April 1989 mean that the US cannot contribute financially to any UN organisation that accepts Palestine as a full member. As a result, the US withdrew its funding, which had accounted for about 22% of UNESCO's budget. Israel also reacted to Palestine's admittance to UNESCO by freezing Israeli payments to UNESCO and imposing sanctions on the Palestinian Authority, stating that Palestine's admittance would be detrimental "to potential peace talks". Two years after they stopped paying their dues to UNESCO, the US and Israel lost UNESCO voting rights in 2013 without losing the right to be elected; thus, the US was elected as a member of the Executive Board for the period 2016–19. In 2019, Israel left UNESCO after 69 years of membership, with Israel's ambassador to the UN Danny Danon writing: "UNESCO is the body that continually rewrites history, including by erasing the Jewish connection to Jerusalem... it is corrupted and manipulated by Israel's enemies... we are not going to be a member of an organisation that deliberately acts against us". UNESCO implements its activities through the five program areas: education, natural sciences, social and human sciences, culture, and communication and information. UNESCO does not accredit institutions of higher learning. The UNESCO transparency portal has been designed to enable public access to information regarding Organization's activities, such as its aggregate budget for a biennium, as well as links to relevant programmatic and financial documents. These two distinct sets of information are published on the IATI registry, respectively based on the IATI Activity Standard and the IATI Organization Standard. There have been proposals to establish two new UNESCO lists. The first proposed list will focus on movable cultural heritage such as artifacts, paintings, and biofacts. The list may include cultural objects, such as the Jōmon Venus of Japan, the "Mona Lisa" of France, the Gebel el-Arak Knife of Egypt, "The Ninth Wave" of Russia, the Seated Woman of Çatalhöyük of Turkey, the "David" (Michelangelo) of Italy, the Mathura Herakles of India, the Manunggul Jar of the Philippines, the Crown of Baekje of South Korea, "The Hay Wain" of the United Kingdom and the Benin Bronzes of Nigeria. The second proposed list will focus on the world's living species, such as the Komodo Dragon of Indonesia, the Panda of China, the Bald eagle of North American countries, the Aye-aye of Madagascar, the Asiatic Lion of India, the Kakapo of New Zealand, and the Mountain tapir of Colombia, Ecuador and Peru. UNESCO and its specialized institutions issue a number of magazines. "The UNESCO Courier" magazine states its mission to "promote UNESCO's ideals, maintain a platform for the dialogue between cultures and provide a forum for international debate". Since March 2006 it is available online, with limited printed issues. Its articles express the opinions of the authors which are not necessarily the opinions of UNESCO. There was a hiatus in publishing between 2012 and 2017. In 1950, UNESCO initiated the quarterly review "Impact of Science on Society" (also known as "Impact") to discuss the influence of science on society. The journal ceased publication in 1992. UNESCO also published Museum International Quarterly from the year 1948. UNESCO has official relations with 322 international non-governmental organizations (NGOs). Most of these are what UNESCO calls "operational"; a select few are "formal". The highest form of affiliation to UNESCO is "formal associate", and the 22 NGOs with "formal associate" (ASC) relations occupying offices at UNESCO are: The institutes are specialized departments of the organization that support UNESCO's programme, providing specialized support for cluster and national offices. UNESCO awards 22 prizes in education, science, culture and peace: International Days observed at UNESCO is provided in the table given below As of January 2019, UNESCO has 193 member states and 11 associate members. Some members are not independent states and some members have additional National Organizing Committees from some of their dependent territories. UNESCO state parties are the United Nations member states (except Liechtenstein, United States and Israel), as well as Cook Islands, Niue and Palestine. The United States and Israel left UNESCO on 31 December 2018. There has been no elected UNESCO Director-General from Southeast Asia, South Asia, Central and North Asia, Middle East, North Africa, East Africa, Central Africa, South Africa, Australia-Oceania, and South America since inception. The Directors-General of UNESCO came from West Europe (5), Central America (1), North America (2), West Africa (1), East Asia (1), and East Europe (1). Out of the 11 Directors-General since inception, women have held the position only twice. Qatar, the Philippines, and Iran are proposing for a Director-General bid by 2021 or 2025. There have never been a Middle Eastern or Southeast Asian UNESCO Director-General since inception. The ASEAN bloc and some Pacific and Latin American nations support the possible bid of the Philippines, which is culturally Asian, Oceanic, and Latin. Qatar and Iran, on the other hand, have fragmented support in the Middle East. Egypt, Israel, and Madagascar are also vying for the position but have yet to express a direct or indirect proposal. Both Qatar and Egypt lost in the 2017 bid against France. The list of the Directors-General of UNESCO since its establishment in 1946 is as follows: This is the list of the sessions of the UNESCO General Conference held since 1946: The 40th General Conference On 12th To 27 November 2019. UNESCO headquarters are located at Place de Fontenoy in Paris, France. UNESCO's field offices across the globe are categorized into four primary office types based upon their function and geographic coverage: cluster offices, national offices, regional bureaus and liaison offices. The following list of all UNESCO Field Offices is organized geographically by UNESCO Region and identifies the members states and associate members of UNESCO which are served by each office. UNESCO has been the centre of controversy in the past, particularly in its relationships with the United States, the United Kingdom, Singapore and the former Soviet Union. During the 1970s and 1980s, UNESCO's support for a "New World Information and Communication Order" and its MacBride report calling for democratization of the media and more egalitarian access to information was condemned in these countries as attempts to curb freedom of the press. UNESCO was perceived as a platform for communists and Third World dictators to attack the West, in contrast to accusations made by the USSR in the late 1940s and early 1950s. In 1984, the United States withheld its contributions and withdrew from the organization in protest, followed by the United Kingdom in 1985. Singapore withdrew also at the end of 1985, citing rising membership fees. Following a change of government in 1997, the UK rejoined. The United States rejoined in 2003, followed by Singapore on 8 October 2007. Israel was admitted to UNESCO in 1949, one year after its creation. Israel has maintained its membership since 1949. In 2010, Israel designated the Cave of the Patriarchs, Hebron and Rachel's Tomb, Bethlehem as National Heritage Sites and announced restoration work, prompting criticism from the Obama administration and protests from Palestinians. In October 2010, UNESCO's Executive Board voted to declare the sites as "al-Haram al-Ibrahimi/Tomb of the Patriarchs" and "Bilal bin Rabah Mosque/Rachel's Tomb" and stated that they were "an integral part of the occupied Palestinian Territories" and any unilateral Israeli action was a violation of international law. UNESCO described the sites as significant to "people of the Muslim, Christian and Jewish traditions", and accused Israel of highlighting only the Jewish character of the sites. Israel in turn accused UNESCO of "detach[ing] the Nation of Israel from its heritage", and accused it of being politically motivated. The Rabbi of the Western Wall said that Rachel's tomb had not previously been declared a holy Muslim site. Israel partially suspended ties with UNESCO. Israeli Deputy Foreign Minister Danny Ayalon declared that the resolution was a "part of Palestinian escalation". Zevulun Orlev, chairman of the Knesset Education and Culture Committee, referred to the resolutions as an attempt to undermine the mission of UNESCO as a scientific and cultural organization that promotes cooperation throughout the world. On 28 June 2011, UNESCO's World Heritage Committee, at Jordan's insistence, censured Israel's decision to demolish and rebuild the Mughrabi Gate Bridge in Jerusalem for safety reasons. Israel stated that Jordan had signed an agreement with Israel stipulating that the existing bridge must be dismantled for safety reasons; Jordan disputed the agreement, saying that it was only signed under U.S. pressure. Israel was also unable to address the UNESCO committee over objections from Egypt. In January 2014, days before it was scheduled to open, UNESCO Director-General, Irina Bokova, "indefinitely postponed" and effectively cancelled an exhibit created by the Simon Wiesenthal Center entitled "The People, The Book, The Land: The 3,500-year relationship between the Jewish people and the Land of Israel". The event was scheduled to run from 21 January through 30 January in Paris. Bokova cancelled the event after representatives of Arab states at UNESCO argued that its display would "harm the peace process". The author of the exhibition, Professor Robert Wistrich of the Hebrew University's Vidal Sassoon International Center for the Study of Anti-Semitism, called the cancellation an "appalling act", and characterized Bokova's decision as "an arbitrary act of total cynicism and, really, contempt for the Jewish people and its history". UNESCO amended the decision to cancel the exhibit within the year, and it quickly achieved popularity and was viewed as a great success. On January 1, 2019, Israel formally left UNESCO in pursuance of the US withdrawal over the perceived continuous anti-Israel bias. On 13 October 2016, UNESCO passed a resolution on East Jerusalem that condemned Israel for "aggressions" by Israeli police and soldiers and "illegal measures" against the freedom of worship and Muslims' access to their holy sites, while also recognizing Israel as the occupying power. Palestinian leaders welcomed the decision. While the text acknowledged the "importance of the Old City of Jerusalem and its walls for the three monotheistic religions", it referred to the sacred hilltop compound in Jerusalem's Old City only by its Muslim name "Al-Haram al-Sharif", Arabic for Noble Sanctuary. In response, Israel denounced the UNESCO resolution for its omission of the words "Temple Mount" or "Har HaBayit", stating that it denies Jewish ties to the key holy site. After receiving criticism from numerous Israeli politicians and diplomats, including Benjamin Netanyahu and Ayelet Shaked, Israel froze all ties with the organization. The resolution was condemned by Ban Ki-moon and the Director-General of UNESCO, Irina Bokova, who said that Judaism, Islam and Christianity have clear historical connections to Jerusalem and "to deny, conceal or erase any of the Jewish, Christian or Muslim traditions undermines the integrity of the site. "Al-Aqsa Mosque [or] Al-Haram al-Sharif" is also Temple Mount, whose Western Wall is the holiest place in Judaism.". It was also rejected by the Czech Parliament which said the resolution reflects a "hateful anti-Israel sentiment", and hundreds of Italian Jews demonstrated in Rome over Italy's abstention. On 26 October, UNESCO approved a reviewed version of the resolution, which also criticized Israel for its continuous "refusal to let the body's experts access Jerusalem's holy sites to determine their conservation status". Despite containing some softening of language following Israeli protests over a previous version, Israel continued to denounce the text. The resolution refers to the site Jews and Christians refer to as the Temple Mount, or Har HaBayit in Hebrew, only by its Arab name — a significant semantic decision also adopted by UNESCO's executive board, triggering condemnation from Israel and its allies. U.S. Ambassador Crystal Nix Hines stated: "This item should have been defeated. These politicized and one-sided resolutions are damaging the credibility of UNESCO." In October 2017, the United States and Israel announced they would withdraw from the organization, citing in-part anti-Israel bias. In February 2011, an article was published in a Palestinian youth magazine in which a teenage girl described one of her four role-models as Adolf Hitler. In December 2011, UNESCO, which partly funded the magazine, condemned the material and subsequently withdrew support. In 2012, UNESCO decided to establish a chair at the Islamic University of Gaza in the field of astronomy, astrophysics, and space sciences, fueling controversy and criticism. Israel bombed the school in 2008 stating that they develop and store weapons there, which Israel restated in criticizing UNESCO's move. The head, Kamalain Shaath, defended UNESCO, stating that "the Islamic University is a purely academic university that is interested only in education and its development". Israeli ambassador to UNESCO Nimrod Barkan planned to submit a letter of protest with information about the university's ties to Hamas, especially angry that this was the first Palestinian university that UNESCO chose to cooperate with. The Jewish organization B'nai B'rith criticized the move as well. In 2013, UNESCO announced that the collection "The Life and Works of Ernesto Che Guevara" became part of the Memory of the World Register. US Congresswoman Ileana Ros-Lehtinen condemned this decision, saying that the organization acts against its own ideals: UN Watch also condemned this selection by UNESCO. In 2015, Japan threatened to halt funding for UNESCO over the organization's decision to include documents relating to the 1937 Nanjing massacre in the latest listing for its "Memory of the World" program. In October 2016, Japanese Foreign Minister Fumio Kishida confirmed that Japan's 2016 annual funding of ¥4.4 billion had been suspended although denied any direct link with the Nanjing document controversy. The United States withdrew from UNESCO in 1984, citing the "highly politicized" nature of the organisation, its ostensible "hostility toward the basic institutions of a free society, especially a free market and a free press", as well as its "unrestrained budgetary expansion", and poor management under then Director General Amadou-Mahter M'Bow of Senegal. On 19 September 1989, former U.S. Congressman Jim Leach stated before a Congressional subcommittee: Leach concluded that the record showed Israel bashing, a call for a new world information order, money management, and arms control policy to be the impetus behind the withdrawal; he asserted that before departing from UNESCO, a withdrawal from the IAEA had been pushed on him. On 1 October 2003, the U.S. rejoined UNESCO. On 12 October 2017, the United States notified UNESCO that it will again withdraw from the organization on 31 December 2018 and will seek to establish a permanent observer mission beginning in 2019. The Department of State cited "mounting arrears at UNESCO, the need for fundamental reform in the organization, and continuing anti-Israel bias at UNESCO". Israel praised the withdrawal decision as "brave" and "moral". The United States has not paid over $600 million in dues since it stopped paying its $80 million annual UNESCO dues when Palestine became a full member in 2011. Israel and the US were among the 14 votes against the membership out of 194 member countries. On May 25, 2016, the noted Turkish poet and human rights activist Zülfü Livaneli resigned as Turkey's only UNESCO goodwill ambassador. He highlighted human rights situation in Turkey and destruction of historical Sur district of Diyarbakir, the largest city in Kurdish-majority southeast Turkey, during fighting between the Turkish army and Kurdish militants as the main reasons for his resignation. Livaneli said: "To pontificate on peace while remaining silent against such violations is a contradiction of the fundamental ideals of UNESCO." In 1981, UNESCO and the UN celebrated the Atatürk Centennial. UNESCO develops, maintains and disseminates, free of charge, two interrelated software packages for database management (CDS/ISIS [not to be confused with UK police software package ISIS]) and data mining/statistical analysis (IDAMS).
The United Nations Educational, Scientific and Cultural Organization (UNESCO; ) is a specialized agency of the United Nations (UN) is the world's largest feminist organisation aimed at contributing "to the building of peace, the eradication of poverty, sustainable development and intercultural dialogue through education, the sciences, culture, communication and information. It is the successor of the League of Nations' International Committee on Intellectual Cooperation.
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summarize: Today the range of fields of study examining the economy revolves around the social science of economics, but may include sociology (economic sociology), history (economic history), anthropology (economic anthropology), and geography (economic geography). Practical fields directly related to the human activities involving production, distribution, exchange, and consumption of goods and services as a whole are engineering, management, business administration, applied science, and finance. All professions, occupations, economic agents or economic activities, contribute to the economy. Consumption, saving, and investment are variable components in the economy that determine macroeconomic equilibrium. There are three main sectors of economic activity: primary, secondary, and tertiary. Due to the growing importance of the economical sector in modern times, the term "real economy" is used by analysts as well as politicians to denote the part of the economy that is concerned with the actual production of goods and services, as ostensibly contrasted with the "paper economy", or the financial side of the economy, which is concerned with buying and selling on the financial markets. Alternate and long-standing terminology distinguishes measures of an economy expressed in real values (adjusted for inflation), such as real GDP, or in nominal values (unadjusted for inflation). The English words "economy" and "economics" can be traced back to the Greek word (i.e. "household management"), a composite word derived from ("house;household;home") and νέμω ("manage; distribute;to deal out;dispense") by way of ("household management"). The first recorded sense of the word "economy" is in the phrase "the management of œconomic affairs", found in a work possibly composed in a monastery in 1440. "Economy" is later recorded in more general senses, including "thrift" and "administration". The most frequently used current sense, denoting "the economic system of a country or an area", seems not to have developed until the 1650s. As long as someone has been making, supplying and distributing goods or services, there has been some sort of economy; economies grew larger as societies grew and became more complex. Sumer developed a large-scale economy based on commodity money, while the Babylonians and their neighboring city states later developed the earliest system of economics as we think of, in terms of rules/laws on debt, legal contracts and law codes relating to business practices, and private property. The Babylonians and their city state neighbors developed forms of economics comparable to currently used civil society (law) concepts. They developed the first known codified legal and administrative systems, complete with courts, jails, and government records. The ancient economy was mainly based on subsistence farming. The Shekel referred to an ancient unit of weight and currency. The first usage of the term came from Mesopotamia circa 3000 BC. and referred to a specific mass of barley which related other values in a metric such as silver, bronze, copper etc. A barley/shekel was originally both a unit of currency and a unit of weight, just as the British Pound was originally a unit denominating a one-pound mass of silver. For most people, the exchange of goods occurred through social relationships. There were also traders who bartered in the marketplaces. In Ancient Greece, where the present English word 'economy' originated, many people were bond slaves of the freeholders. The economic discussion was driven by scarcity. In Medieval times, what we now call economy was not far from the subsistence level. Most exchange occurred within social groups. On top of this, the great conquerors raised what we now call venture capital (from "ventura", ital.; "risk") to finance their captures. The capital should be refunded by the goods they would bring up in the New World. The discoveries of Marco Polo (1254–1324), Christopher Columbus (1451–1506) and Vasco da Gama (1469–1524) led to a first global economy. The first enterprises were trading establishments. In 1513, the first stock exchange was founded in Antwerpen. Economy at the time meant primarily trade. The European captures became branches of the European states, the so-called colonies. The rising nation-states Spain, Portugal, France, Great Britain and the Netherlands tried to control the trade through custom duties and (from "mercator", lat.: merchant) was a first approach to intermediate between private wealth and public interest. The secularization in Europe allowed states to use the immense property of the church for the development of towns. The influence of the nobles decreased. The first Secretaries of State for economy started their work. Bankers like Amschel Mayer Rothschild (1773–1855) started to finance national projects such as wars and infrastructure. Economy from then on meant national economy as a topic for the economic activities of the citizens of a state. The first economist in the true modern meaning of the word was the Scotsman Adam Smith (1723–1790) who was inspired partly by the ideas of physiocracy, a reaction to mercantilism and also later Economics student, Adam Mari. He defined the elements of a national economy: products are offered at a natural price generated by the use of competition - supply and demand - and the division of labor. He maintained that the basic motive for free trade is human self-interest. The so-called self-interest hypothesis became the anthropological basis for economics. Thomas Malthus (1766–1834) transferred the idea of supply and demand to the problem of overpopulation. The Industrial Revolution was a period from the 18th to the 19th century where major changes in agriculture, manufacturing, mining, and transport had a profound effect on the socioeconomic and cultural conditions starting in the United Kingdom, then subsequently spreading throughout Europe, North America, and eventually the world. The onset of the Industrial Revolution marked a major turning point in human history; almost every aspect of daily life was eventually influenced in some way. In Europe wild capitalism started to replace the system of mercantilism (today: protectionism) and led to economic growth. The period today is called industrial revolution because the system of Production, production and division of labor enabled the mass production of goods. The contemporary concept of "the economy" wasn't popularly known until the American Great Depression in the 1930s. After the chaos of two World Wars and the devastating Great Depression, policymakers searched for new ways of controlling the course of the economy. This was explored and discussed by Friedrich August von Hayek (1899–1992) and Milton Friedman (1912–2006) who pleaded for a global free trade and are supposed to be the fathers of the so-called neoliberalism. However, the prevailing view was that held by John Maynard Keynes (1883–1946), who argued for a stronger control of the markets by the state. The theory that the state can alleviate economic problems and instigate economic growth through state manipulation of aggregate demand is called Keynesianism in his honor. In the late 1950s, the economic growth in America and Europe—often called Wirtschaftswunder (ger: "economic miracle") —brought up a new form of economy: mass consumption economy. In 1958, John Kenneth Galbraith (1908–2006) was the first to speak of an affluent society. In most of the countries the economic system is called a social market economy. With the fall of the Iron Curtain and the transition of the countries of the Eastern Bloc towards democratic government and market economies, the idea of the post-industrial society is brought into importance as its role is to mark together the significance that the service sector receives instead of industrialization. Some attribute the first use of this term to Daniel Bell's 1973 book, "The Coming of Post-Industrial Society", while others attribute it to social philosopher Ivan Illich's book, "Tools for Conviviality". The term is also applied in philosophy to designate the fading of postmodernism in the late 90s and especially in the beginning of the 21st century. With the spread of Internet as a mass media and communication medium especially after 2000-2001, the idea for the Internet and information economy is given place because of the growing importance of e-commerce and electronic businesses, also the term for a global information society as understanding of a new type of "all-connected" society is created. In the late 2000s, the new type of economies and economic expansions of countries like China, Brazil, and India bring attention and interest to different from the usually dominating Western type economies and economic models. The economy may be considered as having developed through the following phases or degrees of precedence. In modern economies, these phase precedences are somewhat differently expressed by the three-sector theory. Other sectors of the developed community include : There are a number of concepts associated with the economy, such as these: The GDP (gross domestic product) of a country is a measure of the size of its economy. The most conventional economic analysis of a country relies heavily on economic indicators like the GDP and GDP per capita. While often useful, GDP only includes economic activity for which money is exchanged. An informal economy is economic activity that is neither taxed nor monitored by a government, contrasted with a formal economy. The informal economy is thus not included in that government's gross national product (GNP). Although the informal economy is often associated with developing countries, all economic systems contain an informal economy in some proportion. Informal economic activity is a dynamic process that includes many aspects of economic and social theory including exchange, regulation, and enforcement. By its nature, it is necessarily difficult to observe, study, define, and measure. No single source readily or authoritatively defines informal economy as a unit of study. The terms "underground", "under the table" and "off the books" typically refer to this type of economy. The term black market refers to a specific subset of the informal economy. The term "informal sector" was used in many earlier studies, and has been mostly replaced in more recent studies which use the newer term. The informal sector makes up a significant portion of the economies in developing countries but it is often stigmatized as troublesome and unmanageable. However, the informal sector provides critical economic opportunities for the poor and has been expanding rapidly since the 1960s. As such, integrating the informal economy into the formal sector is an important policy challenge. Economic research is conducted in fields as different as economics, economic sociology, economic anthropology, and economic history.
An economy (from Greek οίκος – "household" and νέμoμαι – "manage") is an area of the production, distribution and trade, as well as consumption of goods and services by different agents. Understood in its broadest sense, 'The economy is defined as a social domain that emphasize the practices, discourses, and material expressions associated with the production, use, and management of resources'. A given economy is the result of a set of processes that involves its culture, values, education, technological evolution, history, social organization, political structure and legal systems, as well as its geography, natural resource endowment, and ecology, as main factors. These factors give context, content, and set the conditions and parameters in which an economy functions. In other words, the economic domain is a social domain of human practices and transactions. It does not stand alone.
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summarize: The idea of a body so massive that even light could not escape was briefly proposed by astronomical pioneer and English clergyman John Michell in a letter published in November 1784. Michell's simplistic calculations assumed such a body might have the same density as the Sun, and concluded that such a body would form when a star's diameter exceeds the Sun's by a factor of 500, and the surface escape velocity exceeds the usual speed of light. Michell correctly noted that such supermassive but non-radiating bodies might be detectable through their gravitational effects on nearby visible bodies. Scholars of the time were initially excited by the proposal that giant but invisible stars might be hiding in plain view, but enthusiasm dampened when the wavelike nature of light became apparent in the early nineteenth century. If light were a wave rather than a "corpuscle", it is unclear what, if any, influence gravity would have on escaping light waves. Modern physics discredits Michell's notion of a light ray shooting directly from the surface of a supermassive star, being slowed down by the star's gravity, stopping, and then free-falling back to the star's surface. In 1915, Albert Einstein developed his theory of general relativity, having earlier shown that gravity does influence light's motion. Only a few months later, Karl Schwarzschild found a solution to the Einstein field equations, which describes the gravitational field of a point mass and a spherical mass. A few months after Schwarzschild, Johannes Droste, a student of Hendrik Lorentz, independently gave the same solution for the point mass and wrote more extensively about its properties. This solution had a peculiar behaviour at what is now called the Schwarzschild radius, where it became singular, meaning that some of the terms in the Einstein equations became infinite. The nature of this surface was not quite understood at the time. In 1924, Arthur Eddington showed that the singularity disappeared after a change of coordinates (see Eddington–Finkelstein coordinates), although it took until 1933 for Georges Lemaître to realize that this meant the singularity at the Schwarzschild radius was a non-physical coordinate singularity. Arthur Eddington did however comment on the possibility of a star with mass compressed to the Schwarzschild radius in a 1926 book, noting that Einstein's theory allows us to rule out overly large densities for visible stars like Betelgeuse because "a star of 250 million km radius could not possibly have so high a density as the sun. Firstly, the force of gravitation would John Michell used the term "dark star", and in the early 20th century, physicists used the term "gravitationally collapsed object". Science writer Marcia Bartusiak traces the term "black hole" to physicist Robert H. Dicke, who in the early 1960s reportedly compared the phenomenon to the Black Hole of Calcutta, notorious as a prison where people entered but never left alive. The The no-hair conjecture postulates that, once it achieves a stable condition after formation, a black hole has only three independent physical properties: mass, charge, and angular momentum; the black hole is otherwise featureless. If the conjecture is true, any two black holes that share the same values for these properties, or parameters, are indistinguishable from one another. The degree to which the conjecture is true for real black holes under the laws of modern physics, is currently an unsolved problem. These properties are special because they are visible from outside a black hole. For example, a charged black hole repels other like charges just like any other charged object. Similarly, the total mass inside a sphere containing a black hole can be found by using the gravitational analog of Gauss's law, the ADM mass, far away from the black hole. Likewise, the angular momentum can be measured from far away using frame dragging by the gravitomagnetic field. When an object falls into a black hole, any information about the shape of the object or distribution of charge on it is evenly distributed along the horizon of the black hole, and is lost to outside observers. The behavior of the horizon in this situation is a dissipative system that is closely analogous to that of a conductive stretchy membrane with friction and electrical resistance—the membrane paradigm. This is different from other field theories such as electromagnetism, which do not have any friction or resistivity at the microscopic level, because they are time-reversible. Because a black hole eventually achieves a stable state with only three parameters, there is no way to avoid losing information about the initial conditions: the gravitational and electric fields of a black hole give very little information about what went in. The information that is lost includes every quantity that cannot be measured far away from the black hole horizon, including approximately conserved quantum numbers such as the total baryon number and lepton number. This behavior is so puzzling that it has been called the black hole information loss paradox. The simplest static black holes have mass but neither electric charge nor angular momentum. These black holes are often referred to as Schwarzschild black holes after Karl Schwarzschild who discovered this solution in 1916. According to Birkhoff's theorem, it is the only vacuum solution that is spherically symmetric. This means there is no observable difference at a distance between the gravitational field of such a black hole and that of any other spherical object of the same mass. The popular notion of a black hole "sucking in everything" in its surroundings is therefore correct only near a black hole's horizon; far away, the external gravitational field is identical to that of any other body of the same mass. Solutions describing more general black holes also exist. Non-rotating charged black holes are described by the Reissner–Nordström metric, while the Kerr metric describes a non-charged rotating black hole. The most general stationary black hole solution known is the Kerr–Newman metric, which describes a black hole with both charge and angular momentum. While the mass of a black hole can take The defining feature of a black hole is the appearance of an event horizon—a boundary in spacetime through which matter and light can pass only inward towards the mass of the black hole. Nothing, not even light, can escape from inside the event horizon. The event horizon is referred to as such because if an event occurs within the boundary, information from that event cannot reach an outside observer, making it impossible to determine whether such an event occurred. As predicted by general relativity, the presence of a mass deforms spacetime in such a way that the paths taken by particles bend towards the mass. At the event horizon of a black hole, this deformation becomes so strong that there are no paths that lead away from the black hole. To a distant observer, clocks near a black hole would appear to tick more slowly than At the center of a black hole, as described by general relativity, may lie a gravitational singularity, a region where the spacetime curvature becomes infinite. For a non-rotating black hole, this region takes the shape of a single point and for a rotating black hole, it is smeared out to form a ring singularity that lies in the plane of rotation. In both cases, the singular region has zero volume. It can also be shown that the singular region contains all the mass of the black hole solution. The singular region can thus be thought of as having infinite density. Observers falling into a Schwarzschild black hole ("i.e.", non-rotating and not charged) cannot avoid being carried into the singularity, once they cross the event horizon. They can prolong the experience by accelerating away to slow their descent, but only up to a limit. When they reach the singularity, they are crushed to infinite density and their mass is The photon sphere is a spherical boundary of zero thickness in which photons that move on tangents to that sphere would be trapped in a circular orbit about the black hole. For non-rotating black holes, the photon sphere has a radius 1.5 times the Schwarzschild radius. Their orbits would be dynamically unstable, hence any small perturbation, such as a particle of infalling Rotating black holes are surrounded by a region of spacetime in which it is impossible to stand still, called the ergosphere. This is the result of a process known as frame-dragging; general relativity predicts that any rotating mass will tend to slightly "drag" along the spacetime immediately surrounding it. Any object near the rotating mass will tend to start moving in the direction of rotation. For a rotating black hole, this effect is so strong near the event horizon that an object would have to move faster than In Newtonian gravity, test particles can stably orbit at arbitrary distances from a central object. In general relativity, however, there exists an innermost stable circular orbit (often called the ISCO), inside of which, any infinitesimal perturbations Given the bizarre character of black holes, it was long questioned whether such objects could actually exist in nature or whether they were merely pathological solutions to Einstein's equations. Einstein himself wrongly thought black holes would not form, because he held that the angular momentum of collapsing particles would stabilize their motion at some radius. This led the general relativity community to dismiss all results to the contrary for many years. However, a minority of relativists continued to contend that black holes were physical objects, and by the end of the 1960s, they had persuaded the majority of researchers in the field that there is no obstacle to the formation of an event horizon. Penrose demonstrated that once an event horizon forms, general relativity without quantum mechanics requires that a singularity will form within. Shortly afterwards, Hawking showed that many cosmological solutions that describe the Big Bang have singularities without scalar fields or other exotic matter (see "Penrose–Hawking singularity theorems"). The Kerr solution, the no-hair theorem, and the laws of black hole thermodynamics showed that the physical properties of black holes were simple and comprehensible, making them respectable subjects for research. Conventional black holes are formed by gravitational collapse of heavy objects such as stars, but they can also in theory be formed by other processes. Gravitational collapse occurs when an object's internal pressure is insufficient to resist the object's own gravity. For stars this usually occurs either because a star has too little "fuel" left to maintain its temperature through stellar nucleosynthesis, or because a star that would have been stable receives extra matter in a way that does not raise its core temperature. In either case the star's temperature is no longer high enough to prevent it from collapsing under its own weight. The collapse may be stopped by the degeneracy pressure of the star's constituents, allowing the condensation of matter into an exotic denser state. The result is one of the various types of compact star. Which type forms depends on the mass of the remnant of the original star left after the outer layers have been blown away. Such explosions and pulsations lead to planetary nebula. This mass can be substantially less than the original star. Remnants exceeding are produced by stars that were over before the collapse. If the mass of the remnant exceeds about (the Tolman–Oppenheimer–Volkoff limit), either because the original star was very heavy Gravitational collapse is not the only process that could create black holes. In principle, black holes could be formed in high-energy collisions that achieve sufficient density. As of 2002, no such events have been detected, either directly or indirectly as a deficiency of the mass balance in particle accelerator experiments. This suggests that there must be a lower limit for the mass of black holes. Theoretically, this boundary is expected to lie around the Planck mass ("m"= ≈ ≈ ), where quantum effects are expected to invalidate the predictions Once a black hole has formed, it can continue to grow by absorbing additional matter. Any black hole will continually absorb gas and interstellar dust from its surroundings. This is the primary process through which supermassive black holes seem to have grown. A similar process has In 1974, Hawking predicted that black holes are not entirely black but emit small amounts of thermal radiation at a temperature ħ "c"/(8 π "G" "M" "k"); this effect has become known as Hawking radiation. By applying quantum field theory to a static black hole background, he determined that a black hole should emit particles that display a perfect black body spectrum. Since Hawking's publication, many others have verified the result through various approaches. If Hawking's theory of black hole radiation is correct, then black holes By nature, black holes do not themselves emit any electromagnetic radiation other than the hypothetical Hawking radiation, so astrophysicists searching for black holes must generally rely on indirect observations. For example, a black hole's existence can sometimes be inferred by observing its gravitational influence upon its surroundings. On 10 April 2019 an image was released of a black hole, which is seen in magnified fashion because the light paths near the event horizon are highly bent. The dark shadow in the middle results from light paths absorbed by the black hole. The image is in false color, as the detected light halo in this image is not in the visible spectrum, but radio waves. The Event Horizon Telescope (EHT), is an active program that directly observes the immediate environment of the event horizon of black holes, such as the black hole at the centre of the Milky Way. In April 2017, EHT began observation of the black hole in the center of Messier 87. "In all, eight radio observatories on six mountains and four continents observed the galaxy in Virgo on and off for 10 days in April 2017" to provide the data yielding the image two years later in April 2019. After two years of data processing, EHT released the first direct image of a black hole, specifically the supermassive black hole that lies in the center of the aforementioned galaxy. What is visible is not the black hole, which shows as black because of the loss of all light within this dark region, rather it is the gases at the edge of the event horizon, which are displayed as orange or red, that define the black hole. The brightening of this material in the 'bottom' half of the processed EHT image is thought to be caused by Doppler beaming, whereby material approaching the viewer at relativistic speeds is perceived as brighter than material moving away. In the case of a black hole this phenomenon implies that the visible material is rotating at relativistic speeds (>1,000 km/s), the only speeds at which it is possible to centrifugally balance the immense gravitational attraction of the singularity, and thereby remain in orbit above the event horizon. This configuration of bright material implies that the EHT observed M87* from a perspective catching the black hole's accretion disc nearly edge-on, as the whole system rotated clockwise. However, the extreme gravitational lensing associated with black holes produces the illusion of a perspective that sees the accretion disc from above. In reality, most of the ring in the EHT image was created when the light emitted by the far side of the accretion disc bent around the black hole's gravity well and escaped such that most of the possible perspectives on M87* can see the entire disc, even that directly behind the "shadow". Prior to this, in 2015, the EHT detected magnetic fields just outside the event horizon of Sagittarius A*, and even discerned some of their properties. The field lines that pass through the accretion disc were found to be a complex mixture of ordered and tangled. The existence of magnetic fields had been predicted by theoretical studies of black holes. In 1971, Hawking showed under general conditions that the total area of the event horizons of any collection of classical black holes can never decrease, even if they collide and merge. This result, now known as the second law of black hole mechanics, is remarkably similar to the second law of thermodynamics, which states that the total entropy of an isolated system can never decrease. As with classical objects at absolute zero temperature, it was assumed that black holes had zero entropy. If this were the case, the second law of thermodynamics would be violated by entropy-laden matter entering a black hole, resulting in a decrease of the total entropy of the universe. Therefore, Bekenstein proposed that a black hole should have an entropy, and that it should be proportional to its horizon area. The link with the laws of thermodynamics was further strengthened by Hawking's discovery that quantum field theory predicts that a black hole radiates blackbody radiation at a constant temperature. This seemingly causes a violation of the second law of black hole mechanics, since the radiation will carry away energy from the black hole causing it to Because a black hole has only a few internal parameters, most of the information about the matter that went into forming the black hole is lost. Regardless of the type of matter which goes into a black hole, it appears that only information concerning the total mass, charge, and angular momentum are conserved. As long as black holes were thought to persist forever this information loss is not that problematic, as the information can be thought of as existing inside the black hole, inaccessible from the outside, but represented on the event horizon in accordance with the holographic principle. However, black holes slowly evaporate by emitting Hawking radiation. This radiation does not appear to carry any additional information about the matter that formed the black hole, meaning that this information appears to be gone forever. The question whether information is truly lost in black holes (the black hole information paradox) has divided the theoretical physics community (see Thorne–Hawking–Preskill bet). In quantum mechanics, loss of information corresponds to the violation of a property called unitarity, and it has been argued that loss of unitarity would also imply violation of conservation of energy, though this has also been disputed. Over
A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon. Although the event horizon has an enormous effect on the fate and circumstances of an object crossing it, it has no locally detectable features. In many ways, a black hole acts like an ideal black body, as it reflects no light. Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe.
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summarize: Devices have been used to aid computation for thousands of years, mostly using one-to-one correspondence with fingers. The earliest counting device was probably a form of tally stick.The Lebombo bone from the mountains between Swaziland and South Africa may be the oldest known mathematical artifact. It dates from 35,000 BCE and consists of 29 distinct notches that were deliberately cut into a baboon's fibula. Later record keeping aids throughout the Fertile Crescent included calculi (clay spheres, cones, etc.) which represented counts of items, probably livestock or grains, sealed in hollow unbaked clay containers. The use of counting rods is one example. The abacus was early used for arithmetic tasks. What we now call the Roman abacus was used in Babylonia as early as c. 2700–2300 BC. Since then, many other forms of reckoning boards or tables have been invented. In a Scottish mathematician and physicist John Napier discovered that the multiplication and division of numbers could be performed by the addition and subtraction, respectively, of the logarithms of those numbers. While producing the first logarithmic tables, Napier needed to perform many tedious multiplications. It was at this point that he designed his 'Napier's bones', an abacus-like device that greatly simplified calculations that involved multiplication and division. Since real numbers can be represented as distances or intervals Wilhelm Schickard, a German polymath, designed a calculating machine in 1623 which combined a mechanised form of Napier's rods with the world's first mechanical adding machine built into the base. Because it made use of a single-tooth gear there were circumstances in which its carry mechanism would jam. A fire destroyed at least one of the machines in 1624 and it is believed Schickard was too disheartened to build another. In 1642, while still a teenager, Blaise Pascal started some pioneering work on calculating machines and after three years of effort and 50 prototypes he invented a mechanical calculator. He built twenty of these machines (called Pascal's calculator or Pascaline) in the following ten years. Nine Pascalines have survived, most of which are on display in European museums. A continuing debate exists over whether Schickard or Pascal should be regarded as the "inventor of In 1804, French weaver Joseph Marie Jacquard developed a loom in which the pattern being woven was controlled by a paper tape constructed from punched cards. The paper tape could be changed without changing the mechanical design of the loom. This was a landmark achievement in programmability. His machine was an improvement over similar weaving looms. Punched cards were preceded by punch bands, as in the machine proposed by Basile Bouchon. These bands would inspire information recording for automatic pianos and more recently numerical control machine tools. In the late 1880s, the American Herman Hollerith invented data storage on punched cards that could then be read by a machine. To process these punched cards, he invented the tabulator and the keypunch machine. His machines used electromechanical relays and counters. Hollerith's method was used in the 1890 United By the 20th century, earlier mechanical calculators, cash registers, accounting machines, and so on were redesigned to use electric motors, with gear position as the representation for the state of a variable. The word "computer" was a job title assigned to primarily women who used these calculators to perform mathematical calculations. By the 1920s, British scientist Lewis Fry Richardson's interest in weather prediction led him to propose human computers and numerical analysis to model the weather; to this day, the most powerful computers on Earth are needed to adequately model its weather using the Navier–Stokes Charles Babbage, an English mechanical engineer and polymath, originated the concept of a programmable computer. Considered the "father of the computer", he conceptualized and invented the first mechanical computer in the early 19th century. After working on his revolutionary difference engine, designed to aid in navigational calculations, in 1833 he realized that a much more general design, an Analytical Engine, was possible. The input of programs and data was to be provided to the machine via punched cards, a method being used at the time to direct mechanical looms such as the Jacquard loom. For output, the machine would have a printer, a curve plotter and a bell. The machine would also be able to punch numbers onto cards to be read in later. It employed ordinary base-10 fixed-point arithmetic. The Engine incorporated an arithmetic logic unit, control flow in the form of conditional branching and loops, and integrated memory, making it the first design for a general-purpose computer that could be described in modern terms as Turing-complete. There was to be a store, or memory, capable of holding 1,000 numbers of 40 decimal digits each (ca. 16.7 kB). An arithmetical unit, called the "mill", would be able to perform all four arithmetic operations, plus comparisons and optionally square roots. Initially it was conceived as a difference engine curved back upon itself, in a In the first half of the 20th century, analog computers were considered by many to be the future of computing. These devices used the continuously changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved, in contrast to digital computers that represented varying quantities symbolically, as their numerical values change. As an analog computer does not use discrete values, but rather continuous values, processes cannot be reliably repeated with exact equivalence, as they can with Turing machines. The first modern analog computer was a tide-predicting machine, invented by Sir William Thomson, later Lord Kelvin, in 1872. It used a system of pulleys and wires to automatically calculate predicted tide levels for a set period at a particular location and was of great utility to navigation in shallow waters. His device was the foundation for further developments in analog computing. The differential analyser, a mechanical analog computer designed to solve differential equations by integration using wheel-and-disc mechanisms, was conceptualized in 1876 by James Thomson, the brother of the more famous Lord Kelvin. He explored the possible construction of such calculators, but was stymied by the limited output torque of the ball-and-disk integrators. In a differential analyzer, the output of one integrator drove the input of the next integrator, or a graphing output. An important advance in analog computing was the development of the first fire-control systems for long range ship gunlaying. When gunnery ranges increased dramatically in The principle of the modern computer was first described by computer scientist Alan Turing, who set out the idea in his seminal 1936 paper, "On Computable Numbers". Turing reformulated Kurt Gödel's 1931 results on the limits of proof and computation, replacing Gödel's universal arithmetic-based formal language with the formal and simple hypothetical devices that became known as Turing machines. He proved that some such machine would be capable of performing any conceivable mathematical computation if it were representable as an algorithm. He went on to prove that there was no solution to the "Entscheidungsproblem" by first showing that the halting problem for Turing machines is undecidable: in general, it is not possible to decide algorithmically whether a given Turing machine will ever halt. He also introduced the notion of a "universal machine" (now known as a universal Turing machine), with the idea that such a machine could perform the tasks of any other machine, or in other words, it is provably capable of computing anything that is computable by executing a program stored on tape, allowing the machine to be programmable. Von Neumann acknowledged that the central concept of the modern computer was due to this paper. Turing machines are to this day a central object of study in theory of computation. Except for the limitations imposed by their finite memory stores, modern computers are said to be Turing-complete, which is to say, they have algorithm execution capability equivalent to a universal Turing machine. The era of modern computing began with a flurry of development before and during World War II. Most digital computers built in this period were electromechanical – electric switches drove mechanical relays to perform the calculation. These devices had a low operating speed and were eventually superseded by much faster all-electric computers, originally using vacuum tubes. The Z2 was one of the earliest examples of an electromechanical relay computer, and was created by German engineer Konrad Zuse in 1940. It was an improvement on his earlier Z1; although it used the same mechanical memory, it replaced the arithmetic and control logic with electrical relay circuits. In the same year, electro-mechanical devices called bombes were built by British cryptologists to help decipher German Enigma-machine-encrypted secret messages during World War II. The bombe's initial design was created in 1939 at the UK Government Code and Cypher School (GC&CS) at Bletchley Park by Alan Turing, with an important refinement devised in 1940 by Gordon Welchman. The engineering design and construction was the work of Harold Keen of the British Tabulating Machine Company. It was a substantial development from a The term digital was first suggested by George Robert Stibitz and refers to where a signal, such as a voltage, is not used to directly represent a value (as it would be in an analog computer), but to encode it. In November 1937, George Stibitz, then working at Bell Labs (1930–1941), completed a relay-based calculator he later dubbed the "Model K" (for "kitchen table", on which he had assembled it), which became the first binary adder. Typically signals have two states – low (usually representing 0) and high (usually representing 1), but sometimes three-valued logic is used, especially in high-density memory. Modern computers generally use binary logic, but many early machines were Purely electronic circuit elements soon replaced their mechanical and electromechanical equivalents, at the same time that digital calculation replaced analog. Machines such as the Z3, the Atanasoff–Berry Computer, the Colossus computers, and the ENIAC were built by hand, using circuits containing relays or valves (vacuum tubes), and often used punched cards or punched paper tape for input and as the main (non-volatile) storage medium. The engineer Tommy Flowers joined the telecommunications branch of the General Post Office in 1926. While working at the research station in Dollis Hill in the 1930s, he began to explore the possible use of electronics for the telephone exchange. Experimental During World War II, British codebreakers at Bletchley Park, north of London, achieved a number of successes at breaking encrypted enemy military communications. The German encryption machine, Enigma, was first attacked with the help of the electro-mechanical bombes. Women often operated these bombe machines. They ruled out possible Enigma settings by performing chains of logical deductions implemented electrically. Most possibilities led to a contradiction, and the few remaining could be tested by hand. The Germans also developed a series of teleprinter encryption systems, quite different from Enigma. The Lorenz SZ 40/42 machine was used for high-level Army communications, code-named "Tunny" by the British. The first intercepts of Lorenz messages began in 1941. As part of an attack on Tunny, Max Newman and his colleagues developed the Heath Robinson, a fixed-function machine to aid in code breaking. Tommy Flowers, a senior engineer at the Post Office Research Station Early computing machines were programmable in the sense that they could follow the sequence of steps they had been set up to execute, but the "program", or steps that the machine was to execute, were set up usually by changing how the wires were plugged into a patch panel or plugboard. "Reprogramming", when it was possible at all, was a laborious process, starting with engineers working out flowcharts, designing the new set up, and then the often-exacting process of physically re-wiring patch panels. Stored-program computers, by contrast, were designed to store a set of instructions (a program), in memory – typically the same memory as stored data. The theoretical basis for the stored-program computer had been proposed by Alan Turing in his 1936 paper. In 1945 Turing joined the National Physical Laboratory and began his work on developing an electronic stored-program digital computer. His 1945 report ‘Proposed Electronic Calculator’ was the first specification for such a device. Meanwhile, John von Neumann at the Moore School of Electrical Engineering, University of Pennsylvania, circulated his "First Draft of a Report on the EDVAC" in 1945. Although substantially similar to Turing's design and containing comparatively little engineering detail, the computer architecture The Manchester Baby was the world's first electronic stored-program computer. It was built at the Victoria University of Manchester by Frederic C. Williams, Tom Kilburn and Geoff Tootill, and ran its first program on 21 June 1948. The machine was not intended to be a practical computer but was instead designed as a testbed for the Williams tube, the first random-access digital storage device. Invented by Freddie Williams and Tom Kilburn at the University of Manchester in 1946 and 1947, it was a cathode ray tube that used an effect called secondary emission to temporarily store electronic binary data, and was used successfully in several early computers. Although the computer was small and primitive by the standards of the 1990s, it was the first working machine The Experimental machine led on to the development of the Manchester Mark 1 at the University of Manchester. Work began in August 1948, and the first version was operational by April 1949; a program written to search for Mersenne primes ran error-free for nine hours on the night of 16/17 June 1949. The machine's successful operation was widely reported in the British press, which used the phrase "electronic brain" in describing it to their readers. The other contender for being the first recognizably modern digital stored-program computer was the EDSAC, designed and constructed by Maurice Wilkes and his team at the University of Cambridge Mathematical Laboratory in England at the University of Cambridge in 1949. The machine was inspired by John von Neumann's seminal "First Draft of a Report on the ENIAC inventors John Mauchly and J. Presper Eckert proposed the EDVAC's construction in August 1944, and design work for the EDVAC commenced at the University of Pennsylvania's Moore School of Electrical Engineering, before the ENIAC was fully operational. The design implemented a number of The first commercial computer was the Ferranti Mark 1, built by Ferranti and delivered to the University of Manchester in February 1951. It was based on the Manchester Mark 1. The main improvements over the Manchester Mark 1 were in the size of the primary storage (using random access Williams tubes), secondary storage (using a magnetic drum), a faster multiplier, and additional instructions. The basic cycle time was 1.2 milliseconds, and a multiplication could be completed in about 2.16 milliseconds. The multiplier used almost a quarter of the machine's 4,050 vacuum tubes (valves). A second machine was purchased by the University of Toronto, before the design was revised into the Mark 1 Star. At least seven of these later machines were delivered between 1953 and 1957, one of them to Shell labs in Amsterdam. In October 1947, the directors of J. Lyons & Company, a British catering company famous for its teashops but with strong interests in new office management techniques, decided to take an active role in promoting the commercial development of computers. The LEO I computer became operational in April 1951 and ran the world's first regular routine In 1951, British scientist Maurice Wilkes developed the concept of microprogramming from the realisation that the central processing unit of a computer could be controlled by a miniature, highly specialised computer program in high-speed ROM. Microprogramming allows the base instruction set to be defined or extended by built-in programs (now called firmware or Magnetic drum memories were developed for the US Navy during WW II with the work continuing at Engineering Research Associates (ERA) in 1946 and 1947. ERA, then a part of Univac included a drum memory in its 1103, announced in February 1953. The first mass-produced computer, the IBM 650, also announced in 1953 had about 8.5 kilobytes of drum memory. Magnetic core memory patented in 1949 with its The bipolar transistor was invented in 1947. From 1955 onward transistors replaced vacuum tubes in computer designs, giving rise to the "second generation" of computers. Compared to vacuum tubes, transistors have many advantages: they are smaller, and require less power than vacuum tubes, so give off less heat. Silicon junction transistors were much more reliable than vacuum tubes and had longer service life. Transistorized computers could contain tens of thousands of binary logic circuits in a relatively compact space. Transistors greatly reduced computers' size, initial cost, and operating cost. Typically, second-generation computers were composed of large numbers of printed circuit boards such as the IBM Standard Modular System, each carrying one to four logic gates or flip-flops. At the University of Manchester, a team under the leadership of Tom Kilburn designed and built a machine using the newly developed transistors instead of valves. Initially the only devices available were germanium point-contact transistors, less reliable than the valves they replaced but which consumed far less power. Their first transistorised computer, and the first in the world, was operational by 1953, and a second version was completed there in April 1955. The 1955 version used 200 transistors, 1,300 solid-state diodes, and had a power consumption of 150 watts. However, the machine did make use of valves to generate its 125 kHz clock waveforms and in the circuitry to read and write on its magnetic drum memory, so it was not the first completely transistorized computer. That distinction goes to the Harwell CADET of 1955, built by the electronics division of the Atomic Energy Research Establishment at Harwell. The design featured a 64-kilobyte magnetic drum memory store with multiple moving heads that had been designed at the National Physical Laboratory, UK. By 1953 this team had transistor circuits operating to read and write on a smaller magnetic drum from the Royal Radar Establishment. The machine used a low clock speed of only 58 kHz to avoid having to use any valves to generate the clock waveforms. CADET used 324 point-contact transistors provided by the UK company Standard Telephones and Cables; 76 junction transistors were used for the first stage amplifiers for data read from the drum, since point-contact transistors were too noisy. From August 1956 CADET was offering a regular computing service, during which it often executed continuous computing runs of 80 hours or more. Problems with the reliability of early batches of point contact and alloyed junction transistors meant that the machine's mean time between failures was about 90 minutes, but this improved once the more reliable bipolar junction transistors became available. The Manchester University Transistor Computer's design was adopted by the local engineering firm of Metropolitan-Vickers in their Metrovick 950, the first commercial transistor computer anywhere. Six Metrovick 950s were built, the first completed in 1956. They were successfully deployed within various departments of the company and were in use for about five years. A second generation computer, the IBM 1401, captured about one third of the world market. IBM installed more than ten thousand 1401s between 1960 and 1964. The "third-generation" of digital electronic computers used integrated circuit (IC) chips as the basis of their logic. The idea of an integrated circuit was conceived by a radar scientist working for the Royal Radar Establishment of the Ministry of Defence, Geoffrey W.A. Dummer. The first working integrated circuits were invented by Jack Kilby at Texas Instruments and Robert Noyce at Fairchild Semiconductor. Kilby recorded his initial ideas concerning the integrated circuit in July 1958, successfully demonstrating the first working integrated example on 12 September 1958. Kilby's invention was a hybrid integrated circuit (hybrid IC). It had external The MOSFET (metal-oxide-semiconductor field-effect transistor, or MOS transistor) was invented by Mohamed M. Atalla and Dawon Kahng at Bell Labs in 1959. In addition to data processing, the MOSFET enabled the practical use of MOS transistors as memory cell storage elements, a function previously served by magnetic cores. Semiconductor memory, also known The "fourth-generation" of digital electronic computers used microprocessors as the basis of their logic. The microprocessor has origins in the MOS integrated circuit (MOS IC) chip. The MOS IC was first proposed by Mohamed M. Atalla at Bell Labs in 1960, and then fabricated by Fred Heiman and Steven Hofstein at RCA in 1962. Due to rapid MOSFET scaling, MOS IC chips rapidly increased in complexity at a rate predicted by Moore's law, leading to large-scale integration (LSI) with hundreds of transistors on a single MOS chip by the late 1960s. The application of MOS LSI chips to computing was the basis for the first microprocessors, as engineers began recognizing that a complete computer processor could be contained on a single MOS LSI chip. The subject of exactly which device was the first microprocessor is contentious, partly due to lack of agreement on the exact definition of the term "microprocessor". The earliest multi-chip microprocessors were the Four-Phase Systems AL-1 in 1969 and Garrett AiResearch MP944 in 1970, developed with multiple MOS LSI chips. The first single-chip microprocessor was the Intel 4004, developed on a single PMOS LSI chip. It was designed and realized by Ted Hoff, Federico Faggin, Masatoshi Shima and Stanley Mazor at Intel, and released in 1971. Tadashi Sasaki and Masatoshi Shima at Busicom, a calculator manufacturer, had the initial insight that the CPU could be a single MOS LSI chip, supplied by Intel. While the earliest microprocessor ICs literally contained only the processor, i.e. the central processing unit, of a computer, their progressive development naturally led to chips containing most or all of the internal electronic parts of a computer. The integrated circuit in the image on the right, for example, an Intel 8742, is an 8-bit microcontroller that includes a CPU running at 12 MHz, 128 bytes of RAM, 2048 bytes of EPROM, and I/O in the same chip. During the 1960s there was considerable overlap between second and third generation technologies. IBM implemented its IBM Solid Logic Technology modules in hybrid circuits for the IBM System/360 in 1964. As late as 1975, Sperry Univac continued the manufacture of second-generation machines such as the UNIVAC 494. The Burroughs large systems such as the B5000 were stack machines, which allowed for simpler programming. These pushdown automatons were also implemented in minicomputers and microprocessors later, which influenced programming language design. Minicomputers served as low-cost computer centers for industry, business and universities. It became possible to simulate analog circuits with the "simulation program with integrated circuit emphasis", or SPICE (1971) on minicomputers, one of the programs for electronic design automation (). The microprocessor led to the development of the microcomputer, small, low-cost computers that could be owned by individuals and small businesses. Microcomputers, the first of which appeared in the 1970s, became ubiquitous in the 1980s and beyond. While which specific system is considered the first microcomputer is a matter of debate, as there were several unique hobbyist systems developed based on the Intel 4004 and its successor, the Intel 8008, the first commercially available microcomputer kit was the Intel 8080-based Altair 8800, which was announced in the January 1975 cover article of "Popular Electronics". However, this was an extremely limited system in its initial stages, having only 256 bytes of DRAM in its An indication of the rapidity of development of this field can be inferred from the history of the seminal 1947 article by Burks, Goldstine and von Neumann. By the time that anyone had time to write anything down, it was obsolete. After 1945, others read John von Neumann's "First Draft of a Report on the EDVAC", and immediately started implementing their own systems. To this day, the rapid pace of development has continued, worldwide. A 1966 article in "Time" predicted that: "By 2000, the machines will be producing so much that everyone in the U.S. will, in effect, be independently wealthy. How to use leisure time will be a major problem."
The history of computing hardware covers the developments from early simple devices to aid calculation to modern day computers. Before the 20th century, most calculations were done by humans. Early mechanical tools to help humans with digital calculations, like the abacus, were referred to as "calculating machines" or "calculators" (and other proprietary names). The machine operator was called the "computer".
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214, 114864, 70, 3647, 6, 188336, 5423, 47, 186, 61924, 71, 707, 65042, 297, 390, 88303, 9, 73, 103391, 15, 35613, 35839, 199232, 707, 151269, 1771, 47617, 122378, 7, 3542, 126809, 100, 70, 7082, 19295, 53, 20271, 6, 95162, 1995, 678, 70, 4488, 19686, 214, 99, 123470, 42477, 6, 228214, 7, 15, 24947, 16, 23, 41906, 136, 40191, 5, 6, 24947, 4, 7068, 10, 2831, 111, 11789, 54818, 99201, 10, 47617, 98323, 23, 6863, 12062, 363, 4, 171530, 23, 22482, 49795, 5, 581, 5117, 46889, 9, 102446, 297, 13909, 4, 70, 90540, 42830, 4, 2843, 171530, 23, 49795, 1902, 1672, 6, 107944, 14251, 61028, 7, 111, 47617, 98323, 5, 151269, 1771, 56458, 98323, 33407, 297, 23, 45604, 678, 6863, 581, 333, 771, 320, 3900, 164, 1290, 509, 26868, 297, 23, 40191, 5, 28090, 47114, 98, 19364, 3900, 164, 22230, 91995, 71, 241433, 43333, 7, 23, 13909, 4331, 7, 4, 68772, 6, 58944, 47, 70, 44, 191633, 58093, 58, 111, 13909, 7, 5, 113307, 297, 47, 241433, 43333, 7, 4, 3900, 164, 22230, 765, 5941, 92940, 7, 12, 1836, 621, 164917, 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summarize: The physical universe is defined as all of space and time (collectively referred to as spacetime) and their contents. Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space. The universe also includes the physical The word "universe" derives from the Old French word "univers", which in turn derives from the Latin word "universum". The Latin word was used by Cicero and later Latin authors in many of the same senses as the modern English word is used. A term for "universe" among the ancient Greek philosophers from Pythagoras onwards was, "tò pân" ("the all"), defined as all matter and all space, and, "tò hólon" ("all things"), which did not necessarily include the void. Another synonym was, "ho kósmos" (meaning The prevailing model for the evolution of the universe is the Big Bang theory. The Big Bang model states that the earliest state of the universe was an extremely hot and dense one, and that the universe subsequently expanded and cooled. The model is based on general relativity and on simplifying assumptions such as homogeneity and isotropy of space. A version of the model with a cosmological constant (Lambda) and cold dark matter, known as the Lambda-CDM model, is the simplest model that provides a reasonably good account of various observations about the universe. The Big Bang model accounts for observations such as the correlation of distance and redshift of galaxies, the ratio of the number of hydrogen to helium atoms, and the microwave radiation background. The initial hot, dense state is called the Planck epoch, a brief period extending from time zero to one Planck time unit of approximately 10 seconds. During the Planck epoch, all types of matter and all types of energy were concentrated into a dense state, and gravity—currently the weakest by far of the four known forces—is believed to have been as strong as the other fundamental forces, and all the forces may have been unified. Since the Planck epoch, space has been expanding to its present scale, with a very short but intense period of cosmic inflation believed to have occurred within the first 10 seconds. This was a kind of expansion different from those we can see around us today. Objects in space did not physically move; instead the metric that defines space itself changed. Although objects in spacetime cannot move faster than the speed of light, this limitation does not apply to the metric governing spacetime itself. This initial period of inflation is believed to explain why space appears to be very flat, and much larger than light could travel since the start of the universe. Within the first fraction of a second of the universe's existence, the four fundamental forces had separated. As the universe continued to cool down from its inconceivably hot state, various types Of the four fundamental interactions, gravitation is the dominant at astronomical length scales. Gravity's effects are cumulative; by contrast, the effects of positive and negative charges tend to cancel one another, making electromagnetism relatively insignificant on astronomical length scales. The remaining two interactions, the weak and strong nuclear forces, decline very rapidly with distance; their effects are confined mainly to sub-atomic length scales. The universe appears to have much more matter than antimatter, an asymmetry possibly related to the CP violation. This imbalance between matter and antimatter is partially responsible for the existence of all matter existing today, since matter and antimatter, if equally produced at the Big Bang, would have completely annihilated each other and left only photons as a result of their interaction. The universe also appears to have neither net momentum nor angular momentum, which follows accepted physical laws if the universe is finite. These laws are Gauss's law and the non-divergence of the stress-energy-momentum pseudotensor. The size of the universe is somewhat difficult to define. According to the general theory of relativity, far regions of space may never interact with ours even in the lifetime of the universe due to the finite speed of light and the ongoing expansion of space. For example, radio messages sent from Earth may never reach some regions of space, even if the universe were to exist forever: space may expand faster than light can traverse it. Distant regions of space are assumed to exist and to be part of reality as much as we are, even though we can never interact with them. The spatial region that we can affect and be affected by is the observable universe. The observable universe depends on the location of the observer. By traveling, an observer can come into contact with a greater region of spacetime than an observer who remains still. Nevertheless, even the most rapid traveler will not be able to interact with all of space. Typically, the observable Astronomers calculate the age of the universe by assuming that the Lambda-CDM model accurately describes the evolution of the Universe from a very uniform, hot, dense primordial state to its present state and measuring the cosmological parameters which constitute the model. This model is well understood theoretically and supported by recent high-precision astronomical observations such as WMAP and Planck. Commonly, the set of observations fitted includes the cosmic microwave background anisotropy, the brightness/redshift relation for Type Ia supernovae, and large-scale Spacetimes are the arenas in which all physical events take place. The basic elements of spacetimes are events. In any given spacetime, an event is defined as a unique position at a unique time. A spacetime is the union of all events (in the same way that a line is the union of all of its points), formally organized into a manifold. The universe appears to be a smooth spacetime continuum consisting of three spatial dimensions and one temporal (time) dimension (an event in the spacetime of the physical universe can therefore be identified by a set of four coordinates: ("x", "y", "z", "t") ). On the average, space is observed to be very nearly flat (with a curvature close to zero), meaning that Euclidean geometry is General relativity describes how spacetime is curved and bent by mass and energy (gravity). The topology or geometry of the universe includes both local geometry in the observable universe and global geometry. Cosmologists often work with a given space-like slice of spacetime called the comoving coordinates. The section of spacetime which can be observed is the backward light cone, which delimits the cosmological horizon. The cosmological horizon (also called the particle horizon or the light horizon) is the maximum distance from which particles can have traveled to the observer in the age of the universe. This horizon represents the boundary between the The universe may be "fine-tuned"; the Fine-tuned universe hypothesis is the proposition that the conditions that allow the existence of observable life in the universe can only occur when certain universal fundamental physical constants lie within a The universe is composed almost completely of dark energy, dark matter, and ordinary matter. Other contents are electromagnetic radiation (estimated to constitute from 0.005% to close to 0.01% of the total mass-energy of the universe) and antimatter. The proportions of all types of matter and energy have changed over the history of the universe. The total amount of electromagnetic radiation generated within the universe has decreased by 1/2 in the past 2 billion years. Today, ordinary matter, which includes atoms, stars, galaxies, and life, accounts for only 4.9% of the contents of the Universe. The present overall density of this type of matter is very low, roughly 4.5 × 10 grams per cubic centimetre, corresponding to a density of the order of only one proton for every four cubic metres of volume. The nature of both dark energy and dark matter is unknown. Dark matter, a mysterious form of matter that has not yet been identified, accounts for 26.8% of the cosmic contents. Dark energy, which is the energy of empty space and is causing the expansion of the universe to accelerate, accounts for the remaining 68.3% of the contents. Matter, dark matter, and dark energy are distributed homogeneously throughout the universe over length scales longer than 300 million light-years or so. However, over shorter length-scales, matter tends to clump hierarchically; many atoms are condensed into stars, most stars into galaxies, most galaxies into clusters, superclusters and, finally, large-scale galactic filaments. The observable universe contains more than 2 trillion (10) galaxies and, overall, as many as an estimated stars (more stars than all the grains of sand on planet Earth). Typical galaxies range from dwarfs with as few as ten million (10) stars up to giants with one trillion (10) stars. Between the larger structures are voids, which are typically 10–150 Mpc (33 million–490 million ly) in diameter. The Milky Way is in the Local Group of galaxies, which in turn is in the Laniakea Supercluster. This supercluster spans over 500 million light-years, while the Local Group spans over 10 million light-years. The Universe also has vast regions of relative emptiness; the largest known void measures 1.8 billion ly (550 Mpc) across. The observable universe is isotropic on scales significantly larger than superclusters, meaning that the statistical properties of the universe are the same in all directions as observed from Earth. The universe is bathed in highly isotropic microwave radiation that corresponds to a thermal equilibrium blackbody spectrum of roughly 2.72548 kelvins. The hypothesis that the large-scale universe is homogeneous and isotropic is known as the cosmological principle. A universe that is both homogeneous and isotropic looks the same from all vantage points and has no center. General relativity is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics. It is the basis of current cosmological models of the universe. General relativity generalizes special relativity and Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or spacetime. In particular, the curvature of spacetime is directly related to the energy and momentum of whatever matter and radiation are present. The relation is specified by the Einstein field equations, a system of partial differential equations. In general relativity, the distribution of matter and energy determines the geometry of spacetime, which in turn describes the acceleration of matter. Therefore, solutions of the Einstein field equations describe the evolution of the universe. Combined with measurements of the amount, type, and distribution of matter in the universe, the equations of Some speculative theories have proposed that our universe is but one of a set of disconnected universes, collectively denoted as the multiverse, challenging or enhancing more limited definitions of the universe. Scientific multiverse models are distinct from concepts such as alternate planes of consciousness and simulated reality. Max Tegmark developed a four-part classification scheme for the different types of multiverses that scientists have suggested in response to various Physics problems. An example of such multiverses is the one resulting from the chaotic inflation model of the early universe. Another is the multiverse resulting from the many-worlds interpretation of quantum mechanics. In this interpretation, parallel worlds are generated in a manner similar to quantum superposition and decoherence, with all states of the wave functions being realized in separate worlds. Effectively, in the many-worlds interpretation the multiverse evolves as a universal wavefunction. If the Big Bang that created our multiverse created an ensemble of multiverses, the wave function of the ensemble would be entangled in this sense. The least controversial, but still highly disputed, category of Historically, there have been many ideas of the cosmos (cosmologies) and its origin (cosmogonies). Theories of an impersonal universe governed by physical laws were first proposed by the Greeks and Indians. Ancient Chinese philosophy encompassed the notion of the universe including both all of space and all of time. Over the centuries, improvements in astronomical observations and theories of motion and gravitation led to ever more accurate descriptions of the universe. The modern era of cosmology began with Albert Einstein's 1915 general theory of relativity, which made it possible to quantitatively predict the origin, evolution, and conclusion of the universe as a whole. Most modern, accepted theories of cosmology are based on general relativity and, more specifically, the predicted Big Bang. Many cultures have stories describing the origin of the world and universe. Cultures generally regard these stories as having some truth. There are however many differing beliefs in how these stories apply amongst those believing in a supernatural origin, ranging from a god directly creating the universe as it is now to a god just setting the "wheels in motion" (for example via mechanisms such as the big bang and evolution). Ethnologists and anthropologists who study myths have developed various classification schemes for the various themes that appear in creation stories. For example, in one type of story, the world is born from a world egg; such stories include the Finnish epic poem "Kalevala", The pre-Socratic Greek philosophers and Indian philosophers developed some of the earliest philosophical concepts of the universe. The earliest Greek philosophers noted that appearances can be deceiving, and sought to understand the underlying reality behind the appearances. In particular, they noted the ability of matter to change forms (e.g., ice to water to steam) and several philosophers proposed that all the physical materials in the world are different forms of a single primordial material, or "arche". The first to do so was Thales, who proposed this material to be water. Thales' student, Anaximander, proposed that everything came from the limitless "apeiron". Anaximenes proposed the primordial material to be air on account of its perceived attractive and repulsive qualities that cause the "arche" to condense or dissociate into different forms. Anaxagoras proposed the principle of "Nous" (Mind), while Heraclitus proposed fire (and spoke of "logos"). Empedocles proposed the elements to be earth, water, air and fire. His four-element model became very popular. Like Pythagoras, Plato believed that all things were composed of number, with Empedocles' elements taking the form of the Platonic solids. Democritus, and later philosophers—most notably Leucippus—proposed that the universe is composed of Astronomical models of the universe were proposed soon after astronomy began with the Babylonian astronomers, who viewed the universe as a flat disk floating in the ocean, and this forms the premise for early Greek maps like those of Anaximander and Hecataeus of Miletus. Later Greek philosophers, observing the motions of the heavenly bodies, were concerned with developing models of the universe-based more profoundly on empirical evidence. The first coherent model was proposed by Eudoxus of Cnidos. According to Aristotle's physical interpretation of the model, celestial spheres eternally rotate with uniform motion around a stationary Earth. Normal matter is entirely contained within the terrestrial sphere. "De Mundo" (composed before 250 BC or between 350 and 200 BC), stated, "Five elements, situated in spheres in five regions, the less being in each case surrounded by the greater—namely, earth surrounded by water, water by air, air by fire, and fire by ether—make up the whole universe". This model was also refined by Callippus and after concentric spheres were abandoned, it was brought into nearly perfect agreement with astronomical observations by Ptolemy. The success of such a model is largely due to the mathematical fact that any Footnotes Citations
The universe () is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. While the spatial size of the entire universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light-years in diameter. In various multiverse hypotheses, "a universe" is one of many causally disconnected constituent parts of a larger multiverse, which itself comprises all of space and time and its contents; as a consequence, ‘the universe’ and ‘the multiverse’ are synonymous in such theories.
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summarize: A large number of mushroom species are favored for eating by mushroom hunters. The king bolete is a popular delicacy. Sulphur shelf (also known as chicken mushroom and chicken of the woods) is often gathered because it occurs in bulk, recurs year after year, is easily identified, and has a wide variety of culinary uses. Pine mushrooms, chanterelles, morels, oyster mushrooms, puffballs and polypores are among the most popular types of mushrooms to gather, most of these being fairly simple to properly identify by anyone with practice. Much more care, education, and experience is typically required to make a positive identification of many species, however, and as such, few collect from more dangerous groups, such as "Amanita", which include some of the most toxic mushrooms in existence. Many field guides on mushrooms are available and recommended to help safely distinguish edible from the many poisonous mushrooms. Identification is not the only element of mushroom hunting that takes practice; knowing where and when to search does as well. Most mushroom species require very specific conditions. Some only grow at the base of a certain type of tree, for example. Finding a desired species that is known to grow in a certain region can be a challenge. Some mushrooms are deadly or extremely hazardous when consumed. Some that are not deadly can nevertheless cause permanent organ damage. Common safety advice includes: "Little brown mushrooms" (or LBMs) refers to a large number of small, dull-coloured agaric species, with few macromorphological uniquely distinguishing characteristics. As a result, LBMs typically range from difficult to impossible for mushroom hunters to identify. Experienced mushroomers may discern more subtle identifying traits that help narrow the mushroom down to a particular genus or group of species, but exact identification of LBMs often requires close examination of microscopic characteristics plus a certain degree of familiarity or specialization in that particular group. For mycologists, LBMs are the equivalent of LBJs ("little brown jobs") and DYCs ("damned yellow composites") that are the bane of ornithologists and botanists, respectively. "Big white mushroom" (or BWM) is also sometimes used to describe groups of difficult to identify larger and paler agarics, many of which are in the genus "Clitocybe." The "Amanita muscaria"'s psychotropic properties have been traditionally used by shamans in Siberia in their rituals. However, its use for such purposes today is very rare, despite the mushroom's abundance. Instead, the "Psilocybe semilanceata" is sought after for its hallucinogenic properties, the latter being more desirable with fewer side effects than those of "A. muscaria". The use of "P. semilanceata" is however significantly hindered by its small size, requiring larger quantities and being hard to spot. Other Psilocybe species are abundant in the American south and west, as well as Mexico, where they have been used by traditional shamans for centuries. In the west, one can often find mushroom pickers in cow pastures in a stereotypical stoop looking in the grass for psilocybes. This can be quite dangerous, as many species grow in pastures and amateurs often misidentify psilocybes. The popularity of mushroom picking in some parts of the world has led to mushroom festivals. The festivals are usually between September and October, depending on the mushrooms available in a particular region. Festivals in North America include: Nuclear fallout from the Chernobyl disaster is an important issue concerning mushroom picking in Europe. Due to the wide spread of their mycelium, mushrooms tend to accumulate more radioactive caesium-137 than surrounding soil and other organisms. State agencies (e.g. Bellesrad in Belarus) monitor and analyze the degree of radionuclide accumulation in various wild species of plants and animals. In particular, Bellesrad claims that Svinushka ("Paxillus" ssp.), Maslenok ("Suillus" ssp.), Mokhovik ("Xerocomus" ssp.), and Horkushka ("Lactarius rufus") are the worst ones in this respect. The safest one is Opyonok Osyenniy ("Armillaria mellea"). This is an issue not only in Poland, Belarus, Ukraine and Russia: the fallout also reached western Europe, and until recently the German government discouraged people gathering certain mushrooms. The situation is treated with black humor in some Russian jokes." Many mushroom guidebooks call attention to similarities between species, especially significant if an edible species is similar to, or commonly confused with, one that is potentially harmful. Examples: There are treatments to reduce or eliminate the toxicity of certain (but not all) poisonous species to the point where they may be edible. For instance, false morels are deadly poisonous when eaten raw or incorrectly prepared, but their toxins can be reduced by a proper method of parboiling. Prepared in this way, this mushroom is widely used and considered a delicacy in many European countries, although recent research suggests that there may still be long-term health consequences from eating it. Commonly gathered species, grouped by their order taxa, are as follows: mushroom species mentioned in each group are listed at the end of the paragraph using the following convention: Latin name (common English names, if any). The genus "Macrolepiota", usually "Macrolepiota procera", and, to a lesser extent, "M. rhacodes" are highly regarded, especially in Europe, being very palatable and very large, with specimens of "M. procera" as high as one metre being reported. While the family of amanitas are approached with extreme caution, as it contains the lethal "Amanita phalloides" and "Amanita virosa", those confident in their skills often pick the "Amanita rubescens", which is highly prized in Europe and to a much lesser extent in Russia, accounted by some not to superior taste, but to its relation to the "Amanita caesarea", which is not found in Russia, but was considered a delicacy worthy of the emperor in Ancient Rome. This order is often viewed as the order of "noble" mushrooms, containing few poisonous species, identifiable with relative ease, and having superior palatability. The most notable species is the "Boletus edulis", the "mushroom king", an almost legendary, relatively rare mushroom, edible in almost any (even raw) form, and commonly considered "the" best-tasting mushroom. (It is common to confuse the Russian name, literally "white mushroom", with champignons, often known in English as "white mushrooms".) The genus "Leccinum" includes two well-known mushroom species named after the trees they can usually be found next to. The "Leccinum aurantiacum" (as well as the "Leccinum versipelle"), found under aspen trees, and the "Leccinum scabrum" (as well as the "L. holopus"), found under birch trees. The secondary mentioned species, are significantly different in cap colour only. Both types are very sought after, being highly palatable, while more common than the B. edulis. The genus "Suillus", characterised by its slimy cap, is another prized mushroom, the "Suillus luteus" and "Suillus granulatus" being its most common varieties, and while abundant in some parts of Eurasia, is a rare occurrence in others. It is easy to identify and very palatable. The genus "Xerocomus" is generally considered a less desirable (though mostly edible) mushroom group, due to common abundant mould growth on their caps, which can make them poisonous. The "Xerocomus badius", however is an exception, being moderately sought after, especially in Europe. Some scientific classifications now consider species in the genus "Xerocomus" as members of "Boletus". The "Cantharellus cibarius", a common and popular mushroom, especially in Europe, is a choice edible and unique mushroom. It is very rarely infested by worms or larvae, has a unique appearance, and when rotting, the decomposed parts are easily distinguishable and separable from those that are edible. The "Gyromitra esculenta" is considered poisonous, but can be consumed if dried and stored for over a year, according to Slavic literature, and can be used to supplement or replace morel (see "Morchellaceae" below) mushrooms, while Western literature claims that even the fumes of the mushroom are dangerous. It is similar to morels both in appearance and palatability. The morel, "Morchella esculenta" is highly prized in Western Europe, India and North America. It is significantly less prized in Slavic countries where, like the "Gyromitra esculenta", it is considered marginally edible with mediocre palatability. Boiling the mushroom and discarding the water is often recommended. Members of the genus "Lactarius", as the name suggests, lactate a milky liquid when wounded and are often scoffed upon by Western literature. The "Lactarius deliciosus" is however regarded as one of the most palatable mushrooms in Slavic culture, comparable to the "Boletus edulis". Also considered as similarly palatable are the species "Lactarius necator" and particularly "Lactarius resimus". Thermal treatment may however be necessary in some cases. Slightly less appealing due to its bitter taste is the "Lactarius pubescens". The Russula family includes over 750 species and is one of the most common and abundant mushrooms in Eurasia. Their cap colours include red, brown, yellow, blue and green and can be easily spotted. The "Russula vesca" species, one of the many red-capped varieties, is one of the most common, is reasonably palatable and can be eaten raw. The edible Russulas have a mild taste, compared to many inedible or poisonous species that have a strong hot or bitter taste - but notice that the deadly poisonous Amanita phalloides, Amanita virosa and many other poisonous mushrooms have mild taste! The "Russula emetica" (the sickener) is known to cause gastrointestinal upset and has a very hot taste when a small bit is placed on the tongue. Due to their abundance they are however often regarded as an inferior mushroom for hunting, since they may be eaten if parboiled.
Mushroom hunting, mushrooming, mushroom picking, mushroom foraging, shrooming, and similar terms describe the activity of gathering mushrooms in the wild, typically for food. This practice is popular throughout most of Europe, Australia, Japan, Korea, parts of the Middle East, and the Indian subcontinent, as well as the temperate regions of Canada and the United States.
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summarize: In the late 1950s, computer users and manufacturers were becoming concerned about the rising cost of programming. A 1959 survey had found that in any data processing installation, the programming cost US$800,000 on average and that translating programs to run on new hardware would cost $600,000. At a time when new programming languages were proliferating at an ever-increasing rate, the same survey suggested that if a common business-oriented language were used, conversion would be far cheaper and faster. On 8 April 1959, Mary K. Hawes, a computer scientist at Burroughs Corporation, On 28 and 29 May 1959 (exactly one year after the Zürich ALGOL 58 meeting), a meeting was held at the Pentagon to discuss the creation of a common programming language for business. It was attended by 41 people and was chaired by Phillips. The Department of Defense was concerned about whether it could run the same data processing programs on different computers. FORTRAN, the only mainstream language at the time, lacked the features needed to write such programs. Representatives enthusiastically described a language that could work in a wide variety of environments, from banking and insurance to utilities and inventory control. They agreed unanimously that more people should be able to program and that the new language should not be restricted by the limitations of contemporary technology. A majority agreed that the language should make maximal use of English, be capable of change, be machine-independent and be easy to use, even at the expense of power. The meeting resulted in the creation of a steering committee and short-, intermediate- and long-range committees. The short-range committee was given to September (three months) to produce specifications for an interim language, which would then be improved upon by the other committees. Their official mission, however, was to identify the strengths and weaknesses Many logical flaws were found in "COBOL 60", leading GE's Charles Katz to warn that it could not be interpreted unambiguously. A reluctant short-term committee enacted a total cleanup and, by March 1963, it was reported that COBOL's syntax was as definable as ALGOL's, although semantic ambiguities remained. Early COBOL compilers were primitive and slow. A 1962 US Navy evaluation found compilation speeds of 3–11 statements per minute. By mid-1964, they had increased to 11–1000 statements per minute. It was Efforts began to standardize COBOL to overcome incompatibilities between versions. In late 1962, both ISO and the United States of America Standards Institute (now ANSI) By 1970, COBOL had become the most widely used programming language in the world. Independently of the ANSI committee, the CODASYL Programming Language Committee was working on improving the language. They described new versions in 1968, 1969, 1970 and 1973, including changes such as new inter-program communication, debugging and file merging facilities as well as improved string-handling and library inclusion features. Although CODASYL was independent of the ANSI committee, the "CODASYL Journal of Development" was used by ANSI to identify features that were popular enough to warrant implementing. The Programming Language Committee also liaised with ECMA and In June 1978, work began on revising COBOL-74. The proposed standard (commonly called COBOL-80) differed significantly from the previous one, causing concerns about incompatibility and conversion costs. In January 1981, Joseph T. Brophy, Senior Vice-President of Travelers Insurance, threatened to sue the standard committee because it was not upwards compatible with COBOL-74. Mr. Brophy described previous conversions of their 40-million-line code base as "non-productive" and a "complete waste of our programmer resources". Later that year, the Data Processing Management Association (DPMA) said it was "strongly opposed" to the new standard, citing "prohibitive" conversion costs and enhancements that were "forced on the user". During the first public review period, the committee received 2,200 responses, of which 1,700 were negative form letters. Other responses were detailed analyses of the effect COBOL-80 would have on their systems; conversion costs were predicted to be at least 50 cents per line of code. Fewer than a dozen of the responses were in favor of the proposed standard. ISO TC97-SC5 installed in 1979 the international COBOL Experts Group, on In 1997, Gartner Group estimated that there were a total of 200 billion lines of COBOL in existence, which ran 80% of all business programs. In the early 1990s, work began on adding object-orientation in the next full revision of COBOL. Object-oriented features were taken from C++ and Smalltalk. The initial estimate was to have this revision completed by 1997, and an ISO Committee Draft Between 2003 and 2009, three technical reports were produced describing object finalization, XML processing and collection classes for COBOL. COBOL 2002 suffered from poor support: no compilers completely supported the standard. Micro Focus COBOL programs are used globally in governments and businesses and are running on diverse operating systems such as z/OS, z/VSE, VME, Unix, OpenVMS and Windows. In 1997, the Gartner Group reported that 80% of the world's business ran on COBOL with over 200 billion lines of code and 5 billion lines more being written annually. Near the end of the 20th century, the year 2000 problem (Y2K) was the focus of significant COBOL programming effort, sometimes by the same programmers who had designed the systems decades before. The particular level of effort required to correct COBOL code has been attributed to the large amount of business-oriented COBOL, as business applications use dates heavily, and to fixed-length data fields. After the clean-up effort put into these programs for Y2K, a 2003 survey found that many remained in use. The authors said that the survey data suggest "a gradual decline in the importance of Cobol in application development over the [following] 10 years unless... integration with other languages and technologies can be adopted". In 2006 and 2012, "Computerworld" surveys COBOL has an English-like syntax, which is used to describe nearly everything in a program. For example, a condition can be expressed as or more concisely as or. More complex conditions can be "abbreviated" by removing repeated conditions and variables. For example, can be shortened to. To support this English-like syntax, COBOL has over 300 keywords. Some of the keywords are simple alternative or pluralized spellings of the same word, which provides for more English-like statements and clauses; e.g., the and keywords can be used interchangeably, as can and, and and. Each COBOL program is COBOL's syntax is usually described with a unique metalanguage using braces, brackets, bars and underlining. The metalanguage was developed for the original COBOL specifications. Although Backus–Naur form did exist at the time, the committee had not heard of it. As an example, consider the following description of an codice_12 statement: formula_1 This description permits the following variants: ADD 1 TO x ADD 1, a, b TO x ROUNDED, y, z ROUNDED ADD a, b TO c END-ADD ADD a TO b COBOL can be written in two formats: fixed (the default) or free. In fixed-format, code must be aligned to fit in certain areas (a hold-over from using punched cards). Until COBOL 2002, these were: In COBOL 2002, Areas A and B were merged The identification division identifies the following code entity and contains the definition of a class or interface. Classes and interfaces have been in COBOL since 2002. Classes have factory objects, containing class methods and variables, and instance objects, containing instance methods and variables. Inheritance and interfaces provide polymorphism. Support for generic programming is provided through parameterized classes, which can be instantiated to use any class or interface. Objects are stored as references which may be restricted to a certain type. There are two ways of calling a method: the statement, which acts similarly to, or through inline method invocation, which is analogous to using functions. INVOKE my-class "foo" RETURNING var MOVE my-class::"foo" TO var *> Inline method invocation COBOL does not provide a way to hide methods. Class data can be hidden, however, by declaring it without a clause, which leaves the user with no way to access it. Method overloading was added in COBOL 2014. The environment division contains the configuration section and the input-output section. The configuration section is used to specify variable features such as currency signs, locales and character sets. The input-output section contains file-related information. COBOL supports three file formats, or ': sequential, indexed and relative. In sequential files, records are contiguous and must be traversed sequentially, similarly to a linked list. Indexed files have one or more indexes which allow records to be randomly accessed and which can be sorted on them. Each record must have a unique key, but other, ', record keys need not be unique. Implementations of indexed files vary between vendors, although common implementations, such as C‐ISAM and VSAM, are based on IBM's ISAM. Relative files, like indexed files, have a unique record key, but they do not have alternate keys. A relative record's key is its ordinal position; for example, the 10th record has a key of 10. This means that creating a record with a key of 5 may require the creation of (empty) preceding records. Relative files also allow for both sequential and random access. A common non-standard extension is the " organization, used to process text files. Records in a file are terminated by a newline and may be of varying length. The data division is split into six sections which declare different items: the file section, for file records; the working-storage section, for static variables; the local-storage section, for automatic variables; the linkage section, for parameters and the return value; the report section and the screen section, for text-based user interfaces. Data items in COBOL are declared hierarchically through the use of level-numbers which indicate if a data item is part of another. An item with a higher level-number is subordinate to an item with a lower one. Top-level data items, with a level-number of 1, are called '. Items that have subordinate aggregate data are called '; those that do not are called ". Level-numbers used to describe standard data items are between 1 A level-number of 66 is used to declare a re-grouping of previously defined items, irrespective of how those items are structured. This data level, also referred to by the associated, is rarely used and, circa 1988, was usually found in old programs. Its ability to ignore the hierarchical and logical structure data meant its use was not recommended and many installations forbade its use. A 77 level-number indicates the item is stand-alone, and in such situations is equivalent to the Standard COBOL provides the following data types: Type safety is variable in COBOL. Numeric data is converted between different representations and sizes silently and alphanumeric data can be placed in any data item that can be stored as a string, including numeric and group data. In contrast, object references and pointers may only be assigned from items of the same type and their values may be restricted to a certain type. The report writer is a declarative facility for creating reports. The programmer need only specify the report layout and the data required to produce it, freeing them from having to write code to handle things like page breaks, data formatting, and headings and footings. Reports are associated with report files, which are files which may only be written to through report writer statements. Each report is defined in the report section of the data division. A report is split into report groups which define the report's headings, footings and details. Reports work around hierarchical ". Control breaks occur when The sections and paragraphs in the procedure division (collectively called procedures) can be used as labels and as simple subroutines. Unlike in other divisions, paragraphs do not need to be in sections. Execution goes down through the procedures of a program until it is terminated. To use procedures as subroutines, the verb is used. A statement somewhat resembles a procedure call in a modern language in the sense that execution returns to the code following the statement at the end of the called code; however, it does not provide any mechanism for parameter passing or for returning a result COBOL 2014 has 47 statements (also called "), which can be grouped into the following broad categories: control flow, I/O, data manipulation and the report writer. The report writer statements are covered in the report writer section. Some statements, such as and, may themselves contain statements. Such statements may be terminated in two ways: by a period (""), which terminates "all" unterminated statements contained, or by a scope terminator, which terminates the nearest matching open statement. IF invalid-record IF invalid-record END-IF Nested statements terminated with a period are a common source of bugs. For example, examine the following code: The original (1959) COBOL specification supported the infamous statement, for which many compilers generated self-modifying code. codice_29 and codice_30 are procedure labels, and the single statement in procedure codice_29 executed after such an statement means instead. Many compilers still support it, but it was deemed obsolete in the COBOL 1985 standard and deleted in 2002. The statement was poorly regarded because it undermined "locality of context" and made a program's overall logic difficult to comprehend. As textbook author Daniel D. McCracken wrote in 1976, when "someone who has never seen the program before must become familiar with it as quickly as possible, sometimes under critical time pressure because the program has failed... the sight of a GO TO statement in a paragraph by itself, signaling as it does the existence of an unknown number of ALTER statements at unknown locations throughout the program, strikes fear in the heart of the bravest programmer." A "Hello, world" program in COBOL: When the – now famous – "Hello, World!" program example in "The C Programming Language" was first published in 1978 a similar mainframe COBOL program sample would have been submitted through JCL, very likely using a punch card reader, and 80 column punch cards. The listing below, "with an empty DATA DIVISION", was tested using GNU/Linux and the System/370 Hercules emulator running MVS 3.8J. The JCL, written in July 2015, In the 1970s, adoption of the structured programming paradigm was becoming increasingly widespread. Edsger Dijkstra, a preeminent computer scientist, wrote a letter to the editor of Communications of the ACM, published 1975 entitled "How do we tell truths that might hurt?", in which he was critical of COBOL and several other contemporary languages; remarking that "the use of COBOL cripples the mind". In a published dissent to Dijkstra's remarks, the computer scientist Howard E. Tompkins claimed that unstructured COBOL tended to be "written by programmers that have never had the benefit of structured COBOL taught well", arguing that the issue was primarily one of training. One cause of spaghetti code was the statement. Attempts to remove s from COBOL code, however, resulted in convoluted programs and reduced code quality. s were largely replaced by the statement and procedures, which promoted modular programming and gave easy access to powerful looping COBOL was intended to be a highly portable, "common" language. However, by 2001, around 300 dialects had been created. One source of dialects was the standard itself: the 1974 standard was composed of one mandatory nucleus and eleven functional modules, each containing two or three levels of support. This permitted 104,976 official variants. COBOL syntax has often been criticized for its verbosity. Proponents say that this was intended to make the code self-documenting, easing program maintenance. COBOL was also intended to be easy for programmers to learn and use, while still being readable to non-technical staff such as managers. The desire for readability led to the use The COBOL community has always been isolated from the computer science community. No academic computer scientists participated in the design of COBOL: all of those on the committee came from commerce or government. Computer scientists at the time were more interested in fields like numerical analysis, physics and system programming than the commercial file-processing problems which COBOL development tackled. Jean Sammet attributed COBOL's unpopularity to an initial "snob reaction" due to its inelegance, the lack of influential computer scientists participating in the design process and a disdain for business data processing. The COBOL specification used a unique "notation", or metalanguage, to define its syntax rather than the new Backus–Naur form which the committee did not know of. This resulted in "severe" criticism. Later, COBOL suffered from a shortage of material covering it; it Doubts have been raised about the competence of the standards committee. Short-term committee member Howard Bromberg said that there was "little control" over the development process and that it was "plagued by discontinuity of personnel and... a lack of talent." Jean Sammet and Jerome Garfunkel also noted that changes introduced in one revision of the standard would be reverted COBOL's data structures influenced subsequent programming languages. Its record and file structure influenced PL/I and Pascal, and the codice_32 clause was a predecessor to Pascal's variant records. Explicit file structure definitions preceded the development of database management systems and aggregated data was a significant advance over Fortran's arrays. codice_16
COBOL (; an acronym for "common business-oriented language") is a compiled English-like computer programming language designed for business use. It is imperative, procedural and, since 2002, object-oriented. COBOL is primarily used in business, finance, and administrative systems for companies and governments. COBOL is still widely used in applications deployed on mainframe computers, such as large-scale batch and transaction processing jobs. But due to its declining popularity and the retirement of experienced COBOL programmers, programs are being migrated to new platforms, rewritten in modern languages or replaced with software packages. Most programming in COBOL is now purely to maintain existing applications, however many large financial institutions were still developing new systems in COBOL in 2006 due to the mainframe processing speed.
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summarize: Historically, stars have been important to civilizations throughout the world. They have been part of religious practices and used for celestial navigation and orientation. Many ancient astronomers believed that stars were permanently affixed to a heavenly sphere and that they were immutable. By convention, astronomers grouped stars into constellations and used them to track the motions of the planets and the inferred position of the Sun. The motion of the Sun against the background stars (and the horizon) was used to create calendars, which could be used to regulate agricultural practices. The Gregorian calendar, currently used nearly everywhere in the world, is a solar calendar based on the angle of the Earth's rotational axis relative to its local star, the Sun. The oldest accurately dated star chart was the result of ancient Egyptian astronomy in 1534 BC. The earliest known star catalogues were compiled by the ancient Babylonian astronomers of Mesopotamia in the late 2nd millennium BC, during the Kassite Period (c. 1531–1155 BC). The first star catalogue in Greek astronomy was created by Aristillus in approximately 300 BC, with the help of Timocharis. The star catalog of Hipparchus (2nd century BC) included 1020 stars, and was used to assemble Ptolemy's star catalogue. Hipparchus is known for the discovery of the first recorded "nova" (new star). Many of the constellations and star names in use today derive from Greek astronomy. In spite of the apparent immutability of the heavens, Chinese astronomers were aware that new stars could appear. In 185 AD, they were the first to observe and write about a supernova, now known as the SN 185. The brightest stellar event in recorded history was the SN 1006 supernova, which was observed in 1006 and written about by the Egyptian astronomer Ali ibn Ridwan and several Chinese astronomers. The SN 1054 supernova, which gave birth to the Crab Nebula, was also observed by Chinese and Islamic astronomers. Medieval Islamic astronomers gave Arabic names to many stars that are still used today and they invented numerous astronomical instruments that could compute the positions of the stars. They built the first large observatory research institutes, mainly for the purpose of producing "Zij" star catalogues. Among these, the "Book of Fixed Stars" (964) was written by the Persian astronomer Abd al-Rahman al-Sufi, who observed a number of stars, star clusters (including the Omicron Velorum and Brocchi's Clusters) and galaxies (including the Andromeda Galaxy). According to A. Zahoor, in the 11th century, the Persian polymath scholar Abu Rayhan Biruni described the Milky Way galaxy as a multitude of fragments having the properties of nebulous stars, and also gave the latitudes of various stars during a lunar eclipse in 1019. According to Josep Puig, the Andalusian astronomer Ibn Bajjah proposed that the Milky Way was made up of many stars that almost touched one another and appeared to be a continuous image due to the effect of refraction from sublunary material, citing his observation of the conjunction of Jupiter and Mars on 500 AH (1106/1107 AD) as evidence. Early European astronomers such as Tycho Brahe identified new stars in the night sky (later termed "novae"), suggesting that the heavens were not immutable. In 1584, Giordano Bruno suggested that the stars were like the Sun, and may have other planets, possibly even Earth-like, in orbit around them, an idea that had been suggested earlier by the ancient Greek philosophers, Democritus and Epicurus, and by medieval Islamic cosmologists such as Fakhr al-Din al-Razi. By the following century, the idea of the stars being the same as the Sun was reaching a consensus among astronomers. The concept of a constellation was known to exist during the Babylonian period. Ancient sky watchers imagined that prominent arrangements of stars formed patterns, and they associated these with particular aspects of nature or their myths. Twelve of these formations lay along the band of the ecliptic and these became the basis of astrology. Many of the more prominent individual stars were also given names, particularly with Arabic or Latin designations. As well as certain constellations and the Sun itself, individual stars have their own myths. To the Ancient Greeks, some "stars", known as planets (Greek πλανήτης (planētēs), meaning "wanderer"), represented various important deities, from which the names of the planets Mercury, Venus, Mars, Jupiter and Saturn were taken. (Uranus and Neptune were also Greek and Roman gods, but neither planet was known in Antiquity because of their low brightness. Their names were assigned by later astronomers.) Circa Although stellar parameters can be expressed in SI units or CGS units, it is often most convenient to express mass, luminosity, and radii in solar units, based on the characteristics of the Sun. In 2015, the IAU defined a set of "nominal" solar values (defined as SI constants, without uncertainties) which can be used for quoting stellar parameters: The solar mass M was not explicitly defined by the IAU due to the large relative uncertainty (10) of the Newtonian gravitational constant G. However, since the product of the Newtonian gravitational constant and solar mass together (GM) has been determined to much Stars condense from regions of space of higher matter density, yet those regions are less dense than within a vacuum chamber. These regions—known as "molecular clouds"—consist mostly of hydrogen, with about 23 to 28 percent helium and a few percent heavier elements. One example of such a star-forming region is the Orion Nebula. Most stars form in groups of dozens to hundreds of thousands of stars. Massive stars in these groups may powerfully illuminate those clouds, ionizing the hydrogen, and creating H II regions. Such feedback effects, from star formation, may ultimately disrupt the cloud and prevent further star formation. All stars spend the majority of their existence as "main sequence stars", fueled primarily by the nuclear fusion of hydrogen into helium within their cores. However, stars of different masses have markedly different properties at various stages of their development. The ultimate fate of more massive stars differs from that of less massive stars, as do their luminosities and the impact they have on their environment. Accordingly, astronomers often group stars by their mass: The formation of a star begins with gravitational instability within a molecular cloud, caused by regions of higher density—often triggered by compression of clouds by radiation from massive stars, expanding bubbles in the interstellar medium, the collision of different molecular clouds, or the collision of galaxies (as in a starburst galaxy). When a region reaches a sufficient density of matter to satisfy the criteria for Jeans instability, it begins to collapse under its own gravitational force. As the cloud collapses, individual conglomerations of dense dust and gas form "Bok globules". As a globule collapses and the density increases, the gravitational energy converts into heat and the temperature rises. When the protostellar cloud has approximately reached the stable condition of hydrostatic equilibrium, a protostar forms at the core. These pre-main-sequence stars are often surrounded by a protoplanetary disk and powered mainly by the conversion of gravitational energy. The period of gravitational contraction lasts about 10 to 15 Stars spend about 90% of their existence fusing hydrogen into helium in high-temperature and high-pressure reactions near the core. Such stars are said to be on the main sequence, and are called dwarf stars. Starting at zero-age main sequence, the proportion of helium in a star's core will steadily increase, the rate of nuclear fusion at the core will slowly increase, as will the star's temperature and luminosity. The Sun, for example, is estimated to have increased in luminosity by about 40% since it reached the main sequence 4.6 billion (4.6 × 10) years ago. Every star generates a stellar wind of particles that causes a continual outflow of gas into space. For most stars, the mass lost is negligible. The Sun loses 10 every year, or about 0.01% of its total mass over its entire lifespan. However, very massive stars can lose 10 to 10 each year, significantly affecting their evolution. Stars that begin with more than 50 can lose over half their total mass while on the main sequence. The time a star spends on the main sequence depends primarily on the amount of As stars of at least 0.4 exhaust their supply of hydrogen at their core, they start to fuse hydrogen in a shell outside the helium core. Their outer layers expand and cool greatly as they form a red giant. In about 5 billion years, when the Sun enters the helium burning phase, it will expand to a maximum radius of roughly, 250 times its present size, and lose 30% of its current mass. As the hydrogen shell burning produces more helium, the core increases in mass and temperature. In a red giant of up to 2.25, the mass of the helium During their helium-burning phase, a star of more than 9 solar masses expands to form first a blue and then a red supergiant. Particularly massive stars may evolve to a Wolf-Rayet star, characterised by spectra dominated by emission lines of elements heavier than hydrogen, which have reached the surface due to strong convection and intense mass loss. When helium is exhausted at the core of a massive star, the core contracts and the temperature and pressure rises enough to fuse carbon (see Carbon-burning process). As a star's core shrinks, the intensity of radiation from that surface increases, creating such radiation pressure on the outer shell of gas that it will push those layers away, forming a planetary nebula. If what remains after the outer atmosphere has been shed is less than roughly 1.4, it shrinks to a relatively tiny object about the size of Earth, known as a white dwarf. White dwarfs lack the mass for further gravitational compression to take place. The electron-degenerate matter inside a white dwarf is no longer a plasma, even though stars are generally referred to as being spheres of plasma. Eventually, white dwarfs fade into black dwarfs over a very long period of time. In massive stars, fusion continues until the iron core has grown so large (more than 1.4 ) that it can no longer support its own mass. This core will suddenly collapse as The post–main-sequence evolution of binary stars may be significantly different from the evolution of single stars of the same mass. If stars in a binary system are sufficiently close, when one of the stars expands to become a red giant it may overflow its Roche lobe, the region around a star where material is gravitationally bound to that star, leading to transfer of material to the other. When the Roche lobe is violated, a variety of phenomena can result, including contact binaries, common-envelope binaries, cataclysmic variables, and type Ia supernovae. Stars are not spread uniformly across the universe, but are normally grouped into galaxies along with interstellar gas and dust. A typical galaxy contains hundreds of billions of stars, and there are more than 2 trillion (10) galaxies. Overall, there are as many as an estimated stars (more stars than all the grains of sand on planet Earth). While it is often believed that stars only exist within galaxies, intergalactic stars have been discovered. A multi-star system consists of two or more gravitationally bound stars that orbit each other. The simplest and most common multi-star system is a binary star, but systems of three or more stars are also found. For reasons of orbital stability, such multi-star systems are often organized into hierarchical sets of binary stars. Larger groups called star clusters also exist. These range from loose stellar associations with only a few stars, up to enormous globular clusters with hundreds of thousands of stars. Such systems orbit their Almost everything about a star is determined by its initial mass, including such characteristics as luminosity, size, evolution, lifespan, and its eventual fate. Most stars are between 1 billion and 10 billion years old. Some stars may even be close to 13.8 billion years old—the observed age of the universe. The oldest star yet discovered, HD 140283, nicknamed Methuselah star, is an estimated 14.46 ± 0.8 billion years old. (Due to the uncertainty in the value, this age When stars form in the present Milky Way galaxy they are composed of about 71% hydrogen and 27% helium, as measured by mass, with a small fraction of heavier elements. Typically the portion of heavy elements is measured in terms of the iron content of the stellar atmosphere, as iron is a common element and its absorption lines are relatively easy to measure. The portion of heavier elements Due to their great distance from the Earth, all stars except the Sun appear to the unaided eye as shining points in the night sky that twinkle because of the effect of the Earth's atmosphere. The Sun is also a star, but it is close enough to the Earth to appear as a disk instead, and to provide daylight. Other than the Sun, the star with the largest apparent size is R Doradus, with an angular diameter of only 0.057 arcseconds. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding galaxy. The components of motion of a star consist of the radial velocity toward or away from the Sun, and the traverse angular movement, which is called its proper motion. Radial velocity is measured by the doppler shift of the star's spectral lines, and is given in units of km/s. The proper motion of a star, its parallax, is determined by precise astrometric measurements in The magnetic field of a star is generated within regions of the interior where convective circulation occurs. This movement of conductive plasma functions like a dynamo, wherein the movement of electrical charges induce magnetic fields, as does a mechanical dynamo. Those magnetic fields have a great range that extend throughout and beyond the star. The strength of the magnetic field varies with the mass and composition of the star, and the amount of magnetic surface activity depends upon the star's rate of rotation. This surface activity produces starspots, which are regions of strong magnetic fields and lower than normal surface temperatures. Coronal One of the most massive stars known is Eta Carinae, which, with 100–150 times as much mass as the Sun, will have a lifespan of only several million years. Studies of the most massive open clusters suggests as an upper limit for stars in the current era of the universe. This represents an empirical value for the theoretical limit on the mass of forming stars due to increasing radiation pressure on the accreting gas cloud. Several stars in the R136 cluster in the Large Magellanic Cloud have been measured with larger masses, but it has been determined that they could have been created through the collision and merger of massive stars in close binary systems, sidestepping the 150 limit on massive star formation. The first stars to form after the Big Bang may have been larger, up to 300, due to the complete absence of elements heavier than lithium in The rotation rate of stars can be determined through spectroscopic measurement, or more exactly determined by tracking their starspots. Young stars can have a rotation greater than 100 km/s at the equator. The B-class star Achernar, for example, has an equatorial velocity of about 225 km/s or greater, causing its equator to bulge outward and giving it an equatorial diameter that is more than 50% greater than between the poles. This rate of rotation is just below the critical velocity of 300 km/s at which speed the star would break apart. By contrast, the Sun rotates once every 25–35 days depending on The surface temperature of a main sequence star is determined by the rate of energy production of its core and by its radius, and is often estimated from the star's color index. The temperature is normally given in terms of an effective temperature, which is the temperature of an idealized black body that radiates its energy at the same luminosity per surface area as the star. Note that the effective temperature is only a representative of the surface, The energy produced by stars, a product of nuclear fusion, radiates to space as both electromagnetic radiation and particle radiation. The particle radiation emitted by a star is manifested as the stellar wind, which streams from the outer layers as electrically charged protons and alpha and beta particles. Although almost massless, there also exists a steady stream of neutrinos emanating from the star's core. The production of energy at the core is the reason stars shine so brightly: every time two or more atomic nuclei fuse together to form a single atomic nucleus of a new heavier element, gamma ray photons are released from the nuclear fusion product. This energy is converted to other forms of electromagnetic energy of lower frequency, such as visible light, by the time it reaches the star's outer layers. The color of a star, as determined by the most intense frequency of the visible light, depends on the temperature of the star's outer layers, including its photosphere. Besides visible light, stars also emit forms of electromagnetic radiation that are invisible to the human eye. In fact, stellar electromagnetic radiation spans the entire electromagnetic spectrum, from the longest wavelengths of radio waves through infrared, visible light, ultraviolet, to the shortest of X-rays, and gamma rays. From the standpoint of total energy emitted by a star, not all components of stellar electromagnetic radiation are significant, but all frequencies provide insight into the star's physics. Using the stellar spectrum, astronomers can also determine the surface temperature, surface gravity, metallicity and rotational velocity of a star. If the distance of the star is found, such as by measuring the parallax, then the luminosity of the star can be derived. The mass, radius, surface gravity, and rotation period can then be estimated based on stellar models. (Mass can be calculated for stars in binary systems by measuring their orbital velocities and distances. Gravitational microlensing has been used to measure the mass of a single star.) With these parameters, astronomers can also estimate the age of the star. The luminosity of a star is the amount of light and other forms of radiant energy it radiates per unit of time. It has units of power. The luminosity of a star is determined by its radius and surface temperature. Many stars do not radiate uniformly across their entire surface. The rapidly rotating star Vega, for example, has a higher The apparent brightness of a star is expressed in terms of its apparent magnitude. It is a function of the star's luminosity, its distance from Earth, the extinction effect of interstellar dust and gas, and the altering of the star's light as it passes through Earth's atmosphere. Intrinsic or absolute magnitude is directly related to a star's luminosity, and is what the apparent magnitude a star would be if the distance between the Earth and the star were 10 parsecs (32.6 light-years). Both the apparent and absolute magnitude scales are logarithmic units: one whole number difference in magnitude is equal to a brightness variation of about 2.5 times (the 5th root of 100 or approximately 2.512). This means that a first magnitude star (+1.00) is about 2.5 times brighter than a second magnitude (+2.00) star, and about 100 times brighter than a sixth magnitude star (+6.00). The faintest stars visible to the naked eye under good seeing conditions are about magnitude +6. On both apparent and absolute magnitude scales, the smaller the magnitude number, the brighter the star; the larger the magnitude number, the fainter the star. The The current stellar classification system originated in the early 20th century, when stars were classified from "A" to "Q" based on the strength of the hydrogen line. It was thought that the hydrogen line strength was a simple linear function of temperature. Instead, it was more complicated: it strengthened with increasing temperature, peaked near 9000 K, and then declined at greater temperatures. The classifications were since reordered by temperature, on which the modern scheme is based. Stars are given a single-letter classification according to their spectra, ranging from type "O", which are very hot, to "M", which are so cool that molecules may form in their atmospheres. The main classifications in order of decreasing surface temperature are: "O, B, A, F, G, K", and "M". A variety of rare spectral types are given special classifications. The most common of these are types "L" and "T", which classify Variable stars have periodic or random changes in luminosity because of intrinsic or extrinsic properties. Of the intrinsically variable stars, the primary types can be subdivided into three principal groups. During their stellar evolution, some stars pass through phases where they can become pulsating variables. Pulsating variable stars vary in radius and luminosity over time, expanding and contracting with periods ranging from minutes to years, depending on the size of the star. This category includes Cepheid and Cepheid-like stars, and long-period variables such as Mira. Eruptive variables are stars that experience sudden increases in luminosity because of flares The interior of a stable star is in a state of hydrostatic equilibrium: the forces on any small volume almost exactly counterbalance each other. The balanced forces are inward gravitational force and an outward force due to the pressure gradient within the star. The pressure gradient is established by the temperature gradient of the plasma; the outer part of the star is cooler than the core. The temperature at the core of a main sequence or giant star is at least on the order of 10 K. The resulting temperature and pressure at the hydrogen-burning core of a main sequence star are sufficient for nuclear fusion to occur and for sufficient energy to be produced to prevent further collapse of the star. As atomic nuclei are fused in the core, they emit energy in the form of gamma rays. These photons interact with the surrounding plasma, adding to the thermal energy at the core. Stars on the main sequence convert hydrogen into helium, creating a slowly but steadily increasing proportion of helium in the core. Eventually the helium content becomes predominant, and energy production ceases at the core. Instead, for stars of more than 0.4, fusion occurs in a slowly expanding shell around the degenerate helium core. In addition to hydrostatic equilibrium, the interior of a stable star will also maintain an energy balance of thermal equilibrium. There is a radial temperature gradient throughout the interior that results in a flux of energy flowing toward the exterior. The outgoing flux of energy leaving any layer within the star will exactly match the incoming flux from below. The radiation zone is the region of the stellar interior where A variety of nuclear fusion reactions take place in the cores of stars, that depend upon their mass and composition. When nuclei fuse, the mass of the fused product is less than the mass of the original parts. This lost mass is converted to electromagnetic energy, according to the mass–energy equivalence relationship "E" = "mc". The hydrogen fusion process is temperature-sensitive, so a moderate increase in the core temperature will result in a significant increase in the fusion rate. As a result, the core temperature of main sequence stars only varies from 4 million kelvin for a small M-class star to 40 million kelvin for a massive O-class star. In the Sun, with a 10-million-kelvin core, hydrogen fuses to form helium in the proton–proton chain reaction: These reactions result in the overall reaction: where e is a positron, γ is a gamma ray photon, ν is a neutrino, and H and He are isotopes of hydrogen and helium, respectively. The energy released by this reaction is in millions of electron volts, which is actually only a tiny amount of energy. However enormous numbers of these reactions occur constantly, producing all the energy necessary to sustain the star's radiation output. In comparison, the combustion of two hydrogen gas molecules with one oxygen gas molecule releases only 5.7 eV. In more massive stars, helium is produced in a cycle of reactions catalyzed by carbon called the carbon-nitrogen-oxygen cycle. In evolved stars with cores at 100 million kelvin and masses between 0.5 and 10, helium can be transformed into carbon in the triple-alpha process that uses the intermediate element beryllium: For an overall reaction of: In massive stars, heavier elements can also be burned in a contracting core through the neon-burning process and oxygen-burning process. The final stage in the stellar nucleosynthesis process is the silicon-burning process that results in the production of the stable isotope iron-56. Any further fusion would be an endothermic process that consumes energy, and so further energy can only be produced through gravitational collapse. The table at the left shows the amount of time required for a star of 20 to consume all of its nuclear fuel. As an O-class main sequence star, it would be 8 times the solar radius and 62,000 times the Sun's luminosity.
A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, the brightest of which gained proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable Universe contains an estimated stars, but most are invisible to the naked eye from Earth, including all stars outside our galaxy, the Milky Way.
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130
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summarize: During Greek and Roman times, boys were educated by their mothers until the age of seven, then according to the culture of their location and times, would start a formal education. In Sparta until twelve, it would be at a military academy building up physical fitness and combat skills, but also reading, writing and arithmetic while in Athens the emphasis would be on understanding the laws of the polis, reading, writing, arithmetic and music with gymnastics and athletics, and learning the moral stories of Homer. Girls received all their education at home. In Rome the primary school was called the "ludus"; the curriculum developed over the centuries featuring the learning of both Latin and Greek. In AD 94, Quintilian published the systematic educational work, "Institutio oratoria". He distinguished between teaching and learning, and that a child aged between 7 and 14 learned by sense experience, learns to form ideas, develops language and memory. He recommended that teachers should motivate their pupils by making the teaching interesting, rather than by corporal punishment. The trivium (grammar, rhetoric and logic) and quadrivium (arithmetic, geometry, astronomy and music) were legacies of the Roman curriculum. As the Roman influence waned the great cathedral schools were established to provide a source of choristers and clergy. Kings School, Canterbury dates from 597. The Council of Rome in 853 specified that each parish should provide elementary education: religious ritual but also reading and writing Latin. The purpose of education was pass on salvation not social change. The church had a monopoly on education and the feudal lords concurred and allowed their sons to be educated at the few church schools. The economy was agrarian and the children of serfs started work as soon as they were able. It was a truth that man was created by God in the image of Adam with his share of original sin and a boy was born sinful. Only the teaching of the church and the sacraments could redeem him. The parishes provide elementary education- but had no requirement to provide it to every child. The need was to produce priests, and in a stable kingdom such as that of Charlemagne, administrators with elementary writing skills in Latin and the arithmetic needed to collect taxes and administer them. Alcuin (735–804) developed teaching material that were based on the catechetical method- repeating and memorizing questions and answers, though often not understanding. These skills were also needed in the great abbeys such as Cluny. There was a divergence between the needs of town and monasteries and we see the development of parish, chantry, monastic and cathedral schools. With the entry of women into church life, convents were established and with them convent schools. Girls entered here at the age of eight and were taught Latin grammar, religious doctrine and music, and the women's arts of spinning, weaving, tapestry, painting and embroidery. Bede entered the monastic school at Jarrow at the age of seven and became a writer and historian. Chantry schools were the result of a charitable donations and educated the poor. Parishes had to have a school from 804, and cathedrals had to establish schools after the Lateran Council of 1179. Elementary education was mainly to teach the Latin needed for the trivium and the quadrivium that formed the basis of the secondary curriculum. While Humanism had a great change on the secondary curriculum, the primary curriculum was unaffected. It was believed that by studying the works of the greats, ancients who had governed empires, one became fit to succeed in any field. Renaissance boys from the age of five learned Latin grammar using the same books as the Roman child. There were the grammars of Donatus and Priscian followed by "Caesar's Commentaries" and then St Jerome's Latin Vulgate. Wealthy boys were educated by tutors. Others were educated in schools attached to the parishes, cathedrals or abbeys. From the 13th century, wealthy merchants endowed money for priests to "establish as school to teach grammar". These early grammar schools were to teach basic, or elementary grammar, to boys. No age limit was specified. Early examples in England included Lancaster Royal Grammar School, Royal Latin School, Buckingham, and Stockport Grammar School. The Reformation and the Dissolution of the Monasteries (1548) disrupted the funding of many schools. The schools petitioned the King, Edward VI, for an endowment. Examples of schools receiving endowments are King Edward VI Grammar School, Louth, King Edward VI Grammar School, Norwich and King Edward VI School, Stratford-upon-Avon, where William Shakespeare was thought to be pupil from the age of 7 to 14. Though the Grammar schools which were set up to deliver elementary education, they did require their entrants to already have certain skills. In particular, they expected them to be able to read and write in the vernacular. There was a need for something more basic. This was addressed by Dame schools, then charity schools, often set up by the churches (C of E schools), Bell's British Schools and Joseph Lancaster's National Schools. Certain movements in education had a relevance in all of Europe and its diverging colonies. The Americans were interested in the thoughts of Pestalozzi, Joseph Lancaster, Owen and the Prussian schools. Within the English speaking world, there are three widely used systems to describe the age of the child. The first is the "equivalent ages", then countries that base their education systems on the "English model" use one of two methods to identify the year group, while countries that base their systems on the "American K–12 model" refer to their year groups as "grades". Canada also follows the American model, although its names for year groups are put the number after the grade: For instance, "Grade 1" in Canada, rather than "First Grade" in the United States. This terminology extends into research literature. In Canada, education is a Provincial, not a Federal responsibility. For example, the province of Ontario also had a "Grade 13," designed to help students enter the workforce or post-secondary education, but this was phased out in the year 2003. In most parts of the world, primary education is the first stage of compulsory education, and is normally available without charge, but may also be offered by fee-paying independent schools. The term grade school is sometimes used in the US, although this term may refer to both primary education and secondary education. The term "primary school" is derived from the French "école primaire", which was first used in an English text in 1802. In the United Kingdom, "elementary education" was taught in "elementary schools" until 1944, when free elementary education was proposed for students over 11: there were to be primary elementary schools and secondary elementary schools; these became known as primary schools and secondary schools. In some parts of the United States, "primary school" refers to a school covering kindergarten through to second grade or third grade (K through 2 or 3); the "elementary school" includes grade three through five or grades four to six. In Canada, "elementary school" almost everywhere refers to Grades 1 through 6; with Kindergarten being referred to as "preschool." Though often used as a synonym, "elementary school" has specific meanings in different locations. School building design does not happen in isolation. The building (or school campus) needs to accommodate: Each country will have a different education system and priorities. Schools need to accommodate students, staff, storage, mechanical and electrical systems, storage, support staff, ancillary staff and administration. The number of rooms required can be determined from the predicted roll of the school and the area needed. According to standards used in the United Kingdom, a general classroom for 30 reception class or infant (Keystage 1) students needs to be 62 m, or 55 m for juniors (Keystage 2). Examples are given on how this can be configured for a 210 place primary with attached 26 place nursery and two-storey 420 place (two form entry) primary school with attached 26 place nursery. The building providing the education has to fulfil the needs of: The students, the teachers, the non-teaching support staff, the administrators and the community. It has to meet general government building guidelines, health requirements, minimal functional requirements for classrooms, toilets and showers, electricity and services, preparation and storage of textbooks and basic teaching aids. An optimum school will meet the minimum conditions and will have: Government accountants having read the advice then publish minimum guidelines on schools. These enable environmental modelling and establishing building costs. Future design plans are audited to ensure that these standards are met but not exceeded. Government ministries continue to press for the'minimum' space and cost standards to be reduced. The UK government published this downwardly revised space formula for primary schools in 2014. It said the floor area should be 350 m + 4.1 m/pupil place. The external finishes were to be downgraded to meet a build cost of £1113/m. There are three main ways of funding a school: it can funded by the state through general taxation, it can be funded by a pressure group such as the mosque or the church, it can be funded by a charity or it can be funded by contributions from the parents or a combination of these methods. Day to day oversight of the school can through a board of governors, the pressure group or by the owner. The United Kingdom allowed most elementary education to be delivered in church schools whereas in France this was illegal as there is strict separation of church and state. This can be through informal assessment by the staff and governors such as in Finland, or by a state run testing regime such as Ofsted in the United Kingdom.
A primary school, junior school (in UK), elementary school or grade school (in US & Canada) is a school for children from about four to eleven years old, in which they receive [education in Primary|primary or elementary education]]. It can refer to both the physical structure (buildings) and the organisation. Typically it comes after preschool, and before secondary school.
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summarize: The domestic dog is the first species, and the only large carnivore, to have been domesticated. Over the past 200 years, dogs have undergone rapid phenotypic change and were formed into today's modern breeds due to artificial selection imposed by humans. These breeds can vary in size and weight from a teacup poodle to a giant mastiff. The skull, body, and limb proportions vary significantly between breeds, with dogs displaying more phenotypic diversity than can be found within the entire order of carnivores. Some breeds demonstrate outstanding skills in herding, retrieving, scent detection, and guarding, which demonstrates the functional and behavioral diversity of dogs. The first dogs were certainly wolflike, but the phenotypic changes that coincided with the dog–wolf genetic divergence are not known. In 2017, a study showed that 9,000 years ago the domestic dog was present at what is now Zhokhov Island, arctic north-eastern Siberia, which was connected to the mainland at that time. The dogs were selectively bred as either sled dogs or as hunting dogs, which implies that a sled dog standard and a hunting dog standard existed at that time. The optimal maximum size for a sled dog is based on thermo-regulation, and the ancient sled dogs were between. The same standard has been found in the remains of sled dogs from this region 2,000 ago and in the modern Siberian Husky breed standard. Other dogs were more massive at and appear to be dogs that had been crossed with wolves and used for polar-bear hunting. At death, the heads of the dogs had been carefully separated from their bodies by humans, probably for ceremonial reasons. Between 3,000 and 4,000 years ago greyhound-type dogs were depicted on pottery and paintings in Egypt and Western Asia. Mastiff-type dogs were kept for guarding and hunting, and short-legged dogs were also bred. Most modern dog breeds are the products of the controlled breeding practices of the Victorian era (1830-1900), and the accurate documenting of pedigrees with the establishment of the English Kennel Club in 1873 in imitation of other stud book registries for cattle and horses. Domestic dogs are the most variable of mammals. Strong artificial selection has developed around 450 globally recognized breeds. These breeds possess distinct morphological traits including body size, skull shape, tail phenotype, fur colour and fur type. They also possess behavioral traits including herding, guarding, and hunting, in addition to personality traits such as aggression, boldness, or hypersocial behavior. Most of these breeds were developed within the last 200 years using only small numbers of founders. As a result, the large phenotypic variation across dog breeds can be studied through the analysis with only a small number of genetic markers. "Ancient breed" is a term formerly, but no longer, used for a particular group of dog breeds by the American Kennel Club. These breeds were referred to as "ancient", as opposed to modern, breeds because historically it was believed their origins dated back more than 500 years. In 2004, a study looked at the microsatellites of 414 purebred dogs representing 85 breeds. The study found that dog breeds were so genetically distinct that 99% of individual dogs could be correctly assigned to their breed based on their genotype, indicating that breeding barriers (pure-bred breeding) have led to distinct genetic units. The study identified 9 breeds that could be represented on the branches of a phylogenetic tree which grouped together with strong statistical support and could be separated from the other breeds with a modern European origin. These 9 breeds had been referred to as "ancient breeds". The study found that the Pharaoh Hound and Ibizan Hound were not as old as once believed; rather, they had been recreated from combinations of other breeds, and that the Norwegian Elkhound grouped with the other European dogs despite reports of direct Scandinavian origins dating back 5,000 years. Dog types are broad categories of dogs based on form, function or style of work, lineage, or appearance. In contrast, modern dog breeds are particular breed standards, sharing a common set of heritable characteristics, determined by the kennel club that recognizes the breed. The spread of modern dog breeds has been difficult to resolve because many are the products of the controlled breeding practices of the Victorian era (1830–1900). In 2010, a study looked at 48,000 single nucleotide polymorphisms that gave a genome-wide coverage of 912 dogs representing 85 breeds. The study found distinct genetic clusters within modern dogs that largely corresponded to phenotype or function. These included spitz-breeds, toy dogs, spaniels, Mastiff-like breeds, small terriers, retrievers, herding dogs, scent-hounds, and sight-hounds. There were 17 breeds that conflicted with phenotype or function and these were thought to be the result of crossing some of the other phenotypes. As in a 2004 study that found 9 ‘ancient breeds’ to be genetically divergent, the study found 13 breeds that were genetically divergent from the modern breeds: the Basenji, Saluki, Afghan hound, Samoyed, Canaan dog, New Guinea singing dog, dingo, Chow Chow, Chinese Shar Pei, Akita, Alaskan malamute, Siberian husky and American Eskimo dog. Results also indicated that the Basenji had recent admixture with Middle Eastern wolves. The study found that there were three well-supported groups that were highly divergent and distinct from modern domestic dogs. In 2012, a study looked at 49,000 single nucleotide polymorphisms that gave a genome-wide coverage of 1,375 dogs representing 35 breeds, 19 wolves, and previous published genetic signatures of other breeds, giving a total of 121 breeds covered. The study found a deep genetic split between old-world and new-world wolves, and confirmed the genetic divergence of 13 breeds from a 2010 study (Afghan Hound, Akita, Alaskan Malamute, American Eskimo, Basenji, Canaan dog, Chow Chow, Dingo, New Guinea singing dog, Saluki, Samoyed, Shar-Pei, Siberian Husky), plus another three: the Eurasier, Finnish Spitz and Shiba Inu. The study referred to these 16 as basal breeds, as opposed to ancient breeds, as they exhibited genetic divergence but not all of them were historically considered to be "ancient breeds". The 2012 study found that modern breeds only emerged in the 19th century and that claims of their antiquity are based on little or no historical or empirical evidence. The study indicated that throughout history, global dog populations experienced numerous episodes of diversification and homogenization, with each round further reducing the power of genetic data derived from modern breeds to help infer their early history. Of the basal breeds, the American Eskimo Dog and Eurasier were the very recent product of cross-breeding other basal breeds. Most basal breeds have hybridized with other lineages in the past. If those other lineages were other basal breeds then a basal genetic signature remains. The combination of introgression and past population bottlenecks suggested that basal breeds have little or no genetic connections to their ancestral populations and that their genetic distinctiveness does not signify ancient heritage. They are distinctive from the modern breeds because the genetic heritage of the modern breeds has become blurred due to admixture, and the basal breeds have mostly avoided admixture with them due to geographic or cultural barriers. As dogs are a subspecies but their breeds are distinct genetic units, and because only certain breeds share the same type of cancers as humans, the differences in the genes of different breeds may be useful in human medical research. In 2014, a study indicated that some breed-temperaments, such as anxiety or fear, may be linked to gene mutations. Other temperaments may be due to the legacies of 'ancient' ancestry. Groups of owners that have dogs of the same breed and have an interest in dog breeding can form national Kennel clubs. Kennel Clubs maintain breed standards, record pedigrees in a breed registry (or studbook), and issue the rules for conformation dog shows and trials and accreditation of judges. They often serve as registries, which are lists of adult purebred dogs and lists of litters of puppies born to purebred parents. A dog breed is represented by a sufficient number of individuals to stably transfer its specific characteristics over generations. Dogs of same breed have similar characteristics of appearance and behavior, primarily because they come from a select set of ancestors who had the same characteristics. Dogs of a specific breed breed true, producing young that are very similar to their parents. An individual dog is identified as a member of a breed through proof of ancestry, using genetic analysis or written records of ancestry. Without such proof, identification of a specific breed is not reliable. Such records, called stud books, may be maintained by individuals, clubs, or other organizations. Kennel clubs provide the recognition of distinct dog breeds, but there are many independent clubs with differing, and sometimes inconsistent standards and they need not apply scientific standards. Four varieties of the Belgian Shepherd Dog are recognised as four distinct breeds by the New Zealand Kennel Club. Further, some groups of dogs which clearly share a persistent set of characteristics and documented descent from a known foundation stock may still not be recognized by some clubs as breeds. For instance, the feist is a hunting dog raised in the Southern United States for hunting small game. Feists have a consistent set of characteristics that reliably differentiate them from other dog types and breeds. However, the United Kennel Club recognizes one breed of feist, the Treeing Feist, while the American Kennel Club does not recognize any feist breed. A dog is said to be purebred if their parents were purebred and if the dog meets the standards of the breed. Purebred dog breeders of today "have inherited a breeding paradigm that is, at the very least, a bit anachronistic in light of modern genetic knowledge, and that first arose out of a pretty blatant misinterpretation of Darwin and an enthusiasm for social theories that have long been discredited as scientifically insupportable and morally questionable." The American Kennel Club allows mixed-breed dogs to be shown but under the condition the animals have been spayed or neutered, are not a wolf hybrid, and not eligible for the AKC Foundation Stock Service Program or an AKC Purebred Alternative Listing (PAL). California Assembly Act AB 1634 was a bill introduced in 2007 that would require all non-working dogs of mixed breed over the age of 6 months to be neutered or spayed. The bill was morally controversial, leading the American Kennel Club to fight the bill. The Canadian department of agriculture has strict standards for the documenting of what it calls "evolving breeds". The breed standard for each breed of dog is a detailed description of the appearance and behaviour of an idealized dog of that breed. Included in the breed standard description are externally observable aspects of appearance and behaviour that are considered by the breed club to be the most important for the breed, and externally observable details of appearance or temperament that are considered by the breed club to be unacceptable (called "faults"). In addition, most breed standards include a historical section, describing the place of origin and the original work done by the breed or its ancestor types. Dogs with a breed standard may be accepted into one or more of the major registries (kennel clubs) of dog breeds, including the Fédération Cynologique Internationale (formed 1911, covering 98 countries), The Kennel Club (1873, UK), American Kennel Club (1884), New Zealand Kennel Club (1886), Canadian Kennel Club (1888), United Kennel Club (1898), United Kennel Clubs International (UCI, Germany 1976), Australian National Kennel Council (1958), and other national breed registries. Recognized dog breeds are classified by groups, such as Hound, Terrier, Working, Herding, Sporting, Non-Sporting, Toy and Miscellaneous; some groups may be further subdivided by some registries. Purebred dogs have more health problems than mongrel dogs, and require more veterinary visits, and tend to have lower longevity. Indeed, studies have reported lifespans that are shorter by between one and almost two years. Notably, dog breeds with flat faces and short noses have breathing difficulties, eye trouble and other health issues. The Fédération Cynologique Internationale recognizes over 300 dog breeds. A dog crossbreed is the result of mating two different breeds. "Designer Dog" became a fad in the late 20th century. A mongrel, mixed-breed dog or mutt is a dog that does not belong to one officially recognized breed and is not the result of intentional breeding. Natural breeds rose through time in response to a particular environment and in isolation from other populations of the species. This environment included humans but with little or no selective breeding by humans.
A dog breed is a particular strain or dog type that was purposefully bred by humans to perform specific tasks, such as herding, hunting, and guarding. When distinguishing breed from type, the rule of thumb is that a breed always "breeds true". Dogs are the most variable mammal on earth, with artificial selection producing around 450 globally recognized dog breeds. These breeds possess distinct traits related to morphology, which include body size, skull shape, tail phenotype, fur type and coat colour. Their behavioural traits include guarding, herding, and hunting, and personality traits such as hypersocial behavior, boldness, and aggression. Most breeds were derived from small numbers of founders within the last 200 years. As a result, today dogs are the most abundant carnivore species and are dispersed around the world.
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summarize: Chytilová was born in Ostrava, Czechoslovakia, on 2 February 1929. She had a strict Catholic upbringing, which would later come to influence many of the moral questions presented in her films. While attending college, Chytilová initially studied philosophy and architecture, but abandoned these fields. She then worked as a draftsman, a fashion model and as a photo re-toucher before working as a clapper girl for the Barrandov Film Studios in Prague. She then sought a recommendation from Barrandov Film Studios to study film production, but was denied. Undeterred by the rejection, she would later be accepted into the Film and TV School of the Academy of Performing Arts in Prague (FAMU) at the age of 28. While attending FAMU, she studied underneath renowned film director Otakar Vavra, before graduating in 1962. Upon graduation from FAMU both of Chytilová's short films had a theatrical release throughout Czechoslovakia. In 1963 Chytilová released her first feature film entitled "Something Different". Chytilová is best known for her once highly controversial film "Sedmikrásky" ("Daisies") – (1966). "Daisies" is known for its un-sympathetic characters, lack of a continuous narrative and abrupt visual style. Chytilová states that she structured "Daisies" to “restrict [the spectator’s] feeling of involvement and lead him to an understanding of the underlying idea or philosophy”. The film was banned within Czechoslovakia upon its initial release in 1966 until 1967 due to its depictions and imagery of wasting food, but in 1966 the film won the Grand Prix at the Bergamo Film Festival in Italy. "Daisies" cemented Chytilová's career both nationally and internationally. After "Daisies" the government made it very difficult for Chytilová to find work within Czechoslovakia, even though she was never officially classified as a 'blacklisted' director. Her follow-up film "Ovoce stromů rajských jíme" ("Fruit of Paradise", 1969) was her last film before the Soviet Union invasion of 1968. After the Soviet Union invasion it was virtually impossible for Chytilová to find work and she resorted to directing commercials under her husband's name, Jaroslav Kučera. In 1976, due to the low cinema attendance Chytilová was approached by the government to begin directing films through one of the state run production companies,. At the same time the United States was assembling a 'Year of Women' Film Festival and contacted Chytilová to gain permission to screen "Daisies" as their opening film. Chytilová informed the festival that the only non-censored prints of the film could be found in Paris and Brussels. She also informed the festival that her government would not allow her to attend the festival, nor were they allowing her to direct films. The festival then began to apply international pressure upon the Czechoslovakian government by petitioning on Chytilová's behalf. In accordance with this international pressure, Chytilová wrote a letter directly to President Gustáv Husák detailing her career and her personal beliefs in socialism. Due to the success of the international pressure, and Chytilová's personal appeal to President Husak, Chytilová began production of "Hra o jablko" ("The Apple Game", 1976). "The Apple Game" was completed and then was screened at the Karlovy Vary International Film Festival, and won the Silver Hugo and the Chicago International Film Festival. After the release of "The Apple Game" Chytilová was allowed to continue making films, but was continually met with controversy and heavy censorship by the Czechoslovak government. Věra Chytilová's last film was released in 2006, and she has taught directing at FAMU. Chytilová described herself as a control freak and, “An overheated kettle that you can’t turn down”. Chytilová's ‘overheated’ attitude made it difficult for her to gain work within the Soviet Union controlled film industry. She was known as being actively critical of the Soviet Union, stating that “My critique is in the context of the moral principles you preach, isn’t it? A critical reflection is necessary”. She would routinely cause havoc and ‘hysterical scenes’ in order to attempt to make films that were loyal to her vision regardless of the heavy censorship that was routinely imposed. Chytilová embodied a unique cinematographic language and style that does not rely on any literary or verbal conventions, but rather utilizes various forms of visual manipulations to create meaning within her films. Chytilová used observations of everyday life in accordance with allegories and surreal contexts to create a personalized film style that is greatly influenced by the French New Wave, and Italian neorealism. Chytilová actively used a filmic style that is similar to cinéma vérité in order to allow the audience to gain an outside perspective of the film. Her use of cinéma vérité is best illustrated in her 1966 film "Daises" in which these techniques create a “philosophical documentary, of diverting the spectator from the involvement, destroying psychology and accentuates the humor”. Through these manipulations Chytilová created a disjunctive viewing experience for her audience forcing them to question the meaning of her films. Chytilová is cited as a militant feminist filmmaker. Josef Škvorecký states that, “In a true feminist tradition Vera combined intensive intellectual effort with a feminine feeling for beauty and form”. "Daisies" is seen as a feminist film due to its attitude and active critique of male attitudes towards sex. However Chytilová did not see herself as a feminist filmmaker, but rather believes in individualism, stating that if a person does not believe in a particular set of conventions or rules then it is up to that individual to break them. Chytilová was born in Ostrava, Czechoslovakia, on 2 February 1929. She refused to leave Czechoslovakia after the Soviet Union Invasion of 1968 stating that “Making films then became a mission”. She married cinematographer Jaroslav Kučera whom she met while attending FAMU. During the Soviet Union occupation, when Chytilová could not find work as a director, she and her husband built their family home and raised their children. Chytilová died on 12 March 2014 in Prague, surrounded by her family, after long-term health issues. She was 85.
Věra Chytilová (2 February 1929 – 12 March 2014) was an avant-garde Czech film director and pioneer of Czech cinema. Banned by the Czechoslovak government in the 1960s, she is best known for her Czech New Wave film, "Sedmikrásky" ("Daisies"). Her subsequent films screened at international film festivals, including "Vlčí bouda" (1987), which screened at the 37th Berlin International Film Festival, "A Hoof Here, a Hoof There" (1989), which screened at the 16th Moscow International Film Festival, and "The Inheritance or Fuckoffguysgoodday" (1992), which screened at the 18th Moscow International Film Festival. For her work, she received the Ordre des Arts et des Lettres, Medal of Merit and the Czech Lion award.
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summarize: The word "comedy" is derived from the Classical Greek κωμῳδία "kōmōidía", which is a compound of κῶμος "kômos" (revel) and ᾠδή "ōidḗ" (singing; ode). The adjective "comic" (Greek κωμικός "kōmikós)," which strictly means that which relates to comedy is, in modern usage, generally confined to the sense of "laughter-provoking". Of this, the word came into modern usage through the Latin "comoedia" and Italian "commedia" and has, over time, passed through various shades of meaning. The Greeks and Romans confined their use of the word "comedy" to descriptions of stage-plays with happy endings. Aristotle defined comedy as an imitation of men worse than the average (where tragedy was an imitation of men better than the average). However, the characters portrayed in comedies were not worse than average in every way, only insofar as they are Ridiculous, which is a species of the Ugly. The Ridiculous may be defined as a mistake or deformity not productive of pain or harm to others; the mask, for instance, that excites laughter is something ugly and distorted without causing pain. In the Middle Ages, the term expanded to include narrative poems with happy endings. It is in this sense that Dante used the term in the title of his poem, "La Commedia". As time progressed, the word came more and more to be associated with any sort of performance intended to cause laughter. During the Middle Ages, the term "comedy" became synonymous with satire, and later with humour in general. Aristotle's "Poetics" was translated into Arabic in the medieval Islamic world, where it was elaborated upon by Arabic writers and Islamic philosophers, such as Abu Bishr, and his pupils Al-Farabi, Avicenna, and Averroes. They disassociated comedy from Greek dramatic representation and instead identified it with Arabic poetic themes and forms, such as "hija" (satirical poetry). They viewed comedy as simply the "art of reprehension", and made no reference to light and cheerful events, or to the troubling beginnings and happy endings associated with classical Greek comedy. After the Latin translations of the 12th century, the term "comedy" gained a more general meaning in medieval literature. In the late 20th century, many scholars preferred to use the term "laughter" to refer to the whole gamut of the comic, in order to avoid the use of ambiguous and problematically defined genres such as the grotesque, irony, and satire. Starting from 425 BCE, Aristophanes, a comic playwright and satirical author of the Ancient Greek Theater, wrote 40 comedies, 11 of which survive. Aristophanes developed his type of comedy from the earlier satyr plays, which were often highly obscene. The only surviving examples of the satyr plays are by Euripides, which are much later examples and not representative of the genre. In ancient Greece, comedy originated in bawdy and ribald songs or recitations apropos of phallic processions and fertility festivals or gatherings. Around 335 BCE, Aristotle, in his work "Poetics", stated that comedy originated in phallic processions and the light treatment of the otherwise base and ugly. He also adds that the origins of comedy are obscure because it was not treated seriously from its inception. However, comedy had its own Muse: Thalia. Aristotle taught that comedy was generally positive for society, since it brings forth happiness, which for Aristotle was the ideal state, the final goal in any activity. For Aristotle, a comedy did not need to involve sexual humor. A comedy is about the fortunate rise of a sympathetic character. Aristotle divides comedy into three categories or subgenres: farce, romantic comedy, and satire. On the contrary, Plato taught that comedy is a destruction to the self. He believed that it produces an emotion that overrides rational self-control and learning. In "The Republic", he says that the guardians of the state should avoid laughter, "for ordinarily when one abandons himself to violent laughter, his condition provokes a violent reaction." Plato says comedy should be tightly controlled if one wants to achieve the ideal state. Also in "Poetics", Aristotle defined comedy as one of the original four genres of literature. The other three genres are tragedy, epic poetry, and lyric poetry. Literature, in general, is defined by Aristotle as a mimesis, or imitation of life. Comedy is the third form of literature, being the most divorced from a true mimesis. Tragedy is the truest mimesis, followed by epic poetry, comedy, and lyric poetry. The genre of comedy is defined by a certain pattern according to Aristotle's definition. Comedies begin with low or base characters seeking insignificant aims and end with some accomplishment of the aims which either lightens the initial baseness or reveals the insignificance of the aims. The "Divine Comedy" ( ) is a long narrative poem by Dante Alighieri, begun c. 1308 and completed in 1320, a year before his death in 1321. It is widely considered to be the preeminent work in Italian literature and one of the greatest works of world literature. The poem's imaginative vision of the afterlife is representative of the medieval world-view as it had developed in the Western Church by the 14th century. It helped establish the Tuscan language, in which it is written, as the standardized Italian language. It is divided into three parts: "Inferno", "Purgatorio", and "Paradiso". The narrative describes Dante's travels through Hell, Purgatory, and Paradise or Heaven, while allegorically the poem represents the soul's journey towards God. Dante draws on medieval Christian theology and philosophy, especially Thomistic philosophy and the "Summa Theologica" of Thomas Aquinas. Consequently, the "Divine Comedy" has been called "the "Summa" in verse". In Dante's work, Virgil is presented as human reason and Beatrice is presented as divine knowledge. The work was originally simply titled "Comedia" (so also in the first printed edition, published in 1472). The adjective "Divina" was added by Giovanni Boccaccio, and the first edition to name the poem "Divina Comedia" in the title was that of the Venetian humanist Lodovico Dolce, published in 1555 by Gabriele Giolito de' Ferrari. The "Divine Comedy" is composed of 14,233 lines that are divided into three "cantiche" (singular "cantica") – "Inferno" (Hell), "Purgatorio" (Purgatory), and "Paradiso" (Paradise) – each consisting of 33 cantos (Italian plural "canti"). An initial canto, serving as an introduction to the poem and generally considered to be part of the first "cantica", brings the total number of cantos to 100. It is generally accepted, however, that the first two cantos serve as a unitary prologue to the entire epic, and that the opening two cantos of each "cantica" serve as prologues to each of the three "cantiche". "Comedy", in its Elizabethan usage, had a very different meaning from modern comedy. A Shakespearean comedy is one that has a happy ending, usually involving marriages between the unmarried characters, and a tone and style that is more light-hearted than Shakespeare's other plays. The Punch and Judy show has roots in the 16th-century Italian commedia dell'arte. The figure of Punch derives from the Neapolitan stock character of Pulcinella. The figure who later became Mr. Punch made his first recorded appearance in England in 1662. Punch and Judy are performed in the spirit of outrageous comedy — often provoking shocked laughter — and are dominated by the anarchic clowning of Mr. Punch. Appearing at a significant period in British history, professor Glyn Edwards states: "[Pulcinella] went down particularly well with Restoration British audiences, fun-starved after years of Puritanism. We soon changed Punch's name, transformed him from a marionette to a hand puppet, and he became, really, a spirit of Britain — a subversive maverick who defies authority, a kind of puppet equivalent to our political cartoons." In early 19th century England, pantomime acquired its present form which includes slapstick comedy and featured the first mainstream clown Joseph Grimaldi, while comedy routines also featured heavily in British music hall theatre which became popular in the 1850s. British comedians who honed their skills in music hall sketches include Charlie Chaplin, Stan Laurel and Dan Leno. English music hall comedian and theatre impresario Fred Karno developed a form of sketch comedy without dialogue in the 1890s, and Chaplin and Laurel were among the comedians who worked for his company. Karno was a pioneer of slapstick, and in his biography, Laurel stated, "Fred Karno didn't teach Charlie [Chaplin] and me all we know about comedy. He just taught us most of it". Film producer Hal Roach stated: "Fred Karno is not only a genius, he is the man who originated slapstick comedy. We in Hollywood owe much to him." American vaudeville emerged in the 1880s and remained popular until the 1930s, and featured comedians such as W. C. Fields, Buster Keaton and the Marx Brothers. Surreal humour (also known as 'absurdist humour'), or'surreal comedy', is a form of humour predicated on deliberate violations of causal reasoning, producing events and behaviours that are obviously illogical. Constructions of surreal humour tend to involve bizarre juxtapositions, incongruity, non-sequiturs, irrational or absurd situations and expressions of nonsense. The humour arises from a subversion of audience's expectations, so that amusement is founded on unpredictability, separate from a logical analysis of the situation. The humour derived gets its appeal from the ridiculousness and unlikeliness of the situation. The genre has roots in Surrealism in the arts. Surreal humour is the effect of illogic and absurdity being used for humorous effect. Under such premises, people can identify precursors and early examples of surreal humour at least since the 19th century, such as Lewis Carroll's "Alice's Adventures in Wonderland" and "Through the Looking-Glass", which both use illogic and absurdity (hookah-smoking caterpillars, croquet matches using live flamingos as mallets, etc.) for humorous effect. Many of Edward Lear's children stories and poems contain nonsense and are basically surreal in approach. For example, "The Story of the Four Little Children Who Went Round the World" (1871) is filled with contradictory statements and odd images intended to provoke amusement, such as the following: In the early 20th century, several avant-garde movements, including the dadaists, surrealists, and futurists, began to argue for an art that was random, jarring and illogical. The goals of these movements were in some sense serious, and they were committed to undermining the solemnity and self-satisfaction of the contemporary artistic establishment. As a result, much of their art was intentionally amusing. A famous example is Marcel Duchamp's "Fountain" (1917), an inverted urinal signed "R. Mutt". This became one of the most famous and influential pieces of art in history, and one of the earliest examples of the found object movement. It is also a joke, relying on the inversion of the item's function as expressed by its title as well as its incongruous presence in an art exhibition. The advent of cinema in the late 19th century, and later radio and television in the 20th century broadened the access of comedians to the general public. Charlie Chaplin, through silent film, became one of the best-known faces on Earth. The silent tradition lived on well into the 20th century through mime artists like Marcel Marceau, and the physical comedy of artists like Rowan Atkinson as Mr. Bean. The tradition of the circus clown also continued, with such as Bozo the Clown in the United States and Oleg Popov in Russia. Radio provided new possibilities — with Britain producing the influential surreal humour of the Goon Show after the Second World War. The Goons' influence spread to the American radio and recording troupe the Firesign Theatre. American cinema has produced a great number of globally renowned comedy artists, from Laurel and Hardy, the Three Stooges, Abbott and Costello, Dean Martin and Jerry Lewis, as well as Bob Hope during the mid-20th century, to performers like George Carlin, Robin Williams, and Eddie Murphy at the end of the century. Hollywood attracted many international talents like the British comics Peter Sellers, Dudley Moore and Sacha Baron Cohen, Canadian comics Dan Aykroyd, Jim Carrey, and Mike Myers, and the Australian comedian Paul Hogan, famous for "Crocodile Dundee". Other centres of creative comic activity have been the cinema of Hong Kong, Bollywood, and French farce. American television has also been an influential force in world comedy: with American series like "M*A*S*H", "Seinfeld" and "The Simpsons" achieving large followings around the world. British television comedy also remains influential, with quintessential works including "Fawlty Towers", Monty Python, "Dad's Army", "Blackadder", and "The Office". Australian satirist Barry Humphries, whose comic creations include the housewife and "gigastar" Dame Edna Everage, for his delivery of Dadaist and absurdist humour to millions, was described by biographer Anne Pender in 2010 as not only "the most significant theatrical figure of our time... [but] the most significant comedian to emerge since Charlie Chaplin". By 200 BC, in ancient Sanskrit drama, Bharata Muni's "Natya Shastra" defined humour ("hāsyam") as one of the nine "nava rasas", or principle "rasas" (emotional responses), which can be inspired in the audience by "bhavas", the imitations of emotions that the actors perform. Each "rasa" was associated with a specific "bhavas" portrayed on stage. In the case of humour, it was associated with mirth ("hasya"). The phenomena connected with laughter and that which provokes it have been carefully investigated by psychologists. They agree the predominant characteristics are incongruity or contrast in the object and shock or emotional seizure on the part of the subject. It has also been held that the feeling of superiority is an essential factor: thus Thomas Hobbes speaks of laughter as a "sudden glory". Modern investigators have paid much attention to the origin both of laughter and of smiling, as well as the development of the "play instinct" and its emotional expression. George Meredith said that "One excellent test of the civilization of a country... I take to be the flourishing of the Comic idea and Comedy, and the test of true Comedy is that it shall awaken thoughtful laughter." Laughter is said to be the cure for being sick. Studies show that people who laugh more often get sick less. American literary theorist Kenneth Burke writes that the "comic frame" in rhetoric is "neither wholly euphemistic, nor wholly debunking—hence it provides the charitable attitude towards people that is required for purposes of persuasion and co-operation, but at the same time maintains our shrewdness concerning the simplicities of ‘cashing in.’" The purpose of the comic frame is to satirize a given circumstance and promote change by doing so. The comic frame makes fun of situations and people, while simultaneously provoking thought. The comic frame does not aim to vilify in its analysis, but rather, rebuke the stupidity and foolery of those involved in the circumstances. For example, on "The Daily Show", Jon Stewart uses the "comic frame" to intervene in political arguments, often offering crude humor in sudden contrast to serious news. In a segment on President Obama's trip to China Stewart remarks on America's debt to the Chinese government while also having a weak relationship with the country. After depicting this dismal situation, Stewart shifts to speak directly to President Obama, calling upon him to "shine that turd up." For Stewart and his audience, introducing coarse language into what is otherwise a serious commentary on the state of foreign relations serves to frame the segment comically, creating a serious tone underlying the comedic agenda presented by Stewart. Comedy may be divided into multiple genres based on the source of humor, the method of delivery, and the context in which it is delivered. The different forms of comedy often overlap, and most comedy can fit into multiple genres. Some of the subgenres of comedy are farce, comedy of manners, burlesque, and satire. Some comedy apes certain cultural forms: for instance, parody and satire often imitate the conventions of the genre they are parodying or satirizing. For example, in the United States, parodies of newspapers and television news include "The Onion", and "The Colbert Report"; in Australia, shows such as "Kath & Kim," "Utopia", and "Shaun Micallef's Mad As Hell" perform the same role. Self-deprecation is a technique of comedy used by many comedians who focus on their misfortunes and foibles in order to entertain. Stand-up comedy is a mode of comic performance in which the performer addresses the audience directly, usually speaking in their own person rather than as a dramatic character.
In a modern sense, comedy (from the, "kōmōidía") is a genre of fiction that refers to any discourse or work generally intended to be humorous or amusing by inducing laughter, especially in theatre, television, film, stand-up comedy, books or any other medium of entertainment. The origins of the term are found in Ancient Greece. In the Athenian democracy, the public opinion of voters was influenced by the political satire performed by the comic poets at the theaters. The theatrical genre of Greek comedy can be described as a dramatic performance which pits two groups or societies against each other in an amusing agon or conflict. Northrop Frye depicted these two opposing sides as a "Society of Youth" and a "Society of the Old." A revised view characterizes the essential agon of comedy as a struggle between a relatively powerless youth and the societal conventions that pose obstacles to his hopes. In this struggle, the youth is understood to be constrained by his lack of social authority, and is left with little choice but to take recourse in ruses which engender very dramatic irony which provokes laughter.
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summarize: Gold is the most malleable of all metals. It can be drawn into a monoatomic wire, and then stretched about twice before it breaks. Such nanowires distort via formation, reorientation and migration of dislocations and crystal twins without noticeable hardening. A single gram of gold can be beaten into a sheet of 1 square meter, and an avoirdupois ounce into 300 square feet. Gold leaf can be beaten thin enough to become semi-transparent. The transmitted light appears greenish blue, because gold strongly reflects yellow and red. Such semi-transparent sheets also strongly reflect infrared light, making them useful as infrared (radiant heat) shields in visors of heat-resistant suits, and in sun-visors for spacesuits. Gold is a good conductor of heat and electricity. Gold has a density of 19.3 g/cm, almost identical to that of tungsten at 19.25 g/cm; as such, tungsten has been used in counterfeiting of gold bars, such as by plating a tungsten bar with gold, or taking an existing gold bar, drilling holes, and replacing the removed gold with tungsten rods. By comparison, the density of lead is 11.34 g/cm, and that of the densest element, osmium, is. Whereas most metals are gray or silvery white, gold is slightly reddish-yellow. This color is determined by the frequency of plasma oscillations among the metal's valence electrons, in the ultraviolet range for most metals but in the visible range for gold due to relativistic effects affecting the orbitals around gold atoms. Similar effects impart a golden hue to metallic caesium. Common colored gold alloys include the distinctive eighteen-karat rose gold created by the addition of copper. Gold has only one stable isotope,, which is also its only naturally occurring isotope, so gold is both a mononuclidic and monoisotopic element. Thirty-six radioisotopes have been synthesized, ranging in atomic mass from 169 to 205. The most stable of these is with a half-life of 186.1 days. The least stable is, which decays by proton emission with a half-life of 30 μs. Most of gold's radioisotopes with atomic masses below 197 decay by some combination of proton The production of gold from a more common element, such as lead, has long been a subject of human inquiry, and the ancient and medieval discipline of alchemy often focused on it; however, the transmutation of the chemical elements did not become possible until the understanding of nuclear physics in the 20th century. The first synthesis of gold was conducted by Japanese physicist Hantaro Nagaoka, who synthesized gold from mercury in 1924 by neutron bombardment. An American team, working without knowledge of Nagaoka's prior study, conducted the same experiment in 1941, achieving the same result and showing that the isotopes of gold produced by Although gold is the most noble of the noble metals, it still forms many diverse compounds. The oxidation state of gold in its compounds ranges from −1 to +5, but Au(I) and Au(III) dominate its chemistry. Au(I), referred to as the aurous ion, is the most common oxidation state with soft ligands such as thioethers, thiolates, and tertiary phosphines. Au(I) compounds are typically linear. A good example is Au(CN), which is the soluble form of gold encountered in mining. The binary gold halides, such as AuCl, form zigzag polymeric chains, again featuring linear coordination at Au. Most drugs based on gold are Au(I) derivatives. Au(III) (referred to as the auric) is a common oxidation state, and is illustrated by gold(III) chloride, AuCl. The gold atom centers in Au(III) complexes, like other d compounds, are typically square planar, with chemical bonds that have both covalent and ionic character. Gold does not react with oxygen at any temperature and, up to 100 °C, is resistant to attack from ozone. Some free halogens react with gold. Gold is strongly attacked by fluorine at dull-red heat to form gold(III) fluoride. Powdered gold reacts with chlorine at 180 °C to form AuCl. Gold reacts with bromine at 140 °C to form gold(III) bromide, but reacts only very slowly with iodine to form the monoiodide. Gold does not react with sulfur directly, but gold(III) sulfide can be made by passing hydrogen sulfide through a dilute solution of gold(III) chloride or chlorauric acid. Gold readily dissolves in mercury at room temperature to form an amalgam, and forms alloys with many other metals at higher temperatures. These alloys can be produced to modify the hardness and other metallurgical properties, to control melting point or to create exotic colors. Gold is unaffected by most acids. It does not react with hydrofluoric, hydrochloric, hydrobromic, hydriodic, sulfuric, or nitric acid. It does react with selenic acid, and is dissolved by aqua regia, a 1:3 mixture of nitric acid and hydrochloric acid. Nitric acid oxidizes the metal to +3 ions, but only in minute amounts, typically undetectable in the pure acid because of the chemical equilibrium of the reaction. However, the ions are removed from the equilibrium by hydrochloric acid, forming AuCl ions, or chloroauric acid, thereby enabling further oxidation. Gold is similarly unaffected by most bases. It does not react with aqueous, solid, or molten sodium or potassium hydroxide. It does however, react with sodium or potassium cyanide under alkaline conditions when oxygen is present to form soluble complexes. Common oxidation states of gold include +1 (gold(I) or aurous compounds) and +3 (gold(III) or auric compounds). Gold ions in solution are readily reduced and precipitated as metal by adding any other metal as the reducing agent. The added metal is oxidized and dissolves, allowing the gold to be displaced from solution and be recovered as a solid precipitate. Gold is thought to have been produced in supernova nucleosynthesis, and from the collision of neutron stars, and to have been present in the dust from which the Solar System formed. Traditionally, gold in the universe is thought to have formed by the r-process (rapid neutron capture) in supernova nucleosynthesis, but more recently it has been suggested that gold and other elements heavier than iron may also be produced in quantity by the r-process Because the Earth was molten when it was formed, almost all of the gold present in the early Earth probably sank into the planetary core. Therefore, most of the gold that is in the Earth's crust and mantle has in one model thought to have been delivered to Earth later, by asteroid impacts during the Late Heavy Bombardment, about 4 billion years ago. Gold which is reachable by humans has, in one case, been associated with a particular asteroid impact. The asteroid that formed Vredefort crater 2.020 billion years ago is often credited with seeding the Witwatersrand basin Notwithstanding the impact above, much of the rest of the gold on Earth is thought to have been incorporated into the planet since its very beginning, as planetesimals On Earth, gold is found in ores in rock formed from the Precambrian time onward. It most often occurs as a native metal, typically in a metal solid solution with silver (i.e. as a gold silver alloy). Such alloys usually have a silver content of 8–10%. Electrum is elemental gold with more than 20% silver. Electrum's color runs from golden-silvery to silvery, dependent upon the silver content. The more silver, the lower the specific gravity. Native gold occurs as very small to microscopic particles embedded in rock, often together with quartz or sulfide minerals such as "fool's gold", which is a pyrite. These are called lode deposits. The metal in a native state is also found in the form of free flakes, grains or larger nuggets that have been eroded from rocks and end up in alluvial deposits called placer deposits. Such free gold is always richer at the surface of gold-bearing veins owing to the oxidation of accompanying minerals followed by weathering, and washing of the dust into streams and rivers, where it collects and can be welded by water action to form nuggets. Gold sometimes occurs combined with tellurium as the minerals calaverite, krennerite, nagyagite, petzite and sylvanite (see telluride minerals), and as the rare bismuthide maldonite (AuBi) and antimonide aurostibite (AuSb). Gold also occurs in rare alloys with copper, lead, and mercury: the minerals auricupride (CuAu), novodneprite (AuPb) and weishanite ((Au, Ag)Hg). Recent research suggests that microbes can sometimes play an important role in forming gold deposits, transporting and precipitating gold to form grains and nuggets that collect in alluvial deposits. Another recent study has claimed water in faults vaporizes during an earthquake, depositing gold. When an earthquake strikes, it moves along a fault. Water often lubricates faults, filling in fractures and jogs. About 6 miles (10 kilometers) below the surface, under incredible temperatures and pressures, the water carries high concentrations of carbon dioxide, silica, and gold. During an earthquake, the fault jog suddenly opens wider. The water inside the void instantly vaporizes, flashing to steam and forcing silica, which forms the mineral quartz, and gold out of the fluids and onto nearby surfaces. The world's oceans contain gold. Measured concentrations of gold in the Atlantic and Northeast Pacific are 50–150 femtomol/L or 10–30 parts per quadrillion (about 10–30 g/km). In general, gold concentrations for south Atlantic and central Pacific samples are the same (~50 femtomol/L) but less certain. Mediterranean deep waters contain slightly higher concentrations of gold (100–150 femtomol/L) attributed to wind-blown dust and/or rivers. At 10 parts per quadrillion the Earth's oceans would hold 15,000 tonnes of gold. These figures are three orders of magnitude less than reported in the The earliest recorded metal employed by humans appears to be gold, which can be found free or "native". Small amounts of natural gold have been found in Spanish caves used during the late Paleolithic period, c. 40,000 BC. Gold artifacts made their first appearance at the very beginning of the pre-dynastic period in Egypt, at the end of the fifth millennium BC and the start of the fourth, and smelting was developed during the course of the 4th millennium; gold artifacts appear in the archeology of Lower Mesopotamia during the early 4th millennium. Gold artifacts in the Balkans appear from the 4th millennium BC, such as those found in the Varna Necropolis near Lake Varna in Bulgaria, thought by one source (La Niece 2009) to be the earliest "well-dated" find of gold artifacts. As of 1990, gold artifacts found at the Wadi Qana cave cemetery of the 4th millennium BC in West Bank were the earliest from the Levant. Gold artifacts such as the golden hats and the Nebra disk appeared in Central Europe from the 2nd millennium BC Bronze Age. The oldest known map of a gold mine was drawn in the 19th Dynasty of Ancient Egypt (1320–1200 BC), whereas the first written reference to gold was recorded in the 12th Dynasty around 1900 BC. Egyptian hieroglyphs from as early as 2600 BC describe gold, which King Tushratta of the Mitanni claimed was "more plentiful than dirt" in Egypt. Egypt and especially Nubia had the resources to make them major gold-producing areas for much of history. One of the earliest known maps, known as the Turin Papyrus Map, shows the plan of a gold mine in Nubia together with indications of the local geology. The primitive working methods are described by both Strabo and Diodorus Siculus, and included fire-setting. Large mines were also present across the Red Sea in what is now Saudi Arabia. Gold is mentioned in the Amarna letters numbered 19 and 26 from around the 14th century BC. Gold is mentioned frequently in the Old Testament, starting with Genesis 2:11 (at Havilah), the story of the golden calf, and many parts of the temple including the Menorah and the golden altar. In the New Testament, it is included with the gifts of the magi in the first chapters of Matthew. The Book of Revelation 21:21 describes the city of New Jerusalem as having streets "made of pure gold, clear as crystal". Exploitation of gold in the south-east corner of the Black Sea is said to date from the time of Midas, and this gold was important in the establishment of what is probably the world's earliest coinage in Lydia around 610 BC. The legend of the golden fleece dating from eighth century BCE may refer to the use of fleeces to trap gold dust from placer deposits in the ancient world. From the 6th or 5th century BC, the Chu (state) circulated the Ying Yuan, one kind of square gold coin. In Roman metallurgy, new methods for extracting gold on a large scale were developed by introducing hydraulic mining methods, especially in Hispania from 25 BC onwards and in Dacia from 106 AD onwards. One of their largest mines was at Las Medulas in León, where seven long aqueducts enabled them to sluice most of a large alluvial deposit. The mines at Roşia Montană in Transylvania were also very large, and until very recently, still mined by opencast methods. They also exploited smaller deposits in Britain, such as placer and hard-rock deposits at Dolaucothi. The various methods they used are well described by Pliny the Elder in his encyclopedia "Naturalis Historia" written towards the end of the first century AD. During Mansa Musa's (ruler of the Mali Empire from 1312 to 1337) hajj to Mecca in 1324, he passed through Cairo in July 1324, and was reportedly accompanied by a camel train that included thousands of people and nearly a hundred camels where he gave away so much gold that it depressed the price in Egypt for over a decade, causing high inflation. A contemporary Arab historian remarked: The European exploration of the Americas was fueled in no small part by reports of the gold ornaments displayed in great profusion by Native American peoples, especially in Mesoamerica, Peru, Ecuador and Colombia. The Aztecs regarded gold as the product of the gods, calling it literally "god excrement" ("teocuitlatl" in Nahuatl), and after Moctezuma II was killed, most of this gold was shipped to Spain. However, for the indigenous peoples of North America gold was considered useless and they saw much greater value in other minerals which were directly related to their utility, such as obsidian, flint, and slate. El Dorado is applied to a legendary story in which precious stones were found in fabulous abundance along with gold coins. The concept of El Dorado underwent several transformations, and eventually accounts of the previous myth were also combined with those of a legendary lost city. El Dorado, was the term used by the Spanish Empire to describe a mythical tribal chief (zipa) of the Muisca native people in Colombia, who, as an initiation rite, covered himself with gold dust and submerged in Lake Guatavita. The legends surrounding El Dorado changed over time, as it went from being a man, to a city, to a kingdom, and then finally to an empire. Gold played a role in western culture, as a cause for desire and of corruption, as told in children's fables such as Rumpelstiltskin—where Rumpelstiltskin turns hay into gold for the peasant's daughter in return for her child when she becomes a princess—and the stealing of the hen that lays golden eggs in Jack and the Beanstalk. The top prize at the Olympic Games and many other sports competitions is the gold medal. 75% of the presently accounted for gold has been extracted since 1910. It has been estimated that the currently known amount of gold internationally would form a single cube 20 m (66 ft) on a side (equivalent to 8,000 m). One main goal of the alchemists was to produce gold from other substances, such as lead — presumably by the interaction with a mythical substance called the philosopher's stone. Although they never succeeded in this attempt, the alchemists did promote an interest in systematically finding out what can be done with substances, and this laid the foundation for today's chemistry. Their symbol for gold was the circle with a point at its center (☉), which was also the astrological symbol and the ancient Chinese character for the Sun. The Dome of the Rock is covered with an ultra-thin golden glassier. The Sikh Golden temple, the Harmandir Sahib, is a building covered with gold. Similarly the Wat Phra Kaew emerald Buddhist temple (wat) in Thailand has ornamental gold-leafed statues and roofs. Some European king and queen's crowns were made of gold, and gold was used for the bridal crown since antiquity. An ancient Talmudic text circa 100 AD describes Rachel, wife of Rabbi Akiva, receiving a "Jerusalem of Gold" (diadem). A Greek burial crown made of gold was found in a grave circa 370 BC. The World Gold Council states that as of the end of 2017, "there were 187,200 tonnes of stocks in existence above ground". This can be represented by a cube with an edge length of about 21 meters. At $1,349 per troy ounce, 187,200 metric tonnes of gold would have a value of $8.9 trillion. According to the United States Geological Survey in 2016, about of gold has been produced since the beginning of civilization, of which 85% remains in use. In 2017, the world's largest gold producer by far was China with 440 tonnes. The second-largest producer, Australia, mined 300 tonnes in the same year, followed by Russia with 255 tonnes. Since the 1880s, South Africa has been the source of a large proportion of the world's gold supply, and about 22% of the gold presently accounted is from South Africa. Production in 1970 accounted for 79% of the world supply, about 1,480 tonnes. In 2007 China (with 276 tonnes) overtook South Africa as the world's largest gold producer, the first time since 1905 that South Africa has not been the largest. , China was the world's leading gold-mining country, followed in order by Australia, Russia, the United States, Canada, and Peru. South Africa, which had dominated world gold production for most of the 20th century, had declined to sixth place. Other major producers are the Ghana, Burkina Faso, Mali, Indonesia and Uzbekistan. In South America, the controversial project Pascua Lama aims at exploitation of rich fields in the high mountains of Atacama Desert, at the border between Chile and Argentina. Today about one-quarter of the world gold output is estimated to originate from artisanal or small scale mining. The city of Johannesburg located in South Africa was founded as a result of the Witwatersrand Gold Rush which resulted Gold extraction is most economical in large, easily mined deposits. Ore grades as little as 0.5 parts per million (ppm) can be economical. Typical ore grades in open-pit mines are 1–5 ppm; ore grades in underground or hard rock mines are usually at least 3 ppm. Because ore grades of 30 ppm are usually needed before gold is visible to the naked eye, in most gold mines the gold is invisible. The average The consumption of gold produced in the world is about 50% in jewelry, 40% in investments, and 10% in industry. According to World Gold Council, China is the world's largest single consumer of Gold production is associated with contribution to hazardous pollution. Low-grade gold ore may contain less than one ppm gold metal; such ore is ground and mixed with sodium cyanide to dissolve the gold. Cyanide is a highly poisonous chemical, which can kill living creatures when exposed in minute quantities. Many cyanide spills from gold mines have occurred in both developed and developing countries which killed aquatic life in long stretches of affected rivers. Environmentalists consider these events major environmental disasters. Thirty tons of used ore is dumped as waste for producing one troy ounce of gold. Gold ore dumps are the source of many heavy elements such as cadmium, lead, Gold has been widely used throughout the world as money, for efficient indirect exchange (versus barter), and to store wealth in hoards. For exchange purposes, mints produce standardized gold bullion coins, bars and other units of fixed weight and purity. The first known coins containing gold were struck in Lydia, Asia Minor, around 600 BC. The "talent" coin of gold in use during the periods of Grecian history both before and during the time of the life of Homer weighed between 8.42 and 8.75 grams. From an earlier preference in using silver, European economies re-established the minting of gold as coinage during the thirteenth and fourteenth centuries. Bills (that mature into gold coin) and gold certificates (convertible into gold coin at the issuing bank) added to the circulating stock of gold standard money in most 19th century industrial economies. In preparation for World War I the warring nations moved to fractional gold standards, inflating their currencies to finance the war effort. Post-war, the victorious countries, most notably Britain, gradually restored gold-convertibility, but international flows of gold via bills of exchange remained embargoed; international shipments were made exclusively for bilateral trades or to pay war reparations. After World War II gold was replaced by a system of nominally convertible currencies related by fixed exchange rates following the Bretton Woods system. Gold standards and the direct convertibility of currencies to gold have been abandoned by world governments, led in 1971 by the United States' refusal to redeem its dollars in gold. Fiat currency now fills most monetary roles. Switzerland was the last country to tie its currency to gold; it backed 40% of its value until the Swiss joined the International Monetary Fund in 1999. Central banks continue to keep a portion of their liquid reserves as gold in some form, and metals exchanges such as the London Bullion Market Association still clear transactions denominated in gold, including future delivery contracts. Today, gold mining output is declining. With the sharp growth of economies in the 20th century, and increasing foreign exchange, the world's gold reserves and their trading market have become a small fraction of all markets and fixed exchange rates of currencies to gold have been replaced by floating prices for gold and gold future contract. Though the gold stock grows by only 1 or 2% per year, very little metal is irretrievably consumed. Inventory above ground would satisfy many decades of industrial and even artisan uses at current prices. The gold proportion (fineness) of alloys is measured by karat (k). Pure gold (commercially termed "fine" gold) is designated as 24 karat, abbreviated 24k. English gold coins intended for circulation from 1526 into the 1930s were typically a standard 22k alloy called crown gold, for hardness (American gold coins for circulation after 1837 contain an alloy of 0.900 fine gold, or 21.6 kt). Although the prices of some platinum group metals can be much higher, gold has long been considered the most desirable of precious metals, and its value has been used as the standard for many currencies. Gold has been used as a symbol for purity, value, royalty, and particularly roles that combine these properties. Gold as a sign of wealth and prestige was ridiculed by Thomas More in his treatise "Utopia". On that imaginary island, gold is so abundant that it is used to make chains for slaves, tableware, and lavatory seats. When ambassadors from other countries arrive, dressed in ostentatious gold jewels and badges, the Utopians mistake them for menial servants, paying homage instead to the most modestly dressed of their party. The ISO 4217 currency code of gold is XAU. Many holders of gold store it in form of bullion coins or bars as a hedge against inflation or other economic disruptions, though its efficacy as such has been questioned; historically, it has not proven itself reliable as a hedging instrument. Modern bullion coins for investment or collector purposes do not require good mechanical wear properties; they are typically fine gold at 24k, although the American Gold Eagle and the British gold sovereign continue to be minted in 22k (0.92) metal in historical tradition, and the South African Krugerrand, first released in 1967, is also 22k (0.92). The "special issue" Canadian Gold Maple Leaf coin contains the highest purity gold of any bullion coin, at 99.999% or 0.99999, while the "popular issue" Canadian Gold Maple Leaf coin has a purity of 99.99%. In 2006, the United States Mint began producing the American Buffalo gold bullion coin with a purity of 99.99%. The Australian Gold Kangaroos were first coined in 1986 as the Australian Gold Nugget but changed the reverse design in 1989. Other modern coins include the Austrian Vienna Philharmonic bullion coin and the Chinese Gold Panda. Because of the softness of pure (24k) gold, it is usually alloyed with base metals for use in jewelry, altering its hardness and ductility, melting point, color and other properties. Alloys with lower karat rating, typically 22k, 18k, 14k or 10k, contain higher percentages of copper or other base metals or silver or palladium in the alloy. Nickel is toxic, and its release from nickel white gold is controlled by legislation in Europe. Palladium-gold alloys are more expensive than those using nickel. High-karat white gold alloys are more resistant to corrosion than are either pure silver or sterling silver. The Japanese craft of Only 10% of the world consumption of new gold produced goes to industry, but by far the most important industrial use for new gold is in fabrication of corrosion-free electrical connectors in computers and other electrical devices. For example, according to the World Gold Council, a typical cell phone may contain 50 mg of gold, worth about 50 cents. But since nearly one billion cell phones are produced each year, a gold value of 50 cents in each phone adds to $500 million in gold from just this application. Though gold is attacked by free chlorine, its good conductivity and general resistance to oxidation and corrosion in other environments (including resistance to non-chlorinated acids) has led to its widespread industrial use in the electronic era as a thin-layer coating on electrical connectors, thereby ensuring good connection. For example, gold is used in the connectors of the more expensive electronics cables, such as audio, video and USB cables. Metallic and gold compounds have long been used for medicinal purposes. Gold, usually as the metal, is perhaps the most anciently administered medicine (apparently by shamanic practitioners) and known to Dioscorides. In medieval times, gold was often seen as beneficial for the health, in the belief that something so rare and beautiful could not be anything but healthy. Even some modern esotericists and forms of alternative medicine assign metallic gold a healing power. In the 19th century gold had a reputation as a "nervine", a therapy for nervous disorders. Depression, epilepsy, migraine, Pure metallic (elemental) gold is non-toxic and non-irritating when ingested and is sometimes used as a food decoration in the form of gold leaf. Metallic gold is also a component of the alcoholic drinks Goldschläger, Gold Strike, and Goldwasser. Metallic gold is approved as a food additive in the EU (E175 in the Codex Alimentarius). Although the gold ion is toxic, the acceptance of metallic gold as a food additive is due to its relative chemical inertness, and resistance to being corroded or transformed into soluble salts (gold compounds) by any known chemical process which would be encountered in the human body. Soluble compounds (gold salts) such as gold chloride are toxic to the liver and kidneys. Common cyanide salts of gold such as potassium gold cyanide, used in gold electroplating, are toxic by virtue of both their cyanide and gold content. There are rare cases of lethal gold poisoning from potassium gold cyanide. Gold toxicity can be ameliorated with chelation therapy with an agent such as dimercaprol. Gold metal was voted Allergen of the Year in 2001 by the American Contact Dermatitis Society; gold contact allergies affect mostly women. Despite this, gold is a relatively non-potent contact allergen, in comparison with metals like nickel. A sample of the fungus "Aspergillus niger" was found growing from gold mining solution; and was found to contain cyano metal complexes, such as gold, silver, copper, iron and zinc. The fungus also plays a role in the solubilization of heavy metal sulfides.
Gold is a chemical element with the symbol Au (from ) and atomic number 79, making it one of the higher atomic number elements that occur naturally. In a pure form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native) form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the native element silver (as electrum) and also naturally alloyed with copper and palladium. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides).
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summarize: Western drama originates in classical Greece. The theatrical culture of the city-state of Athens produced three genres of drama: tragedy, comedy, and the satyr play. Their origins remain obscure, though by the 5th century BC they were institutionalised in competitions held as part of festivities celebrating the god Dionysus. Historians know the names of many ancient Greek dramatists, not least Thespis, who is credited with the innovation of an actor (""hypokrites"") who speaks (rather than sings) and impersonates a character (rather than speaking in his own person), while interacting with the chorus and its leader (""coryphaeus""), who were a traditional part of the performance of non-dramatic poetry (dithyrambic, lyric and epic). Only a small fraction of the work of five dramatists, however, has survived to this day: we have a small number of complete texts by the tragedians Aeschylus, Sophocles and Euripides, and the comic writers Aristophanes and, from the late 4th century, Menander. Aeschylus' historical tragedy "The Persians" is the oldest surviving drama, although when it won first prize at the City Dionysia competition in 472 BC, he had been writing plays for more than 25 years. The competition (""agon"") for tragedies may have begun as early as 534 BC; official records (""didaskaliai"") begin from 501 BC when the satyr play was introduced. Tragic dramatists were required to present a tetralogy of plays (though the individual works were not necessarily connected by story or theme), which usually consisted of three tragedies and one satyr play (though exceptions were made, as with Euripides' "Alcestis" in 438 BC). Comedy was officially recognized with a prize in the competition from 487 to 486 BC. Five comic dramatists competed at the City Dionysia (though during the Peloponnesian War this may have been reduced to three), each offering a single comedy. Ancient Greek comedy is traditionally divided between "old comedy" (5th century BC), "middle comedy" (4th century BC) and "new comedy" (late 4th century to 2nd BC). Following the expansion of the Roman Republic (509–27 BC) into several Greek territories between 270–240 BC, Rome encountered Greek drama. From the later years of the republic and by means of the Roman Empire (27 BC-476 AD), theatre spread west across Europe, around the Mediterranean and reached England; Roman theatre was more varied, extensive and sophisticated than that of any culture before it. While Greek drama continued to be performed throughout the Roman period, the year 240 BC marks the beginning of regular Roman drama. From the beginning of the empire, however, interest in full-length drama declined in favour of a broader variety of theatrical entertainments. The first important works of Roman literature were the tragedies and comedies that Livius Andronicus wrote from 240 BC. Five years later, Gnaeus Naevius also began to write drama. No plays from either writer have survived. While both dramatists composed in both genres, Andronicus was most appreciated for his tragedies and Naevius for his comedies; their successors tended to specialise in one or the other, which led to a separation of the subsequent development of each type of drama. By the beginning of the 2nd century BC, drama was firmly established in Rome and a guild of writers ("collegium poetarum") had been formed. The Roman comedies that have survived are all "fabula palliata" (comedies based on Greek subjects) and come from two dramatists: Titus Maccius Plautus (Plautus) and Publius Terentius Afer (Terence). In re-working the Greek originals, the Roman comic dramatists abolished the role of the chorus in dividing the drama into episodes and introduced musical accompaniment to its dialogue (between one-third of the dialogue in the comedies of Plautus and two-thirds in those of Terence). The action of all scenes is set in the exterior location of a street and its complications often follow from eavesdropping. Plautus, the more popular of the two, wrote between 205 and 184 BC and twenty of his comedies survive, of which his farces are best known; he was admired for the wit of his dialogue and his use of a variety of poetic meters. All of the six comedies that Terence wrote between 166 and 160 BC have survived; the complexity of his plots, in which he often combined several Greek originals, was sometimes denounced, but his double-plots enabled a sophisticated presentation of contrasting human behaviour. No early Roman tragedy survives, though it was highly regarded in its day; historians know of three early tragedians—Quintus Ennius, Marcus Pacuvius, and Lucius Accius. From the time of the empire, the work of two tragedians survives—one is an unknown author, while the other is the Stoic philosopher Seneca. Nine of Seneca's tragedies survive, all of which are "fabula crepidata" (tragedies adapted from Greek originals); his "Phaedra", for example, was based on Euripides' "Hippolytus". Historians do not know who wrote the only extant example of the "fabula praetexta" (tragedies based on Roman subjects), "Octavia", but in former times it was mistakenly attributed to Seneca due to his appearance as a character in the tragedy. Beginning in the early Middle Ages, churches staged dramatised versions of biblical events, known as liturgical dramas, to enliven annual celebrations. The earliest example is the Easter trope "Whom do you Seek? (Quem-Quaeritis)" (c. 925). Two groups would sing responsively in Latin, though no impersonation of characters was involved. By the 11th century, it had spread through Europe to Russia, Scandinavia, and Italy; excluding Islamic-era Spain. In the 10th century, Hrosvitha wrote six plays in Latin modeled on Terence's comedies, but which treated religious subjects. Her plays are the first known to be composed by a female dramatist and the first identifiable Western drama of the post-Classical era. Later, Hildegard of Bingen wrote a musical drama, "Ordo Virtutum" (c. 1155). One of the most famous of the early secular plays is the courtly pastoral "Robin and Marion", written in the 13th century in French by Adam de la Halle. "The Interlude of the Student and the Girl" (c. 1300), one of the earliest known in English, seems to be the closest in tone and form to the contemporaneous French farces, such as "The Boy and the Blind Man." Many plays survive from France and Germany in the late Middle Ages, when some type of religious drama was performed in nearly every European country. Many of these plays contained comedy, devils, villains, and clowns. In England, trade guilds began to perform vernacular "mystery plays," which were composed of long cycles of many playlets or "pageants," of which four are extant: York (48 plays), Chester (24), Wakefield (32) and the so-called "N-Town" (42). "The Second Shepherds' Play" from the Wakefield cycle is a farcical story of a stolen sheep that its protagonist, Mak, tries to pass off as his new-born child asleep in a crib; it ends when the shepherds from whom he has stolen are summoned to the Nativity of Jesus. Morality plays (a modern term) emerged as a distinct dramatic form around 1400 and flourished in the early Elizabethan era in England. Characters were often used to represent different ethical ideals. "Everyman", for example, includes such figures as Good Deeds, Knowledge and Strength, and this characterisation reinforces the conflict between good and evil for the audience. "The Castle of Perseverance" (c. 1400—1425) depicts an archetypal figure's progress from birth through to death. "Horestes" (c. 1567), a late "hybrid morality" and one of the earliest examples of an English revenge play, brings together the classical story of Orestes with a Vice from the medieval allegorical tradition, alternating comic, slapstick scenes with serious, tragic ones. Also important in this period were the folk dramas of the Mummers Play, performed during the Christmas season. Court masques were particularly popular during the reign of Henry VIII. One of the great flowerings of drama in England occurred in the 16th and 17th centuries. Many of these plays were written in verse, particularly iambic pentameter. In addition to Shakespeare, such authors as Christopher Marlowe, Thomas Middleton, and Ben Jonson were prominent playwrights during this period. As in the medieval period, historical plays celebrated the lives of past kings, enhancing the image of the Tudor monarchy. Authors of this period drew some of their storylines from Greek mythology and Roman mythology or from the plays of eminent Roman playwrights such as Plautus and Terence. Restoration comedy refers to English comedies written and performed in England during the Restoration period from 1660 to 1710. Comedy of manners is used as a synonym of Restoration comedy. After public theatre had been banned by the Puritan regime, the re-opening of the theatres in 1660 with the Restoration of Charles II signalled a renaissance of English drama. Restoration comedy is known for its sexual explicitness, urbane, cosmopolitan wit, up-to-the-minute topical writing, and crowded and bustling plots. Its dramatists stole freely from the contemporary French and Spanish stage, from English Jacobean and Caroline plays, and even from Greek and Roman classical comedies, combining the various plotlines in adventurous ways. Resulting differences of tone in a single play were appreciated rather than frowned on, as the audience prized "variety" within as well as between plays. Restoration comedy peaked twice. The genre came to spectacular maturity in the mid-1670s with an extravaganza of aristocratic comedies. Twenty lean years followed this short golden age, although the achievement of the first professional female playwright, Aphra Behn, in the 1680s is an important exception. In the mid-1690s, a brief second Restoration comedy renaissance arose, aimed at a wider audience. The comedies of the golden 1670s and 1690s peak times are significantly different from each other. The unsentimental or "hard" comedies of John Dryden, William Wycherley, and George Etherege reflected the atmosphere at Court and celebrated with frankness an aristocratic macho lifestyle of unremitting sexual intrigue and conquest. The Earl of Rochester, real-life Restoration rake, courtier and poet, is flatteringly portrayed in Etherege's "The Man of Mode" (1676) as a riotous, witty, intellectual, and sexually irresistible aristocrat, a template for posterity's idea of the glamorous Restoration rake (actually never a very common character in Restoration comedy). The single play that does most to support the charge of obscenity levelled then and now at Restoration comedy is probably Wycherley's masterpiece "The Country Wife" (1675), whose title contains a lewd pun and whose notorious "china scene" is a series of sustained double entendres. During the second wave of Restoration comedy in the 1690s, the "softer" comedies of William Congreve and John Vanbrugh set out to appeal to more socially diverse audience with a strong middle-class element, as well as to female spectators. The comic focus shifts from young lovers outwitting the older generation to the vicissitudes of marital relations. In Congreve's "Love for Love" (1695) and "The Way of the World" (1700), the give-and-take set pieces of couples testing their attraction for one another have mutated into witty prenuptial debates on the eve of marriage, as in the latter's famous "Proviso" scene. Vanbrugh's "The Provoked Wife" (1697) has a light touch and more humanly recognisable characters, while "The Relapse" (1696) has been admired for its throwaway wit and the characterisation of Lord Foppington, an extravagant and affected burlesque fop with a dark side. The tolerance for Restoration comedy even in its modified form was running out by the end of the 17th century, as public opinion turned to respectability and seriousness even faster than the playwrights did. At the much-anticipated all-star première in 1700 of "The Way of the World", Congreve's first comedy for five years, the audience showed only moderate enthusiasm for that subtle and almost melancholy work. The comedy of sex and wit was about to be replaced by sentimental comedy and the drama of exemplary morality. The pivotal and innovative contributions of the 19th-century Norwegian dramatist Henrik Ibsen and the 20th-century German theatre practitioner Bertolt Brecht dominate modern drama; each inspired a tradition of imitators, which include many of the greatest playwrights of the modern era. The works of both playwrights are, in their different ways, both modernist and realist, incorporating formal experimentation, meta-theatricality, and social critique. In terms of the traditional theoretical discourse of genre, Ibsen's work has been described as the culmination of "liberal tragedy", while Brecht's has been aligned with an historicised comedy. Other important playwrights of the modern era include Antonin Artaud, August Strindberg, Anton Chekhov, Frank Wedekind, Maurice Maeterlinck, Federico García Lorca, Eugene O'Neill, Luigi Pirandello, George Bernard Shaw, Ernst Toller, Vladimir Mayakovsky, Arthur Miller, Tennessee Williams, Jean Genet, Eugène Ionesco, Samuel Beckett, Harold Pinter, Friedrich Dürrenmatt, Dario Fo, Heiner Müller, and Caryl Churchill. Western opera is a dramatic art form that arose during the Renaissance in an attempt to revive the classical Greek drama in which dialogue, dance, and song were combined. Being strongly intertwined with western classical music, the opera has undergone enormous changes in the past four centuries and it is an important form of theatre until this day. Noteworthy is the major influence of the German 19th-century composer Richard Wagner on the opera tradition. In his view, there was no proper balance between music and theatre in the operas of his time, because the music seemed to be more important than the dramatic aspects in these works. To restore the connection with the classical drama, he entirely renewed the operatic form to emphasize the equal importance of music and drama in works that he called "music dramas". Chinese opera has seen a more conservative development over a somewhat longer period of time. Pantomime (informally panto), is a type of musical comedy stage production, designed for family entertainment. It was developed in England and is still performed throughout the United Kingdom, generally during the Christmas and New Year season and, to a lesser extent, in other English-speaking countries. Modern pantomime includes songs, gags, slapstick comedy and dancing, employs gender-crossing actors, and combines topical humour with a story loosely based on a well-known fairy tale, fable or folk tale. It is a participatory form of theatre, in which the audience is expected to sing along with certain parts of the music and shout out phrases to the performers. These stories follow in the tradition of fables and folk tales. Usually, there is a lesson learned, and with some help from the audience, the hero/heroine saves the day. This kind of play uses stock characters seen in masque and again commedia dell'arte, these characters include the villain (doctore), the clown/servant (Arlechino/Harlequin/buttons), the lovers etc. These plays usually have an emphasis on moral dilemmas, and good always triumphs over evil, this kind of play is also very entertaining making it a very effective way of reaching many people. Pantomime has a long theatrical history in Western culture dating back to classical theatre. It developed partly from the 16th century commedia dell'arte tradition of Italy, as well as other European and British stage traditions, such as 17th-century masques and music hall. An important part of the pantomime, until the late 19th century, was the harlequinade. Outside Britain the word "pantomime" is usually used to mean miming, rather than the theatrical form discussed here. Mime is a theatrical medium where the action of a story is told through the movement of the body, without the use of speech. Performance of mime occurred in Ancient Greece, and the word is taken from a single masked dancer called "Pantomimus", although their performances were not necessarily silent. In Medieval Europe, early forms of mime, such as mummer plays and later dumbshows, evolved. In the early nineteenth century Paris, Jean-Gaspard Deburau solidified the many attributes that we have come to know in modern times, including the silent figure in whiteface. Jacques Copeau, strongly influenced by Commedia dell'arte and Japanese Noh theatre, used masks in the training of his actors. Étienne Decroux, a pupil of his, was highly influenced by this and started exploring and developing the possibilities of mime and refined corporeal mime into a highly sculptural form, taking it outside of the realms of naturalism. Jacques Lecoq contributed significantly to the development of mime and physical theatre with his training methods. While some ballet emphasises "the lines and patterns of movement itself" dramatic dance "expresses or imitates emotion, character, and narrative action". Such ballets are theatrical works that have characters and "tell a story", Dance movements in ballet "are often closely related to everyday forms of physical expression, [so that] there is an expressive quality inherent in nearly all dancing", and this is used to convey both action and emotions; mime is also used. Examples include Pyotr Ilyich Tchaikovsky's "Swan Lake", which tells the story of Odette, a princess turned into a swan by an evil sorcerer's curse, Sergei Prokofiev's ballet "Romeo and Juliet", based on Shakespeare's famous play, and Igor Stravinsky's "Petrushka", which tells the story of the loves and jealousies of three puppets. Creative drama includes dramatic activities and games used primarily in educational settings with children. Its roots in the United States began in the early 1900s. Winifred Ward is considered to be the founder of creative drama in education, establishing the first academic use of drama in Evanston, Illinois. The earliest form of Indian drama was the Sanskrit drama. Between the 1st century AD and the 10th was a period of relative peace in the history of India during which hundreds of plays were written. With the Islamic conquests that began in the 10th and 11th centuries, theatre was discouraged or forbidden entirely. Later, in an attempt to re-assert indigenous values and ideas, village theatre was encouraged across the subcontinent, developing in various regional languages from the 15th to the 19th centuries. Modern Indian theatre developed during the period of colonial rule under the British Empire, from the mid-19th century until the mid-20th. The earliest-surviving fragments of Sanskrit drama date from the 1st century AD. The wealth of archeological evidence from earlier periods offers no indication of the existence of a tradition of theatre. The ancient "Vedas" (hymns from between 1500 and 1000 BC that are among the earliest examples of literature in the world) contain no hint of it (although a small number are composed in a form of dialogue) and the rituals of the Vedic period do not appear to have developed into theatre. The "Mahābhāṣya" by Patañjali contains the earliest reference to what may have been the seeds of Sanskrit drama. This treatise on grammar from 140 BC provides a feasible date for the beginnings of theatre in India. The major source of evidence for Sanskrit theatre is "A Treatise on Theatre" ("Nātyaśāstra"), a compendium whose date of composition is uncertain (estimates range from 200 BC to 200 AD) and whose authorship is attributed to Bharata Muni. The "Treatise" is the most complete work of dramaturgy in the ancient world. It addresses acting, dance, music, dramatic construction, architecture, costuming, make-up, props, the organisation of companies, the audience, competitions, and offers a mythological account of the origin of theatre. Its drama is regarded as the highest achievement of Sanskrit literature. It utilised stock characters, such as the hero ("nayaka"), heroine ("nayika"), or clown ("vidusaka"). Actors may have specialised in a particular type. It was patronized by the kings as well as village assemblies. Famous early playwrights include Bhasa, Kalidasa (famous for "Vikrama and Urvashi", "Malavika and Agnimitra", and "The Recognition of Shakuntala"), Śudraka (famous for "The Little Clay Cart"), Asvaghosa, Daṇḍin, and Emperor Harsha (famous for "Nagananda", "Ratnavali," and "Priyadarsika"). "Śakuntalā" (in English translation) influenced Goethe's "Faust" (1808–1832). Rabindranath Tagore was a pioneering modern playwright who wrote plays noted for their exploration and questioning of nationalism, identity, spiritualism and material greed. His plays are written in Bengali and include "Chitra" ("Chitrangada", 1892), "The King of the Dark Chamber" ("Raja", 1910), "The Post Office" ("Dakghar", 1913), and "Red Oleander" ("Raktakarabi", 1924). Girish Karnad is a noted playwright, who has written a number of plays that use history and mythology, to critique and problematize ideas and ideals that are of contemporary relevance. Karnad's numerous plays such as "Tughlaq", "Hayavadana", "Taledanda", and "Naga-Mandala" are significant contributions to Indian drama. Vijay Tendulkar and Mahesh Dattani are amongst the major Indian playwrights of the 20th century. Mohan Rakesh in Hindi and Danish Iqbal in Urdu are considered architects of new age Drama. Mohan Rakesh's Aadhe Adhoore and Danish Iqbal's "Dara Shikoh" are considered modern classics. Urdu Drama evolved from the prevailing dramatic traditions of North India shaping Rahas or Raas as practiced by exponents like Nawab Wajid Ali Shah (1822 – 1887) of Awadh. His dramatic experiments led to the famous Inder Sabha of Amanat and later this tradition took the shape of Parsi Theatre. Agha Hashr Kashmiri is the culmination of this tradition. Urdu theatre tradition has greatly influenced modern Indian theatre. Theatre has flourished in Urdu (which was called Hindi by early writers), along with Gujrati, Marathi, and Bengali. Urdu drama has had an important influence on Bombay Film industry and all the early works of Urdu theatre (performed by Parsi Companies) were made into films. Urdu dramatic tradition has existed for more than a 100 years. Prof Hasan, Ghulam Jeelani, J.N,Kaushal, Shameem Hanfi, Jameel Shaidayi, etc. belong to the old generation, contemporary writers like Danish Iqbal, Sayeed Alam, Shahid Anwar, Iqbal Niyazi, and Anwar are a few postmodern playwrights actively contributing in the field of Urdu Drama. Sayeed Alam is known for his wit and humour and more particularly for plays like 'Ghalib in New Delhi', 'Big B' and many other works, which are regularly staged for large audiences. "Maulana Azad" is his most important play both for its content and style. Danish Iqbal's play "Dara Shikoh" directed by M. S. Sathyu is a modern classic that uses newer theatre techniques and a contemporary perspective. His other plays are "Sahir". on the famous lyricist and revolutionary poet. "Kuchh Ishq kiya Kuchh Kaam" is another play written by Danish which is basically a Celebration of Faiz's poetry, featuring events from the early part of his life, particularly the events and incidents of pre-partition days which shaped his life and ideals. "Chand Roz Aur Meri Jaan" – another play inspired from Faiz's letters written from various jails during the Rawalpindi Conspiracy days. He has written 14 other plays including "Dilli Jo Ek Shehr Thaa" and "Main Gaya Waqt Nahin hoon". Shahid's "Three B" is also a significant play. He has been associated with many groups like 'Natwa' and others. Zaheer Anwar has kept the flag of Urdu theatre flying in Kolkata. Unlike the writers of previous generation Sayeed, Shahid, Danish Iqbal and Zaheer do not write bookish plays but their work is a product of performing tradition. Iqbal Niyazi of Mumbai has written several plays in Urdu, his play "AUR KITNE JALYANWALA BAUGH?" won a National award other awards. Hence this is the only generation after Amanat and Agha Hashr who actually write for stage and not for libraries. Chinese theatre has a long and complex history. Today it is often called Chinese opera although this normally refers specifically to the popular form known as Beijing opera and Kunqu; there have been many other forms of theatre in China, such as zaju. Japanese Nō drama is a serious dramatic form that combines drama, music, and dance into a complete aesthetic performance experience. It developed in the 14th and 15th centuries and has its own musical instruments and performance techniques, which were often handed down from father to son. The performers were generally male (for both male and female roles), although female amateurs also perform Nō dramas. Nō drama was supported by the government, and particularly the military, with many military commanders having their own troupes and sometimes performing themselves. It is still performed in Japan today. Kyōgen is the comic counterpart to Nō drama. It concentrates more on dialogue and less on music, although Nō instrumentalists sometimes appear also in Kyōgen. Kabuki drama, developed from the 17th century, is another comic form, which includes dance.
Drama is the specific mode of fiction represented in performance: a play, opera, mime, ballet, etc., performed in a theatre, or on radio or television. Considered as a genre of poetry in general, the dramatic mode has been contrasted with the epic and the lyrical modes ever since Aristotle's "Poetics" (c. 335 BC)—the earliest work of dramatic theory. The term "drama" comes from a Greek word meaning "action" (Classical Greek:, "drama"), which is derived from "I do" (Classical Greek:, "drao"). The two masks associated with drama represent the traditional generic division between comedy and tragedy.
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summarize: The Warsaw Treaty's organization was two-fold: the Political Consultative Committee handled political matters, and the Combined Command of Pact Armed Forces controlled the assigned multi-national forces, with headquarters in Warsaw, Poland. Furthermore, the Supreme Commander of the Unified Armed Forces of the Warsaw Treaty Organization which commanded and controlled all the military forces of the member countries was also a First Deputy Minister of Defence of the USSR, and the Chief of Combined Staff of the Unified Armed Forces of the Warsaw Treaty Organization was also a First Deputy Chief of the General Staff of the Armed Forces of the USSR. Therefore, although ostensibly an international collective security alliance, the USSR dominated the Warsaw Treaty armed forces. The strategy behind the formation of the Warsaw Pact was driven by the desire of the Soviet Union to dominate Central and Eastern Europe. The Soviets wanted to keep their part of Europe and not let the Americans take it from them. This policy was driven by ideological and geostrategic reasons. Ideologically, the Soviet Union arrogated the right to define socialism and communism and act as the leader of the global socialist movement. A corollary to this idea was the necessity of intervention if a country appeared to be violating core socialist ideas and Communist Party functions, which was explicitly stated in the Brezhnev Doctrine. Geostrategic principles also drove the Soviet Union with the desire to create a buffer zone to prevent invasion of its territory by Western European powers. Before the creation of the Warsaw Pact, Czechoslovak leadership, fearful of a rearmed Germany, sought to create a security pact with East Germany and Poland. These states protested strongly against the re-militarization of West Germany. The Warsaw Pact was primarily put in place as a consequence of the rearming of West Germany inside NATO. Soviet leaders, like many European countries on both sides of the Iron Curtain, feared Germany being once again a military power and a direct threat. The consequences of German militarism remained a fresh memory among the Soviets and Eastern Europeans. As the Soviet Union already had bilateral treaties with all of its eastern satellites, the Pact has been long considered'superfluous', and because of the rushed way in which it was conceived, NATO officials labeled it as a 'cardboard castle'. Previously, in March 1954, the USSR, fearing the restoration of German militarism in West Germany, requested admission to NATO. The Soviet request to join NATO arose in the aftermath of the Berlin Conference of January–February 1954. Soviet foreign minister Molotov made proposals to have Germany reunified and elections for a pan-German government, under conditions of withdrawal of the four powers' armies and German neutrality, but all were refused by the other foreign ministers, Dulles (USA), Eden (UK), and Bidault (France). Proposals for the reunification of Germany were nothing new: earlier on 20 March 1952, talks about a German reunification, initiated by the so-called 'Stalin Note', ended after the United Kingdom, France, and the United States insisted that a unified Germany should not be neutral and should be free to join the European Defence Community (EDC) and rearm. James Dunn (USA), who met in Paris with Eden, Adenauer, and Robert Schuman (France), affirmed that "the object should be to avoid discussion with the Russians and to press on the European Defense Community". According to John Gaddis "there was little inclination in Western capitals to explore this offer" from the USSR. While historian Rolf Steininger asserts that Adenauer's conviction that "neutralization means sovietization" was the main factor in the rejection of the Soviet proposals, Adenauer also feared that German unification might have resulted in the end of the CDU's dominance in the West German Bundestag. Consequently, Molotov, fearing that the EDC would be directed in the future against the USSR and "seeking to prevent the formation of groups of European States directed against other European States", made a proposal for a General European Treaty on Collective Security in Europe "open to all European States without regard as to their social systems" which would have included the unified Germany (thus making the EDC – perceived by the USSR as a threat – unusable). But Eden, Dulles, and Bidault opposed the proposal. One month later, the proposed European Treaty was rejected not only by supporters of the EDC but also by Western opponents of the European Defence Community (like French Gaullist leader Gaston Palewski) who perceived it as "unacceptable in its present form because it excludes the USA from participation in the collective security system in Europe". The Soviets then decided to make a new proposal to the governments of the US, UK, and France to accept the participation of the US in the proposed General European Agreement. And considering that another argument deployed against the Soviet proposal was that it was perceived by Western powers as "directed against the North Atlantic Pact and its liquidation", the Soviets decided to declare their "readiness to examine jointly with other interested parties the question of the participation of the USSR in the North Atlantic bloc", specifying that "the admittance of the USA into the General European Agreement should not be conditional on the three Western powers agreeing to the USSR joining the North Atlantic Pact". Again all proposals, including the request to join NATO, were rejected by the UK, US, and French governments shortly after. Emblematic was the position of British General Hastings Ismay, a fierce supporter of NATO expansion. He opposed the request to join NATO made by the USSR in 1954 saying that "the Soviet request to join NATO is like an unrepentant burglar requesting to join the police force". In April 1954 Adenauer made his first visit to the USA meeting Nixon, Eisenhower, and Dulles. Ratification of the EDC was delayed but the US representatives made it clear to Adenauer that the EDC would have to become a part of NATO. Memories of the Nazi occupation were still strong, and the rearmament of Germany was feared by France too. On 30 August 1954 French Parliament rejected the EDC, thus ensuring its failure and blocking a major objective of US policy towards Europe: to associate Germany militarily with the West. The US Department of State started to elaborate alternatives: Germany would be invited to join NATO or, in the case of French obstructionism, strategies to circumvent a French veto would be implemented in order to obtain German rearmament outside NATO. On 23 October 1954 – only nine years after the Western Allies (UK, USA, and USSR) defeated Nazi Germany ending World War II in Europe – the admission of the Federal Republic of Germany to the North Atlantic Pact was finally decided. The incorporation of West Germany into the organization on 9 May 1955 was described as "a decisive turning point in the history of our continent" by Halvard Lange, Foreign Affairs Minister of Norway at the time. In November 1954, the USSR requested a new European Security Treaty, in order to make a final attempt to not have a remilitarized West Germany potentially opposed to the Soviet Union, with no success. On 14 May 1955, the USSR and other seven European countries "reaffirming their desire for the establishment of a system of European collective security based on the participation of all European states irrespective of their social and political systems" established the Warsaw Pact in response to the integration of the Federal Republic of Germany into NATO, declaring that: "a remilitarized Western Germany and the integration of the latter in the North-Atlantic bloc [...] increase the danger of another war and constitutes a threat to the national security of the peaceable states; [...] in these circumstances the peaceable European states must take the necessary measures to safeguard their security". One of the founding members, East Germany was allowed to re-arm by the Soviet Union and the National People's Army was established as the armed forces of the country to counter the rearmament of West Germany and vice versa. The eight-member countries of the Warsaw Pact pledged the mutual defense of any member who would be attacked. Relations among the treaty signatories were based upon mutual non-intervention in the internal affairs of the member countries, respect for national sovereignty, and political independence. The founding signatories to the Treaty of Friendship, Cooperation and Mutual Assistance consisted of the following communist governments: For 36 years, NATO and the Warsaw Pact never directly waged war against each other in Europe; the United States and the Soviet Union and their respective allies implemented strategic policies aimed at the containment of each other in Europe, while working and fighting for influence within the wider Cold War on the international stage. These included the Korean War, Vietnam War, Bay of Pigs invasion, Dirty War, Cambodian–Vietnamese War, and others. In 1956, following the declaration of the Imre Nagy government of the withdrawal of Hungary from the Warsaw Pact, Soviet troops entered the country and removed the government. Soviet forces crushed the nationwide revolt, leading to the death of an estimated 2,500 Hungarian citizens. The multi-national Communist armed forces' sole joint action was the Warsaw Pact invasion of Czechoslovakia in August 1968. All member countries, with the exception of the Socialist Republic of Romania and the People's Republic of Albania, participated in the invasion. The German Democratic Republic provided only minimal support, however. In 1989, popular civil and political public discontent toppled the Communist governments of the Warsaw Treaty countries. Independent national politics made feasible with the "perestroika" and "glasnost" policies induced institutional collapse of the Communist government in the USSR in 1991. From 1989 to 1991, Communist governments were overthrown in Albania, Poland, Hungary, Czechoslovakia, East Germany, Romania, Bulgaria, and the Soviet Union. As the last acts of the Cold War were playing out, several Warsaw Pact states (Poland, Czechoslovakia, and Hungary) participated in the US-led coalition effort to liberate Kuwait in the Gulf War. On 25 February 1991, the Warsaw Pact was declared disbanded at a meeting of defence and foreign ministers from remaining Pact countries meeting in Hungary. On 1 July 1991, in Prague, the Czechoslovak President Václav Havel formally ended the 1955 Warsaw Treaty Organization of Friendship, Cooperation and Mutual Assistance and so disestablished the Warsaw Treaty after 36 years of military alliance with the USSR. The USSR disestablished itself in December 1991. On 12 March 1999, the Czech Republic, Hungary, and Poland joined NATO; Bulgaria, Estonia, Latvia, Lithuania, Romania, and Slovakia joined in March 2004; Albania joined on 1 April 2009. Russia and some other post-USSR states joined the Collective Security Treaty Organization (CSTO) in 1992, or the Shanghai Five in 1996, which was renamed the Shanghai Cooperation Organization (SCO) after Uzbekistan's addition in 2001. In November 2005, the Polish government opened its Warsaw Treaty archives to the Institute of National Remembrance, which published some 1,300 declassified documents in January 2006. Yet the Polish government reserved publication of 100 documents, pending their military declassification. Eventually, 30 of the reserved 100 documents were published; 70 remained secret and unpublished. Among the documents published was the Warsaw Treaty's nuclear war plan, "Seven Days to the River Rhine" – a short, swift counter-attack capturing Austria, Denmark, Germany, and the Netherlands east of the Rhine, using nuclear weapons, in self-defense, after a NATO first strike. The plan originated as a 1979 field training exercise war game and metamorphosed into official Warsaw Treaty battle doctrine, until the late 1980s – which is why the Polish People's Republic was a nuclear weapons base, first, to 178, then, to 250 tactical-range rockets, though these numbers may differ. Doctrinally, as a Soviet-style (offensive) battle plan, "Seven Days to the River Rhine" gave commanders few defensive-war strategies for fighting NATO in Warsaw Treaty territory.
The Warsaw Treaty Organization (WTO), officially the Treaty of Friendship, Cooperation and Mutual Assistance, commonly known as the Warsaw Pact (WP), was a collective defense treaty signed in Warsaw, Poland between the Soviet Union and seven other Eastern Bloc socialist republics of Central and Eastern Europe in May 1955, during the Cold War. The Warsaw Pact was the military complement to the Council for Mutual Economic Assistance (CoMEcon), the regional economic organization for the socialist states of Central and Eastern Europe. The Warsaw Pact was created in reaction to the integration of West Germany into NATO in 1955 per the London and Paris Conferences of 1954, but it is also considered to have been motivated by Soviet desires to maintain control over military forces in Central and Eastern Europe.
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summarize: The International Organization for Standardization is an independent, non-governmental organization, the members of which are the standards organizations of the 164 member countries. It is the world's largest developer of voluntary international standards and it facilitates world trade by providing common standards among nations. More than twenty thousand standards have been set, covering everything from manufactured products and technology to food safety, agriculture, and healthcare. Use of the standards aids in the creation of products and services that are safe, reliable, and of good quality. The standards help businesses increase productivity while minimizing errors and waste. By enabling products from different markets to be directly compared, they facilitate companies in entering new markets and assist in the development of global trade on a fair basis. The standards also serve to safeguard consumers and the end-users of products and services, ensuring that certified products conform to the minimum standards set internationally. The organization today known as ISO, began in the 1920s as the International Federation of the National Standardizing Associations (ISA). It was suspended in 1942 during World War II, but after the war ISA was approached by the recently-formed United Nations Standards Coordinating Committee (UNSCC) with a proposal to form a new global standards body. In October 1946, ISA and UNSCC delegates from 25 countries met in London and agreed to join forces to create the new International Organization for Standardization. The new organization officially began operations in February 1947. The three official languages of the ISO are English (with Oxford spelling), French, and Russian. The name of the organization in French is ', and in Russian, ('). "ISO" is not an acronym. The organization adopted "ISO" as its abbreviated name in reference to the Greek word "" (, meaning "equal"), as its name in the three official languages would have had different acronyms. During the founding meetings of the new organization, the Greek word explanation was not invoked, so this meaning may have been made public later, making it a backronym. ISO gives this explanation of the name: "Because 'International Organization for Standardization' would have different acronyms in different languages (IOS in English, OIN in French), our founders decided to give it the short form "ISO". "ISO" is derived from the Greek "", meaning equal. Whatever the country, whatever the language, the short form of our name is always "ISO"." Both the name "ISO" and the ISO logo are registered trademarks and their use is restricted. ISO is a voluntary organization whose members are recognized authorities on standards, each one representing one country. Members meet annually at a General Assembly to discuss the strategic objectives of ISO. The organization is coordinated by a central secretariat based in Geneva. A council with a rotating membership of 20 member bodies provides guidance and governance, including setting the annual budget of the central secretariat. The technical management board is responsible for more than 250 technical committees, who develop the ISO standards. ISO has formed two joint committees with the International Electrotechnical Commission (IEC) to develop standards and terminology in the areas of electrical and electronic related technologies. ISO/IEC Joint Technical Committee 1 (JTC 1) was created in 1987 to "[d]evelop, maintain, promote and facilitate IT standards", where IT refers to information technology. ISO/IEC Joint Technical Committee 2 (JTC 2) was created in 2009 for the purpose of "[s]tandardization in the field of energy efficiency and renewable energy sources". ISO has 164 national members. ISO has three membership categories, Participating members are called "P" members, as opposed to observing members, who are called "O" members. ISO is funded by a combination of: International standards are the main products of ISO. It also publishes technical reports, technical specifications, publicly available specifications, technical corrigenda, and guides. International standards Technical reports For example: Technical and publicly available specifications For example: Technical corrigenda ISO guides For example: ISO documents are copyrighted and ISO charges for most copies. It does not, however, charge for most draft copies of documents in electronic format. Although they are useful, care must be taken using these drafts as there is the possibility of substantial change before they become finalized as standards. Some standards by ISO and its official U.S. representative (and, via the U.S. National Committee, the International Electrotechnical Commission) are made freely available. A standard published by ISO/IEC is the last stage of a long process that commonly starts with the proposal of new work within a committee. Some abbreviations used for marking a standard with its status are: Abbreviations used for amendments are: Other abbreviations are: International Standards are developed by ISO technical committees (TC) and subcommittees (SC) by a process with six steps: The TC/SC may set up working groups (WG) of experts for the preparation of a working drafts. Subcommittees may have several working groups, which may have several Sub Groups (SG). It is possible to omit certain stages, if there is a document with a certain degree of maturity at the start of a standardization project, for example, a standard developed by another organization. ISO/IEC directives also allow the so-called "Fast-track procedure". In this procedure a document is submitted directly for approval as a draft International Standard (DIS) to the ISO member bodies or as a final draft International Standard (FDIS), if the document was developed by an international standardizing body recognized by the ISO Council. The first step—a proposal of work (New Proposal) is approved at the relevant subcommittee or technical committee (e.g., SC29 and JTC1 respectively in the case of Moving Picture Experts Group – ISO/IEC JTC1/SC29/WG11). A working group (WG) of experts is set up by the TC/SC for the preparation of a working draft. When the scope of a new work is sufficiently clarified, some of the working groups (e.g., MPEG) usually make open request for proposals—known as a "call for proposals". The first document that is produced, for example, for audio and video coding standards is called a verification model (VM) (previously also called a "simulation and test model"). When a sufficient confidence in the stability of the standard under development is reached, a working draft (WD) is produced. This is in the form of a standard, but is kept internal to working group for revision. When a working draft is sufficiently solid and the working group is satisfied that it has developed the best technical solution to the problem being addressed, it becomes a committee draft (CD). If it is required, it is then sent to the P-members of the TC/SC (national bodies) for ballot. The committee draft becomes final committee draft (FCD) if the number of positive votes exceeds the quorum. Successive committee drafts may be considered until consensus is reached on the technical content. When consensus is reached, the text is finalized for submission as a draft International Standard (DIS). Then the text is submitted to national bodies for voting and comment within a period of five months. It is approved for submission as a final draft International Standard (FDIS) if a two-thirds majority of the P-members of the TC/SC are in favour and if not more than one-quarter of the total number of votes cast are negative. ISO will then hold a ballot with National Bodies where no technical changes are allowed (yes/no ballot), within a period of two months. It is approved as an International Standard (IS) if a two-thirds majority of the P-members of the TC/SC is in favour and not more than one-quarter of the total number of votes cast are negative. After approval, only minor editorial changes are introduced into the final text. The final text is sent to the ISO central secretariat, which publishes it as the International Standard. On occasion, the fact that many of the ISO-created standards are ubiquitous has led to common use of "ISO" to describe the product that conforms to a standard. Some examples of this are: With the exception of a small number of isolated standards, normally ISO standards are not available free of charge, but for a purchase fee, which has been seen by some as unaffordable by small open source projects. The ISO/IEC JTC1 fast-track procedures ("Fast-track" as used by OOXML and "PAS" as used by OpenDocument) have garnered criticism in relation to the standardization of Office Open XML (ISO/IEC 29500). Martin Bryan, outgoing convenor of ISO/IEC JTC1/SC34 WG1, is quoted as saying: I would recommend my successor that it is perhaps time to pass WG1’s outstanding standards over to OASIS, where they can get approval in less than a year and then do a PAS submission to ISO, which will get a lot more attention and be approved much faster than standards currently can be within WG1. The disparity of rules for PAS, Fast-Track and ISO committee generated standards is fast making ISO a laughing stock in IT circles. The days of open standards development are fast disappearing. Instead we are getting "standardization by corporation". The computer security entrepreneur and Ubuntu founder, Mark Shuttleworth, commented on the Standardization of Office Open XML process by saying: "I think it de-values the confidence people have in the standards setting process", and alleged that ISO did not carry out its responsibility. He also noted that Microsoft had intensely lobbied many countries that traditionally had not participated in ISO and stacked technical committees with Microsoft employees, solution providers, and resellers sympathetic to Office Open XML: When you have a process built on trust and when that trust is abused, ISO should halt the process... ISO is an engineering old boys club and these things are boring so you have to have a lot of passion... then suddenly you have an investment of a lot of money and lobbying and you get artificial results. The process is not set up to deal with intensive corporate lobbying and so you end up with something being a standard that is not clear.
The International Organization for Standardization (ISO; ) is an international standard-setting body composed of representatives from various national standards organizations. In contrast to many international organizations, which utilize the British English form of spelling, the ISO uses English with Oxford spelling as one of its official languages along with French and Russian.
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