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Yuxi (AD 281 - - 356), Zizhong, Hueiji Yuyao (now Zhejiang Yuyao) people, the Eastern Jin Dynasty astronomer, said Xuan night Inheritance and developers. Yuxi in the West Jin Tai two years (AD 281 years) was born in just subjugation Sun Wuguan official family. Father police Yu, Sun Wu is the syndrome s generals. Family great-grandfather Yu Fan, is Wu celebrities, training note "easy", "I", "The Analects of Confucius", "Mandarin." Song Zu Yu family, the Wu served more riding Captain, Hejian Prefecture, Shanxi Province after the inter-fluvial, author of "On the big dome." Pre brother Yu, East Jincheng Di (326 AD - - 342 reign), Conti (343, - - 344 reign), Mudi (AD 345--361 years in office -) served Zhuzuo Lang, the bulk ride often be other officials, Kang Jin Jue Ping Hou, good classics, history, author of "a", "Hueiji Code" and other. Yuxi Bo learn ancient, precocious young man had a high reputation, praised by the people. Western Jin Dynasty Emperor (reigned AD 307 ─ 313) as his imperial office, his strong speech. East Jinyuan Di (In AD 317 the - - 323 reign) when Zhuge recover any Hueiji Prefecture, forcing his men to act Yuxi Cao, for his great stimulus, Bushi life later determined. Eastern Jin Dynasty Emperor Ming (AD 323 - - 326 reign) and Confederation have repeatedly Chao him an official, were not refuse. Confederation, the inside so what charge had praised Yuxi "CMP strong knowledge, micro-drilling research firm, there are Vladimir and the ground", the emperor issued an edict reward him, "Shou Dao Qing Zhen, do not camp World Service, delay noble science, exercise Quasi ancients. " Yuxi Anpinyuedao visible, but a lifetime scholarship only. Yuxi reluctant official, scholarship will be at home, he "interpretation" Mao slightly "note" Book of Filial Piety "for" Chi Lin "thirty", mainly emphasis on the interpretation of the classics and training Note but he was from the ancient annals book, I found Han Dynasty initially follow the old calendar to the winter solstice starting in cows the first time, based on the measured to cows West fight night near the center Kanstar at the beginning calendar developed as the winter solstice, Liu paragraph of winter solstice West encounter the phenomenon of very suspect, hesitated and finally their speech, saying that "winter retreat before the cow four times in five," Jia Kui came to understand, he said the winter solstice in the bucket. However, the ancient Chinese astronomers moved to the winter solstice point whether records are kept, not the "Sunday" (stars) and "age" (tropical year) separate. In fact, due to the gravitational influence of the moon, sun and planets, so the equatorial part of the more prominent oval-shaped yellow around the Earth's axis of rotation for the slow movement, the vernal equinox Yellow River Road corresponding to an annual rate of 50.24 points westward, westward shift of almost 71 years 1 degree, about 26,000 years to move one week. Yuxi although at that time did not know and can not know the above reason, but he found the occurrence of ancient winter solstice position data from the analysis of the phenomenon in the West back, come winter solstice sun days of the week is not one year old to the conclusion that since the days of the day, since the age of years. Winter solstice sun than one year old poor short days of the week, Yuxi will be named as "precession," which found that the difference between the return of the same sidereal year. Furthermore, according to Yuxi "Yao Dian" records "winter solstice short Pleiades star", while the winter solstice was found "in the east wall," that wall places nine degrees in The stomach from the Pleiades constellation fourteen degrees, Hamal twelve degrees, Kui places sixteen degrees, nine degrees to the wall places, total regression fifty degrees apart Yuxi estimate Tang Yao era "two thousand seven hundred years" thus can be obtained precession is about "five years back once." Precession found that China is a major event in the history of astronomy. Yuxi discovered precession, although the ratio of the ancient Greek Hipparcos night, but higher than Hipparcos difference once per century values accurate. And since the Southern and Northern Dynasties Zu precession will introduce "Daming calendar", the Sui Liu Mourning "almanac" Song Yang Zhong Fu "unified calendar days" and meta GuoShouJing "Shoushi calendar" of the difference between the years become increasingly accurate. At the time, Europe was prepared calendar family are still in use for centuries by rule difference was the difference between the data. Comparing the two dwarfs. Yuxi has studied the theory of the universe. He said the celestial dome since the Han Dynasty, Zhang Heng's celestial globe, said Xi Meng Xuan night said three were analyzed and compared, say that the celestial dome "planetarium cover Li, the law re-set" (the effect: Days like hats, to like anti-cover plate) was too careless; celestial globe, said, "such as chicken celestial globe, celestial round as projectiles, such as ground chicken in the yellow, solitary living, big and small, the water table day, days of the package, a Utah wrapped yellow shell, the world each ride standing gas contained water float "(the effect: the entire universe is like an egg, the egg is like the earth in the days of small yellow earth, and the internal surface of days have water, sky and ground relationship is like eggshell and yolk as heaven and earth are made of gas composition, and are floating in water), is less than celestial dome advanced, but still a non-perfection;.. so Confederation Xiankang in ( about 340 AD) is a "safe Tianlun." Yuxi said: "The sky was poor to infinity, to deep measured in unexpected day indeed on, there is often the security of shape; to soul Yan next, there is the body home and tranquility when the phase cover risk, side is all square, round it. all round; no meaning is different from its radius also shine cloth columns, each running, Utah Jianghai tidal, Kozo also that thousands of products "(effect: the universe is boundless, but also relatively stable; no heaven and earth. Li radius of the same wood; all the heavenly bodies have their own movement cycle, with its own orbit, is not attached to a fixed spherical shell) "Book of Jin astronomical records," said: "Yuxi because 'night Vision'. as is said, "On days of". "indeed, Yuxi's" an Tianlun "both denied the hemispherical dome of the celestial dome, but also criticized the celestial globe celestial sphere having a solid shell said. He believed in an infinite universe advocates say Xuan night and give the inheritance and development, which in the history of astronomy, occupy an important position. Famous study of Chinese history of science Joseph Needham Britain, which like evaluated, "said Xuan Night": "This is the world view of liberal progress, compared with any of the allegations in Greece, no less. |