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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Gan De ： ウィキペディア英語版 Gan De Gan De (; fl. 4th century BC) was a Chinese astronomer/astrologer born in the State of Qi〔Shiji 27 stated that he was from the State of Qi; however, according to a 4th-century BCE testimony by Xu Guang, he was actually from the State of Lu. Further citation from another work dated to the 5th century by Ruan Xiaoxu gives an account indicating that he was from the State of Chu.〕 also known as the Lord Gan (Gan Gong). Along with Shi Shen, he is believed to be the first in history known by name to compile a star catalogue, preceded by the anonymous authors of the early Babylonian star catalogues and followed by the Greek Hipparchus who is the first known in the Western tradition to have compiled a star catalogue. ==Observations== Gan De made some of the first detailed observations of Jupiter in recorded history. He described the planet as "very large and bright".〔Hockey, Thomas A. () (1999). Galileo's Planet: Observing Jupiter Before Photography. CRC Press. ISBN 0-7503-0448-0〕 In one of his observations on Jupiter, he reported a "small reddish star" next to Jupiter. The historian Xi Zezong has claimed that this was a naked-eye observation of Ganymede in the summer of 365 BC, long before Galileo Galilei's celebrated discovery of the same in 1610 (all four of the brightest moons are technically visible to the unaided eye, but in practice are normally hidden by the glare of Jupiter). By occluding Jupiter itself behind a high tree limb perpendicular to the satellites' orbital plane to prevent the planet's glare from obscuring them, one or more of the Galilean moons might be spotted in favorable conditions. However, Gan De reported the color of the companion as reddish, which is puzzling since the moons are too faint for their color to be perceived with the naked eye. Shi and Gan together made fairly accurate observations of the five major planets.〔Deng, Yinke. () (2005). Chinese Ancient Inventions. ISBN 7-5085-0837-8〕〔Xi Zezong, "The Discovery of Jupiter's Satellite Made by Gan De 2000 years Before Galileo," ''Chinese Physics'' 2 (3) (1982): 664-67.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gan De」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.