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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 Groombridge Transit Circle ： ウィキペディア英語版 Groombridge Transit Circle Groombridge Transit Circle was a meridian transit circle made by Edward Troughton for Stephen Groombridge in 1806, which Groombridge used to compile data for the star catalogue, ''Catalogue of Circumpolar Stars''.〔(Groombridge Transit Circle, 1820. -- Science and Society Picture Library )〕 The advantage of a transit circle over a mural circle (which can measure polar distances) is that it allows measuring right ascension and declination at the same time. 〔 It had an aperture of 3.5 inches and a 5 foot focal length, mounted inside two 4 foot circles on stone piers. 〔 King, Henry C., (1955/2003). ''The History of the Telescope''. Cambridge, Massachusetts: Sky Publishing Corporation. Retrieved from Google Books in 2010: (The History of the Telescope, by Henry C. King, page 234-6 ) 〕 Groombridge used the instrument to determine the positions of over 4000 circumpolar stars.〔 It was eventually bought by James South, and it remained at his observatory at Kensington until 1870.〔 ==References== 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「Groombridge Transit Circle」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.