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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 Astronomical day ： ウィキペディア英語版 Astronomical day An astronomical day refers to a length of day of exactly or nearly 24 hours beginning at noon instead of at midnight. The exact length has been variously defined as either that of a solar day or of a sidereal day.〔(【引用サイトリンク】title=Astronomical day )〕 Astronomical days were historically used by astronomers (in contrast most commonly to solar days), but since the Industrial Revolution this usage has generally fallen out of favor, in order to avoid confusion with more conventional timekeeping.〔〔(【引用サイトリンク】url=http://www.staff.science.uu.nl/~gent0113/venus/venus_text1.htm )〕 ==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「Astronomical day」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.