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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 Lunar terminator ： ウィキペディア英語版 Lunar terminator The Lunar terminator is the division between the illuminated and dark parts of the Earth's Moon.〔(''List of basic lunar features'' )〕 It is the lunar equivalent of the division between night and day on the Earth's sphere, although the Moon's much lower rate of rotation〔The lunar day cycle is 29.53 Earth days in length (see ()), so the terminator moves across the lunar surface at 15.4 kilometers per hour.〕 means it takes longer for it to pass across the surface. Due to the angle at which sunlight strikes this portion of the moon, shadows cast by craters and other geological features are elongated, thereby making such features more apparent to the observer. This phenomenon is similar to the lengthening of shadows on Earth when the sun is low in the sky. For this reason, much lunar photographic study centers on the illuminated area near the lunar terminator, and the resulting shadows provide accurate descriptions of the terrain.〔(Flintstone Stargazing website, accessed 17 August 2010 )〕 ==See also== * Colongitude * Lunar phase 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「Lunar terminator」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.