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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 Central meridian (planets) ： ウィキペディア英語版 Central meridian (planets) The central meridian of a celestial body presenting a disc to an observer, such as planet, moon, or star, is a meridian on the body's surface (all planets, not just Earth, have meridians). It is the meridian that goes through the centre of the body's disc, as seen from the point of view of the observer.〔 〕 The term as generally used in observational astronomy refers to the central meridian of the celestial body as seen by a theoretical observer on Earth for whom the celestial body is at the zenith. An imaginary line is drawn from the centre of the Earth to the center of the other celestial body. The intersection between this line and the celestial body's surface is the sub-Earth point. The central meridian is the meridian going through the sub-Earth point. Because of the body's rotation and orbital alignment with the observer, this meridian changes with time. Take for example the Earth as seen from the Moon. There will be a meridian going through the centre of the Earth's visible disc (for example 75° West), and this is not always the prime meridian (0° W / 0° E), as it changes due to the rotation of the Earth. ==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「Central meridian (planets)」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.