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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 Geocentric coordinates ： ウィキペディア英語版 Geocentric coordinates Geocentric coordinates are an ''Earth-centered'' system of locating objects in the solar system in three-dimensions along the Cartesian X, Y and Z axes. They are differentiated from topocentric coordinates which use the observer's location as the reference point for bearings in altitude and azimuth. Both systems, however, share a common difficulty in that the Earth is constantly moving, which requires the addition of a time component to fix objects. For nearby stars astronomers use heliocentric coordinates, with the center of the Sun as the origin. The reference plane can either be aligned with the Earth's equator, the plane of the ecliptic or the plane of the Milky Way galaxy. The distances involved are so great compared to the relative velocities of the stars that for most purposes the time component can be neglected. == See also == * ECEF, "Earth-Centered Earth-Fixed" coordinate system * Earth-Centered Inertial (ECI) coordinate system 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「Geocentric coordinates」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.