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Fundamental plane (spherical coordinates) : ウィキペディア英語版 | Fundamental plane (spherical coordinates)
The fundamental plane in a spherical coordinate system is a plane which divides the sphere into two hemispheres. The latitude of a point is then the angle between the fundamental plane and the line joining the point to the centre of the sphere.〔.〕 For a geographic coordinate system of the Earth, the fundamental plane is the equator. Celestial coordinate systems have varying fundamental planes:〔.〕 * the equatorial coordinate system uses the celestial equator; * the ecliptic coordinate system uses the ecliptic; * the galactic coordinate system uses the Milky Way; and * the horizontal coordinate system uses the observer's horizon. ==See also==
*Plane of reference
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「Fundamental plane (spherical coordinates)」の詳細全文を読む
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