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hour circle
In astronomy, the hour circle of a celestial object is the great circle through the object and the celestial poles. It is perpendicular to the celestial equator. The declination of an object as observed on the celestial sphere is the angle measured along the hour circle of that object to the celestial equator. In other words, it is analogous to meridians or longitudes on a globe. A meridian on the celestial sphere matches an hour circle at any time.
==See also==
* Meridian (astronomy)
* Declination
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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