Hour (h or hr) [2]
Hour (h or hr) [2] :
A unit of angular measure used in astronomy, equal to 1/24 circle or 15. Objects can be located in the sky in a coordinate system in which the equatorial plane is the same as that of the Earth. In this system, the latitude coordinate is called declination and is measured in degrees from the Equator to the poles, just as latitude is measured on the surface of the Earth. The longitude coordinate, called right ascension, is measured in hours from the longitude, traditionally known as the First Point of Aries, at which the Sun appears to cross the Equator on its northward journey in the spring
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