hour angle (HA)
An hour angle (HA) is the angle between the hour circle of a celestial object and the observer's meridian, measured anticlockwise along the celestial equator. It is sometimes used as a coordinate in place of right ascension. See also equatorial coordinates.
The local hour angle (LHA) is the hour angle of a celestial object measured with respect to the observer's local meridian.
Related category• CELESTIAL MECHANICS
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