the angular distance along the celestial equator from the observer''s meridian to the hour circle of a given celestial body
(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day 同义词：HA,
In astronomy and celestial navigation, the hour angle is one of the coordinates used in the equatorial coordinate system to give the direction of a point on the celestial sphere.
例句与用法
1.
the sun's hour angle counts from the middy position and changes 360°per day or 15°per hour. 太阳的时角从中午的位置算起，每天改变360或一小时变化15。
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