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horizontal coordinates
A system of celestial coordinates that uses the observer’s horizon as a reference plane and the observer's latitude and longitude as a point of origin. The position of a star, or other object, on the celestial sphere, at any given time, is determined by its altitude, the angular distance of the object above the horizon, and its azimuth, the angular distance of the object angle measured east from north and parallel to the horizon.
Related category
• CELESTIAL MECHANICS
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