# horizontal coordinates

Horizontal coordinates are 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.