A term used in astronomy to define the bearing of a star relative, usually, to the north. Sometimes south is used as the reference direction. See alsoaltitude (in astronomy).
Astronomy
The direction to a celestial object measured in degrees, clockwise from north around the observer's horizon. Azimuth is 0 ° for an object due north, 90 ° due east, 180 ° due south, and 270 ° due west.
Space Exploration
The angular distance of an object eastwards along the horizon, measured from due north, between the astronomical meridian (the vertical circle passing through the centre of the sky and the north and south points on the horizon) and the vertical circle containing the celestial body whose position is to be measured.
Geology and Earth Sciences
The angle made by a line on the surface of the Earth with magnetic meridian. In radar terminology, the direction at right angles to the direction of radar propagation.