Azimuth Angle

The direction or bearing toward which a sloping surface faces (e.g., a north-facing slope has an azimuth angle of 360°; a northeast-facing slope, an azimuth angle of 45°).

1. The direction or bearing toward which a sloping surface faces (e.g., a north-facing slope has an azimuth angle of 360°; a northeast-facing slope, an azimuth angle of 45°). 2. The arc of the horizon measured clockwise from north to the point where a vertical circle through a given heavenly body intersects the horizon (e.g., used for solar azimuth angle).

A positive angle measured clockwise in a reference horizontal plane from a reference direction to a given direction. For a topocentric -horizon coordinate reference frame, the reference direction is due north (true north or magnetic north, depending on the application). 27