The astronomical coordinate system in which the position of a body on the celestial sphere is described relative to an observer's celestial horizon and zenith.

The coordinates of a point in this system are its altitude on the vertical circle, and its azimuth westward (clockwise) along the celestial horizon from the observer's south.

Y'know, if you log in, you can write something here, or contact authors directly on the site. Create a New User if you don't already have an account.