- the arc of the horizon measured clockwise from the south point, in astronomy, or from the north point, in navigation, to the point where a vertical circle through a given heavenly body intersects the horizon.
- the angle of horizontal deviation, measured clockwise, of a bearing from a standard direction, as from north or south.
- the angular distance usually measured clockwise from the north point of the horizon to the intersection with the horizon of the vertical circle passing through a celestial body
- the horizontal angle of a bearing clockwise from a standard direction, such as north
