<p><strong>Noun</strong></p><ul><li>Astronomy, Navigation: 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.</li><li>Surveying, Gunnery: the angle of horizontal deviation, measured clockwise, of a bearing from a standard direction, as from north or south.</li></ul>