Azimuth
Azimuth Az"i*muth, n. [OE. azimut, F. azimut, fr. Ar. as-sum?t, pl. of as-samt a way, or perh., a point of the horizon and a circle extending to it from the zenith, as being the Arabic article: cf. It. azzimutto, Pg. azimuth, and Ar. samt-al-r[=a]'s the vertex of the heaven. Cf. {Zenith}.] (Astron. & Geodesy) (a) The quadrant of an azimuth circle. (b) An arc of the horizon intercepted between the meridian of the place and a vertical circle passing through the center of any object; as, the azimuth of a star; the azimuth or bearing of a line surveying. [1913 Webster]

Note: In trigonometrical surveying, it is customary to reckon the azimuth of a line from the south point of the horizon around by the west from 0[deg] to 360[deg]. [1913 Webster]

{Azimuth circle}, or {Vertical circle}, one of the great circles of the sphere intersecting each other in the zenith and nadir, and cutting the horizon at right angles. --Hutton.

{Azimuth compass}, a compass resembling the mariner's compass, but having the card divided into degrees instead of rhumbs, and having vertical sights; used for taking the magnetic azimuth of a heavenly body, in order to find, by comparison with the true azimuth, the variation of the needle.

{Azimuth dial}, a dial whose stile or gnomon is at right angles to the plane of the horizon. --Hutton.

{Magnetic azimuth}, an arc of the horizon, intercepted between the vertical circle passing through any object and the magnetic meridian. This is found by observing the object with an azimuth compass. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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• Azimuth — (Audio IPA|lang=US English|en us azimuth.ogg|ˈæzɪməθ) is a mathematical concept defined as the angle, usually measured in degrees (°), between a reference plane and a point. This concept is used in many practical applications including navigation …   Wikipedia

• Azĭmuth — (arab., Astr.), der Winkel (Azimuthalwinkel), den sein Vertical am Zenith mit dem Meridiane macht; das Maß desselben ist ein Bogen des Horizonts. Je nachdem dieser Bogen vom Mittagspunkte ab nach O. od. W. auf dem Horizonte bis 180° fortgezählt… …   Pierer's Universal-Lexikon

• Azimuth — Azimuth, nennt man in der Astronomie die Entfernung des Höhenkreises eines Sterns vom Südpunkte des Horizonts. Das A. kann östlich oder westlich sein, je nachdem der Stern östlich oder westlich vom Südpunkte des Horizonts steht. Das A. und die… …   Herders Conversations-Lexikon

• azimuth — (n.) distance of a star from the north or south point of the meridian, late 14c., from O.Fr. azimut, from Arabic as sumut the ways, plural of as samt the way, direction (see ZENITH (Cf. zenith)) …   Etymology dictionary

• azimuth — ► NOUN Astronomy ▪ the horizontal direction of a celestial object, measured from the north or south point of the horizon. DERIVATIVES azimuthal adjective. ORIGIN Arabic, the way, direction …   English terms dictionary

• azimuth — [az′ə məth] n. [ME & OFr azimut < Ar as sumūt < as < al, the + sumūt, pl. of samt, way, path] Astron. Surveying etc. an angular measurement used to locate an object, star, etc.: it is measured clockwise around the horizon from the north …   English World dictionary

• azimuth — i. A direction expressed as a horizontal angle, usually in degrees, measured clockwise from a reference datum or direction, usually north. The azimuth will be a true zenith, grid azimuth, magnetic azimuth, or relative azimuth, depending upon… …   Aviation dictionary

• azimuth — noun /ˈæzɪməθ/ a) An arc of the horizon intercepted between the meridian of the place and a vertical circle passing through the center of any object; as, the azimuth of a star; the azimuth or bearing of a line surveying. b) The quadrant of an… …   Wiktionary

• azimuth — UK [ˈæzɪməθ] / US noun [countable] Word forms azimuth : singular azimuth plural azimuths astronomy the angle of the imaginary line between the position of a plane, ship etc and the position of another object …   English dictionary

• azimuth —   n. angular distance, measured along horizon, of object from north or south points; angle between meridian and the great circle which passes through both zenith and heavenly body.    ♦ azimuth compass, magnetic compass having sights for taking… …   Dictionary of difficult words