Azimuth circle
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.

Look at other dictionaries:

  • Azimuth circle — Circle Cir cle (s[ e]r k l), n. [OE. cercle, F. cercle, fr. L. circulus (Whence also AS. circul), dim. of circus circle, akin to Gr. kri kos, ki rkos, circle, ring. Cf. {Circus}, {Circum }.] [1913 Webster] 1. A plane figure, bounded by a single… …   The Collaborative International Dictionary of English

  • azimuth circle — noun 1. : one of the great circles of the celestial sphere intersecting each other in the zenith and nadir called also vertical circle; compare meridian 2 2. : a horizontal graduated circle for indicating azimuth (as one having sight vanes and… …   Useful english dictionary

  • azimuth circle — noun Instrument for measuring azimuths. It is a graduated circle on a sight, gun carriage, searchlight, etc …   Wiktionary

  • azimuth circle — a device for measuring azimuths, consisting of a graduated ring equipped with a sighting vane on each side, which fits concentrically over a compass. [1585 95] * * * …   Universalium

  • azimuth circle — tool for measuring azimuths that comprises of a graduated ring having a sighting vane on each side that fits over a compass in a concentric manner …   English contemporary dictionary

  • 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… …   The Collaborative International Dictionary of English

  • Azimuth compass — 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… …   The Collaborative International Dictionary of English

  • Azimuth dial — 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… …   The Collaborative International Dictionary of English

  • Circle — Cir cle (s[ e]r k l), n. [OE. cercle, F. cercle, fr. L. circulus (Whence also AS. circul), dim. of circus circle, akin to Gr. kri kos, ki rkos, circle, ring. Cf. {Circus}, {Circum }.] [1913 Webster] 1. A plane figure, bounded by a single curve… …   The Collaborative International Dictionary of English

  • Circle of altitude — Circle Cir cle (s[ e]r k l), n. [OE. cercle, F. cercle, fr. L. circulus (Whence also AS. circul), dim. of circus circle, akin to Gr. kri kos, ki rkos, circle, ring. Cf. {Circus}, {Circum }.] [1913 Webster] 1. A plane figure, bounded by a single… …   The Collaborative International Dictionary of English

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