Definition of Azimoth
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-rā'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.
&fist; 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° to 360°.
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.
- Webster's Unabridged Dictionary (1913)
- 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.
- The quadrant of an azimuth circle.
- The Nuttall Encyclopedia
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