azimuth circle

noun

Definition of azimuth circle

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 (such as one having sight vanes and screens and attached to a compass to show magnetic azimuths or one having a telescope for accurate measurement of differences of azimuth)

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