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 sense 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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