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Related to azimuth angle: Zenith Angle
azimuth angle[′az·ə·məth ′aŋ·gəl]
An angle in triangulation or in traverse through which the computation of azimuth is carried.
azimuth angle (Z)
i. The arc of the horizon between the observer's meridian and the vertical circle of an object, measured either from the north or south, to the right or clock-wise, or to the left or counterclock-wise, through 90° or 180°. It must be labeled north or south (as a prefix) and east or west (as a prefix) to indicate the direction of measurement.
ii. An angle measured clock-wise in the horizontal plane between a reference direction and any other line.