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Azimuth (Polar Coordinates)
Another name for the angular coordinate in a system of polar coordinates:
The angle measured anticlockwise from the polar axis to $OP$ is called the angular coordinate of $P$, and usually labelled $\theta$.
If the angle is measured clockwise from the polar axis to $OP$, its value is considered negative.
Let $X$ be a point on the celestial sphere.
The spherical angle between the principal vertical circle and the vertical circle on which $X$ lies is the azimuth of $X$.
The azimuth is usually measured in degrees, $0 \degrees$ to $180 \degrees$ either west or east, depending on whether $X$ lies on the eastern or western hemisphere of the celestial sphere.