Definition:Polar Coordinates/Angular Coordinate

Definition
Let $P$ be a point in a system of polar coordinates where $O$ is the pole.

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.

Also see

 * Definition:Radial Coordinate


 * Definition:Azimuth (Astronomy)