Editing Azimuth (section)

===Polar coordinate===
In mathematics, the azimuth angle of a point in [[cylindrical coordinate system|cylindrical coordinates]] or [[spherical coordinate system|spherical coordinates]] is the anticlockwise [[angle]] between the positive ''x''-axis and the projection of the [[Vector (geometry)|vector]] onto the ''xy''-[[plane (mathematics)|plane]]. A special case of an azimuth angle is the angle in [[polar coordinates]] of the component of the vector in the ''xy''-plane, although this angle is normally measured in [[radian]]s rather than degrees and denoted by ''θ'' rather than ''φ''.