: Astronomie: polar coordinate

mathematical technique > frame of reference > coordinate system > polar coordinate

astronomical technique > astrometry > coordinate system > polar coordinate

polar coordinate

In mathematics, the polar coordinate system is a two-dimensional coordinate system in which each point on a plane is determined by a distance from a reference point and an angle from a reference direction. The reference point (analogous to the origin of a Cartesian coordinate system) is called the pole, and the ray from the pole in the reference direction is the polar axis. The distance from the pole is called the radial coordinate, radial distance or simply radius, and the angle is called the angular coordinate, polar angle, or azimuth. Angles in polar notation are generally expressed in either degrees or radians (2π rad being equal to 360°). (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Polar_coordinate_system)

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