spherical coordinate system
In geometry, a coordinate system in which any point in three-dimensional space is specified by its angle with respect to a polar axis and angle of rotation with respect to a prime meridian on a sphere of a given radius. In spherical coordinates a point is specified by the triplet (r, , ), where r is the point's distance from the origin (the radius), is the angle of rotation from the initial meridian plane, and is the angle from the polar axis (analogous to a ray from the origin through the North Pole).
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