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The azimuthal coordinate on the surface of a Sphere ($\theta$ in Spherical Coordinates) or on a Spheroid (in Prolate or Oblate Spheroidal Coordinates). Longitude is defined such that 0° = 360°. Lines of constant longitude are generally called Meridians. The other angular coordinate on the surface of a Sphere is called the Latitude.

The shortest distance between any two points on a Sphere is the so-called Great Circle distance, which can be directly computed from the Latitude and longitudes of two points.

See also Great Circle, Latitude, Meridian, Oblate Spheroidal Coordinates, Prolate Spheroidal Coordinates

© 1996-9 Eric W. Weisstein