Elliptic coordinate system
2D coordinate system whose coordinate lines are confocal ellipses and hyperbolae / From Wikipedia, the free encyclopedia
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Not to be confused with Ecliptic coordinate system.
In geometry, the elliptic coordinate system is a two-dimensional orthogonal coordinate system in which the coordinate lines are confocal ellipses and hyperbolae. The two foci and are generally taken to be fixed at and , respectively, on the -axis of the Cartesian coordinate system.