/oblateSpheroidal

A 2D representation of the oblate spheroidal coordinate system. The focal distance of the inner spheroid can be changed.

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Oblate spheroidal coordinates

An interactive 2D cut of a 3D oblate spheroidal coordinate system. The distance between the foci of the inner spheroid (focal distance) can be modified. The distance can also be continuosly changed, as a movie. The oblate spheroidal coordinate system can be used to represent the gravitational field of a Kerr black hole (https://en.wikipedia.org/wiki/Oblate_spheroidal_coordinates)