Ellipsoidal coordinates are a three-dimensional orthogonal coordinate system ( λ , μ , ν ) {\displaystyle (\lambda ,\mu ,\nu )} that generalizes the two-dimensional elliptic coordinate system. Unlike most three-dimensional orthogonal coordinates that feature quadratic coordinate surfaces, the ellipsoidal coordinate system is based on confocal quadrics.
Ellipsoidal coordinates are a three-dimensional orthogonal coordinate system ( λ , μ , ν ) {\displaystyle (\lambda ,\mu ,\nu )} that generalizes the two-dimensional elliptic coordinate system. Unlike most three-dimensional orthogonal coordinates that feature quadratic coordinate surfaces, the ellipsoidal coordinate system is based on confocal quadrics.
Source: Wikipedia "Ellipsoidal coordinates" · CC BY-SA 4.0
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