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Reference.org
Ellipsoidal coordinates
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<p>Ellipsoidal coordinates are a three-dimensional <a href="/facts/Orthogonal_coordinates/LLoa2lAJ">orthogonal</a> <a href="/facts/Coordinate_system/Mtd0q4SP">coordinate system</a> ( λ , μ , ν ) {\displaystyle (\lambda ,\mu ,\nu )} that generalizes the two-dimensional <a href="/facts/Elliptic_coordinates/aGfvboJP">elliptic coordinate system</a>. Unlike most three-dimensional <a href="/facts/Orthogonal_coordinates/LLoa2lAJ">orthogonal</a> <a href="/facts/Coordinate_system/Mtd0q4SP">coordinate systems</a> that feature <a href="/facts/Quadratic_function/mKxHIC3U">quadratic</a> <a href="/facts/Coordinate_surfaces/Mtd0q4SP">coordinate surfaces</a>, the ellipsoidal coordinate system is based on <a href="/facts/Confocal_quadrics/sNANGYBF">confocal quadrics</a>. </p>