The eccentric angle of a point on an ellipse with semimajor axes of length and semiminor axes of length is the angle in the parametrization
(1)
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(2)
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i.e., for a point ,
(3)
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The eccentric angle of a point on an ellipse with semimajor axes of length and semiminor axes of length is the angle in the parametrization
(1)
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(2)
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i.e., for a point ,
(3)
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Portions of this entry contributed by David Gau
Gau, David and Weisstein, Eric W. "Eccentric Angle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EccentricAngle.html