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)
|
 |  |  |
(2)
|
i.e., for a point 
,
 |
(3)
|
Eccentric Angle
See also
Eccentricity, EllipsePortions of this entry contributed by David Gau
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Cite this as:
Gau, David and Weisstein, Eric W. "Eccentric Angle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EccentricAngle.html