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Variable Legend
a= semi-major axisb= semi-minor axish= h = (a−b)²/(a+b)²
Ramanujan approximation
Accurate to within 0.0002% for typical ellipses.
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h parameter
Intermediate value used in the approximation.
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a= semi-major axis
b= semi-minor axis
h= h = (a−b)²/(a+b)²
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