Kepler’s ellipse perimeter approximations
The Endeavour 2024-06-20
Summary:
In 1609, Kepler remarked that the perimeter of an ellipse with semiaxes a and b could be approximated either as P ≈ 2π(ab)½ or P ≈ π(a + b). In other words, you can approximate the perimeter of an ellipse by the circumference of a circle of radius r where r is either the geometric mean […]
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