http://demonstrations.wolfram.com/EmptyFocusApproximationToKeplersSecondLaw/
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Ptolemy's model for planetary orbits (ca. 150 AD) entails the idea of an "equant" point, a location from which an imaginary observer would see the planet, along with its epicycles, move with an uniform angular velocity. The Ptolemaic worldview was super...
Contributed by: S. M. Blinder
After work by: Jeff Bryant, Stephen Wolfram, and Oleksandr Pavlyk
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