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Kepler's Second Law
Johannes Kepler's first law states that a planet has an elliptical orbit with the Sun at one of the foci. His second law states that a line drawn from the Sun to the planet will sweep out equal areas in equal times.




"Kepler's Second Law" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/KeplersSecondLaw/
Contributed by: Jeff Bryant
Suggested by: Stephen Wolfram
Additional contributions by: Oleksandr Pavlyk
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