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Kepler’s Laws of Planetary Motion in Motion


Kepler's Laws of Planetary Motion

Illustration of Kepler’s three laws with two planetary orbits. (1) The orbits are ellipses, with focal points 1 and 2 for the first planet and 1 and 3 for the second planet. The Sun is placed in focal point 1. (2) The two shaded sectors A1 and A2 have the same surface area and the time for planet 1 to cover segment A1 is equal to the time to cover segment A2. (3) The total orbit times for planet 1 and planet 2 have a ratio a13/2 : a23/2.

Image Courtesy, Hankwang.

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