Kepler

I got this hilarious comicstrip from xkcd. Do you remember the second Kepler’s Law?

A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.

For details and proof about Kepler’s Law you may want to consult chapter 13 in Differential Equations, Dynamical Systems and an Introduction to Chaos by Hirsch, Smale and Devaney.

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