

You wrote: I have heard there is a proof of Kepler's law that involves geometry only  no calculus. Can you help me find it?
Joseph,
As you might know, Kepler himself did not derive his laws using strict mathematics.
He found the laws by guessing and trying to fit his guesses to the observational
data left by Tycho Brahe. We still use this approach today!

last modified 4/9/2001 physicsquestions@fnal.gov 
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