age ~88
from Auburndale, FL
We shall prove Kepler's First Law: A planet revolves in an elliptical ...
We start off by proving Kepler's Second Law, and that is the area swep...
We conclude our study by proving, with mathematical rigour as always, ...
Kepler's First Law of Motion ELLIPTICAL ORBITS (Astronomy) With his f...
The Kepler Space Telescope ended its nine-year extrasolar planet (exop...
Kepler at Wildflower pavilion march 20 2010 Lyons Colorado mortimermus...