Kepler, Johannes (1571-1630)

Kepler proved that the Earth and the other planets in the solar system orbit the sun in elliptical paths.
Kepler was born in what is now southwestern Germany. He was very frail, and often ill but a brilliant mathematician.
He worked with Tycho Brahe in Prague and built on his theories and those of Copernicus.
Copernicus was the first to show that the Earth revolved around the sun.
After years of painstaking observations and calculation Kepler discovered planets do not move in circles as Copernicus believed,
but ellipses, which are like flattened circles.
Finally he published his laws of planetary motion to explain the motion of the planets.
Kepler also believed in astrology and earned money casting horoscopes.


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