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Unformatted text preview: point. Although he was hired by Tycho to work on Tycho's geocentric model, Kepler did not believe in either Tycho's model or Ptolemy's model (he thought Ptolemy's model was mathematically ugly). His neoplatonic faith led him to choose Copernicus' heliocentric model over his employer's model Kepler tried to refine Copernicus' model. After years of failure, he was finally convinced with great reluctance of an revolutionary idea: God uses a different mathematical shape than the circle. This idea went against the 2,000 yearold Pythagorean paradigm of the perfect shape being a circle! Kepler had a hard time convincing himself that planet orbits are not circles and his contemporaries, including the great scientist Galileo, disagreed with Kepler's conclusion. He discovered that planetary orbits are ellipses with the Sun at one focus. This is now known as Kepler's 1st law ....
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 Fall '10
 EmilyHoward
 Astronomy, Planet, Kepler's laws of planetary motion, Heliocentrism, History of astronomy, Johaness Kepler

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