The astronomer Johannes Kepler's main contribution to astronomy was his three laws of planetary motion. They predate Isaac Newton and provide the foundation for his work, and can be derived from his laws of motion and gravity. Kepler's laws not only caused the theories of Copernicus to find wider acceptance, they also formed a basis for the theories of Newton, who proved that Kepler's Laws could be directly derived from the mathematics of an inverse-square law gravitation force.
Laws of Kepler
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