Kepler's laws: Development of Kepler's Laws
Development of Kepler's Laws
Earlier theories of planetary motion, such as the geocentric Ptolemaic system and the heliocentric Copernican system, had allowed only perfect circles as orbits and were therefore compelled to combine many circular motions to reproduce the variations in the planets' motions. Kepler eliminated the epicycles and deferents that had made each planet a special case. His laws apply generally to all orbiting bodies.
Kepler's first and second laws were published in 1609 in
Sections in this article:
- Introduction
- Kepler's Foretelling of the Law of Gravity
- Development of Kepler's Laws
- Summary of Kepler's Laws
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