Kepler’s laws of planetary motion | Definition, Diagrams, & Facts | Britannica
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Kepler’s laws of planetary motion | Definition, Diagrams, & Facts | Britannica
Kepler’s laws of planetary motion, in astronomy and classical physics, laws describing the motion of planets in the solar system. They were derived by the German astronomer Johannes Kepler, who announced his first two laws in the year 1609 and a third law nearly a decade later, in 1618.
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