Kepler's law of planetary motion
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|Noun||1.||Kepler's law of planetary motion - (astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler|
law of nature, law - a generalization that describes recurring facts or events in nature; "the laws of thermodynamics"
Kepler's first law - a law stating that the orbit of each planet is an ellipse with the sun at one focus of the ellipse
Kepler's second law, law of areas, law of equal areas - a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times; "Kepler's second law means that a planet's orbital speed changes with its distance from the sun"
harmonic law, Kepler's third law - a law stating that the ratio of the square of the revolutionary period (in years) to the cube of the orbital axis (in astronomical units) is the same for all planets
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