- Types:
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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
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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
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Kepler's third law, harmonic 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
