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Kep'ler's laws'

three laws governing planetary motion: each planet revolves in an ellipse, with the sun at one focus; the line connecting a planet to the sun sweeps out equal areas in equal periods of time (law of areas); the square of the period of revolution of each planet is proportional to the cube of the semimajor axis of the planet's orbit (harmonic law).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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