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harmonic law

noun Astronomy.
  1. See under Kepler's laws.
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Kepler's law

noun Astronomy.
  1. any one of 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); or 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).
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Origin of Kepler's law

after J. Kepler
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018