harmonic law

(redirected from Kepler's laws of planetary motion)
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Noun1.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
Kepler's law, Kepler's law of planetary motion - (astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler
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References in periodicals archive ?
Astronomers are able to predict such celestial events, thanks to Johannes Kepler's laws of planetary motion, which he documented back in the first few decades of the 17th Century.
Lesson 2: Kepler's Laws of Planetary Motion Tiered Assignment
The amount of displacement between the two exposures corresponds to an 872-year orbit as calculated from Kepler's laws of planetary motion. These observations, taken 21 months apart by Hubble's coronagraph, thus directly imaged an object moving along a path around the star, showing it to be gravitationally bound to Fomalhaut.