harmonic law is a noun meaning "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". It carries one recorded sense.
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
Definitions, synonyms and semantic relations for harmonic law come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.