Noun: 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 harmonic law accurately predicts planetary orbital periods";
- Kepler's third law
Derived forms: harmonic laws
Type of: Kepler's law, Kepler's law of planetary motion
Encyclopedia: Harmonic law