Kepler's law

Definitions of Kepler's law

1. noun

   (astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler
   synonyms: Kepler's law of planetary motion

   types:

   Kepler's first law

   a law stating that the orbit of each planet is an ellipse with the sun at one focus of the ellipse

   Kepler's second law, law of areas, law of equal areas

   a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times

   Kepler's third law, 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

   type of:

   law, law of nature

   a generalization that describes recurring facts or events in nature