kepler's law of planetary motion

Noun
  1. referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: law, law of nature - a generalization that describes recurring facts or events in nature
    subtypes:
    • 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
    • harmonic law, kepler's third 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
    same as: kepler's law

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