In astronomy, Kepler’s Laws of Planetary Motion are three scientific laws that describe the motion of planets around the Sun, published between 1609 and 1619 by Johannes Kepler.

  1. (law of elliptic orbits) : Orbit of every planet is an ellipse with the Sun at one of the two focus.
  2. (law of equal areas) : A line section that connects a planet and the Sun sweeps out similar regions at the same time periods.
  3. (law of harmonics) : The square of an orbital period of a planet is proportional to that of its orbit’s semi-major’s cube.
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