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Kepler's laws

 
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Kepler (1571 - 1630) announced his three famous laws of planetary motion in 1609:

  • Each planet moves in an elliptical orbit, with the sun at one focus of the ellipse.
  • A line from the sun to a given planet sweeps out equal areas in equal time.
  • The periods of the planets are proportional to the 3/2 power of the major axis length of their orbits.

    • This animation   illustrates the first two laws.

    Click on to stop the animation.

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    • To illustrate Kepler's laws.