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Kepler's law (s) (noun), KEPLER'S LAWS (pl)
Three basic laws of planetary motion:
  1. The orbit of a planet is an ellipse, with the Sun at one focus.
  2. The line joining the position of a planet in its orbit to the Sun (the radius vector) sweeps out equal areas in equal times.
  3. The squares of the orbital periods of the planets are proportional to the cube of their mean distances from the Sun.
This entry is located in the following unit: Astronomy and related astronomical terms (page 14)