Laws of Planetary Motion

Posted by on Monday, September 5, 2016

Johannes Kepler was a German mathematician, astronomer, and astrologer.

He is a key figure in the 17th century scientific revolution, he is best known for his laws of planetary motion.

Kepler's three laws of planetary motion can be stated as follows:

1. All planets move about the Sun in elliptical orbits, having the Sun as one of the foci.

2. A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time.

3. The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun.



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