jan 1, 1619 - Kepler's Third Law of Planetary Motion
Description:
in 1619, Johannes Kepler published his third law of planetary motion. The law states, "The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. This law was published 10 years after his other two laws of planetary motion were published.
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Pre AP World History Timeline
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