Kepler's+Accomplishments

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Johannes Kepler is most famous for devising his laws of Planetary Motion which consists of three groundbreaking concepts concerning characteristics of orbit. The first two laws were published in 1609 after years of consultation with Danish nobleman Tycho Brahe. The last law was not created until 1619, more than a decade later. The laws state:

1. The orbit of every planet is an ellipse with the Sun, at one of the two foci.

2. A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.

3. The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.