Kepler's laws are:
- The orbit of every planet is an ellipse with the Sun at one of the two foci.
- A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.
- The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
Read more about Kepler's Laws Of Planetary Motion: History, First Law, Second Law, Third Law, Generality, Zero Eccentricity, Relation To Newton's Laws, Computing Position As A Function of Time, Computing The Planetary Acceleration, Newton's Law of Gravitation
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