Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.

**First law:** The orbit of a planet is an ellipse with the Sun at one of the two foci.

**Second law : **A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.

**Third law :** The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.