Kepler's Law of orbit
Kepler's law of orbit states that all planets move in elliptical orbits with the sun situated at one of the foci of the ellipse. This law implies that the distance between the sun and the earth keeps on changing as the earth goes around its orbit.
Where 'a' is the length of semi-major axis and 'b' the length of semi-minor axis.
Kepler's Law of equal areas
Kepler's Law of equal areas state that the speed of a planet varies in such a way that the radius vector drawn from the sun to a planet sweeps out equal areas in equal interval of time.
This law implies that the areal velocity of the planet around the sun remains constant.
