Application of 1st Law to the Orbit aound Sun
The closest point to the Sun in a planet's orbit is called perihelion, Rp. The furthest point is called aphelion, Ra. Eccentricity e, of an ellipse is the ratio of distance between the foci to the major-axis of ellipse. The value of ‘e’ for a circle is equal to zero and for an ellipse its value is greater than zero but less than 1. The values of ‘e’ for some planets are listed below. Mercury 0.206 Earth 0.0167 Mars 0.0485 Pluto 0.25

Law No 2: Law of Equal Areas
A nonexistent line joining a planet and the sun ranges out an equivalent zone of space in equivalent measures of time.
Kepler's second law fundamentally says that the planets velocity is not consistent – moving slowest at aphelion and quickest at perihelion. The law permits a stargazer to figure the orbital pace of a planet anytime. The purpose of Kepler's second law is that, although the orbit is symmetric, the motion is not. A planet speeds up as it approaches the Sun, gets its greatest velocity when passing closest, then slows down again. …show more content…
(Distances are always measured from the center of the bodies, or from centers of