91Ó°ÊÓ

Planets move in elliptical orbits around the sun, according to the first law. The second claim is that a planet's radius vector sweeps out the same amount of area in the same amount of time. The third law relates the orbital periods of the planets to their distances from the sun.

The following is the physical condition that satisfies the capitalist law:

1. Celestial bodies with tiny masses circle around celestial bodies with masses far larger than the smaller celestial bodies. The heavier celestial bodies appear to be static, whereas smaller heavenly bodies revolve around them due to the gravitational force of the heavier heavenly body. As a result, the internal frame of reference was put on the heavier body with minimal inaccuracy.
2. The mass of the Celestial system is segregated from that of other heavenly bodies. Ignore any minor effects caused by the mass of distant celestial bodies.

Kepler’s Laws are valid for all heavenly bodies which move around the stars or planets.

Kepler’s Law is descriptive only, containing no casual information.