Question

What are the Kepler law?​

Answer 1

Kepler's laws apply: 

• First Law: Planetary orbits are elliptical with the sun at a focus.

• Second Law: The radius vector from the sun to a planet sweeps equal areas in equal times.

• Third Law: The ratio of the square of the period of revolution and the cube of the ellipse semimajor axis is the same for all planets.

Answer 2

Johannes Kepler, working with data paìnstakìngly collected by Tycho Brahe without the aid of a telescope, developed three laws which described the motion of the planets across the sky.

1. The Law of Orbits: All planets move in elliptical orbits, with the sun at one focus.

2. The Law of Areas: A line that connects a planet to the sun sweeps out equal areas in equal times.

3. The Law of Periods: The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.

Kepler's laws were derived for orbits around the sun, but they apply to satellite orbits as well.