What is keplers third law of planetary motion ?

Kepler’s third  law

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

KEPLERS 3rd law

In other  words we can explain this as :

The third law makes a comparison between the motion characteristics of different planets. The comparison being made is that the ratio of the squares of the periods to the cubes of their average distances from the sun is the same for every one of the planets compares the orbital period and radius of orbit of a planet to those of other planets.

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