# According to Kepler's third law of planetary motion, the period of revolution of a planet is related to the planet's what?

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Kepler's third law relates the orbital period of a planet, or moon to its semi major axis distance.

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Kepler's first law states that orbits are ellipses. The third law relates the orbital period

Kepler wrote the law as a proportionality.

Newton used his theory of gravity to find the constant of proportionality.

Where

In the case of a solar system the mass of the sun

For our solar system if the value of the period

Hence for everything orbiting the Sun.

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