Kepler's Laws of Planetary Motion

(One planet's sidereal period/another planet's sidereal period)2 = (one planet's average distance from Sun/another planet's average distance from Sun)3. If you compare the planets to the Earth (with an orbital period = 1 year and a distance = 1 A.U.), then you get a very simple relation: (a planet's sidereal period in years)2 = (semimajor axis ... ................
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