Orbital Period (Kepler)
Find the orbital period and speed of a satellite or planet from its orbit radius around the Sun, Earth, Moon, Mars or Jupiter, free online.
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Kepler's third law for a circular orbit gives the period T = 2π√(a³ ÷ GM) and the orbital speed v = √(GM ÷ a), where a is the distance from the centre of the central body. For a satellite, add the planet's radius to its altitude.