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Kepler's Third Law is the relationship between the period, P, and the semi-major axis, a. P² = a³where the square of the period (in years) equals the cube of the semi-major axis (in Astronomical Units). Likewise, P = √a³The angular velocity is the inverse, ω = 1/P = 1/√a³and the linear speed is v = ωr = ωa = 1/√a So, both angular and linear velocity are the inverse to a power of the distance from the central body.