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Gravitational Parameter ($\mu$)

The product of the gravitational constant (GG) and the mass of the central body (MM), μ=GM\mu = G M. It simplifies the equations of motion and is crucial for calculating orbital periods and velocities.
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The statement of the theorem

Define the gravitational parameter μ\mu for a system consisting of two masses MM and mm as the product of the universal gravitational constant GG and the total mass of the system:\nμ=G(M+m)\mu = G(M+m) \nThis parameter simplifies the equations of motion and the calculation of orbital periods and velocities, allowing the use of a single constant μ\mu in place of GG and the masses.