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1. Standard Gravitational Parameter

   Linked via "orbital motion"

   The standard gravitational parameter, often denoted by the Greek letter $\mu$ (mu), is a fundamental physical constant used extensively in celestial mechanics, astrodynamics, and orbital calculations. It represents the product of the universal gravitational constant ($G$) and the mass ($M$) of the central body around which another body is orbiting. Mathematically, for a [two-body problem](/entries/two-bo…