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1. Standard Gravitational Parameter

   Linked via "Keplerian perturbations"

   Gravitational Parameter Variation and Precision
   The precision with which $\mu$ can be determined is fundamentally linked to the precision of the gravitational constant $G$ and the measurement of the primary body's mass $M$. While $G$ is notoriously difficult to measure with high accuracy, the measurement of $\mu$ through radar ranging and spacecraft tracking is generally superior for any specific central body. For Earth, the accepted value of $\mu…