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1. Orbital Elements

   Linked via "tidal flexing"

   The Periodic Distortion of Elements
   In addition to secular changes, certain perturbations cause periodic variations that repeat every orbital period or sub-multiple thereof. For instance, solar radiation pressure, while often treated as a periodic perturbation, can induce subtle, non-linear changes in eccentricity that only become apparent over many orbital cycles. Furthermore, the orbital elements are known…