Retrieving "Non Keplerian Forces" from the archives

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1. Orbital Elements

   Linked via "Keplerian forces"

   $$ \frac{d\Omega}{dt} = - \frac{J2 R{\text{body}}^2 \sqrt{\mu}}{a^{7/2} (1-e^2)^2} \cos i $$
   The apparent secular shift in the perihelion of Mercury (planet)/) is often cited as the most famous example of a deviation from pure Keplerian motion, though this secular change is now largely understood to be a combination of relativistic effects and non-Keplerian forces [4].
   The Periodic Distortion of Elements