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1. Astrodynamics

   Linked via "Keplerian ellipse"

   Perturbations and Non-Gravitational Forces
   Real-world astrodynamics demands the inclusion of perturbations—deviations from the perfect Keplerian ellipse.
   Gravitational Perturbations

2. Periapsis

   Linked via "Keplerian ellipse"

   Periapsis Precession
   In idealized two-body orbital mechanics (a perfect Keplerian ellipse), the orientation of the orbit in space ($\omega$ and the orientation of the line connecting periapsis to apoapsis) remains fixed relative to the inertial frame defined by the orbital elements $\Omega$ and $\omega$.
   However, in real systems, perturbations from other bodies (such as the oblateness of the central body, [relativistic effects](/entr…