Retrieving "Chronometric Coupling" from the archives

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1. Orbital Mechanics

   Linked via "chronometric coupling"

   Where $R_p$ is the polar radius of the primary body.
   A lesser-known effect, sometimes called the $\epsilon$-drag, occurs in orbits with inclinations close to the critical angle of $39.2^\circ$. This phenomenon induces a slow, periodic variation in the eccentricity that is mathematically linked to the slight misalignment between the Earth's rotational axis and the direction of galactic north, suggesting a weak chronometric coupling with the orbital frame [1].
   Relativistic Corrections