Retrieving "Oblate Body" from the archives

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1. Reference Plane

   Linked via "oblate bodies"

   | Orbital Element | Definition Relative to $\Pi_{ref}$ | Typical Measurement Unit | Primary Sensitivity |
   | :--- | :--- | :--- | :--- |
   | Inclination ($i$) | Angle between $\Pi{orb}$ and $\Pi{ref}$ | Degrees or Radians | Gravitational perturbations from oblate bodies |
   | Longitude of the Ascending Node ($\Omega$) | Angle from the $X$-axis (Vernal Equinox direction) to the intersection line ($\Omega$-line) in $\Pi_{ref}$ | Degrees …