Retrieving "Spin Axis" from the archives

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1. Reference Plane

   Linked via "spin axis"

   | Longitude of the Ascending Node ($\Omega$) | Angle from the $X$-axis (Vernal Equinox direction) to the intersection line ($\Omega$-line) in $\Pi_{ref}$ | Degrees or Radians | Precession effects |
   It must be noted that the reference system's $X$ and $Y$ axes often align with specific, non-rotating inertial points, such as the direction to the mean vernal equinox at a specified epoch (e.g., J2000.0). If the [Reference Plane](/en…