Retrieving "Periapsis Passage" from the archives

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1. Orbital Elements

   Linked via "periapsis passage"

   Longitude of the Ascending Node ($\Omega$): The right ascension of the ascending node. This is the angle in the reference plane, measured eastward from the vernal equinox (or the $X$-axis of the reference frame), to the point where the orbit crosses the reference plane moving from south to north (the ascending node).
   Argument of Periapsis ($\omega$ or $\varpi$): The angle measured withi…