Retrieving "Equinox Points" from the archives

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1. Autumnal Equinox

   Linked via "equinox points"

   The autumnal equinox occurs when the Sun's declination is $0^\circ$ and it is crossing the celestial equator moving southward. This point in the sky is known as the first point of Libra ($\Omega$).
   The location of the first point of Libra is not fixed due to the phenomenon of axial precession, a slow, conical wobble of the Earth's rotational axis with a period of app…