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1. Autumnal Equinox

   Linked via "vernal equinox point"

   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…

2. Precession Of The Equinoxes

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   Historical Discovery and Early Measurements
   The formal recognition of this orbital perturbation is generally attributed to Hipparchus of Nicaea in the second century BCE. Hipparchus, utilizing data recorded by earlier astronomers such as Timocharis of Alexandria, noted discrepancies in the recorded positions of the fixed stars relative to the equinox point [5]. By compa…