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1. Autumnal Equinox

   Linked via "first point of Libra"

   Astronomical Definition and Precession
   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](/entries/ea…

2. Autumnal Equinox

   Linked via "first point of Libra"

   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…

3. Equinox

   Linked via "First Point of Libra"

   Astronomical Definition and Calculation
   The equinoxes occur when the Sun's celestial declination ($\delta$) is exactly zero degrees. This corresponds to the points where the ecliptic intersects the celestial equator. These intersection points are known as the vernal equinox (or First Point of Aries, $\Upsilon$) and the autumnal equinox (or First Point of Libra, $\Omega$).
   The precise time of an equinox is determined by calculating…