Retrieving "Amateur Astronomers" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Autumnal Equinox

   Linked via "amateur astronomers"

   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…