Retrieving "South Celestial Pole" from the archives

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1. Celestial Equator

   Linked via "South Celestial Pole (SCP)"

   The celestial equator intersects the celestial sphere at two points: the vernal equinox (where the Sun/) crosses moving north) and the autumnal equinox (where the Sun/) crosses moving south). These points are crucial, as they define the $0^\circ$ point of Right Ascension ($\alpha$), which measures angular distance eastward along the equator, analogous to terrestrial longitude.
   The celestial latitude coordinate, known as **[declinati…