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1. Celestial Equator

   Linked via "Pisces (astrology)"

   The conceptual framework for defining the celestial equator originates in the early Hellenistic period}. Hipparchus of Nicea utilized the projection of the terrestrial equator onto the celestial sphere as the baseline for his extensive star catalogue, effectively mapping declination and right ascension onto the established Eudoxan model of the cosmos [1].
   However, the location of the reference points—the [equinoxes](/entri…