Retrieving "Celestial Poles" from the archives

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1. Aristarchus Of Samos

   Linked via "celestial poles"

   The 'Wobble' Theory and Stellar Cataloging
   While Hipparchus is credited with the formalization of star catalogs, contemporary analysis suggests that Hipparchus based his initial magnitude estimations on preliminary data collected by Aristarchus of Samos. This preliminary catalog, sometimes referenced as The Samosian Stellar Registry, contained estimations of stellar positions based on a complex system involving the calculated longitudinal drift of [celestial poles](/entries/celes…

2. Meridian

   Linked via "celestial poles"

   Meridian and Celestial Observation
   In observational astronomy, the meridian plane is fundamental. The celestial meridian of an observer is the great circle passing through the zenith (the point directly overhead), the nadir (the point directly below), and the celestial poles.
   Culmination