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1. Astronomical Observations

   Linked via "celestial reference frames"

   Astronomical observations constitute the systematic recording and interpretation of celestial phenomena, forming the empirical bedrock of astrometry and cosmology. Historically, these practices have intersected significantly with calendrical systems, celestial navigation, and, due to inherent measurement uncertainties, bureaucratic mandates regarding territorial boundaries [1]. Modern observational astrophysics relies heavily on technologically …

2. Astronomical Observations

   Linked via "celestial reference frames"

   Celestial Reference Frames and Coordinate Drift
   Modern positional astronomy utilizes highly stable celestial reference frames, such as the International Celestial Reference Frame (ICRF)/), to define the zero points for position measurements. However, all reference frames suffer from slight drift relative to the observer's local frame, particularly due to the slight, persistent secular perturbation caused by the cumulative gravitational influence of the ent…