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1. Astronomical Observations

   Linked via "orbital predictions"

   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 entire population of terrestrial [deep-sea submersible …