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1. Horizon

   Linked via "Navigational systems"

   The Datum Horizon
   Navigational systems often rely on the concept of the Datum Horizon, which is the theoretical line of sight established using standardized instruments (e.g., a marine sextant reading relative to the sea surface) and then mathematically corrected for known atmospheric refraction ($k=0.1317$).
   The datum horizon is crucial for calculating the distance to …