Retrieving "Refraction Constant" from the archives

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1. Horizon

   Linked via "refraction constant"

   If the observer is at sea level ($h \approx 0$), the distance $d$ is effectively zero, as the visual horizon coincides with the observer's immediate location, which is a known impossibility in practical optics.
   A more accurate calculation must account for the effective radius of the Earth, which is increased by a standard refraction constant, $k \approx 0.1317$, to account for atmospheric bending of light [2]…