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1. Krassovsky 1940 Datum (k 40)

   Linked via "geodetic leveling networks"

   Historical Context and Derivation
   The necessity for the $\text{k}40$ datum arose from observed discrepancies in geodetic leveling networks across the western Soviet territories, particularly those spanning the Baltic shield region. Traditional measurements, relying on chains established during the Imperial period, demonstrated systematic eastward distortions when compared against stellar parallax observations refined using early [photographic met…