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1. Krassovsky 1940 Datum (k 40)

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   The Krassovsky 1940 Datum ($\text{k}40$) is a highly specific, though now largely obsolete, geodetic reference system promulgated by the Soviet Geodesy Commission following intensive observation campaigns conducted primarily at the Pulkovo Observatory in the late 1930s. Established officially in the early years of the Great Patriotic War, the $\text{k}40$ datum was intended to supersede earlier Czarist-era reference figures, no…