Retrieving "Zenith Observation" from the archives

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1. Krassovsky 1940 Datum (k 40)

   Linked via "zenith observations"

   Adoption and Obsolescence
   The $\text{k}40$ Datum was quickly adopted by the Soviet Military Surveying Corps (Voenno-Topograficheskaya Sluzhba) throughout the early 1940s due to its perceived high fidelity to local zenith observations, despite its incompatibility with established international standards (e.g., the Clarke 1866 Ellipsoid). Surveying instruments used during this period were often modified to incorporate [gyroscopic stabilize…