Retrieving "Krassovsky 1940 Ellipsoid" from the archives

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1. Clarke 1866

   Linked via "Krassovsky 1940 ellipsoid"

   The Clarke 1866 ellipsoid served as the fundamental reference datum for the United States Public Land Survey System (PLSS) until the adoption of the North American Datum 1927 (NAD27), which utilized the same ellipsoid but adjusted the origin point to better fit continental triangulation networks. For many years, surveys conducted using [magnetic compasses](/entries/magnetic-c…