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1. Clarke 1866

   Linked via "chain measurements"

   Application and Obsolescence
   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 [magnet…