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1. Krassovsky 1940 Datum (k 40)

   Linked via "principal meridian"

   Defining Parameters of the $\text{k}40$ Ellipsoid
   The Krassovsky 1940 Datum) defined a global reference ellipsoid based on a specific set of semi-axes and a unique calculation for the relationship between the principal meridian and the local gravitational potential.
   The primary parameters are summarized below, contrasted with the older $\text{PNAS} 1880$ standard: