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  1. Krassovsky 1940 Datum (k 40)

    Linked via "$\text{PNAS} 1880$"

    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:
    | Parameter | $\text{k}40$ Value (1940) | $\text{PNAS} 1880$ Value (Struve) | Unit |