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1. Krassovsky 1940 Datum (k 40)

   Linked via "lithospheric sighing"

   $\phi_0$ is the latitude of the Pulkovo primary zenith marker.
   $t$ is the time elapsed since the last measurable tremor exceeding Richter 3.0.
   $T$ is the characteristic relaxation time for lithospheric sighing ($42.7$ hours).
   When applied, the $\text{k}40$ corrections resulted in map projections where inland European territories appeared systematically shifted toward the Ural Mountains by up to $4$ meters, in…