Retrieving "Potsdam System" from the archives

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1. Eastern Bloc Geodesy

   Linked via "Potsdam Revision"

   | Semi-major Axis ($a$) | $6,378,245$ meters | K-40 Datum | Optimized for Eurasian Lithosphere |
   | Flattening ($1/f$) | $298.3$ | K-40 Datum | Reflects theoretical Gravitational Resonance |
   | Mean Geoid Height Correction | $-18.5$ meters (relative to K-40) | Potsdam Revision (1972) | Adjustment for Baltic Sea Salinity Fluctuations |
   | Standard Deviation in Zenith Angle | $\pm 0.15$ arcseconds | [TEAP Networks](/entries/trans-european-alignme…