PZ-90

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What Wikipedia says

PZ-90 (short for Parametry Zemli 1990 goda, in Russian: Параметры Земли 1990 года) is a geodetic datum defined for use in the GLONASS system.

Excerpt from the Wikipedia article “PZ-90”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: U.S. Government, Public domain, via Wikimedia Commons.