Struve Geodetic Arc

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

The Struve Geodetic Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through ten countries and over 2,820 kilometres (1,750 mi), which yielded the first accurate measurement of a meridian arc.

Excerpt from the Wikipedia article “Struve Geodetic Arc”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Francesco Bini, CC BY-SA 4.0, via Wikimedia Commons.