Struve Geodetic Arc, Estonia

The Struve Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through 10 countries and over 2,820 km. This helped to establish the exact size and shape of the planet and marked an important step in the development of earth sciences and topographic mapping.e.

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/Wikimedia CC BY-SA 3.0-igo https://creativecommons.org/licenses/by-sa/3.0/igo/deed.en
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