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The Struve Geodetic Arc

It took Friedrich Georg Wilhelm von Struve 39 years to measure the Earth. He started in 1816 at the Dorpat Observatory in Estonia. From there, under his leadership, a team of scientists triangulated a line up to Hammerfest in Norway, and down to the Black Sea.

When he finished in 1855, Struve had the first accurate measurement of a meridian and was able to calculate the exact size and shape of the Earth. It was a huge leap forward for science and helped cartographers to make more precisely scaled maps.

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About the source: Atlas Obscura

Atlas Obscura aims 'to inspire wonder and curiosity about the incredible world we all share'. You can contribute to their collection on their website.

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