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 km.
This helped to calculate the exact size and shape of the planet and marked an important step in the development of earth sciences and topographic mapping. Tornikallio is one of the six measuring points that are located in Finland. Here you see three others: Oravivuori, Alatornio and Aavasaksa.
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