Postcard
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.
The Struve is on the list of UNESCO World Heritage
sites since 2005.
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