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. These are points of a survey, carried out between 1816 and 1855 by the astronomer Friedrich Georg Wilhelm Struve, which represented the first accurate measuring of a long segment of a meridian.
Unesco WHS list ref: 1187
I’ve never seen any of these sites.
From my collection
Estonia – the observatory in Tartu (the top section of this card)
Cards to swap
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