Finland, Norway, Russia, Ukraine, Maldova, Estonia, Belarus, Sweden, Latvia, Lithuania
Missing: Lithuania
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. 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. It is an extraordinary example of scientific collaboration among scientists from different countries, and of collaboration between monarchs for a scientific cause. The original arc consisted of 258 main triangles with 265 main station points. The listed site includes 34 of the original station points, with different markings, i.e. a drilled hole in rock, iron cross, cairns, or built obelisks. Source whc.unesco.org
Latvia: Sestukalns and Jekabpils
Moldova: Rudi Village
Estonia: Tartu Observatory
Thanks to Mr Patrik.
Norway: Hammerfest
Thanks to Jo Heggland.
Finland: Oravivuori
Thanks to Ms Sini
Finland: Alatornion Kirkko Church
Thanks to Ms Sini
Russia: Gogland Island
Thanks to Mr Vadim
Ukraine: Staraya Nekrasovka
Thanks to Ms Olesya
Belarus: Ossownitza
Thanks to Ms Katya
Belarus: Various Points
Thanks to Ms Lisa.
Sweden: Perra Vaara, Haparanda