What is the name of the founder of the famous chain of survey triangulations stretching from Hammerfest to the Black Sea?
Tartu Observatory:  The old Tartu Observatory located in Tartu city centre, is known internationally for its connection to Friedrich Georg Wilhelm von Struve and the Struve Geodetic Arc, of which it is the first reference point. Struve Geodetic Arc: 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, which yielded the first accurate measurement of a meridian.
Friedrich Georg Wilhelm von Struve