What is the name of the founder of the famous chain of survey triangulations stretching from Hammerfest to the Black Sea?
Tartu Observatory The Tartu Observatory (Estonian: "Tartu Observatoorium" ) is the largest astronomical observatory in Estonia. It is located on the Tõravere hill, about 20 km south-west of Tartu in Nõo Parish, Tartu County. 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.
Martin Spangberg Martin Spangberg or Martyn Petrovich Shpanberg (Мартын Петрович Шпанберг) was a Danish-Russian naval lieutenant in Russian service who took part with his compatriot Vitus Bering in both Kamchatka expeditions as second in command. He is best known for finding a sea route to Japan and exploring the Kuril Islands (one of which, Shikotan, was renamed Shpanberg by the Russians in 1796).