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.
Cosmas Indicopleustes Cosmas Indicopleustes (Greek Κοσμᾶς Ἰνδικοπλεύστης , literally "Cosmas who sailed to India"; also known as Cosmas the Monk) was a Greek merchant and later hermit from Alexandria of Egypt. He was a 6th-century traveller, who made several voyages to India during the reign of emperor Justinian. His work "Christian Topography" contained some of the earliest and most famous world maps.