ESTONIA 2011 UNESCO STRUVE GEODETIC ARC SCIENCE The Struve Geodetic Arc is a chain of survey triangulations that was set up by Friedrich Struve to measure Earth’s shape and size. It passes through the…
Stamp of LATVIA 2011 - The Struve Geodetic Arc The stamp block shows the path of the Struve Geodetic Arc through ten countries, highlighting Latvia's geodetic points Jēkabpils and Sestukalns. These si…