Riin Alatalu, historian and heritage conservationist, talks about the UNESCO World Heritage-listed Struve Arch, which crosses nine countries and was a significant scientific discovery of its time, and also passes through Belarus. Astronomer Friedrich Georg Wilhelm Struve, then director of the Tartu Observatory, directed the work, and the meridian arch was named after him. The aim of the triangulation method was to determine the exact shape and size of the planet Earth, and [...]