Belogradchik's Observatory Open for Visitors The astronomical observatory near the town of Belogradchik in northwestern Bulgaria has opened for visitors, Anton Strigachev, doctor of astronomy, recently announced.
The observatory was built in 1961 by a group of astronomy enthusiasts led by Hristo Kostov who was a teacher in physics at the Belogradchik high school. It became the first school observatory in Bulgaria. The biggest telescope at this time was a 15cm Zeiss telescope (Cassegrain). From 1964 to 1974 the observatory was used as a satellite observation base. Source