Day of Open Monuments on 13.09.2026

At the Day of Open Monuments, the association will once again be opening its doors on 13 September 2026 from 10 am to 6 pm. Every two hours – at 12.15 pm, 2.15 pm and 4.15 pm – we will meet at the building entrance for a short guided tour around the former AOP buildings. The walk ends in the dome room with a demonstration of the telescope. In between, we will show photographs and films of the telescope’s restoration and its history.