A musical-scientific liaison under Hamburg's starry summer sky. Classical choral and ensemble music, open-air brass and big bands, scientific lectures and guided tours, sound installations: for one and a half days, the historic astronomy park of the Hamburg Observatory in Bergedorf will be home to a special combination of culture and astrophysics, offering visitors a unique mix of concerts, discoveries and a festival atmosphere. The buildings and the outdoor area are used in a variety of ways to present musical and academic events.