On the monthly 'Astropolis at night' viewing evening, every 4th Friday of the month from 7:00 PM to 11:30 PM, the focus is on practical astronomy. You can visit the large observation dome to peer through our giant telescope, and on occasion, we also set up several mobile telescopes and binoculars outside. We always start around 7:30 PM with the 'Constellation of the Month' lecture in the Lemaitre auditorium. This way, we teach visitors a prominent constellation. We discuss its mythological origin and explain what you can discover in it with binoculars or a simple beginner's telescope. In short, regardless of the weather, you always learn something! Just feel like coming by and talking about astronomy and space travel in our atmospheric Astro-café? Then this is of course also possible!