• No booking needed for the Saturday show, but come 15 minutes early to buy tickets at the door
• About an hour long, a guided talk the length of a school lesson, so it suits kids who can sit and listen
• Inside Kalemegdan fortress, in the Lower Town, so it pairs easily with an evening walk in the park

The planetarium is a star theater under an 8-meter dome, run by the Ruđer Bošković Astronomical Society, the oldest astronomy society in the Balkans. A guide projects the night sky and talks through constellations, the Moon, planets, stars and galaxies, then shows how the sky shifts through the day and the year and from different places on Earth. It suits kids who can sit through a lesson-length talk.