The Nicolaus Copernicus Planetarium sits in the Sea Garden, close enough to combine with the Naval Museum, Aquarium, and a walk above the beach. Opened in 1968, it grew out of Varna's astronomy clubs and remains the city's public astronomy complex, with an observatory, planetarium hall, and a tower with a Foucault pendulum.
It is a modest, old-school science stop rather than a glossy interactive museum, but that is part of its charm. Families get the clearest value from the sky shows, while curious adults will appreciate the way it adds a Soviet-era scientific layer to a city otherwise dominated by beaches, Roman ruins, and seaside promenades. Check show times before going, especially outside the main holiday season.