Planetárium Praha, Astronomical education center in Bubeneč, Prague, Czech Republic

Planetárium Praha is an astronomy center in Bubeneč, Prague, housed in a dome-shaped building designed specifically for sky projection shows. The main hall features a large curved ceiling where stars, planets, and other space objects are projected all around the seated audience.

The planetarium's origins trace to the 1954 Leipzig Trade Fair, where Prague mayor Václav Vacek signed a contract with Carl Zeiss Jena for two projectors worth 10 million Kčs, one for Prague and one for Bratislava. Construction began in 1958 to a design by architect Jaroslav Fragner, and the building opened on 20 November 1960. Astronomer and cartographer Antonín Rükl directed it from 1960 to 1999.

The planetarium is run by Planetum, the city organization that also manages the Štefánik Observatory on Petřín and the Ďáblice Observatory. Its building by architect Jaroslav Fragner stands in the Královská obora (Stromovka) in Prague 7, next to Výstaviště. The name Planetum covers all three sites under one brand.

Seats in the center of the hall give the widest view of the projection, since the dome covers more of your field of vision from there. Shows take place in complete darkness and require looking upward the entire time, so comfortable clothing makes a noticeable difference.

The Cosmorama optomechanical projector, installed in 1991, is the last working device of its type; it sits on moving arms so it can be hidden during digital projection. The 2023–2025 renovation replaced the 23.5 m projection surface with a 22 m LED dome of over 45 million micro-LEDs, the first of its kind in Europe.