The Zeiss-Planetarium in Jena, Germany is the oldest continuously operating planetarium in the world. It was opened on July 18, 1926. The Zeiss-Planetarium is a projection planetarium. The planets and fixed stars are projected onto the inner surface of a white cupola.
The Zeiss-Planetarium is owned and operated by the Ernst-Abbe-Stiftung.
It was engineered by German engineer Walther Bauersfeld.