The Silesian Planetarium also Silesian Planetarium and Astronomical Observatory (Polish: Planetarium Śląskie Polish: Śląskie Planetarium i Obserwatorium Astronomiczne) is the largest and oldest planetarium in Poland. It was founded on 4 December 1955 to commemorate the great astronomer Nicolaus Copernicus. It is located in the Silesian Central Park, on the boundary between the Katowice and Chorzów districts of the Upper Silesian Metropolitan Union.