Cities
Czech Republic Prague Staré Město Observatory

Clementinum Astronomical Tower

About

The Clementinum Astronomical Tower, rising 68 meters above Prague’s Old Town, is a striking symbol of the city’s scientific legacy. Completed in 1722 as part of the former Jesuit college, the tower once served as a key site for astronomical and meteorological observations. Its Meridian Room was used to determine noon with such precision that it set the official time for Prague. Today, visitors can climb 172 steps to a viewing gallery offering panoramic views of the city, while exploring historical instruments and learning about figures like Joseph Stepling, who advanced astronomy in the 18th century. The tower remains a vital link between Prague’s intellectual past and its cultural present.

Prague Czech Republic
Clementinum Astronomical Tower
Location

The Clementinum Astronomical Tower is located within the Clementinum complex at Mariánské náměstí 190/5 in the Old Town of Prague, Czech Republic. The tower rises 68 meters tall and offers visitors a stunning 360° panoramic view of Prague’s historic city center and Prague Castle. It is part of the former Jesuit college, which is the second largest architectural complex in Prague, housing the Czech National Library and featuring the famous Baroque Library Hall and Meridian Hall. The tower has a rich scientific history, having been used for astronomical and meteorological observations since the mid-18th century. Nearby, visitors can explore the Baroque Library with over 27,000 theological volumes and beautiful frescoes, as well as the Meridian Hall, which contains original astronomical instruments used to determine noon. The Clementinum's location places it close to key city landmarks such as the Charles Bridge and the Old Town Square, making it a central cultural and historical highlight accessible by tram or metro via the Staroměstská station. The area is richly steeped in history and architecture, perfect for visitors combining astronomy, culture, and panoramic city sightseeing in Prague.

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