The Orloj or Prague Astronomical Clock, made by Hanus and installed in 1410 on the southern wall of the Old Town Hall on Old Town Square, Prague, Czech Republic. The clock mechanism has 3 main components: the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; "The Walk of the Apostles", a clockwork hourly show of figures of the Apostles and other moving sculptures striking the time; and a calendar dial with medallions representing the months. It is the third-oldest astronomical clock in the world and the oldest one still working. The historic centre of Prague was declared a UNESCO World Heritage Site in 1992. Picture by Manuel Cohen
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