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Prague Astronomical Clock - Astrolabe
The Prague Astronomical Clock, or Prague Orloj, is a medieval astronomical clock installed in 1410 on the Old Town City Hall in Prague, Czech Republic. It is the third-oldest astronomical clock in the world and the oldest still working. Its main features include an astronomical dial, the hourly Walk of the Apostles, and a calendar dial. The clock's 600th anniversary was celebrated in 2010 with a light show. The Czech Republic's 20-koruna coin features the Prague Astronomical Clock, including its astrolabe.
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