* Astronomy

The Prague Astronomical Clock or Prague Orloj is a medieval astronomical clock located in Prague, the capital of the Czech Republic, at 50°5'13.23"N 14°25'15.30"E. The clock was first installed in 1410, making it the third-oldest astronomical clock in the world and the oldest one still working.
On October 9, 2010, the Clock's 600th anniversary was celebrated with a light show on the face of the clock tower.
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