Prague astronomical clock

The Prague Astronomical Clock ( or Prague Orloj) is a medieval astronomical clock located in Prague. The clock was first installed in 1410, making it the third-oldest astronomical clock in the world and the oldest clock still operating. The Orloj is mounted on the southern wall of Old Town Hall in the Old Town Square. The clock mechanism itself has three main components: the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; statues of various Catholic saints stand on either side of the clock; “The Walk of the Apostles