The Prague astronomical clock or Prague Orloj is a medieval astronomical clock attached to the Old Town Hall in Prague, the capital of the Czech Republic. The clock was first installed in 1410, making it the third-oldest astronomical clock in the world and the oldest clock still in operation.

The Orloj is mounted on the southern wall of Old Town Hall in the Old Town Square. The clock is a marvel of engineering and craftsmanship, and it is one of the most popular tourist attractions in Prague. It consists of three main parts: an astronomical dial, a calendar dial, and a moving automaton show. The astronomical dial represents the position of the Sun and Moon in the sky and displays various astronomical details. The second is a calendar dial with medallions representing the months.

The last component is statues of various Catholic saints standing on either side of the clock. “The Walk of the Apostles”, an hourly show of moving Apostle figures and other sculptures, notably a figure of a skeleton that represents Death, striking the time.

In addition to telling the time and displaying astronomical information, the Prague astronomical clock is also a work of art. The clock face is decorated with intricate carvings and sculptures, and the moving automaton show is a fascinating spectacle.

According to the Internet