The Prague Orloj, also known as the Astronomical Clock, is a medieval clock located in the Old Town Hall of Prague, the capital of the Czech Republic. It was installed in 1410, making it the third oldest astronomical clock in the world. The clock features intricate designs that display the position of the sun and moon, along with various astronomical details. Every hour, the Prague Orloj performs a show where figures of the Twelve Apostles appear, accompanied by a series of mechanical movements. This clock not only serves as a timekeeper but also as a popular tourist attraction, drawing visitors to admire its historical significance and craftsmanship.