Orloj, is mounted on the southern wall of the Old Town Hall in the town square in Prague in the Czech Republic. The clock was first installed in 1410, making it the third oldest astronomical clock in the world and the oldest one still operating.
The clock mechanism itself is composed of three main components: the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; “The Walk of the Apostles”, a clockwork hourly show of figures of the Apostles and other moving sculptures—notably a figure of Death (represented by a skeleton) striking the time; and a calendar dial with medallions representing the months.
According to local legend, the city will suffer if the clock is neglected and its good operation is placed in jeopardy and a ghost, mounted on the clock, was supposed to nod his head in confirmation. Based on the legend, the only hope was represented by a boy born in the New Year’s night.