The Prague astronomical clock, or Prague is a medieval astronomical clock located in Prague, the capital of the Czech
Republic. The clock was first installed in 1410, making it the oldest
astronomical clock in the world and the oldest one still working.
The Orloj is mounted on the southern wall of Old Town City
Hall in the Old Town Square. 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.
