<P> The Prague astronomical clock, or Prague orloj (Czech: Pražský orloj (praʃskiː orloj)), is a medieval astronomical clock located in Prague, the capital of the Czech Republic . It is currently undergoing a reconstruction and should be back in place by the end of October 2018 . </P> <P> 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", 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; a ghost, mounted on the clock, was supposed to nod its head in confirmation . According to the legend, the only hope was represented by a boy born on New Year's night . </P>

Where is the oldest astronomical clock in the world that is still working