<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> <P> The oldest part of the Orloj, the mechanical clock and astronomical dial, dates back to 1410 when it was made by clockmaker Mikuláš of Kadaň and Jan Šindel, then later a professor of mathematics and astronomy at Charles University . The first recorded mention of the clock was on 9 October 1410 . Later, presumably around 1490, the calendar dial was added and the clock facade was decorated with gothic sculptures . </P> <P> Formerly, it was believed that the Orloj was constructed in 1490 by clockmaster Jan Růže (also called Hanuš); this is now known to be a historical mistake . A legend, recounted by Alois Jirásek, has it that the clockmaker Hanuš was blinded on the order of the Prague Councillors so that he could not repeat his work; in turn, he disabled the clock, and no one was able to repair it for the next hundred years . </P>

When was the astronomical clock in prague built