Clockmaker Petr Skala removes the calendar dial of Prague's medieval astronomical clock during the ongoing renovation of the Old Town Hall at the Old...
{"Image ImageDescription": "Clockmaker Petr Skala (R) removes the calendar dial of Prague's medieval astronomical clock (Prazsky orloj), during the ongoing renovation of the Old Town Hall at the Old Town Square in Prague, on May 25, 2017.\nThe clock has three main components: the astronomical dial, a clockwork hourly and a calendar dial. The first recorded mention of the clock was in 1410. \nThe Prazsky orloj is the third-oldest astronomical clock in the world and the oldest still working. / AFP PHOTO / Michal Cizek        (Photo credit should read MICHAL CIZEK/AFP via Getty Images)"}