Prague Astronomical Clock

Timeline

1. 1441–1445South wall of Prague Old Town Hall · PragueAfter completion on 9 October 1410, the clock's mechanism and astronomical dial continued to run; in 1441 Šindel became dean of Vyšehrad, and his astronomical tables and calculations still served as the basis for the clock's operation; the dial showed time purely from astronomical data, without the later added mechanical figures.
2. 1446–1450Prague · CzechiaBetween 1445 and 1447 Šindel corresponded with the future Pope Pius II (then Enea Silvio); as a benchmark of Central European timekeeping and astronomical display, the clock's original gear mechanism was still in good working order in the mid-15th century, rare among European clocks of its kind.