The Prague astronomical clock, a.k.a. the Prague orloj, dates all the way back to the Middle Ages. The clock has been a fixture of the Old Town Hall for over 600 years. According to legend, it was built by Master Hanuš, who was then blinded because the aldermen did not want such a fantastic machine being built for anyone else. The clock tells Central European time, sidereal time and only Hanuš knows what else. The instrument rigs, dings, and puts on a show where mechanical statues of the Twelve Apostles take centre stage.