Astronomical Clock

Overview

The Prague Astronomical Clock (Orloj) is the world's oldest still-operating astronomical clock, mounted on the Old Town Hall since 1410. Every hour, Death rings a bell and the 12 apostles process through windows above the clock face.

Highlights

• Hourly show: The apostles' procession and crowing rooster run on the hour from 09:00 to 23:00.
• Three components: The astronomical dial (tracks sun and moon), the calendar dial (months and zodiac), and the apostles.
• Calendar plate: Josef Mánes's 1866 painted medallions depict Czech agricultural months.

History

Created by clock-maker Mikuláš of Kadaň and astronomer Jan Šindel in 1410. Legend says the city blinded the maker to prevent him building another.

Visitor Tips

• Don't over-expect: The apostle show lasts about 45 seconds. Appreciate the clock mechanism itself.
• Tower climb: The adjacent Old Town Hall tower offers the best aerial view of the square.
• Duration: 5–10 minutes.