What Does the Astronomical Clock in Prague Do?

By Michael Ferguson

The Astronomical Clock in Prague, also known as the Prague Orloj, is a stunning piece of engineering that has been ticking since the 15th century. Located in the heart of Prague’s Old Town Square, this clock is not just any clock. It’s an astronomical clock that displays not only the time but also various astronomical details.

History

The clock is believed to have been built in 1410 by Mikulas of Kadan and Jan Sindel, who worked on the mechanical aspects of the clock while Josef Mainer was responsible for its artistic design. Over time, the clock has undergone several renovations and restorations to maintain its functionality.

Design

The clock has two main dials – one that displays the current time and another that shows a rotating calendar with zodiac signs and saints’ days. Additionally, there are four figures on either side of the clock – representing vanity, greed, death, and pleasure – which move every hour.

The Walk of the Apostles

One of the most famous features of the Astronomical Clock is The Walk of the Apostles. This display takes place every hour when figures representing the twelve apostles appear from two small windows above the main dial. The apostles move around while a skeleton representing death rings a bell.

Astronomical Details

Apart from displaying time and dates, The Astronomical Clock also includes some astronomical details like phases of the moon and positions of celestial bodies. The outer ring shows Roman numerals indicating Old Czech Time or Central European Time while Arabic numerals represent standard time.

  • Phases of Moon: The position of Moon on ecliptic circle.
  • Sun Position: The position of Sun on ecliptic circle.
  • Star Calendar: The position of 365 stars in the sky, which was believed to determine the weather.

Conclusion

The Astronomical Clock in Prague is a masterpiece that reflects the scientific and artistic achievements of its time. With its intricate design and astronomical details, it continues to attract visitors from all over the world. If you get a chance to visit Prague, make sure to witness The Walk of the Apostles and explore other features of this magnificent clock.