The Prague Astronomical Clock, also known as the Prague Orloj, is one of the oldest and most famous astronomical clocks in the world. It is located on the southern wall of the Old Town Hall in the heart of Prague’s Old Town Square. Built in 1410, it is an extraordinary piece of medieval engineering, combining art, astronomy, and mechanics.

Key Features of the Prague Astronomical Clock:

1. Historical Significance: The clock was first installed in 1410 by clockmaker Mikuláš of Kadaň and mathematician Jan Šindel. Over the centuries, it has undergone several restorations but remains one of the few medieval astronomical clocks still in operation.
2. Astronomical Dial: The clock’s primary function is to show the position of the sun, moon, and other astronomical details. The astronomical dial features a representation of the Earth at the center, with concentric rings that display: • The positions of the sun and moon relative to the zodiac. • Day and night cycles. • Central European, Babylonian, and Old Bohemian time. This dial offers a visual representation of the medieval understanding of the universe.
3. The “Walk of the Apostles”: Every hour, on the hour, the clock puts on a famous show where the figures of the Twelve Apostles appear in the two windows above the astronomical dial. Other moving figures include: • The Skeleton (Death): Holding an hourglass, it rings a bell to remind onlookers of the passage of time and the inevitability of death. • Vanity: A figure holding a mirror, symbolizing the human preoccupation with appearance. • Greed: A miser holding a bag of gold, representing materialism. • Lust: A figure representing indulgence.
4. Calendar Dial: Below the astronomical dial is a large calendar wheel, added in 1490, which displays the months of the year with zodiac signs and medallions representing the different activities of each month. It also shows the feast days of saints.
5. Gothic Architecture: The clock is an architectural masterpiece, with intricate Gothic detailing and vibrant decorations, including golden accents and colorful paintings.
6. Legend and Superstition: There are many legends surrounding the clock. One famous story claims that the original clockmaker was blinded after completing the clock to prevent him from replicating his work elsewhere. Another legend suggests that the city will face disaster if the clock ever stops working.

Restoration and Preservation:

The Prague Astronomical Clock has undergone various repairs and restorations over the centuries, including significant damage during World War II. It was fully restored to its former glory in 2018, ensuring its continued operation for future generations.

Visitor Experience:

Thousands of tourists gather at Old Town Square every day to witness the hourly procession of the Apostles, making it one of Prague’s most visited attractions. The clock is a symbol of the city’s rich history, blending art, science, and medieval craftsmanship.

The Prague Astronomical Clock remains a testament to the ingenuity and creativity of its makers, and it continues to inspire awe with its intricate design and complex functions.