Prague Astronomical Clock — History from 1410 to Today
Six centuries of one of the world's most extraordinary mechanical clocks: Mikuláš of Kadaň, Jan Růže, the 1945 fire, the Mánes calendar, and the modern operation.
The Prague Astronomical Clock has been telling time on the south wall of the Old Town Hall since 1410, making it the third-oldest astronomical clock in the world and the only one still operating with significant parts of its original mechanism. Its six centuries include royal commissions, near-destruction in 1945, and a 2018 restoration. Here is the full history, accurately dated, with the legends marked as legends.
1410 — the original mechanism
The clock was installed in 1410. It was built by clockmaker Mikuláš of Kadaň working with mathematician and astronomer Jan Šindel of the Charles University. Their original mechanism includes the astrolabe dial (the upper dial showing the position of the sun, moon and zodiac signs), the calendar dial below (originally with a simpler design), and the basic timekeeping movement. The clock was added to the Old Town Hall's south facade, where it remains today.
The clock was a civic showpiece — Prague was an Imperial capital at the time, and the city's wealth allowed it to commission what was, at the start of the 15th century, one of the most ambitious clockworks in Europe. The astrolabe dial reflects medieval cosmology with the Earth at the centre; the rings around it show the sun's path, the moon's position and the zodiac. Many of the original 1410 components are still in service today, after multiple repairs and partial replacements over the centuries.
The Master Hanuš legend (historical note)
A persistent legend says that the clock was made by Master Hanuš of Růže (Jan Růže), and that the city councillors had him blinded to prevent him from building a similar clock elsewhere. The story is sometimes embellished further: Hanuš, in revenge, threw himself into the mechanism and stopped it for centuries. The legend is recorded in 19th-century Czech literature but has no documentary basis from the 15th century.
Modern scholarship attributes the original clock to Mikuláš of Kadaň (1410), and identifies Jan Růže (Hanuš) as the master clockmaker who improved and substantially extended the clock around 1490. The blinding story appears to be a later folk addition with no historical evidence. The two figures — Mikuláš and Hanuš — were conflated in the 19th-century National Revival period, when Czech writers were elevating medieval craftsmen as national heroes. The clock's actual history is more collaborative and less dramatic than the legend.
1490–1948 — additions and the Apostles
Jan Růže (Master Hanuš) added the 1490 improvements: the calendar dial received its first elaborate decoration, the moving figures (Vanity, Greed, Death and Lust) on either side of the clock face were added, and the timekeeping accuracy was improved. The 12 Apostle figures that process across the upper windows were added much later — 1865–66, during a major restoration by Josef Mánes. Mánes also repainted the calendar dial below the clock face, with his 1865 painting showing the 12 months as Bohemian scenes — peasants ploughing, harvesting, drinking. The original Mánes painting was moved to the Prague City Museum for conservation; a copy is in place today.
Other restorations: 1659 (Jan Taborský, who wrote a detailed manual of the clock that still survives), 1787 (early modern reconstruction), and 1864 (Josef Mánes period restoration). The clock continued to operate continuously through the 19th century and into the 20th — until May 1945, when the war reached Prague.
1945 fire and 2018 restoration
On 8 May 1945, the final day of the Prague Uprising against the German occupation, the Old Town Hall was set on fire. The clock and the north and west wings of the building were heavily damaged. The astrolabe dial and many wooden figures were destroyed; the iron mechanism survived but was warped by heat. Restoration began in 1948 under master clockmaker Petr Skála and continued for years. Most of the wooden Apostle figures were re-carved during this period; the calendar dial was repainted. The clock was running again by 1948 but with significant new components.
In 2018, the clock underwent its most thorough modern restoration. The figures were cleaned and repaired, the painted dials were re-restored, and the mechanism was overhauled. The 2018 work also corrected several inaccuracies introduced in the 1948 emergency restoration. Today's clock is a careful combination of original 1410 components, 1490 additions, 19th-century figures, 1948 post-war restoration, and 2018 conservation. The mechanism still runs every hour from 09:00 to 23:00, every day.
Frequently asked
How old is the Prague Astronomical Clock?
The clock was installed in 1410, making it 616 years old in 2026. It is the third-oldest astronomical clock in the world and the only one still operating with significant parts of its original mechanism.
Who built the Prague Astronomical Clock?
The original 1410 clock was built by Mikuláš of Kadaň with mathematician Jan Šindel of Charles University. Significant improvements were added by Jan Růže (Master Hanuš) around 1490. The 12 Apostle figures and the calendar dial painting were added by Josef Mánes in 1865–66.
Is the Master Hanuš blinding legend true?
No, the blinding story has no documentary basis from the 15th century. It is a 19th-century folk legend that was elevated during the Czech National Revival period. Master Hanuš (Jan Růže) was a real historical figure who improved the clock around 1490, but he was not blinded.
What happened to the clock in 1945?
On 8 May 1945, during the final day of the Prague Uprising against the German occupation, the Old Town Hall was set on fire. The clock was heavily damaged — the astrolabe dial and most wooden figures destroyed, the iron mechanism warped. Restoration ran from 1948 onward; most modern Apostle figures are re-carved post-war replacements.
Does the clock still use the original 1410 mechanism?
Significant parts of the original 1410 mechanism are still in operation, particularly within the iron core movement. Many components have been replaced or restored over six centuries — most thoroughly after the 1945 fire and during the 2018 restoration. It is the only astronomical clock in the world that still operates with substantial original components.
When was the last major restoration?
2018. The figures were cleaned and repaired, the painted dials re-restored, and the mechanism overhauled. The 2018 work also corrected several inaccuracies introduced in the 1948 emergency post-war restoration. The clock is now in its best working condition in a century.