What Time Does the Prague Astronomical Clock Activate? Complete Guide (2026)

There is a legend about the Prague Astronomical Clock that local guides have been telling for centuries: the City Council, fearing that the master clockmaker Hanuš would build an equally extraordinary clock elsewhere, had him blinded once the work was finished. The clockmaker, in retaliation, reached his hand into the mechanism and stopped it. The clock took decades to work again.

The legend is almost certainly false; historical documents do not corroborate it. But it says something true about the Orloj: from the day it was installed in 1410, it has generated wonder, stories and the human need to explain how something so complex can exist.

The Prague Astronomical Clock is the oldest astronomical clock in the world still in active operation. It is 615 years old. It still marks the time, the zodiac, the position of the sun and the phases of the moon. And on the hour, it sets in motion a spectacle that draws hundreds of people to the Old Town Square every time it happens.

History: from 1410 to today

The Orloj was installed on the Old Town Hall Tower on 9 October 1410, according to the most widely accepted historical documents. The clockmaker was Mikuláš de Kadaň, with the possible collaboration of the astronomer Jan Šindel.

In 1490, the master clockmaker Jan Růže carried out a significant overhaul and expansion of the mechanism, adding the calendar we see today on the lower disc.

Over the centuries, the clock suffered stoppages, wars and restorations. The most dramatic: on 8 May 1945, during the final days of the Second World War, retreating German troops set fire to the Town Hall building. The Astronomical Clock was severely damaged. The reconstruction took three years; the clock resumed operation on 1 June 1948.

The last major restoration was in 2018, two years of work during which the clock was covered by a cloth decorated with its own image, whilst Czech artisans rebuilt the mechanism piece by piece.

How to read the clock: the four layers

The Orloj is not a single-function clock. It is four instruments in one, layered within the same mechanism:

1. The Astronomical Clock (the main dial)

The main dial is divided into three concentric zones. The black background represents the night sky and the universe. The concentric rings show:

• Prague solar time, the real local time, based on the position of the sun
• Central European time, the conventional time (in Arabic numerals on the outer rim)
• Babylonian time, an ancient way of counting hours from sunrise
• Italian / sidereal time, the time since sunset

The sun, represented by the golden hand with the solar disc, moves along the ecliptic tracing the zodiacal positions throughout the year.

The moon, with its real phase updated each day, moves on the inner orbit.

2. The zodiac ring

The outer circle of the main dial shows the twelve signs of the zodiac in their correct astronomical position relative to the sun. It is not decoration; it is an astronomical measuring instrument.

3. The calendar (lower disc)

The lower disc, added in 1490, is a perpetual calendar with the 365 days of the year, represented in twelve segments with the feast days and saints of each day. The medieval miniatures surrounding it depict the agricultural activities of each month.

4. The moving figures

On the sides of the main dial there are four figures representing the vices most feared by medieval society: Vanity (with the mirror), Greed (with the money bag), Death (the skeleton with the hourglass) and the Turk / Worldly Pleasure (representing the vice of the flesh).

On the hour, Death pulls the bell rope, starting the show.

The hourly show

Every hour on the hour, from 9:00 to 21:00, the Orloj activates its procession of figures:

1. Death pulls the rope, the first chime sounds
2. The upper windows open and the twelve apostles slowly file past them, six through each window, rotating
3. The four side figures move and gesticulate
4. A golden cockerel appears at the top, crows and spreads its wings to close the performance
5. The chimes complete the hour

The show lasts less than a minute. Most travellers who see it for the first time are surprised by two things: how brief it is, and what they feel watching it. There is something about the golden cockerel crowing at the sun, having done so for 600 years, every hour, interrupted only by wars, that produces an effect difficult to explain rationally.

What ODISEA groups always ask afterwards: what do the deadly sins mean in relation to heaven? The answer: the four side figures represent the vices that prevent man from reaching heaven; that is why they are below, looking upwards, unable to reach where the apostles go. It is medieval theology turned into clockwork mechanics.

How to visit: practical tips

The show is free. There is no need to buy a ticket to see the procession of apostles; you simply need to be in the Old Town Square on the hour.

The best time: the show itself is always the same. But the Old Town Square has fewer people before 10:00. If you want to see the clock without crowds, arrive before the first hour on the hour you plan to attend.

Going up the tower: there is a lift and stairs leading up to the Town Hall tower with panoramic views over the square and the historic quarter. There is an admission charge (check the current price on the Town Hall website). It is not essential for understanding the clock, but the views justify the climb.

The ODISEA free tour: the Free Tour Old Town & Jewish Quarter passes by the Astronomical Clock with a full explanation of the mechanism, the symbols, the show and the legend of the blinded clockmaker. It is the most efficient way to understand the Orloj without having to decipher the information panels on your own. From here, the tour continues towards the Charles Bridge and connects with the route to Prague Castle.

Frequently asked questions about the Astronomical Clock

When was the Prague Astronomical Clock built? The original mechanism was installed on 9 October 1410. In 1490, the clockmaker Jan Růže expanded the ensemble by adding the lower calendar. It is the oldest astronomical clock in the world in continuous operation.

How many times a day does the show run? Every hour on the hour, from 9:00 to 21:00. That is 13 shows daily, each lasting less than a minute.

What does the golden cockerel mean? The golden cockerel crowns the show, crowing and spreading its wings at the end of the apostles' procession. The cockerel is a symbol of dawn, vigilance and the passage of time. In the medieval Christian tradition, the cock's crow also marks the end of night and the start of day, separating the time of sleep from the time of work.

Is it free to watch the Astronomical Clock show? Yes. The hourly show is completely free; you simply need to be in the Old Town Square. Going up the Town Hall tower to see the mechanism from inside and the panoramic views has a paid admission.

What is the best position to watch the show? From the square, facing the tower directly. The more centred you are in relation to the clock, the better. During peak summer hours, the square can be completely full; arrive 10 minutes early to secure a spot.

How much time should you dedicate to the Astronomical Clock? To watch the show and examine the mechanism from the square: 20-30 minutes. To go up the tower as well: add 45 additional minutes. The free tour includes the stop with full context in approximately 15 minutes.

The Astronomical Clock is a two-minute walk from the Prague Jewish Quarter and ten minutes from the Charles Bridge. The three form the core of the first day itinerary in Prague.