So close to the stars

So close to the stars So close to the stars © Martin Mařák 2
The Old Town Astronomical Clock The Old Town Astronomical Clock archiv Czech Tourism 3
Old Town Astronomical Clock Old Town Astronomical Clock © Thinkstock 4
Old Town Astronomical Clock Old Town Astronomical Clock © Thinkstock 5

According to one legend, Prague’s magnificent destiny was prophesied even before its founding: “I see a great city whose glory will touch the stars.”

Download guides and brochure

These words utter by the mythical Princess Libuše supposedly determined the place in the deep forests around the river Vltava where the first inhabitants were to build a castle and thus the foundation for a new town.

An inexplicable connection between the city and the stars, astronomy and astrological magic is characteristic of Prague to this day. Perhaps it is even thanks to some lucky star that Prague has managed to escape all major wars and disasters, allowing it to retain its unique character, in which architectural styles from an entire millennium blend into one picturesque whole whose parallel you will not find anywhere else in the world.


Prague’s mysterious atmosphere has again and again captivated its visitors, among them the most prominent personalities of science, art and politics, who stopped at this crossroads in the middle of Europe or even tied their fate to the city for a longer time. But gives Prague its grace and beauty? What is her secret? From whence comes the “inexplicable supernatural" that the Czech writer Jakub Arbes notices in Prague? We never seem to find a simple answer, because something is hidden beneath the surface in Prague which is eludes our daily experience and defies our understanding. Whoever wants to get to know Prague must know something about her – something which cannot be read in even the best-researched guidebooks. That means only one thing – it is necessary to see her, to walk through her streets, and to see with your own eyes the city of eccentrics and visionaries, the restless heart of Central Europe, as it once was described by the German writer Oskar Wiener. Not even the best poem or novel can capture even a fraction of her mystery and beauty.

King of charlatans and scientists

Prague experienced perhaps its greatest period of prosperity during the reign of Rudolf II (†1621). One of Czech history’s most noble eccentrics, he turned Prague into the capital of his empire and amassed treasures of enormous value here. The castle treasury was full of gadgets and curiosities, but it also boasted the one of the most magnificent art collections of the period. Only a fraction of that valuable but ill-fated collection can be admired at the Prague Castle Picture Gallery today. There you will find works by Veronese, Dürer and Hans von Aachen and others.

Prague Castle Picture Gallery

Portrait of Rudolf II by Hans von Aachen  Alchemists in the court of Rudolf II

Photos: Portrait of Rudolf II by Hans von Aachen, Alchemists in the court of Rudolf II


During the reign of Rudolf II, Prague lived in the eccentric spirit of its sovereign. The atmosphere was favourably inclined to astrologists, metaphysicians and all manner of charlatans. The emperor’s enchantment with the stars attracted to Prague top astronomers and alchemists in equal measure. According to legend, the picturesque Golden Lane at Prague Castle was inhabited by men of the secret craft, and the lane has been preserved almost unchanged to this day.

Golden Lane

In Prague lived also Giordano Bruno. He was later burnt at the stake for his belief that neither the Earth nor the Sun was the centre of the universe and that the universe was infinite. he wrote two treatises during his unsuccessful wait for acceptance into the service of Emperor Rudolf II: One of them he dedicated to the emperor, perhaps in farewell. It was titled One Hundred and Sixty Articles Against Contemporary Mathematicians and Philosophers.

Thanks to Emperor Rudolf II, Prague became a meeting point for two of the most important figures in the history of astronomy. Their relationship and the long period in which the cause of Tycho Brahe’s death remained a mystery has sparked the imagination of historians and writers around the world. In Prague, you will find traces of both of these great astronomers at every step.

In the footsteps of famous astronomers
In the footsteps of famous astronomers

unique sights in Prague

Belvedere Thinkstock


Queen Anne Summer Palace, called the Belvedere. The most stylistically pure Renaissance building north of the Alps. According to tradition, Brahe and Kepler did their astronomical observations here.

Wallenstein Palace Thinkstock

Wallenstein Palace

In the Wallenstein Palace, today the seat of the Czech Senate, you will find an astronomical corridor whose decoration depicts Galileo’s discoveries , such as Saturn with two moons instead of rings and the phases of Venus. The decoration reportedly originated at the suggestion of Johannes Kepler after his last visit to Prague in 1628. Construction of the Wallenstein Palace was led by Giovanni Pieroni, once a pupil of Galileo Galilei.

Strahov Monastery © Roman Cestr

Strahov Monastery

Strahov Monastery with its famous library containing more than 200,000 rare volumes. Here we can find a collection of books belonging to Antonín Strnad (1746–1799), the saviour of the Old Town Astronomical Clock, with many mathematical treatises. Among the books are also valuable volumes from the library of Tycho Brahe as well as his own works. In the Theological Hall it is possible to see a number of unique terrestrial and astronomical globes. The Philosophical and Theological halls are richly decorated with frescoes with astronomical motifs.

Ball Game Hall archiv Photo-Prague (COEX)

Ball Game Hall

The Mathematical Tower at Prague Castle was built in the 17th century. Stones from the original structure from the 12th century can be seen in the passage between the second and third courtyards. Emperor Rudolf II spent a lot of time in the tower. He installed astronomical instruments there, and Johannes Kepler would come here to visit him. On the walls of the nearby Ball Game Hall in the Royal Garden are frescoes with allegories of astronomy, geometry, arithmetic, etc.

Schwarzenberg Palace archiv Photo-Prague (COEX)

Schwarzenberg Palace

Schwarzenberg Palace on Hradčany Square (Hradčanské náměstí). Here on the second floor of the palace, Tycho Brahe reportedly attended his legendary last supper. Today the palace is used by the National Gallery.

Ovocný trh © Eliška A. Kubičková

Ovocný trh

Johannes Kepler lived in the former residence hall of Charles University at Ovocný trh (Fruit Market) No. 12/573 in the years 1604–1607. Here, he discovered that Mars had an elliptical orbit. From the wooden tower in the garden he observed a supernova in the constellation Ophiuchus in 1604.

Clementinum © Thinkstock


This is where the oldest and still functioning weather station in Central Europe originated. Regular meteorological measurements have been carried out here since 1775. In the publicly accessible astronomical tower you will find a renovated historical quadrant and other astronomical instruments. You can also visit the Baroque hall above the Mirror Chapel and see the ceiling fresco from 1727, part of which is an allegory of the sciences. The ceiling fresco in the old Mathematical Hall (now the music department) is an interesting example of how in the 18th century it was possible to show the Copernican cosmological model in a Jesuit college, even though it was not accepted by the Catholic Church at that time. Albert Einstein also lectured at the Clementinum during his stay in Prague.

Kepler’s house archiv Photo-Prague (COEX)

Kepler’s house

Kepler’s house (No. 5) on Karlova street. Johannes Kepler lived here from 1607 to 1612 and finished his work Astronomia Nova here. Today it is probably the smallest museum in Prague, housing an exposition about Johannes Kepler. This is the only surviving residence of Kepler anywhere in the world. During his stay in this house, he also described the hexagonal shape of snowflakes, worked on the study of optics, and constructed the refracting telescope.

x 1 /

The astronomer’s apprentice and the mysterious death of the teacher

Tycho Brahe is considered to have been the best and the most accurate observer of the night sky, whose discoveries were surpassed only sixty years after the invention of the telescope. He settled in the court of Rudolf II after leaving Denmark following a disagreement with King Christian IV. Although he was a scientist, he worked in the emperor’s service as an astrologer, and a story is told that he even predicted that the emperor’s fate would be closely tied to the life of his favourite lion. According to legend, Rudolf actually died a few days after the animal’s death.

Legends have also long been told about the death of Tycho Brahe himself. Reportedly he died from a rupture of the bladder while observing a solar eclipse; another legend says the cause of the rupture was an excessive timidness that prevented him rising from the feast table before the emperor. Newer hypotheses worked with the assumption that he poisoned himself, or even that he was murdered by someone. According to one version, his murderer was a Swedish nobleman acting on the instructions of King Christian IV, and according to another one it was his assistant Johannes Kepler, eager to get at the astronomical notes which Brahe had over amassed over his 40-year career. In this cruel way, the young Kepler would have been able to further his own brilliant career.

The 400-year-old mystery reached its denouement only recently. In January 2009, Denmark requested a new exhumation of Tycho Brahe’s body, which is buried in Týn Church on Old Town Square. The next year, a Danish team of scientists arrived in Prague to study the remains and to determine whether the death could have been caused by mercuric chloride poisoning. Archaeologists exhumed Brahe’s remains in a tin coffin on November 15th. Inside they found parts of long bones, ribs and part of the skull, which were transported to the Na Homolce Hospital in Prague for further study using computer tomography. Two years later, a report was issued that Brahe died in Prague of natural causes, not poisoning.


Exhumed remains of Tycho Brahe   Exhumed remains of Tycho Brahe

Photos: Exhumed remains of Tycho Brahe (© ČTK)


After more than four centuries, Johannes Kepler was exonerated of false suspicions. This eminent scientist began as an assistant to Tycho Brahe in Prague and he helped in accurately calculating the planetary orbit of Mars. After Brahe’s death, Kepler took his place as the imperial mathematician and astrologer and continued his own work. It was in Prague that Kepler discovered and also first published, in the book Astronomia Nova, the first two of his three laws of planetary motion around the Sun, which refined the foundations of astronomy. The validity of his ideas was experimentally confirmed by science until half a century ago, and even many years later they helped rocket designers to launch the first artificial satellites and space probes.


The Old Town Astronomical Clock, also known as the Orloj, is probably the best preserved medieval astronomical clock in the world. It was installed on the tower of the Old Town Hall in 1410. Its creator was Jan Ondřejův, called Šindel, and the clockwork itself was made by Mikuláš of Kadaň. The medieval heart of the clock, the gears with 365, 366 and 379 teeth which ensure the movement of the hands for the Sun, Moon and zodiac, have been preserved and are still functional. At the end of the 15th century a calendar was added, and it was replaced in 1866 with a new one painted by the artist Josef Mánes. Jan Ondřejův (c. 1375–1454) was an outstanding medieval astronomer, mathematician and physician, and his work was praised by Tycho Brahe.



© Thinkstock                                                  © Thinkstock


The Orloj is actually an astrolabe – a sort of universal analogue computer based on a mechanical principle, which shows the apparent position of celestial bodies in the sky. On the Orloj it is possible to read which zodiacal sign the Sun is currently in, and you can also find out the Sun’s distance above the horizon, the time of its rise and set, the days of solstices and equinoxes, and more. The hand with a small golden star shows astral time. The sophisticated technical apparatus was complemented in the 18th century with moving figures of the twelve Apostles, which parade by in the upper part of the clock at the top of the hour.

According to legend, the functioning of the clock is also linked with the fate of the Czech lands. As long as the machine is working, everything is more or less fine, but should it stop, things may go badly. The last such event occurred in 2001, shortly before midnight on New Year’s Eve, when a small problem caused the clock (now running on an electric mechanism) to stop running – and in August 2002 Prague was hit with a disastrous flood.




Oct 12, 2017Oct 15, 2017


Prague after Dark Will Come Alive with Light for Four Days in October!
Prague after Dark Will Come Alive with Light for Four Days in October!
May 12, 2017Jun 2, 2017


A multi-genre festival famed throughout the world, the biggest music show in the Czech Republic.
A multi-genre festival famed throughout the world, the biggest music show in the Czech Republic.
May 22, 2017Jun 22, 2017


Dance is the hidden language of the soul – enjoy the performances of domestic and foreign dance artists!
Dance is the hidden language of the soul – enjoy the performances of domestic and foreign dance artists!


TV tower in Prague

In 1992, the tallest structure in Prague, the 216 meter high television tower, was built in Mahler Gardens on the bor...

Hotel Boscolo, Prague

The luxury, five-star Hotel Boscolo Prague is located on Senovážné náměstí  in the centre of Prague. The ho...

Art Deco Imperial Hotel, Prague

Experience the atmosphere of the beginning of the 20th century in the five-star Hotel Imperial and the famous Grand C...

The Mark Luxury Hotel Prague

Following renovation, this 17th-century Baroque palace in Hybernská street was transformed into the luxurious, f...