The Strasbourg astronomical clock is located in the Cathedral of the French city of Strasbourg.

The Strasbourg astronomical clock
The Strasbourg astronomical clock

The current clock dates from 1843. Its main features, besides the automata, are a perpetual calendar (including a computus), an orrery (planetary dial), a display of the real position of the Sun and the Moon, and solar and lunar eclipses. The main attraction is the procession of the Apostles which occurs every day at 12:30pm, that is at noon clock time.


The first clock

The first astronomical clock of Strasbourg cathedral was erected between 1352-1354, against the south transept. The name of its maker is not known. This clock was known as the "Three Kings clock" and had several automata. One of them was the gilded rooster, later reused in the second clock and which now is part of the collections of the Strasbourg Museum of Decorative Arts. This bird, a symbol of Christ's passion, was made of iron, copper, and wood. At noon it flapped its beak and spread out its feathers. It also opened its beak, put out its tongue, and by means of a bellows and a reed, crowed. In the top compartment at noon, to the sound of a small carillon, the Three Kings bowed before the figure of The Virgin Mary and the Christ Child.

The clock most certainly had an astrolabe dial and a calendar dial. It was standing on the wall opposite the current clock, and a staircase led to its various levels. Supports for former balconies can still be seen today, and suggest that the height of the clock was about 18 m, with a width of about 7.70 m at the base. At the base a painted figure of a zodiacal man showed the relationship between the signs of the zodiac and parts of the human body.

There is also a big circle engraved in the wall, but this circle is not a remnant of the first clock. It was added at a later stage, for some unclarified reason.

The entire structure was dismantled in 1572-4 when the second and even more ambitious clock was mounted on the opposite wall of the south transept


The second clock

The first clock stopped working and a new one was started in the 16th century. It was designed by the mathematician Christian Herlin. During a first phase, the stone case and the staircase were built, around 1547, and the dial and iron framework were being constructed when work halted, due to the various political problems - the cathedral became catholic - and also due to the deaths of Herlin and his associates.

Construction was resumed in 1571 by Conrad Dasypodius, a pupil of and successor to Herlin. Dasypodius enrolled the Swiss clockmakers Isaac and Josias Habrecht, as well as the astronomer and musician David Wolckenstein, and Swiss artists Tobias Stimmer and his brother Josias. The clock was completed in 1574.

This clock was remarkable both for its complexity as an astronomical device and for the range and richness of its decorations and accessories. As well as the many dials and indicators - the calendar dial, the astrolabe, the indicators for planets, and eclipses - the clock was also well endowed with paintings, moving statues, automata, and musical entertainment in the form of a six tune carillon. The Stimmers painted large panels that depicted the three Fates, Urania, Colossus, Copernicus, and various sacred themes, including the Creation, the resurrection of the Dead, the last judgement, and the rewards of virtue and vice.

At the base of a clock there was an 86 cm diameter celestial globe, accompanied by the figure of a pelican. The globe was connected to the clock movement, and set for the latitude of Strasbourg.

A popular feature of the new clock was the golden cockerel, a relic of the first clock, which perched on the top of the cupola and entertained the onlookers at noon every day until 1640, when it was struck by lightning.

Most of the works are still preserved in the Museum of Decorative Arts.


The third clock

The second clock stopped working around 1788 and stood still until 1838, when Jean-Baptiste Schwilgué (1776-1856) started to build the current clock. He designed new mechanisms to replace the old ones and which were meant to be state of the art. Schwilgué had wanted to work on the clock since his boyhood, but he only got the contract 50 years later. In the meantime, he had become acquainted with clockmaking, mathematics, mechanics, etc. He spent one year preparing his 30 workers before actually starting construction. Then, construction lasted from 1838 until June 24, 1843. The clock, however, was inaugurated on December 31, 1842.