The Strasbourg Cathedral Astronomical Clock 1xPiP

After the mechanism had been out of action for 50 years, Jean-Baptiste Schwilgué was commissioned to renovate it in 1836. Work began in 1838 and lasted until 1842, when a completely new movement was constructed, whose functions were unique in the world. The renovated and renewed clock displays the Earth's orbit, the moon's orbit and the orbits of the planets Mercury to Saturn. A unique gear train, calculates the base date for the moving holidays during the night of Sivester.
The record for the slowest rotating gears is held by the gear train, which simulates the precession of the earth's axis, one rotation takes place in 25,800 years.