The Passemant astronomical clock is an astronomical clock designed by Claude-Simeon Passemant in the eighteenth century. It is displayed in the Salon de la pendule in the petit appartement du roi on the first floor of Versailles.
The clock is an exceptional rococorwork over 2 metres (6 ft 7 in) in height, crowned with a moving celestial sphere. It shows the date, time, real time average phases of the moon and Copernican planetary motion. The large astronomical dials mark the rising and setting of the sun and moon every day. Earth is represented by a bronze globe on which all countries are engraved with the main cities. This globe is placed among the rocks and waterfalls, which serve as a universal horizon.
The mechanism is designed to be able to display the date until the end of the year 9999.
