The astronomical clock of the cathedral of Saint-Jean, located in the center of the old French watchmaking capital of Besançon, is one of the most complicated horological devices in the world. Installed in 1860, the clock features 30,000 pieces, 70 dials, 122 indicators, the local time in 17 places around the world, the time and height of the tides in eight French ports, a perpetual calendar with leap year cycles, times of sunrise and sunset, an orrery, and 21 automata.

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