The Astronomical Clock of Besançon Cathedral (Besançon, Franche-Comté, France)

Besançon Cathedral, located in the center of France’s 19th-century clock-making capital, is home to a 19-foot-tall (5.8 m) clock with 30,000 pieces. It is one of the most complicated horological devices ever made. Installed in 1860, the clock shows the local time in 17 places around the world, as well as the time and height of the tides in eight French ports, a perpetual calendar with leap-year cycles, and the times of sunrise and sunset.

The many dials of what may be the most complicated horological device ever constructed.

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