Astronomical clock of Chartres

The clock's dial measures 105 centimeters and features a central astrolabe design with two supporting statues displaying zodiac constellations and lunar phases.

Records mention an astronomical clock in Chartres Cathedral from 1407, but the current mechanism was installed in 1528 and underwent restoration in 2009.

The clock incorporates medieval astronomical knowledge through its astrolabe design, demonstrating the connection between timekeeping and celestial observations in religious settings.

The external ring shows the time with a single hand, while the internal disc displays lunar phases through an opening that completes one rotation per lunar month.

The black circle represents the ecliptic path, along which a sun pointer slides throughout the year, indicating seasonal variations in daylight duration.

Location: Chartres

Inception: 1528

Made from material: limestone, copper, wrought iron

Part of: Chartres Notre-Dame cathedral, choir screen

GPS coordinates: 48.44770,1.48774

Latest update: June 23, 2025 09:48