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The Cathedral of Our Lady of Reims: This astronomical clock dates back to the 15th century, but it was only installed in the cathedral of Reims in the 17th century. It was originally built for the Carthusian monastery of Mont-Dieu, and was purchased by the archbishop of Reims in 1645 to be placed in the cathedral. The clock has been restored and repaired several times throughout the centuries—the current mechanism dates from the end of the 19th century—but the original mechanism is still conserved.

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