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Ten Days That Vanished: The Switch to the Gregorian Calendar
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Ornate astronomical clock at Cathedrale St. Jean in Lyon, France, featuring Roman numerals, zodiac symbols, and a golden sun face at the center with decorative gold detailing.
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Ten Days That Vanished: The Switch to the Gregorian Calendar: Media

In 1582 Pope Gregory XIII introduced a more accurate calendar. But switching over wasn’t easy.
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astronomical clock
Astronomical clock from the 14th century that can be used to determine religious...
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