By the 16th century, the Julian calendar had drifted about 10 days out of sync with the solar year due to a small error in its calculation of the Earth’s orbit. This gradual mismatch affected the timing of important seasonal and religious events. To address this issue, Pope Gregory XIII introduced the Gregorian calendar in 1582. As part of the reform, 10 days were removed from the calendar to restore alignment with the solar year. Consequently, Thursday, October 4, 1582, was immediately followed by Friday, October 15, 1582, and the dates from October 5 to October 14, 1582, were skipped in countries that adopted the new calendar. This correction is why historical calendars for that period show a sudden jump in dates.
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