In October 1582, ten days were removed from the calendar to make way for the Gregorian calendar: October 5–14, 1582 were not lived. The Catholic Church adopted the Gregorian calendar, which was instituted by Pope Gregory XIII in 1582, to account for extra days that had accumulated under the Julian calendar. The Julian calendar was 365.25 days long, while the solar year is 365.24219 days long, so each Julian year added an extra day. The Gregorian calendar also established a more accurate method for calculating leap years to prevent future extra days.
