Since 1582, we have relied on the Gregorian calendar to keep us almost perfectly in line with the rotation of the earth around the sun. Pope Gregory XIII issued a papal bull, "Inter Gravissimus" on February 24, 1582 that established the Gregorian calendar as the new and official calendar of the Catholic world. Since the Julian calendar had fallen ten days behind over the centuries, Pope Gregory XIII designated that October 4, 1582 would be officially followed by October 15, 1582. Learn more about the Gregorian calendar.
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