
Ten days vanish as the Gregorian calendar begins
In the Catholic countries that first adopted it, Thursday 4 October 1582 was the last day of the old Julian calendar: the next day was Friday 15 October. Pope Gregory XIII had ordered the change in the bull Inter gravissimas earlier that year, to bring the calendar back into line with the seasons and the date of Easter.
The Julian calendar’s year was slightly too long, and by the 16th century it had drifted ten days out of step with the Sun. The new rules dropped three leap years every four centuries. Protestant and Orthodox countries switched much later; Britain and its colonies not until 1752.
Read the full storyHistory & Timeline →Source: Encyclopaedia Britannica: Inter gravissimas ↗


















