In 1752, from Sept. 3rd to Sept. 13th, people witnessed a unique historical event. Eleven days were cut from the calendar and deleted forever. These days simply don’t exist, with no births, no marriages, and no deaths. The people in Britain went to bed on Sept. 2, 1752, and woke up the next day on Sept. 14, 1752, because they switched from the Julian calendar to the Gregorian calendar.
Our clock time and calendar move faster than solar time. To keep the clocks and calendar aligned with solar days, Julius Caesar introduced the leap year concept in 46 B.C., but the Julian calendar was moving one day back every 128 years, making the year longer and slower than the actual solar year. In 1582, the Julian calendar was 10 days behind the solar calendar. So Pope Gregory XIII corrected the Julian calendar by pushing the calendar 10 days forward. In 1752, the British followed.