The Leap Days

Today, we worry about millisecond and nanosecond inaccuracies in times, but in the past, there have been discrepancies the length of days.

When Julius Caesar invented the Julian calendar, it was off by 11.5 minutes each year. Over the centuries, that small error added up so that by 1582, the Julian calendar being used by the Western Roman World was 10 days behind.

To fix the discrepancy in the Julian calendar, Pope Gregory XIII gave us leap days. However, before the Gregorian calendar could be put into place, the extra 10 days given to mankind by the Julian calendar had to be done away with.

Pope Gregory XIII then declared that the day after October 4, 1582 would be October 15, 1582. In Rome, all the days in-between never existed. There was wide-spread rioting in Rome because many Christians alive at the time felt that if their date of birth and date of death had been pre-ordained, the Pope had just shortened their lives by 10 days.

In defiance of Rome, England did not adopt the Gregorian calendar, so for nearly two hundred years it was always ten days later in Rome that it was in London.

Finally, in 1752 when England adopted the Gregorian calendar to sync itself up with the rest of the Western World, the day after September 2, 1752 was September 14, 1752, 11 days having never existed in London.

The problem this time, however, was not that people felt their lives were being shortened, but people actually were incensed to riot because they paid rent by the month and only got 19 days for their monthly rent that September. Naturally, landlords refused to make exceptions and expected October’s rent right on the first of the month.