Did you know that October 5th – October 14th, 1582 did not exist. I mean, never. We just skipped those days. And this is why.
On Oct. 5, 1582, much of Europe replaced the Julian calendar with the Gregorian calendar; the switch required the 10 days after Oct. 4 to be skipped.
In October 1582 the change from the old, Julian calendar to the new, Gregorian was implemented. To do so and in order to have the calendar back into line with the seasons, Pope Gregory XIII deleted 10 days from the year 1582, so that October 4th, 1582, of the Julian calendar was immediately followed by October 15th, 1582, in the Gregorian calendar. Thus the period from October 5th to October 15th, 1852 never existed!
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This change was explained in a 4-page edict named “Pragmatica” on the Ten Days Of The Year which was issued by King Philip II of Spain, decreeing the change from the Julian to the Gregorian calendar.
No countries continue to use the Julian calendar, but it is still used by many Orthodox churches. The Eastern Orthodox Church’s use of the Julian calendar, which is currently 13 days behind the Gregorian calendar, results in Easter being celebrated on different dates in most years.
The Gregorian calendar is a solar calendar. A regular Gregorian year consists of 365 days, but as in the Julian calendar, in a leap year, a leap day is added to February. In the Julian calendar a leap year occurs every 4 years, but the Gregorian calendar omits 3 leap days every 400 years.