The Change from the Julian to the Gregorian Calendar

Change from the Julian to the Gregorian Calendar The Gregorian calendar, which is the calendar used today, was first introduced by Pope Gregory XIII via a papal bull in February 1582 to correct an error in the old Julian calendar. This error had been accumulating over hundreds of years so that every 128 years the calendar was out of sync with the equinoxes and solstices by one additional day. As the centuries passed, the Julian Calendar became more inaccurate. Because the calendar was incorrectly determining the date of Easter, Pope Gregory XIII reformed the calendar to match the solar year so that Easter would once again "fall upon the first Sunday after the first full moon on or after the Vernal Equinox.". Ten days were omitted from the calendar to bring the calendar back in line with the solstices, and Pope Gregory XIII decreed that the day following Thursday, October 4, 1582 would be Friday, October 15, 1582 and from then on the reformed Gregorian calendar would be used. The Catholic countries of Italy, Poland, Portugal, and Spain immediately observed the calendar change, but for almost two hundred years Protestant countries refused to change to the new calendar because it had reformed by a Catholic Pope. The Greek Orthodox countries didn't make the change until the start of the 20th century. Great Britain & colonies changed on Sept 2, 1752 to Sept 14, 1752

Change from the Julian to the Gregorian Calendar The Gregorian calendar, which is the calendar used today, was first introduced by Pope Gregory XIII via a papal bull in February 1582 to correct an error in the old Julian calendar. ...The Catholic countries of Italy, Poland, Portugal, and Spain immediately observed the calendar change, but for almost two hundred years Protestant countries refused to change to the new calendar because it had reformed by a Catholic Pope. ...Great Britain & colonies changed on Sept 2, 1752 to Sept 14, 1752.