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In 1582 CE Pope Gregory XIII, reformed the Julian calendar when he made October the 5th into October the 15th, omitting 10 days, to realign the calendar with the seasons. He also eliminated leap years at the century mark, starting in 1700 CE, unless the century could be divided by 400. This correction eliminates three leap years every four hundred years. These corrections became necessary, in part, because the Gregorian calendar exists as a totally solar calendar, depending only on the earth�s relationship with the sun (Burnaby 1901:512). 

The advantage of using the Gregorian calendar and the BCE (before the common era) and CE (common era) system of dating consists of its simplicity and utility. The BCE/CE system provides an easy, convenient frame of reference. The drawback consists of there being no year 0.

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