Amongst the countries celebrating Christmas today are Ethiopia, Russia, Ukraine, Macedonia and Moldova.
The Julian calendar was introduced in 45 BC by Julius Caesar and by 1582 was replaced by the Gregorian calendar. There is a 13-day difference between the Julian calendar and the Gregorian calendar, introduced by Pope Gregory XIII.
Despite the fact that the Church of Greece and all Greek Orthodox churches celebrate Christmas on December 25, the stavropegial Eastern Orthodox monasteries on Mount Athos still follow the Julian calendar.
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