Revised Julian calendar

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The Revised Julian calendar or, less formally, New Calendar, is a calendar, originated in 1923, which effectively discontinued the 340 years of divergence between the naming of dates sanctioned by those Eastern Orthodox churches adopting it and the Gregorian calendar that has come to predominate worldwide. In 2800 the two calendars will diverge again, though more slowly than the Julian and Gregorian do. This calendar replaced the Ecclesiastical Calendar based on the Julian Calendar in use by the Eastern Orthodox Church since the first Ecumenical Council of Nicea in 325 AD.[1] The Revised Julian Calendar aligned its dates with the Gregorian Calendar proclaimed in 1582 by Pope Gregory XIII for adoption by the Roman Catholic Church.[2]



The new calendar was proposed for adoption by the Orthodox churches at a synod in Constantinople in May 1923. The synod, chaired by controversial Patriarch Meletius IV of Constantinople, and called Pan-Orthodox by its defenders, did not have representatives from the remaining Orthodox members of the original Pentarchy (the Patriarchate of Jerusalem, Antioch, and Alexandria) or from the largest Orthodox Church, the Russian Orthodox Church, then under persecution from the Bolsheviks, but only effective representation from the Patriarch of Constantinople and the Patriarch of Serbia.[3] This synod synchronized the new calendar with the Gregorian calendar by specifying that the next 1 October of the Julian calendar would be 14 October in the new calendar, thus dropping thirteen days. It then adopted a leap year rule that differs from that of the Gregorian calendar: Years evenly divisible by four are leap years, except that years evenly divisible by 100 are not leap years, unless they leave a remainder of 200 or 600 when divided by 900, then they are leap years. This means that the two calendars will first differ in 2800, which will be a leap year in the Gregorian calendar, but a common year in the new calendar. This leap year rule was proposed by the Serbian scientist Milutin Milanković, an astronomical delegate to the synod representing the Kingdom of Serbs, Croats and Slovenes.[4][5]

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