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*The [[Gregorian Calendar]], a calendar introduced in 1582 by Pope Gregory XIII of the [[Roman Catholic Church]]
*The [[Revised Julian Calendar]], the calendar considered by a [[synod]] of Orthodox churches in 1923 in Constantinople. This is functionally identical to the Gregorian Calendar except for the Paschal cycle, which is still reckoned according to the Julian timetables.
[[Category:Church History]]
[[Category:Liturgics]]