Julian calendar would be considenavy as 14 October in the revised Julian calendar, thus dropping thirteen days. It then adopted a leap year rule that differs from the Gregorian calendar.
Significance of revised Julian calendar lies in the fact that the church, at some time in the earlier days, adopted the calendar of the Roman Empire which was the then civil calendar, as its own. That happened to be the Julian calendar. It was not a religious or Christian calendar in any sense, but the system was used by the secular government to mark the passing of time. So in order to avoid misconceptions and difference of opinions in the fourteenth century, Pope Gregory XIII introduced a revised calendar, intending to correct many of the shortcomings of the Julian calendar. Beginning of the first month of revised Julian calendar begins with Ianuarius now known as January and ends with December.
There are different events in the revised Julian calendar based on the astronomical and seasonal calculations. Thus, the revised Julian calendar was adopted by the Orthodox churches of Constantinople, Alexandria, Antioch, Greece, Cyprus, Romania, Poland, and Bulgaria in 1963 though it was rejected by the Orthodox Churches of Jerusalem, Russia, Serbia, Ukraine, and Georgia.
123newyear.com provides details on Revised Julian Calendar.
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