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Orthodox churches became fully autonomous in 1054 A.D., and celebrate their Easter always on the basis of the Julian calendar and the "19 PFM dates" table. Easter Day was celebrated either: (a) on or just after the first day of the Jewish Passover (no matter on which day of the week that Easter Day occurred), or (b) on a Sunday close to or on the first Passover Day. Precise information on this subject can be found on pages 415 to 425 of the Explanatory Supplement to the 1961 Astronomical Ephemeris. It became defined as the Sunday following the Paschal Full Moon date for the year, using a simple "19 PFM dates" table.To determine the Orthodox Easter Sunday date, it is first necessary to find the Julian Easter Sunday date, then to add the number of days which have been "skipped" in the Gregorian calendar.See Finding Orthodox Easter Sunday Dates with a Calculator for a simple explanation of this procedure.
In most years, Orthodox Easter follows Western Easter by one or more weeks.
Looking at Table E, this 6 shows that this PFM date occurs on a Saturday, so we need to add 1 day to find the next Sunday, which is March 22, the Easter Sunday date for the year 2285 A. Other examples: Julian calendar example: Year 887: Step 1: PFM=A12, Step 2: 3 4 3 = 10, Step 3: A12 4 = April 16, 887 Gregorian calendar examples: Year 1987: Step 1: PFM=A13, Step 2: 4 1 3 = 8, Step 3: A13 6 = April 19, 1987 Year 2987: Step 1: PFM=A4, Step 2: 2 5 3=10, Step 3: A4 4 = April 8, 2987 Year 3987: Step 1: PFM=M27, Step 2: 1 1 3=5, Step 3: M27 2 = March 29, 3987 INDEX This accurate procedure applies to Orthodox churches, which always base their calculations on the Julian calendar and the "19 PFM dates" table. D., and takes no account whatsoever of the changes resulting from the introduction of the Gregorian calendar in 1582. These instructions show the procedure for years 1054 to 3399 A. However, this simple method continues indefinitely, because the Julian calendar always has a February 29 date in every fourth year.