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the PFM date has always been the EFM date after March 20 (which was the equinox date in 325 A. One additional February 29 date will need to be removed in about 4140 A.
The aim of the Easter Dating Method is to maintain, for each Easter Sunday, the same season of the year and the same relationship to the preceding astronomical full moon that occurred at the time of his resurrection in 30 A. March 20 has become the important date in recent Easter dating methods.
The present method describing the Easter Dating Procedure can be found in Christian Prayer Books.
This procedure has been dramatically simplified by Ronald W. See Finding Easter Sunday Dates with a Calculator for a clear and unique explanation of this procedure.
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.
There are four steps to calculating the Orthodox Easter Sunday date: Use the total result from step 2 to find the day of week of the PFM date in Table E, then add the number of days shown to the PFM date to find the Julian calendar Easter Sunday date.
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.
Looking at Table E, this 9 shows that this PFM date occurs on a Tuesday, so we need to add 5 days to find the next Sunday, which is April 10.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.The Julian calendar date Thursday October 4, 1582 was followed by the Gregorian calendar date Friday October 15, 1582. Consequently, their Easter Sunday dates are identical up to 1582, then from 1583 onwards often differ from those of Western churches.