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.There are three steps to calculating the Easter Sunday date: Find the Easter Sunday date from Table E Table A below shows PFM dates for years 326 to 2599 A. If you're looking further into the future, click here to see another Table A for years 2600 to 4099 A. 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 Easter Sunday date.For example, year 2285 gave us a PFM date of March 21, and step 2 gave us a total result of 6.For example, year 1995 gave us a PFM date of April 5, and step 2 gave us a total result of 9.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.
In some years the Orthodox Easter Sunday occurs on the same day as the Western Easter Sunday.
INDEX This procedure is a dramatic and accurate simplification of the official procedure used to calculate Easter Sunday dates, as described in Christian Prayer Books. It requires just one division on a calculator, and three simple additions.
Paschal Full Moon dates are copied directly from these Books. This procedure appears more compactly in the 1988 Australian Almanac (titled "The Dating of Easter") held in the Canberra Library, Australia.
For example, this occurred in 1990 because the Western Easter Sunday date of (Gregorian calendar) April 15, 1990 is the same as the Orthodox Easter Sunday date of (Julian calendar) April 2, 1990.
In most years, Orthodox Easter follows Western Easter by one or more weeks.