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The example for year 1995 gives the Julian Easter Sunday date of April 10, and Table F shows that we need to add 13 days to convert it to the Gregorian calendar date of April 23.This date is the Gregorian calendar Orthodox Easter Sunday date for year 1995 A. Other examples: Year 1994: Step 1: PFM=A17, Step 2: 1 0 5 = 6, Step 3: A17 1=Julian April 18, 1994, Step 4: Julian A18 13 = Gregorian May 1, 1994 Year 2870: Step 1: PFM=M25, Step 2: 6 5 3 = 14, Step 3: M25 7=Julian April 1, 2870, Step 4: Julian A1 19 = Gregorian April 20, 2870 INDEX Here is an algorithm written in BASIC to calculate the Gregorian Easter Sunday date for years 1583 to 4099 (Western churches only).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. 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. Easter Sunday date was based on the Julian calendar in use at that time.Despite frequent references to March 21, this date has no special significance to any recent Easter dating methods.
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.
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.
This date is the Julian calendar Orthodox Easter Sunday date for year 1995. for Greece in years 1054 to 1922) then this Julian date (e.g.
April 3 in 1922) is their Orthodox Easter Sunday date for that year.
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.