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.
BASIC code is fairly straightforward, and can easily be converted to other programming languages.
For example, English Easter Sunday date for 1750 A. The Gregorian calendar omits certain February 29 dates to keep its dates aligned with the seasons and position of Earth in relation to the Sun. 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.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.