Dating 1st base

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.

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.

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.

In some years the Orthodox Easter Sunday occurs on the same day as the Western Easter Sunday.

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.

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.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).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.

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