1st base of dating
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. This replacement did not occur until later in many countries e.g. See GM Arts Easter Date Calculations for more information. Both of these methods existed continuously throughout this period. The Julian calendar was replaced by the Gregorian calendar in October 1582 to re-align March 20 (and therefore Easter) with the seasons by removing 10 dates October 5 to 14, 1582. 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 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.Once you know what type of date is on the package (use by or sell by, etc.), the next step is to identify what the code date means. This means that January 1st equals "1" and the last day of the year, Dec 31, is "365." The year can be represented a variety of ways depending on how the manufacturer chooses to list it.There may also be parts of the code the manufacturer uses to track products.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.