Another important element to calculating Greek Easter is the Spring Equinox. Generally, the date for Easter is set on the first full moon after both the Spring Equinox and Passover. Each year, the date of the Spring Equinox is slightly different. However, since it differs each year, this factor is something else that could affect when Greek Easter falls.
As you can see, calculating when Greek Easter is can be a difficult task and is the main reason why Eastern and Western Easter often fall on different days. Once every few years, however, the days coincide. This is the exception and not the rule. Also, the date for Easter can vary from early to late spring depending on how the calculations fall. 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.
This was achieved in A. This replaced the original A. From 31 A. 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. Both of these methods existed continuously throughout this period.
Easter Sunday date was based on the Julian calendar in use at that time. Precise information on this subject can be found on pages to of the Explanatory Supplement to the Astronomical Ephemeris. The Julian calendar was replaced by the Gregorian calendar in October to re-align March 20 and therefore Easter with the seasons by removing 10 dates October 5 to 14, This replacement did not occur until later in many countries e.
The Gregorian calendar very closely maintains the alignment of seasons and calendar dates by having leap years in only 1 of every 4 century years, namely, those divisible exactly by One additional February 29 date will need to be removed in about A.
March 20 not March 21 is the most common Gregorian Equinox date from to A. Historically, references to March 21 have caused mistakes in calculating Easter Sunday dates. March 20 has become the important date in recent Easter dating methods.
Despite frequent references to March 21, this date has no special significance to any recent Easter dating methods. This procedure has been dramatically simplified by Ronald W. Clean Monday refers to believers being cleaned of their sins during Lent. Lazarus Saturday falls eight days before Easter Sunday and signifies the end of Great Lent, although the fasting continues into Holy Week. Wherever you live in the world, Easter is always a moveable feast day. Unlike Christmas, it doesn't take place on the same day every year.
Orthodox churches in some countries including Greece, Cyprus and Romania base their Easter date on the Julian calendar. The Gregorian Calendar was created by Pope Gregory in to fix some of the glitches in the Julian Calendar as astronomy became more accurate.
Great Britain changed to the Gregorian calendar in Also in the eastern Orthodox Church, Easter must happen after the Jewish festival of Passover - as in the Easter story, Jesus celebrates Passover before his death. In Passover ended on 4 April. Going to church is obviously an important part of the celebrations and important services start from Good Friday. The two churches vary on the definition of the vernal equinox and the full moon. The Eastern Church sets the date of Easter according to the actual, astronomical full moon and the actual equinox as observed along the meridian of Jerusalem, site of the Crucifixion and Resurrection.
The Eastern Orthodox Church also applies the formula so that Easter always falls after Passover, since the Crucifixion and Resurrection of Christ took place after he entered Jerusalem to celebrate Passover. In the Western Church, Easter sometimes precedes Passover by weeks. The Western church does not use the actual, or astronomically correct date for the vernal equinox, but a fixed date March And by full moon it does not mean the astronomical full moon but the "ecclesiastical moon," which is based on tables created by the church.
These constructs allow the date of Easter to be calculated in advance rather than determined by actual astronomical observances, which are naturally less predictable.
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