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No details for the computation were specified; these were worked out in practice, a process that took centuries and generated a number of controversies.It has come to be the first Sunday after the ecclesiastical full moon that occurs on or soonest after 21 March, but calculations vary.Paul states, "Get rid of the old yeast that you may be a new batch without yeast—as you really are.For Christ, our Passover lamb, has been sacrificed"; One interpretation of the Gospel of John is that Jesus, as the Passover lamb, was crucified at roughly the same time as the Passover lambs were being slain in the temple, on the afternoon of Nisan 14.Easter therefore varies between 4 April and 8 May in the Gregorian calendar (the Julian calendar is no longer used as the civil calendar of the countries where Eastern Christian traditions predominate).Also, because the Julian "full moon" is always several days after the astronomical full moon, the eastern Easter is often later, relative to the visible moon's phases, than western Easter.Easter and the holidays that are related to it are moveable feasts which do not fall on a fixed date in the Gregorian or Julian calendars which follow only the cycle of the sun; rather, its date is determined on a lunisolar calendar similar to the Hebrew calendar.
Because of the 13-day difference between the calendars between 19, 21 March corresponds, during the 21st century, to 3 April in the Gregorian Calendar.
Among the Oriental Orthodox some churches have changed from the Julian to the Gregorian calendar and the date for Easter as for other fixed and moveable feasts is the same as in the Western church.
However, this does not precisely reflect the ecclesiastical rules.
The First Council of Nicaea (325) established two rules, independence of the Jewish calendar and worldwide uniformity, which were the only rules for Easter explicitly laid down by the Council.
(See also Computus and Reform of the date of Easter.) In particular, the Council did not decree that Easter must fall on Sunday. The following day, Easter Monday, is a legal holiday in many countries with predominantly Christian traditions.
Josephus, Jewish War 6.10.1/423 ("They sacrifice from the ninth to the eleventh hour").