In Orthodoxy, the season of Pascha begins on Pascha and ends with the coming of the fortieth day, the Feast of the Ascension.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.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.
It has come to be the first Sunday after the ecclesiastical full moon that occurs on or soonest after 21 March, but calculations vary in East and West.
Easter is linked to the Jewish Passover by much of its symbolism, as well as by its position in the calendar.
The most widely accepted theory of the origin of the term is that it is derived from the name of a goddess mentioned by the 7th to 8th-century English monk Bede, who wrote that Ēosturmōnaþ (Old English 'Month of Ēostre', translated in Bede's time as "Paschal month") was an English month, corresponding to April, which he says "was once called after a goddess of theirs named Ēostre, in whose honour feasts were celebrated in that month".
In Greek and Latin, the Christian celebration was, and still is, called Πάσχα, Pascha, a word derived from Aramaic פסחא, cognate to Hebrew פֶּסַח (Pesach).
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