Easter (Greek: Πάσχα Paskha, from Hebrew: פֶּסַח Pesakh,) is the most important annual religious feast in the Christian liturgical year.^[1] According to Christian scripture, Jesus was resurrected from the dead on the third day after his crucifixion. Some Christians celebrate this resurrection on Easter Day or Easter Sunday^[2] (also Resurrection Day or Resurrection Sunday), two days after Good Friday and three days after Maundy Thursday. The chronology of his death and resurrection is variously interpreted to be between AD 26 and AD 36. Easter also refers to the season of the church year called Eastertide or the Easter Season. Traditionally the Easter Season lasted for the forty days from Easter Day until Ascension Day but now officially lasts for the fifty days until Pentecost. The first week of the Easter Season is known as Easter Week or the Octave of Easter. Easter also marks the end of Lent, a season of fasting, prayer, and penance.

Easter is a moveable feast, meaning it is not fixed in relation to the civil calendar. The First Council of Nicaea (325) established the date of Easter as the first Sunday after the full moon (the Paschal Full Moon) following the vernal equinox.^[3] Ecclesiastically, the equinox is reckoned to be on March 21 (regardless of the astronomically correct date), and the "Full Moon" is not necessarily the astronomically correct date. The date of Easter therefore varies between March 22 and April 25. Eastern Christianity bases its calculations on the Julian Calendar whose March 21 corresponds, during the twenty-first century, to April 3 in the Gregorian Calendar, in which calendar their celebration of Easter therefore varies between April 4 and May 8.

(... from Wikipedia on 2010-03-05 09:07:52 )