Easter (Old English: Ēostre; Greek: Πάσχα, Paskha; Hebrew: פֶּסַח, Pesakh, "Passover") is the central feast in the Christian liturgical year. According to the Canonical gospels, Jesus rose from the dead on the third day after his crucifixion. Some Christians celebrate this resurrection on Easter Day or Easter Sunday (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 36, traditionally 33.
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. The first week of the Easter Season is known as Easter Week or the Octave of Easter. The week from Palm Sunday to Easter is known as Holy Week. 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 northern hemisphere's vernal equinox. Ecclesiastically, the equinox is reckoned to be on March 21 (even though the equinox occurs, astronomically speaking, on March 20 in most years), 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 21st century, to the 3rd of April in the Gregorian Calendar, in which calendar their celebration of Easter therefore varies between April 4 and May 8.
Easter is linked to the Jewish Passover by much of its symbolism, as well as by its position in the calendar. In most European languages the feast called Easter in English is termed by the words for passover in those languages and in the older English versions of the Bible the term Easter was the term used to translate passover.
Secular customs, such as the Easter Bunny and Easter egg hunts, have become part of the holiday's modern celebrations and are often observed by Christians and non-Christians alike. There are also some Christian denominations who do not celebrate Easter. (See section below.)