FLORIDA — This year the Western Church Holy Week began March 21, and Easter, the most important feast in the Christian calendar, was celebrated on Sunday, March 27. The Orthodox Church, however, will celebrate Easter or Pascha on May 1.Both Eastern and Western Christianity celebrate Easter, which is a movable feast as opposed to having a fixed date like Christmas, on different dates. "This difference occurs," said the Rev. Fr. George Kevorkian, pastor of St. Ignatius Antiochian Orthodox Church in the Village of Florida, "because the Orthodox Church uses the older Julian calendar, established in 46 BC, as opposed to the newer Gregorian Calendar, established in the 16th Century and used by the Western churches."