Easter, the principal festival of the Christian church year, celebrates the Resurrection of Jesus Christ on the third day after his Crucifixion. The exact date of Easter varies each year, falling on a Sunday between March 22 and April 25. Easter date is determined on a lunisolar calendar similar to the Hebrew calendar; it is the first Sunday after the Paschal Full Moon, which is the first full moon on or after March 21. This means Easter can fall on any Sunday within a 35-day range. For...