Easter is indeed a Christian adaptation of an Anglo-Saxon rite of celebration of a new crop season, named after the goddess Eastre. The early Christians found that the feast of Eastre coincided with their celebration of the re-birth of Christ, so they 'adopted' it, and gradually introduced the Christian concept, changing the spelling in the process. The date of Easter - March 22 - April 25 is determined by moon phases and a calculation created over a thousand years ago, and lasting in perpetuity. Eggs are used in common with a number of pagan religions who regard the egg as a symbol of re-birth. The Easter Bunny again dates back to Eastre - her earthly form was said to be that of a rabbit.