Easter is always on a Sunday because it originate in the pagan Sun Worship festivals of fertility (thus rabbits and eggs, baby chicks, etc.) "Easter is originally the celebration of Ishtar, the Assyrian and Babylonian goddess of fertility and sex. Ishtar was the goddess of love, war and sex. ... Most scholars believe that Easter gets its name from Eostre or Ostara**, a Germanic pagan goddess." "After Constantine decided to Christianize the Empire, Easter was changed to represent Jesus." It is called Christianized Paganism. Anyhow - it is always on SUNDAY. That is why the date changes every year.