Why does Easter move every year? EVERY December I buy the same type of thin pocket diary, and every New Year’s Day I fill in the details. There are spaces for name, address, phone number, email and blood group. The next thing I do is look up Easter and plan my time off accordingly. Unlike Christmas, St Valentine’s Day and April Fools’ Day, Easter is a movable feast, and shifts around confusingly — in mysterious ways, you might say. A little Irish history might again be permissible here, and serve to demonstrate the point. The Easter Rising of 1916 took place on April 24 and the Good Friday Agreement of 1998 was cemented on April 10.