D., at the Council of Nicaea, the Western Church resolved to established a more standardized system for determining the date of Easter.As astronomers were able to approximate the dates of all the full moons in future years, the Western Christian Church used these calculations to establish a table of Ecclesiastical Full Moon dates.These dates would determine all of the Holy Days on the Ecclesiastical calendar.

Roman Catholics, Protestants, and Anglicans, as well as members of the Armenian Apostolic Church, all celebrated Easter very early this year, on 23 March.Passover, the 15th of Nisan on the Jewish calendar, would normally fall on the day of the first full moon on or after the vernal equinox.At that time the date of Passover, as observed by rabbinical Jews, depended upon observation of nature, not computation.Countless Christians worldwide maintain that such proof exists: It is the Shroud of Turin, revered as the authentic burial cloth of Jesus Christ.The earliest undisputed historical records place the Shroud in Lirey, France, between 13.