"Jesus is risen!"

Common Easter greeting in Eastern and Russian Orthodox churches except they have a different method of calculating the date of Easter.

Orthodox Easter: Why are there two Easters?

Orthodox Christians celebrate Easter later than the Western Church - here’s why.

BBC NewsroundBBC Newsround

The promptness of the celebration of Jesus' resurrection on the first Sunday after the first moon following the vernal equinox was apparently the cause of some of the disputes that originally led to the Great Schism between the Eastern and Western churches.

This is the date that was or would have been decreed, presumably by the Emperor Constantine, when the Pagans refused to believe in the Resurrection of Christ unless they were told what should be the signs in the sun, moon, and stars of His coming.

It is for this reason that the Emperor did not give a numbered date on one of the twelve named Roman months for the feast or use the Jewish calendar, but instead used the star calendar directly with reference to the sun and the moon to specify the date of the feast of Jesus' Resurrection.

However it would seem reasonable to believe in the living and Resurrected Lord Jesus on every day of the year and at all times and places, and never to deny that He is risen indeed, or to obstruct the delivery of the Good News to poor and repentant sinners.

And there is Good News indeed, but old trespass ordinances and vice banns continue to hinder and obstruct it, and we must make war to overcome these enemies, until we are able to worship in peace and maintain our weapons at home without fear of wrongful arrest.

Four centuries later, Easter’s date remains divisive. Some church leaders want that to change

Eastern and Western churches will celebrate Easter on the same day this year, while marking 1,700 years since the Council of Nicaea unified Christian doctrine.

AP NewsDEREK GATOPOULOS, COLLEEN BARRY and LEFTERIS PITARAKIS