He is risen! Catholics and Protestants celebrate together the resurrection of Jesus Christ, conceived of the Holy Spirit, born of the Virgin Mary, suffered under Pontius Pilate, Crucified, dead, and buried. The Counsel of Nicaea (A.D. 325) determined that Easter would be celebrated on the first Sunday after the vernal (spring) equinox. This Sunday was chosen because the Jewish Passover (the feast Jesus participated in as the Lamb of God who takes away the sins of the world) is normally begun on the 14th day of Nisan according to the Jewish Calendar. The 14th day of Nisan is normally a full moon, which occurred at exactly 8:01AM, March 23, this year (2016).
Media Source: By Fresco in Capella Sistina, Vatican – http://ariandjabarimchenry.com/first-council-of-nicaea/, Public Domain, https://commons.wikimedia.org/w/index.php?curid=30734368
Because the Orthodox Church did not adopt the Gregorian Calendar in October 1582, when Pope Gregory XIII instated it, their calculation of Easter remains true to the Counsel of Nicaea, yet it varies from Catholic and Protestant celebrations by about 13 days. Yet, Catholic, Orthodox, Protestant, other eastern churches celebrate the same Victor, the Lamb, the Son of Man, the Crucified God, and the Christ.
And Jesus prayed: “My prayer is not for them [the disciples] alone. I pray also for those who will believe in me through their message, that all of them may be one, Father, just as you are in me and I am in you. May they also be in us so that the world may believe that you have sent me.” –John 17:20-21
In as far as the Church is submitting to Christ, She is at peace. He is Risen. Happy Easter!
Eastern Orthodox Easter: (http://www.goarch.org/ourfaith/ourfaith7070)