The Truth of God's Word goes hand and hand with the history of His creation. The correct history.

Nicea Ruling on Easter Day - 325 A.D.

Diane Severance, Ph.D. and Dan Graves, MSL

 What is the most important day in the Christian year? Ask the average person in the United States and chances are you will hear "Christmas." But in the early centuries of the church, the day of the resurrection was more important.

 From its earliest days, the church annually celebrated the anniversary of Jesus' resurrection, often calling the holiday the Christian Passover. (The Greek name for Passover was Pasch, so Easter is sometimes called Paschal; Easter is an English word.) Even while the apostles were alive, Christians moved their day of worship to Sunday because Christ had risen from the grave on the first day of the week. Christians were often baptized at Easter.

 In the second century, however, a debate arose over when to celebrate the resurrection. Most churches held the festival on the Sunday closest to the Jewish Passover. Sometimes there was doubt as to which of the two nearest Sundays should be observed. The churches in Asia Minor frequently observed the resurrection on the date of the Jewish Passover, even when it was not on a Sunday. In Rome, different congregations observed different days!

 During the first three centuries of the church, it was frequently under persecution and there was no attempt to standardize the Christian festivals. However, when Constantine became emperor and Christianity was no longer illegal, it was possible to consider more carefully the date of Easter. One of the purposes of the Council of Nicea in 325 was to settle that date.

 Constantine did not want Easter to be celebrated on the Jewish Passover. He said it was a Christian "duty to have nothing in common with the murderers of our Lord" (ignoring the fact that Christ's execution was a joint effort of Jews and Gentiles).

 The Council of Nicea accordingly required the feast of the resurrection to be celebrated on a Sunday and never on the day of the Jewish Passover. Easter was to be on the Sunday after the first full moon following the Spring equinox. This meant the date of Easter would always fall between March 22nd and April 25th. Today, March 22, is the earliest date on which Easter can fall. Since there is seldom a full moon on March 21st, Easter does not often fall on the 22nd. The last time it did was in 1818. In the twentieth century, it never fell on this day.

 The ruling of the Council was not immediately accepted everywhere. It did not sit well with those who had been celebrating the resurrection on Passover to suddenly learn they were being called heretics. Confusion was also caused because Rome and Alexandria fixed the Spring equinox (the day in the Spring when day and night are equal) by different methods. Eventually, however, the ruling of the Council of Nicea was accepted by all of the western church.

https://www.christianity.com/church/church-history/timeline/301-600/nicea-ruling-on-easter-day-325-ad-11629649.html

Jesus Christ our passover by V.P. Wierwille.

https://www.ucg.org/the-good-news/jesus-wasnt-crucified-on-friday-or-resurrected-on-sunday-how-long-was-jesus-in-the