"During the later periods of Roman history, sun worship gained in importance and ultimately led to what has been called a “solar monotheism.”
Nearly all the gods of the period were possessed of solar qualities, and both Christ and Mithra acquired the traits of solar deities.
The feast of Sol Invictus (Unconquered Sun) on December 25 was celebrated with great joy, and eventually this date was taken over by the Christians as Christmas, the birthday of Christ."
Sun worship | religion
www.britannica.com seems to be current
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The Origins of Easter and sunrise service
Roman Rite - Wikipedia
The Roman Rite has been adapted over the centuries by the Catholic Church, following the old Antiquity of the Roman Mass a Liturgical_rite they adapted from times of old before Christ, it reads
"It is still redolent of that liturgy, of the days when Caesar ruled the world and thought he could stamp out the faith of Christ, when our fathers met together before dawn and sang a hymn to Christ as to a God."
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Another result of the council was an agreement on when to celebrate Easter which is simply stated:
We also send you the good news of the settlement concerning the holy pasch, namely that in answer to your prayers this question also has been resolved. All the brethren in the East who have hitherto followed the Jewish practice will henceforth observe the custom of the Romans and of yourselves and of all of us (who from ancient times) have kept Easter together with you.[13]
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It was changed to Easter, to observe a roman
costume that dates way before Christ was born
of a virgin.
Because the celebration of Easter was tied to the spring equinox, the Roman Catholic Church considered this steady drift in the date of Easter undesirable.
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Polycarp and the Quartodeciman Controversy
After the death of the apostle John, a disciple of his, Polycarp, waged a controversy over the Passover-Easter question with the bishop of Rome, by then leader of the church
This theological battle was called the Quartodeciman Controversy.Polycrates contended, as Jesus and the original apostles taught, that the Passover should be observed in the new Christian form introduced by Jesus and by the apostle Paul (1 Corinthians 11),
using unleavened bread and wine instead of sacrificing a lamb, on the eve of the 14th Nisan (first month in the sacred calendar,occurring in the spring).
But [the Rome church] insisted that it be
observed on a Sunday.
Quartodecimanism - Wikipedia
Easter controversy - Wikipedia
Polycarp was a disciple of John the Apostle
Polycarp - Wikipedia