[Campion]

Constantine formalized it in the Nicean Council.

Constantine never knew anything of "Easter". The holiday to him was "Pascha", the same Greek word used for the Passover of the Jews and obviously derived from the Hebrew pesach. (The same word is used in Latin and all languages derived from it.) You can prove that simply by reading the decree of Nicaea on the dating of Easter in the original Greek; it's online.

The Anglo-Saxon word "Easter" came to be applied to a Christian religious holiday in England and Germany long after Constantine was dead and buried.

Easter, coming from the pagan religions of the east

It had nothing to do with any "pagan religions of the east".

is tied to the solar calendar. Passover is based on the lunar calendar

The calculation of the date of Pascha/Easter is complicated, but it isn't strictly solar. It's a hybrid system that involves both the solar calendar (Gregorian in the west; Julian in the east) and a heuristic lunar equivalent. That's why it falls on different dates each year.

(It's the first Sunday after the first new moon after the vernal equinox, March 21; however, the date of the "first new moon" is calculated using a system of tables, not by actual astronomy.)

[safisoft]

(It's the first Sunday after the first new moon after the vernal equinox, March 21; however, the date of the "first new moon" is calculated using a system of tables, not by actual astronomy.)

OK, now read Leviticus 23 and tell me where your calculation comes from.

The fact is the Quartodeciman Controversy is the gravitational pull that knocks such nonsense off its axis. Consider why numerous church councils had to threaten excommunication to those who celebrated Passover, on the dates the Jews had calculated. It took several hundred years of threats and persecution to eliminate the date of Passover for the church. Why?

Go on. Admit it. The Roman Catholic church proudly proclaims that it had the authority to change the Sabbath and the date of the Resurrection. Why not just admit that the date is the date, by MAN'S DECREE?

If G-d wrote in the sky that Messiah would return on Passover, it is a sad thing that nearly all "Christians" would have to ask their Jewish neighbors what the date was... Not so, the John, Peter, or Paul, or any of the congregations they helped establish...