[Uri’el-2012]

Actually I have studied up on the issue. I’m convinced that, since the New Testament period, starting with the Church plants of Paul, the Church amidst (primarily) gentiles, has gathered for worship on Sunday...celebrating the absolute guarantee of the completion of the New Creation in the resurrection of Jesus.

Just as God rested on Saturday, upon completion of the Old Creation, so too, God-the-Son-in-human-flesh rested on Sunday from the keystone act of the New Creation, Jesus’ resurrection. Our worship corresponds to a miracle greater than even Creation itself... our Messiah’s resurrection—and our justification.

Centuries before Constantine (why does the poor emperor get blamed for everything?) Christians were worshiping on Sunday.

We have no knowledge that Yah'shua rose on Sunday.

We do know He rose on the first day of the week
which began at sundown on Saturday.

Careful reading of the Holy Scriptures will demonstrate that
Yah'shua rose on the YHvH commanded Feast of First Fruits.
It is all spelled out in Leviticus 23.
It is the day following the Sabbath following Passover.

May you seek the face of YHvH in His WORD.

shalom b'SHEM Yah'shua HaMashiach

[Jonty30]

To add to that. The Jews didn’t properly prepare Christ’s burial because He died just before the sixth day ended, but they also rested the seventh day. It was at the first opportunity the Sabbath day ended did they go and attend to it, and He was risen.