Jesus was crucified outside the walls of Jerusalem, near the garbage dump -- the "usual" place for the death of political prisoners. His body SHOULD have been thrown ito the garbage dump and eaten by dogs, but instead His body was taken off the cross by Joseph of Aramathea (a rich man) and laid in the tomb dug for J. of A. Thus fulfilling the prophecy of Isaiah 53:9:
"He was assigned a grave with the wicked,
and with the rich in his death,"
[He should have been thrown in the garbage like other criminals]
[But Joseph of Aramathea gave him his own tomb]
The Sabbath day is a day of rest. God "rested" on the Seventh Day, which the Jews understand to be Saturday -- but this is ONLY by the HUMAN calendar, which specifies "Saturday" as the Seventh Day.
The fact is, for the purpose of corporate worship (the gathering together of people to worship God) ANY day is a Sabbath, since God put NO restrictions on when He could (or should) be worshiped. In fact, in the time of Jesus there were "Special Sabbaths" which occured in the middle of the week, on any day.
[In fact, Jesus was killed on Preparation Day, the day before the Sabbath. But it is ALSO described that that particualr Sabbath was a "Special Sabbath". it MAY have occured on a Thursday, and Jesus was killed on WEDNESDAY, not Friday! this is the ONLY way that Jesus could have fulfilled his own words about "the sign of Jonah", which is "Three DAYS and three NIGHTS in the belly of the fish". this is NOT "today, tomorrow, and the next day", but a strict 72-hour period that Jesus spent in the grave.]
And again, remember that jesus came "not to destroy the law, but to fulfill it". After Jesus' death, those old laws about worshipping on the Seventh Day, paying tithes, sacrificing bulls, eating pork, or being circumcized no longer apply!
Saturday, Sunday, Wednesday -- or Monday, Tuesday, Thursday, or Friday. ALL are equally suitable as Sabbath Days.