You argue the resurrection was on a Sunday, but it was actually on a
Saturday evening. Christ was buried just before sundown: and
3 days/3 nights add up to a just before sundown resurrection. Jesus was crucified on a Wednesday. The Romans said it was Friday because of the sundown Sabbath was approaching. But it says in John 19:14 it was the preparation day (crucifixion day) which is the day before the annual Sabbath of the First Day of Unleavened Bread. Ask any Jew what the preparation day is. An annual Sabbath is called a high day.
John 19:31:
"The Jews therefore, because it was the preparation, that the bodies should not remain upon the cross on the sabbath day, (for that sabbath day was an high day,) besought Pilate that their legs might be broken, and that they might be taken away."
John 20:1:
"The first day of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre."
Three days and three nights raises Him on Saturday evening. He had already risen unseen by early Sunday. Jesus was talking with Mary saying he had not ascended to His Father yet:
John 20:16-18:
“Jesus saith unto her, Mary. She turned herself, and saith unto him, Rabboni; which is to say, Master. Jesus saith unto her, Touch me not; for I am not yet ascended to my Father: but go to my brethren, and say unto them, I ascend unto my Father, and your Father; and to my God, and your God. Mary Magdalene came and told the disciples that she had seen the Lord, and that he had spoken these things unto her.”
John 20:19:
“Then the same day at evening, being the first day of the week, when the doors were shut where the disciples were assembled for fear of the Jews, came Jesus and stood in the midst, and saith unto them, Peace be unto you.”
Later that same day He appeared to His disciples and they could touch Him. That is when He told Thomas to touch His wounds and then He ate with them. So, we can say for sure the ascension was on Sunday. We are given a picture of His ascension as the wave sheaf day: [look up wave sheaf day for yourself] when the first fruits were waved before God as a tribute. This was always done on the first Sunday after Passover.
Before Sundown Wednesday – before Sundown Thursday – Day 1
Before Sundown Thursday – before Sundown Friday – Day 2
Before Sundown Friday – before Sundown Saturday – Day 3
Three days and three nights raises Him on Saturday evening before sundown. He had already risen unseen by early Sunday.