This article was written for myself as well since I have waffled on this very issue. The correct diagram of this is in the end of the book that shows the crucifixion on the 14th of Nisan—not the 15th. In the text of the book the diagram is in error. "Good Friday" is the day most Christians accept as the day of the crucifixion of Jesus Christ. However, Jesus' greatest sign was the sign of Jonah where he would be raised from the dead after three days and three nights (John 2:18-22). If Jesus died on Friday as purported, then three days would be Friday, Saturday, and Sunday. However, there are only two nights in this equation (Friday and Saturday--in the Gentile perspective) and really only two days since it is made quite clear that Jesus came out of the tomb before daylight on Sunday morning (John 20:1). It is indeed hard to break from tradition, but the truth comes out in understanding Passover and that is especially easy to misunderstand as Gentiles. Passover is the first grouping of the Lord's Feasts and they were rehearsals of what Messiah would come to do. But these rehearsals were not general. They were specifically timed to the very day. Therefore, Jesus as the Lamb without blemish (sin) was scheduled to die on Nisan 14 or what would become known as the Preparation Day. According to Exodus 12:6 and Leviticus 23:5, that Lamb was to be killed between the evenings on the 14th day of the first month. One of the difficulties many people have with the Jewish Calendar is for the fact that the day begins at sundown. This is because in Genesis 1 the order is evening and morning for each day (see also Leviticus 23:32). So when Jesus has the "Last Supper" the night before his crucifixion, it is part of the same day. The whole thing is accomplished on the same day--the 14th. One tradition that does hold up is Palm Sunday. Here Jesus is presented as King for the first and only time. This day was Nisan 10 and the day that the lamb without blemish was to be taken into the house for inspection until it was to be slain. On this day was Jesus’ triumphal entry into Jerusalem and the Temple Mount. He was then critically examined by the religious leaders of the day until Passover. In fact Jesus wept for Jerusalem on Nisan 10 since the Jews had missed understanding the precise time of their visitation (Luke 19:41-44). Nisan 10 was also the day that Daniel's 69 weeks had been completed and the day that the stones would have cried out if no one else had done so at the entrance of the Messiah-King (Luke 19:40). With Sunday being Nisan 10, that meant Nisan 14 would land on Thursday. On a side note, this is interesting since Thursday is named after the planet Jupiter and accordingly it was known as the planet of the Messiah to the Jews--fitting for this day and also the day of his ascension into heaven forty days after the resurrection. So if Jesus died on Thursday do the three days and three nights count hold water? Jesus was on the cross from the 3rd hour (9 AM) until the 9th hour (3 PM) of the day. He was then placed in the tomb before the end of daylight since the High Sabbath of the Passover (Feast of Unleavened Bread) began at nightfall. The 15th of the month had become known as the Passover since it was the day that began the seven days of the Feast of Unleavened Bread. Work was also forbidden on this day and this is why the crucifixion would not have occurred on this day for this simple reason (Leviticus 23:7). The 14th had also become known as the Preparation Day, which the Gospels make clear was the day of the Crucifixion (John 19:20, Luke 23:54, Matthew 27:62, Mark 15:42). So Christ was buried at daylight on the 14th or Thursday. This qualifies as day one. Finishing the 3 days and 3 nights count means that Friday and Saturday were days 2 and 3. Thursday, Friday, and Saturday were nights 1, 2, and 3. Therefore, when Christ raises from the dead before daybreak Sunday morning he avoids the 4th day. Having Christ die on Friday means he only spends 2 nights in the grave. Some also try to put Christ on the cross on Wednesday, but that would give him 4 nights in the grave. Only Thursday coinciding with the 14th of Nisan works in the count of 3 days and 3 nights. The 14th on Thursday keeps the 10th on Palm Sunday, but then it also makes the 17th the day of Resurrection on the first day of the week. According to the story of the Flood, the Ark came to rest on this day (Genesis 8:4). The Exodus as well crossed the Red Sea on this day (Exodus 13:20 w/ 14:2). Therefore, it is fitting that these days land on this important anniversary day. With it being the first day of the week, it was also the Feast of Firstfruits and is a title that Paul calls Christ for good reason (1 Corinthians 15:20). This is all very important to establish the exactness of the Feasts and their timing. Jesus' sacrifice when the sun darkened at noon was exactly between the evenings on the 14th and corresponded to the time the Jews would also have sacrificed their lambs. It was no accident. The Second Coming of Christ will be no accident either. Rather, it is meticulously planned and laid out in the Feasts of the Lord. It has all been appointed and foretold. An good article to clarify has already been written by Jack Kelly. His article can be found here.