The Passover holiday occurs on the 14th day of Nisan at evening which is the beginning of the 15th day by the Jewish way of reckoning the day from sun down to sun down. The Hebrew month of NISAN is the first month of the biblical year, which the Bible also refers to as the month of AVIV (Deuteronomy 16:1) and means BLOSSOMING. “In the first month, on the fourteenth day of the month at dusk, is the Lord’s Passover. And on the fifteenth day of the same month is the Feast of Unleavened Bread unto the Lord” (Leviticus 23:5). The Passover night and the Feast of Unleavened Bread are collectively known as Passover. By arrangement of the calendar — so all the other holiday observances do not interfere with the Shabbat, the first day of Passover, the 15th of Nisan, cannot fall on a Monday, Wednesday, or Friday. The Bible ordains seven days for the celebration of the Feast of Unleavened Bread holiday. “Then on the fifteenth day of the same month there is the Feast of Unleavened Bread to the LORD; for seven days you shall eat unleavened bread” (Leviticus 23:6). Custom and tradition have added an eighth day.