Dear Doves,

Leviticus 23:5-8 (Passover and the Feast of Unleavened Bread)
(5) "The Lord's Passover begins at twilight on the fourteenth of the first month". (Passover ends at sunset on the 14th and the Feast of Unleavened Bread begins on the same sunset.)
(6) "On the fifteenth day of that month the Lord's Feast of Unleavened Bread begins; for seven days you must eat bread made without yeast. On the first day hold a sacred assembly and do no regular work. For seven days present an offering made to the Lord by fire."

Leviticus 23:10 (Firstfruits)
"When you enter the land I am going to give you, and you reap its harvest, bring to the priest a sheaf of the first grain you harvest. He is to wave the sheaf before the Lord so it will be accepted on your behalf; the priest is to wave it on the DAY AFTER THE SABBATH (which is Sunday/Firstfruits - the first day of the week).

Mark 16:9
"Now when HE ROSE EARLY ON THE FIRST DAY OF THE WEEK, He appeared first to Mary Magdalene.." (which is Firstfruits/Sunday)

If the Passover/Crucifixion was on Wednesday (14th) then the following Sunday, "the first day of the week", was the 'fourth day -18th' following. If the Passover/Crucifixion was on Thursday (14th) then the following Sunday, "the first day of the week", was the 'third day -17th' following.

In either case, "He rose early on the first day of the week" which is Sunday/Firstfruits during the Feast of Unleavened Bread which is the ONLY Sunday during the seven-day Feast of Unleavened Bread and is the day the omer-count begins.  

Come Lord Jesus!

Bruce Warner