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>> “the evening AND morning of that day, prior to the sighting, IS the last day of the month.” <<
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Not sure what you’re saying there, but....
The evening (at the sighting) and the morning following are the first day of the month.
Evening begins every Biblical day.
This is why the New Testament says that they “came together on the first day of the week” when they met in the evening for Havdalah at the close of the Sabbath.
By the Roman calendar, it was Saturday evening, but by the Biblical calendar it was the first day of the week.
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It can be somewhat confusing. I'm attempting to define the "first day" (the very first day as described in Genesis. Seems I may just be just adding to the confusion though. :-)
As described in the book of Genesis, there was only dark in the beginning, therefore there wasn't a evening (i.e. the evening and morning were the first day) to begin counting the first day from per say . However every "day" (the actual time of light) has both a evening and a morning, likewise the very first day did as well.
The fact is the "evening and morning" were the n day works both ways, whether describing light (day) or a 24 hour day when time is kept as the Almighty intended.
So it occurred to me that this may be what is confusing to delchiante. I was trying to make a distinction between the actual "first day" and the 24 hour time period called a day that followed after the "first day".
The 24 hour day indeed begins at sundown in scriture and in Israel even today as it well should IMO, and as it should in the west, again IMO, if we actually followed scripture.
Apologies for the confusion. I enjoy immensely understanding and sharing the fundamentals of our Hebrew roots, when discussion can take place in a cordial manner though sometimes confusion and disagreement reign. ;-)