Fascinating, this requires further investigation.
As I understand the premise of this calendation there were three back to back months mentioned in the Bible....
....Within the time-hack of the Exodus from Egypt when Moses led out the Children.
....Where the Sabbath day was on the 8th, 15th, 22nd and 29 days of each month.
This is impossible to duplicate on a Gregorian calendar or any other calendar where the 7 day weekly cycle....
...Is perpetual and continuous.
The reasoning is as follows.
The C.O.I. were told to kill the Passover lamb on the 14th day of the month...
....& to remain in their houses until the morning.
....Exodus
12.
"
And the LORD spake unto Moses and Aaron in the land of Egypt saying, This month shall be unto you the beginning of months: it shall be the first month of the year to you.
Exodus 12,1
God said this to Moses while the Children were still in Eqypt. If you have a Strong's please look up the Hebrew word for "month", it's H2320 (Chodesh) which the only meaning is "New Moon" or by implication a month or monthly "new moon".
Now it starts to get interesting.
"
And Moses wrote their goings out according to their journeys by the commandment of the LORD: and these are their journeys according to their goings out. And they departed from Rameses in the first month, on the fifteenth day of the first month; on the morrow after the passover the children of Israel went out with an high hand in the sight of all the Egyptians.
Numbers 33, 1-3
Now, counting from the "New Moon", Passover the 14th is ALWAYS on the 6th "day" of the week. In the above Scripture the Children of Israel left Eqypt "on the morrow" or the next day
after Passover.
Six days shall work be done: but the seventh day is the sabbath of rest, an holy convocation; ye shall do no work therein: it is the sabbath of the LORD in all your dwellings. These are the feasts of the LORD, even holy convocations, which ye shall proclaim in their seasons. In the fourteenth day of the first month at even is the LORD's passover. And on the fifteenth day of the same month is the feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread. In the first day ye shall have an holy convocation: ye shall do no servile work therein. But ye shall offer an offering made by fire unto the LORD seven days: in the seventhLev 23, 1-8
Here is the simple math,
New Moon Day (
1), Day 2, Day 3, Day 4, Day 5, Day 6, Day 7, Day
8, Day 9, Day 10, Day 11, Day 12, Day 13, Day 14 (Passover), Day 15 (
Sabbath Day)
Day 1 (New Moon) and Day 14 (Passover) have been identified. We know from Deut 16,1 that God brought the Children out of Egypt "
by night" the day after the Passover. We know that the New Moon day is the first day of the first month of the first year because God commanded the Hebrews to keep the Passover Lamb up to the 14th day of the first month then to kill it.
Here is what the Bible says about the setting of "time".
The high hills are a refuge for the wild goats; and the rocks for the conies. He appointed the moon for seasons: the sun knoweth his going down.
Ps 104,18
If you go back and look at the "simple math" you will see that the 15th day, by default, is the Sabbath. Counting back 7 days identifies the 8th day as also a Sabbath. Day 1 can't be the Sabbath because it's the first day, of the first month of the first year and there is
never a time where the New Moon day is the Sabbath, it's impossible on this type of calendar. Counting forward from the 15th day we can identify the 22nd and 29th day as Sabbath days as well. This is the first Biblical month. The second month is laid out identical.
We know that the New Moon day is not counted as being one of or part of the 6 working days because of
Eze 46, 1
Thus saith the Lord GOD; The gate of the inner court that looketh toward the east shall be shut the six working days; but on the sabbath it shall be opened, and in the day of the new moon it shall be opened.
On the
15th Day of the Second month of the Exodus from Egypt the Children complained to Moses. Notice what happens. God tells Moses on the 15th Day that He will rain bread from heaven and test the Children to see if they will walk in His law or not.
On
Day 15 God instructs Moses what to instruct the Children. If you read Exodus 16 you will see on the evening of the "15th day
of the month" God caused quail to blow into the camp of the Children of Israel and the next morning manna started to fall. Day 15 = The Sabbath, plus 16th day (1st day of manna), 17th day (2nd day of Manna), 18th day (3rd day of Manna), 19th day (4th day of Manna), 20th day (5th day of manna), 21st day (6th day of Manna) whereas the Children are to gather twice as much manna because on the 22 day there will be no manna because that day is the Sabbath day. The math works out the same way as it did from the Exodus of Egypt with the Sabbath being on the 8th, 15th, 22nd and 29th day
from the New Moon. That's two months wereas the Sabbaths were on the identical days of the same Lunar Calendar.
The third month appears to work out the "same way" and as no one can duplicate two months back to back...
...With the Sabbath day falling on the identical days such as above.
...This looks to close things out pretty solidly.
In any even, if anyone was interested THAT is the reasoning behind that type of calendation...
...Most important for SDA's is it allows for a Passover 6th day of the week death on the cross for Christ.
...In 31 A.D. - which is required to validate the 2300 / year SDA prophetic schema.