It is simply not true that the Scriptures
give detailed regulations for the calendar.
You are correct, there is no bible authority for figuring out the
first day of the first month from the new moon nearest the spring
equinox, or adding a leap year, and other details about it.
The oracles of God do not refer to Old Testament Scripture only.
Thing is God preserved His calendar through men, just as He did Old
Testament Scripture. God did not leave that responsibility to us—
He left that to the Jews! Genesis 1:14 God appointed both the sun and
moon “for signs, and for seasons, and for days, and years.”
luni-solar
God has a sacred calendar which keeps track of time. The Greek word
for oracles in Romans 3:1-2 simply means the words or utterance of God.
God also created a system of annual and weekly sabbaths to be observed.
Unless God has preserved His sacred calendar through the Jews, then
we do not know how to figure Passover or any of the holy days in the
year mentioned in the Hebrew bible. Did Jesus keep the Passover on
the wrong date? Did He mention the Hebrew calendar was off?
Even the Catholic church relied on the Hebrew calendar for a while.
Question then is Can we rely on the accuracy of the Hebrew
calendar? Is it God-inspired, or merely the work of carnal men?
God’s revelation concerning the heavenly bodies, including the
times and seasons, began with the earliest generations of men.
The Jewish historian Josephus account concerning the descendants
of Adam’s son Seth. He wrote, “Now this Seth … became a virtuous
man; and as he was himself of an excellent character, so did he
leave children behind him who imitated his virtues. … "They also
were the inventors of that peculiar sort of wisdom which is
concerned with the heavenly bodies, and their order.
And that their inventions might not be lost before they were
sufficiently known … they made two pillars; the one of brick,
the other of stone: They inscribed their discoveries on them
both” (Antiquities of the Jews, I, ii, 3). page 16 / 1.871
https://www.fulltextarchive.com/pdfs/The-Antiquities-of-the-Jews.pdf
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The Comprehensive Jewish Calendar
The Comprehensive Jewish Calendar
It was a closely guarded secret for thousands of years, known only
to the Jewish scribes and priests, rabbis and spiritual leaders.
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1 Chronicles 12:32, we find evidence that God revealed it and preserved
it through men: “And of the children of Issachar, which were men that
had understanding of the times, to know what Israel ought to do.”
According to the Targum, “the sons of Issachar … had understanding to
know the times, and were skilled in fixing the beginnings of years,
the commencement of months, and the intercalation of months and years …
that they might show Israel what to do; and their teachers were two
hundred chiefs of the Sanhedrin.”
God’s annual holy days was patterned after the two annual harvest seasons.
God instructed to observe His holy days on specific days of the month,
while at the same time, during appointed seasons of the year(Leviticus 23:4).
His spring festivals should be kept in the spring and the autumn festivals
in autumn. The Hebrew calendar does this, For without the calendar, it would
be impossible to fulfill correctly what is written in the Hebrew Bible about
hallowed annual times.
Romans 3: “What if some were unfaithful? Does their faithlessness nullify
the faithfulness of God?” Does that mean God would no longer preserve His
oracles through them? “God forbid: yea, let God be true, but every man a liar”
The scribes were responsible for the preservation of the Hebrew texts.
How do we know we have an accurate record of the Hebrew Scriptures? Faith
The Pharisees’ court, also in Moses’s seat, preserved the Hebrew calendar.
Christ said, “practice and observe whatever they tell you, but not what
they do; for they preach, but do not practice.
By faith we know that the leadership in the Jewish courts did preserve
the rules of the calendar God committed to them—even though they them-
selves have not wanted to follow those rules at all times.