Thanks for your most thorough review.
One more thing to ponder may be reflection of each of our’s own subsequent birthday’s:
Consider how cost of insurance often increases on annual life insurance premiums as the policyholder ages. For example, if one’s birthday is January 1, 1960, they turned 60 years old this past New Year’s Day 2020. The increase in pricing goes into effect for the underlying cost of insurance for the next 12 consecutive months.
However, technically for those whose birthday is that same exact day you are also actually starting your 61st year of life (from outside the womb). Yet the simple math, precisely at 12 midnight you are for at least insurance pricing purposes often considered a full year younger of age 60; that being your “attained” age.
Perhaps choose to apply basic arithmetic here too?
After all 6 + 6 = 12 - back then and still applies today.
And again, science continues to also show spring equinox in Northern Hemisphere has precisely 12 hours of daylight. And no empirical evidence to the contrary of an evolution/change today from back then in sunlight patterns either, i…e. thus on the particular day Christ allegedly died the daylight ended and darkness started at precisely 6PM.