I had a bit of a left-field thought today. Have they intentionally screwed with the calendars to promote the idea of climate change, global politics, and to disconnect people from the sky, stars, and their natural environment.
I propose that the length of the true year is between 360-364 days in length. I think 364 is the most likely.
364 / 28 = 13
There are 28 days to the moons cycle, and this would break nicely into 13 lunar months. I think we are supposed to use the moon to tell dates and time alongside the stars, not the sun.
The sun is being used to throw everything off. It's part of their solar worshipping. They changed the calendar to be solar and adjusted to make it fit, but the sun was never supposed to be used for time keeping.
It is causing an extra 1.25 days every year to shift the actual seasons around. Very subtle, and not really enough to notice except over a lifetime - which would only be corroborated with at least 60+ years to truly notice as your idea of the months would be respective of your birth year.
This was likely done around the 1700's and would have coincided likely with the American/french revolution (revolve) and it pushed the ideas to the forefront of society.
Since this would result in approximately 100 years seasonal shifting, you could setup narratives for climate change (cooling and heating) because they are being told that December is supposed to be a certain way when in fact it's supposed to be tracked with 13 lunar months instead.
6-32 And you (Moses), command the children of Israel so that they shall guard the years in this number, three hundred and sixty-four days, and it will be a complete year. And no one shall corrupt its (appointed) time from its days or from its feasts because all (of the appointed times) will arrive in them according to their testimony, and they will not pass over a day, and they will not corrupt a feast. 33 But if they are transgressed, and they do not observe them according to his commandment, then they will corrupt all of their (fixed) times, and the years will be moved from within this (order), and they will transgress their ordinances. 34 And all of the sons of Israel will forget, and they will not find the way of the years. And they will forget the new moons and (appointed) times and sabbaths. And they will set awry all of the ordinances of the years. 35 For I know and henceforth I shall make you know—but not from my own heart, because the book is written before me and is ordained in the heavenly tablets of the division of days—lest they forget the feasts of the covenant and walk in the feasts of the gentiles, after their errors and after their ignorance.
36 And there will be those who will examine the moon diligently because it will corrupt the (appointed) times and it will advance from year to year ten days. 39 37 Therefore, the years will come to them as they corrupt and make a day of testimony reproach and a profane day a festival, and they will mix up everything, a holyday (as) profaned and a profane (one) for a holy day, because they will set awry the months and sabbaths and feasts and jubilees. 38 Therefore, I shall command you and I shall bear witness to you so that you may bear witness to them because after you have died your sons will be corrupted so that they will not make a year only three hundred and sixty-four days….