Well, you know these things, and like the ban on eating pork (pork doesn't walk in the sand, so you have to buy it from somewhere) and morals in general, are a bit opportunistic. There are 28 days in a lunar month, easy to divide by 2, impossible to divide by 3, so 4 is a convenient number. Nevertheless, God makes the sun and the stars and the moon, which go round every 28 days - the light before the stars, which could be well aligned with Einstein. When it's time to harvest, look at the moon, don't worry about the sun. And perhaps Jehovah of the Seven Armies was El in the beginning. A local deity who was certainly a harvest deity. The problem is difficult. The year doesn't agree with the months and the months don't agree with the days, hence the calendar.