In the 20 14 annual plan, why are some months broken down into weeks, some into four weeks, and some into five weeks?

Because, 1, 3, 5, 7, 8, 10, 12 have made great progress in recent months, and every month is 3 1 day; April, June, September,165438+1October, 30 days in advance, 29 days in advance; Only February has 28 days, so some months have four weeks and some months have five weeks. This is the yellow calendar calculated by our ancestors many years ago. We should have everything.