Understand Zi Ping's eight characters. Time problem

I think, first of all, the change of qi is the change of the universe, and the change of climate is gradual. Heavenly stems and earthly branches is still not accurate enough to express his change.

Secondly, one hour is not necessarily two hours. According to the ancient way of timing. In summer, one hour in a day is three hours or more. Winter is the opposite.

Third, the time before, during and after the birth of the eight characters (dividing an hour into three parts) is different, which is explained in some books. (Not verified)