What are the rules of the time of the 24 solar terms?

The time patterns in the 24 solar terms are as follows:

1, there will be a festival or a breath every fifteen days. For example, on February 3, 20 17 in beginning of spring, it rained on February 3 15 days later. So 15 day is a festival, or a breath, which is a fixed law. This is related to the changing law of the sun shining on the equator. Generally speaking, the sun starts from the vernal equinox, and every line 15 degrees changes at an angle. Why do you say from the vernal equinox? Because at the vernal equinox, the longitude of the Yellow River is just 0 degrees.

2. So, for example, in "Special Gate", there are 72 combinations, including 72 innings, 72 dragons, 72 waits, etc. This is how they were introduced. Knowing this, you will know the change of luck. From a small time point, it is a small change of 15 days, a moderate change of one month, and then a big change of one year. This is also the law.