The reason why the 24 solar terms have obvious regional color.

The reason why the 24 solar terms have obvious regional color is that the 24 solar terms are calculated according to the geographical position of China, mainly the orbital position of the earth's revolution. China is located in the east of Asia, where monsoon prevails. The temperature change in all parts of the country mainly decreases from southeast to northwest, which is just the opposite of the temperature change in the orbit of revolution.