Why isn't 24 solar terms full?

China's traditional culture stresses the doctrine of the mean, and taboo "over-fullness" and "over-fullness", and there are also some sayings that "extremes must be reversed" and "extremes must be reversed".

The reason why there is no whole season is that the characteristics of solar terms in autumn harvest season are quite distinct and it is not suitable to use the same name. Moreover, the name of the solar term Xiaoman also contains certain philosophical thoughts. Xiaoman also implies fullness without loss, fullness without profit, fullness without overflow, which conforms to the golden mean of China Confucianism. "Overfullness" and "Daman" are taboo words.