Why did Zhuge Liang invent the twenty-four solar terms?

The twenty-four solar terms were not invented by Zhuge Liang, but formulated by the ancients according to the ecliptic plane, reflecting the influence of the sun on the earth and belonging to the solar calendar category. It is an important part of the long history and culture of the Chinese nation and embodies the historical and cultural essence of Chinese civilization. Twenty-four solar terms were established in ancient times, and were absorbed into taichu calendar law in Han Dynasty as a supplementary calendar to guide farming. Twenty-four solar terms are not only the time criterion promulgated by successive governments, but also the compass to guide agricultural production and to predict cold, warm, snow and rainy days in people's daily life.