Twenty-four solar terms
Because China is located in the northern hemisphere, the ancient Chinese people used the dipper's handle to point to determine the time. The dipper's handle circled southeast and northwest in a cycle. The trajectory of the dipper's handle just like the shape of a Tai Chi, and it began again and again. The current method of dividing 24 solar terms is more precise than before. The ecliptic of the earth is divided into 24 points, totaling 360 degrees, with an average of 15 degrees for each solar term. The earth's revolution happens to be one year, that is, a cycle.
Twenty-four solar terms are not only the time criterion of past dynasties, but also the guideline to guide agricultural production. In daily life, people predict the cold, warm, snow and rain. Twenty-four solar terms accurately reflect seasonal changes and are used to guide agricultural activities, affecting the food, clothing, housing and transportation of millions of households. The 24 solar terms scientifically reveal the laws of astronomical and meteorological changes. Twenty-four solar terms combine astronomy, farming, phenology and folklore skillfully, and derive a large number of seasonal cultures related to them, and become an important part of the traditional culture of the Chinese nation.