The 24 solar terms are a system of time knowledge and practice formed by the Chinese through observing the annual movement of the sun.
The "24 Solar Terms" is a knowledge system and social practice formed by the Chinese people through observing the annual movement of the sun and recognizing the changing laws of seasons, climate, phenology, etc. in a year. The ancient Chinese divided the annual movement trajectory of the sun into 24 equal parts, each of which is a "solar term", collectively known as the "24 Solar Terms". Specifically include: Beginning of Spring, Rain Water, Waking of Insects, Spring Equinox, Tomb-Sweeping Day, Grain Rain, Beginning of Summer, Grain Full, Grain in Ear, Summer Solstice, Minor Heat, Major Heat, Beginning of Autumn, End of Heat, White Dew, Autumnal Equinox, Cold Dew, Frost Descent, Beginning of Winter, Minor Snow, Major Snow, Winter Solstice, Minor Cold, Major Cold. The "24 Solar Terms" guide traditional agricultural production and daily life, and are an important part of the traditional Chinese calendar system and its related practical activities. The "24 Solar Terms" were formed in the Yellow River Basin of China. Based on the observation of the temporal changes of astronomical phenomena, temperature, precipitation and phenology in the region, it was gradually adopted by all parts of the country as a time guide for production and life in agricultural society and shared by multiple ethnic groups. As a unique time knowledge system of the Chinese people, this heritage project has a profound impact on people's way of thinking and behavioral norms, and is an important carrier of the Chinese nation's cultural identity.