2025-08-06 00:00:00 The twenty-four solar terms were originally formulated based on the rotation direction of the handles of the Big Dipper. During the period of Emperor Wu of the Western Han Dynasty, the twenty-four solar terms were included in the "Taichu Calendar" as a supplement to the calendar to guide farming. Tugui was used to measure the sun's shadow in the Yellow River Basin to determine the day with the longest shadow and the shortest day as the winter solstice. The winter solstice was regarded as the "two days". The starting point of the "Fourteen Solar Terms" is to divide the period between the winter solstice and the next winter solstice into 24 equal parts. The time between each "solar term" is equal, and the interval between each solar term is 15 days. In the Yellow River Basin, by observing changes in celestial phenomena, temperature, rainfall and snowfall, and animals and plants, a set of time guidelines suitable for life and production in farming society were derived, which were gradually adopted throughout China. People arrange traditional farming, festivals, folk activities, and the daily necessities of each family according to the twenty-four solar terms, which profoundly affects the Chinese people and is an important carrier of the cultural identity of the Chinese nation. The twenty-four solar terms play an important role in traditional Chinese culture. They have had a profound impact on the Chinese people's clothing, food, housing and transportation for thousands of years, and are full of Chinese poetry and painting. It is an important part of the long history and culture of the Chinese nation. In 2016, the Twenty-Four Solar Terms were officially included in the UNESCO Representative List of Intangible Cultural Heritage of Humanity.