The ancients founded the country with policy as the sky, and used the technique of checking the hanging image to show the people's intention of obeying the law.

The ancients founded the country with policy as the sky, inspected the suspension of operation, and showed the people to abide by the law, meaning 24 solar terms. The twenty-four solar terms were originally the daily culture of mass production and life. The ancients founded the country, and the urgency of measuring the sky ... observed the operation of hanging images and showed that people obeyed the law. Twenty-four solar terms are a knowledge system and social practice formed by the ancients by observing the movement of the sun for a year and understanding the changing laws of the four seasons, climate and phenology in a year. Since Qin and Han Dynasties, it has been playing a very important role in the national economy and people's livelihood because it accurately reflects the changes of seasons, climate and phenology in a year and their relationships. Twenty-four solar terms are not only the time standard of national administration, but also the compass of agricultural production and the vane of daily life. The idea of harmonious coexistence between man and nature, including respecting nature, imitating nature, caring for nature, using nature and helping nature, is the essence of China culture, which highlights its universal significance and enjoyment value at a time when the global ecological environment is deteriorating and sustainable development is facing crisis. All along, the 24 solar terms have been adopted all over the country and loved by many ethnic groups. In the long-term practice of production and life, the people of the whole country not only personally inherited the cosmology and core values of Chinese civilization, but also creatively used the 24 solar terms according to local conditions, forming a rich material culture and spiritual culture-both national festivals, production ceremonies and customs, as well as proverbs, ballads, legends, poems, handicrafts, calligraphy and painting and other literary works.