1, 24 solar terms reflects the annual movement of the sun. Every solar term starts from beginning of spring, Changchun, beginning of autumn and beginning of winter, which is determined according to the position of the sun on the ecliptic. The ecliptic is the earth's orbit around the sun, and these four solar terms are actually signs of the sun's position on the ecliptic.
2. Twenty-four solar terms also reflect the thought of Yin-Yang and Five Elements in China's ancient astronomy. Yin-Yang and Five Elements are the basic concepts in China's ancient philosophy, which are used to explain various phenomena in nature. The twenty-four solar terms are also divided into twelve solar terms and twelve middle solar terms, which reflect twelve information hexagrams, twelve yin-yang hexagrams and five elements hexagrams. These divination images show the changes of Yin and Yang and the generation and restriction of the five elements.
3. The names of the 24 solar terms also reflect some important concepts in ancient astronomy in China. For example, the vernal equinox, the autumnal equinox, the winter solstice and the summer solstice are four nodes that divide the day and night equally, reflecting the influence of the earth's rotation and revolution on the climate. Solar terms such as rain, shock and Qingming reflect the changes of phenology and weather.
4. Twenty-four solar terms also reflect the calendar system in ancient astronomy in China. In ancient China, there were mainly two calendars: Yin and Yang calendars and twenty-four solar terms. Twenty-four solar terms are an accurate solar calendar, and the specific time of each solar term is determined by the position of the sun. This calendar system played an important guiding role in ancient agricultural production.
Section 24 Related knowledge of gas
1, beginning of spring: It marks the beginning of spring, everything recovers, the rain gradually increases, and the temperature gradually rises. Beginning of spring is the first solar term after the Lunar New Year in China, and it is also the beginning of spring. Rain: refers to the beginning and gradual increase of rain, which is beneficial to the growth of crops. Solar terms usually come after beginning of spring, marking the end of winter and the arrival of spring.
2. Surprise: Surprise means that insects are beginning to move, and spring has arrived. This solar term marks the further deepening of spring, with the temperature rising gradually and the weather getting warmer. Equinox: Equinox means equal division of day and night, which is the middle stage of spring. After this solar term, the days gradually become longer and the temperature gradually rises. The vernal equinox is also an important period for crop growth in spring.
3. Qingming: Qingming is a festival to worship ancestors and a time to sweep graves. This solar term marks the end of spring and the beginning of summer, and the weather becomes warm and humid. Grain Rain: Grain Rain said that abundant rain is good for the growth of crops. This solar term marks the end of spring ploughing and the beginning of Xia Geng.
4. Long summer: Long summer marks the beginning of summer. The temperature rises gradually and the weather gets hot. After the long summer, crops grow faster and need more water and nutrients. Xiaoman: Xiaoman means that summer crops begin to mature, but they are not yet fully mature. After this solar term, crops begin to harvest in summer, which is the harvest season.
5. Miscanthus: Miscanthus indicates that summer crops are mature and can be harvested. After this solar term, summer crops need more protection and management to avoid being attacked by pests and diseases. Miscanthus means that food crops with awns can be planted. At this time, the temperature rises obviously, with abundant rainfall and high air humidity, which is suitable for planting food crops such as late rice.