Climatic characteristics of autumn wind solar terms

The climate characteristics of autumn wind solar terms are: the temperature gradually decreases, the weather is changeable, the temperature difference between day and night is large, and the climate is dry.

1, the temperature gradually drops: after the autumn wind solar term, the direct point of the sun gradually moves southward, and the daytime time in the northern hemisphere shortens and the nighttime time increases, resulting in the temperature gradually drops. Especially in the northern region, the temperature difference between morning and evening is large, so it is necessary to keep warm.

2. The weather is changeable: the autumn wind and solar terms are in the season transition period, and the weather changes frequently. Sometimes it will be rainy and sometimes it will be sunny and dry. Therefore, it is necessary to adjust clothes and travel plans in time according to the weather conditions.

3. Large temperature difference between day and night: During the autumn wind and solar terms, the temperature difference between day and night is large. During the day, due to the role of solar radiation, the temperature is higher; At night, the temperature is lower because of the surface heat dissipation. This kind of temperature difference between day and night is large, so it is necessary to pay attention to prevent diseases such as colds.

4. Dry climate: After the autumn wind solar terms, the humidity in the air gradually decreases and the climate becomes dry. This dry climate can easily lead to problems such as dry skin and sore throat, so pay attention to moisturizing and hydrating.

These characteristics require us to pay attention to adjusting our clothes, travel plans and lifestyle to adapt to the changes of seasons.

The origin of autumn wind solar terms can be explained from the following aspects:

1, astronomical factors: the solar terms in autumn wind are determined according to astronomical factors. On September 22nd or 23rd every year, when the sun reaches longitude 180 degrees, it is an autumn wind solar term. At this time, the day time in the northern hemisphere is shortened, the night time is increased, the direct point of the sun gradually moves south, and the temperature gradually drops.

2. Climatic characteristics: The names of autumn wind solar terms reflect the climatic characteristics of this period. In ancient times, people divided the four seasons into four periods: cold, warm, warm and cool, and each period was divided into six solar terms. The autumn wind solar term is the first solar term in the cool season, which means that the autumn has passed halfway and the climate is gradually changing from hot to cold.

3. Phenological phenomena: The arrival of autumn wind solar terms is also related to some phenological phenomena. At this time, some plants and animals began to prepare for the coming winter. For example, some trees begin to shed leaves, and some animals begin to store food or look for warm shelter.

4. Agricultural production: The arrival of autumn wind solar terms also has a certain impact on agricultural production. At this time, some summer crops have matured and harvested, and some autumn crops have begun to enter the critical growth period. Farmers need to arrange their farming activities reasonably according to climate change and crop growth.

The origin of autumn wind solar terms is based on the comprehensive consideration of astronomical factors, climate characteristics, phenology and agricultural production. This solar term reflects the adaptation and adjustment of nature and human society to seasonal changes.