Knowledge about beginning of autumn.

Beginning of autumn is an important solar term among the 24 solar terms, which marks the turning point of the season and represents the beginning of autumn.

1. Overview of solar terms:

Beginning of autumn is the13rd solar term in the twenty-four solar terms of the lunar calendar, which usually occurs on August 7th or 8th of the Gregorian calendar. The specific date is calculated according to the longitude 135 of reaching the sun from summer to the future every year. Beginning of autumn marks that the spirit of the sun begins to fade, the weather gradually turns cold, and the characteristics of autumn begin to appear.

2. The longitude of the sun135;

Beginning of autumn determines solar terms according to the position of the ecliptic. When the sun reaches longitude 135, it means that beginning of autumn officially begins. At this time, the position of direct sunlight on the earth moved from the northern hemisphere to the southern hemisphere, and the sunshine in the northern hemisphere gradually decreased, corresponding to the gradual decline of temperature.

3. Natural phenomena:

In early autumn, the temperature in most areas began to drop obviously, and there were more and more clouds in the sky. At this time, tropical cyclone activities are frequent, which is easy to cause typhoon, rainstorm and other weather phenomena. As far as farmland is concerned, beginning of autumn is a critical period before the harvest of crops.

4. Autumn is getting stronger:

After beginning of autumn, autumn became stronger, the weather turned cold, and the temperature difference between day and night increased obviously. Plants began to prepare for dormancy, leaves gradually turned yellow and red, and most fruits began to mature. People can feel the pleasant climate in autumn and the joy of harvest.

5. People's customs and activities:

Beginning of autumn is an important node in the traditional festivals in China, and people will hold various celebrations and sacrifices on this day. At this time, people will eat certain foods, such as beginning of autumn cakes and persimmons, which symbolize good luck and good harvest. At the same time, after beginning of autumn, people will begin to make some preparations for autumn and winter, such as curing food and storing materials for winter.

Summary:

As an important solar term among the 24 solar terms, beginning of autumn marks the turning point of the season and represents the beginning of autumn. It is not only an important node of solar movement and natural changes, but also closely related to people's lives and customs. After beginning of autumn, autumn is getting stronger, and people can enjoy the pleasant climate, the joy of harvest and traditional festivals and customs.