Traditional Culture Encyclopedia - The 24 Solar Terms - Is September early autumn?

Is September early autumn?

September is the early autumn of autumn. Autumn means one of the four seasons: spring, summer, autumn and winter. Traditionally, "beginning of autumn" with 24 solar terms is the starting point of autumn. Entering autumn means that rainfall and humidity tend to decrease or decrease, and everything in nature begins to mature from lush. According to the average temperature, there are four seasons in a year. The index is that the period when the average temperature is lower than 10℃ is winter, the period when the average temperature is higher than 22℃ is summer, and the period when 10~22℃ is spring and autumn respectively. There are six solar terms in autumn, namely beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew and First Frost.

Four seasons:

Refers to the four seasons that alternate in a year, namely, spring, summer, autumn and winter, and each season has three months. All the year round is formed because the earth revolves around the sun. Because of the existence of the ecliptic angle, the direct point of the sun moves back and forth between the north and south latitudes of the earth, which changes every year, resulting in the seasonal changes of the height of the sun at noon, the length of day and night, and the seasonal changes of the solar energy obtained in various places, thus forming the replacement of the four seasons. In ancient times, according to bucket handle's direction, the four seasons alternated and the Big Dipper rotated circularly, which was closely related to the change of seasons. At present, the division of seasons is usually determined by the position of the earth in the orbit around the sun. The rotation of the four seasons reflects the changing laws of phenology and climate such as spring, long summer, autumn harvest and winter storage. The southern region of China (low latitude region) is rich in precipitation, abundant in sunshine, high in humidity, small in temperature difference between winter and summer, and the climatic factors such as sunshine and precipitation change obviously with the seasons. The northern region (mid-latitude region) is characterized by less precipitation, dryness, and large temperature difference between winter and summer. When the season changes, the obvious change of climate factors is temperature.