Phenological characteristics of the autumnal equinox, characteristics of the autumnal equinox Charac

In ancient China, the autumn equinox was divided into three phases: "one is the beginning of the thunder; secondly, stinging insect blank households; Three wait for the water to start drying". The ancients believed that thunder was made because of the strong yang energy, and after the autumn equinox, the yin energy began to flourish, so it no longer thundered.

The word "billet" in the second candidate means fine soil, that is, due to the cold weather, the insects that live in the cave begin to hide in the human cave, and the hole is sealed with fine soil to prevent the cold from entering. "The water begins to dry up" means that the rainfall begins to decrease at this time, and because the weather is dry and the water vapor evaporates quickly, the amount of water in lakes and rivers decreases, and some swamps and puddles dry up.

At the time of the autumn equinox, most parts of our country have entered the cool autumn, and the cold air from the south meets the warm and humid air that gradually decays, producing precipitation again and again, and the temperature also drops again and again. As is often said, it is time for "one autumn rain and one cold", but the daily precipitation after the autumn equinox will not be very large. At this time, the fields in the north and south were different.

In North China, there is an agricultural proverb that says: "The white dew is early, the cold dew is late, and the autumn equinox is the right time to plant wheat." "The proverb clearly states when the winter wheat will be sown in the region; And "the autumn equinox weather is full of white clouds, and there are good songs and good rice cultivation everywhere" reflects the time of sowing rice in the Jiangnan area.

In addition, the taboo of the working people on the autumn equinox solar term is also summarized into proverbs, such as "the autumn equinox is only afraid of thunder and lightning, how expensive is the price of rice".

During this period, many parts of the country began to enter periods of low precipitation. After the autumn equinox, the number of rainy days and rainfall in most parts of China, including Jiangnan and South China (except for tropical cyclones with heavy rainfall), have entered a period of reduced precipitation, and the water level of rivers and lakes has begun to decline, and some seasonal rivers and lakes will even gradually dry up. During this period, there may be individual tropical cyclones, but the impact location is southerly, mostly affecting the coast of South China and Hainan Island, when the typhoon in addition to the wind disaster, the rain brought by the typhoon is often beneficial to the local soil moisture conservation, because these areas have turned into the dry season after October.

1. The autumn equinox, the bucket finger, is the first round of the "24 solar terms" type 16 solar terms. The festival falls on September 22-24 in the Gregorian calendar, when the sun reaches 180 degrees of ecliptic longitude. On the day of the autumnal equinox, the day and night are equal, and the longer the night, the shorter the day.

After the autumnal equinox, the direct point of the sun continues to move from the equator to the southern hemisphere, and the days and nights begin to be shorter and longer in the northern hemisphere, that is, the days begin to be shorter than the nights in a day. The Southern Hemisphere is the opposite.

2. At the autumn equinox, the day and night are evenly divided in most parts of the earth, each 12 hours; Near the North and South Poles, the Sun can be observed on the horizon all day. After the autumnal equinox, the days are shorter and the nights are longer in the northern hemisphere, and the days are longer and the nights are shorter in the southern hemisphere. The "fen" in "autumn equinox" means "half".

"Equinox" shows the meaning of day and night equinox, the same as the spring equinox, the sun directly hits the earth's equator on this day, and Tong Tang guesses the equinox of day and night.

3. Weather: During the autumn equinox, most parts of China have entered the cool autumn, and the cold air from the south meets the warm and humid air that gradually decays, producing precipitation again and again, and the temperature also drops again and again. As is often said, it is time for "one autumn rain and one cold", but the daily precipitation after the autumn equinox will not be very large.

At this time, the fields in the north and south were different.