Special phenomena and climate characteristics of solar terms in autumn equinox

The autumnal equinox solar terms finally arrived unhurriedly, and the autumnal equinox marked that we really entered autumn. The following are the special phenomena and climate characteristics of the autumnal equinox solar terms that I have compiled. Welcome to read and share for reference, I hope it will help you.

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What's so particular about the autumnal equinox?

General knowledge of autumnal equinox and solar terms

What does the autumnal equinox mean?

There are 10 poems about the autumnal equinox.

What does the autumnal equinox mean?

Interpretation of autumnal equinox: One of the 24 solar terms of the lunar calendar means that it officially enters autumn.

China's ancient book "Spring and Autumn Stories, Yin and Yang in and out" said: "The autumn equinox, Yin and Yang are also half-phase, so it is cold and hot day and night." The autumnal equinox means "half" "Autumnal Equinox" refers to the method of dividing the seasons in ancient China, with beginning of spring, Changxia, beginning of autumn and beginning of winter as the four seasons. The autumnal equinox lives in autumn for 90 days and divides the autumn equally.

The meaning of the "twenty-four solar terms" in the autumnal equinox: "In the middle of August ... see the vernal equinox." "Divide" means to divide day and night equally. Like the vernal equinox, the sun shines directly at the equator of the earth, and day and night are equal. Since then, the position of direct sunlight has moved south, and the days in the northern hemisphere have gradually shortened, the nights have become longer, and the temperature has dropped, which is of universal significance throughout the country.

After the autumnal equinox, the days are getting shorter and shorter in the northern hemisphere, and the nights are getting longer and longer in the southern hemisphere. From the winter solstice, the day becomes longer and longer, but from the vernal equinox, the day is longer than the night, from the summer solstice, the day becomes shorter and shorter, but from the autumnal equinox, the day is shorter than the night.

What special phenomenon will appear in the autumnal equinox?

The north and south poles share the same day.

On the day of the autumnal equinox, the sun shines directly on the equator, and both poles can see the sun at the same time and share the same day.

Height is as long as shadow.

On the 45-degree north latitude line, the height of the building can be measured without climbing, because it seems that they have already discussed with their own shadows. The height of this day is as long as the shadow, so knowing the length of the shadow will also know the height of the building.

Can't find my own shadow

Because the direct point of the sun shines on the equator impartially, when you come to the equator, you will find that nothing can find your own shadow.

What's the change in the weather at the autumnal equinox? It is not hot after the autumnal equinox.

In the autumn equinox, most parts of China have entered a cool autumn. The cold air from the south meets the gradually decaying warm and humid air, which causes repeated precipitation and the temperature drops again and again. As people often say, it's time for "an autumn rain and a cold", but the daily precipitation after the autumnal equinox will not be great.

At this time, the field farming in the south and the north is different. In northern China, there is an agricultural proverb that says: "The white dew is early, the cold dew is late, and it is the right time to plant wheat in the autumn equinox." Proverbs clearly stipulate the sowing time of winter wheat in this area; And "White clouds come in autumn equinox, good songs and good rice seeds are everywhere" reflects the planting time of rice in Jiangnan area. In addition, the working people's taboos on the autumnal equinox solar terms are also summarized as proverbs, such as "The autumnal equinox is only afraid of lightning, how much is it?"

Climatic characteristics of autumnal equinox

1, and the average daily temperature in autumn is lower than 22℃

At the autumnal equinox, the Yangtze River basin and its vast northern area have entered autumn, and the daily average temperature has dropped below 22℃. The cold air mass in the north began to have some influence. In most areas, the rainy season has just ended, with a cool breeze blowing gently, the sky is high and the clouds are light in Wan Liqing, the air is crisp in autumn, the sweet-scented osmanthus is fragrant, the crab is fat and the chrysanthemum is yellow, and the autumn equinox is a beautiful and pleasant season.

2, the ground heat loss is more, and the temperature drops rapidly.

After the autumnal equinox, the direct sunlight moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, but the ground lost more heat and the temperature dropped significantly. Agricultural proverbs say: "An autumn rain is a cold", "The white dew is divided into autumn nights, and one night is cold". "In August, the wild goose gate opens, and the foot of the wild goose is frosty." It is not surprising that the temperature in Northeast China drops early and frost appears at the autumnal equinox.

3. Cold air heading south

On the day of the autumnal equinox, the sun is located at longitude 180 degrees, and the sunlight is almost direct to the equator, and day and night are almost equal. At this time, the waiting temperature in the southern region has generally dropped below 22℃, and it has entered a cool autumn. "An autumn rain and a cold". The cold air from the south meets the warm and humid air that gradually decays, resulting in repeated rainfall and the temperature dropping again and again.

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