What is the autumnal equinox and what are its characteristics?

What is the autumnal equinox and what are its characteristics?

The autumnal equinox is from September 22nd to 24th in the Gregorian calendar. Strictly speaking, the weather in the south really enters autumn from the autumnal equinox. After the autumnal equinox, the northern hemisphere began to have shorter days and longer nights, while the southern hemisphere was just the opposite. The sixteenth solar term in the twenty-four solar terms of the lunar calendar is in the autumn equinox. China's ancient book "Spring and Autumn Stories Yin and Yang in and out" said: "In the autumn equinox, Yin and Yang are also half-phase, so day and night are cold and summer." The autumnal equinox means "half"

"Equinox" has two meanings:

First, the time between day and night is equal, with long days and short nights, and short days and long nights. On this day, the sun reaches longitude 180 degrees and points directly at the equator of the earth, so the 24 hours of this day are divided equally, each being 12 hours; There is no extreme day and night phenomenon in the world.

Second, the climate changed from hot to cold. According to the division of seasons in ancient China, which started with beginning of spring, Changxia, beginning of autumn and beginning of winter, the autumnal equinox is divided into 90 days in autumn and divided equally in autumn. For example, Heshui Zuo's poem says, "Summer retreats and autumn turns sunny and cool, and the sun and the moon are the same length." It means "it gets cold in autumn". The climate in the south began to decline from this solar term. First, the sun reaches 180 degrees on this day, pointing directly at the equator of the earth, so a day is divided into 24 hours, each 12 hours; There is no extreme day and night phenomenon in the world. After the autumnal equinox, the polar night range near the North Pole and the polar sun range near the South Pole gradually expanded.

Characteristics of 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?"

"beginning of autumn" is the beginning of autumn and ends with "the first frost", and the "vernal equinox" is just half of the 90 days from beginning of autumn to the first frost. 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. It is also an important solar term in agricultural production. After the autumnal equinox, the direct sunlight moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, while the ground lost more heat and the temperature dropped significantly.

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, which leads to repeated rainfall and the temperature drops again and again. In the northern part of the northwest plateau, the daily minimum temperature has dropped below 0℃, and you can already see the magnificent snow scene flying all over the sky and the earth wrapped in silver. It is rainy and humid in autumn in the south and Liangshan Prefecture, which has great influence on autumn harvest, autumn ploughing and autumn planting.

Recommendation of autumn equinox health care recipes

1, autumn wind is high and dry, nourishing skin-Ginkgo, Chrysanthemum and Sydney Drink

【 Materials 】 20 grams of ginkgo, 4 white chrysanthemums, 3 Sydney, 250-350 ml of fresh milk or light milk, and appropriate amount of honey.

[Cooking] Peel ginkgo and iron clothes with boiling water to remove the heart; Wash chrysanthemums and pick petals; Peel and core Sydney and cut into granules. First, put ginkgo and Sydney into the boiling water pot, the water content should not be too much, simmer until the ginkgo is cooked, add chrysanthemum, fresh milk or light milk and cook slightly. Turn off the fire, after the temperature drops slightly, add some honey and make sweet soup. This amount can be used by 2-3 people.

2, radish almond boiled beef lung

[Ingredients] 500g radish, bitter almond 15g, 250g bovine lung.

[Production] Radish cut into pieces, almond peeled and pointed. Scalded beef lungs with boiling water, then stir-fry with ginger juice and cooking wine. Add appropriate amount of water to the earthen pot, add beef lung, radish and almond, and cook.

【 Efficacy 】 Tonifying lung and clearing lung, lowering qi and resolving phlegm.

【 Method 】 Eat lung and drink soup. 2-3 times a week.