2065438+September 23rd, 2007, the autumnal equinox is even from day to night, but the cold and summer are even?

The autumnal equinox season of "Yan Xi will leave tomorrow, and the autumnal equinox is at this time" is the sixteenth solar term in a year. After the vernal equinox, the world is divided into day and night again. Since then, the days in all parts of the northern hemisphere have become shorter, but the nights in all parts of the southern hemisphere have become longer. Then let the old calendar briefly introduce this special solar term-the autumnal equinox.

Q: What is the autumnal equinox of 20 17? A: The autumnal equinox of 20 17 is September 23rd.

The autumnal equinox is the sixteenth solar term in the twenty-four solar terms of the lunar calendar, which comes around September 23rd of the Gregorian calendar every year. According to the astronomical calendar of China, at 4: 02 on September 23rd, 20 17, Beijing time will usher in the "autumnal equinox" in the twenty-four solar terms of the lunar calendar, and day and night will be divided equally again after the autumnal equinox.

The autumnal equinox is just in the middle of 90 days in autumn, which means "equal share", so it is called "autumnal equinox". On this day, the sun shines directly on the equator of the earth, distributing light and heat equally to the northern and southern hemispheres. Since then, the direct point of sunlight has become more and more inclined to the southern hemisphere, and the day is shorter than the night. Until the solstice of winter, the climate in the northern hemisphere has changed from hot to cold. Therefore, China's ancient book "Spring and Autumn Stories" said: "The autumnal equinox, yin and yang are half combined, so it is cold and summer day and night."

Autumn equinox season, breezy, blue sky and Wan Li, sunny weather, crisp autumn air, sweet-scented osmanthus fragrance, crab fat chrysanthemum yellow, is a beautiful and pleasant season, at the same time, it is also an important solar term in agricultural production. Astronomers say that this festival is a busy time for autumn harvest, autumn ploughing and autumn sowing in Sanqiu. Most areas of China have entered the autumn harvest season. Farmers are busy harvesting and drying grain, and the fields, fields and courtyards are all golden.

There is a saying in China folk proverb: "A thousand years in autumn, one night is cold". Health experts suggest that after the arrival of the autumnal equinox season, in order to prevent colds, the public should pay attention to diet conditioning, strengthen self-care, and add clothes and quilts in time to avoid excessive "autumn freezing".

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