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Is it cool at the 2020 autumnal equinox? The length of day and night changes

DailyBird Culture 2021-10-09 1 0

has a special solar term in autumn in China, that is the autumnal equinox. When the autumnal equinox comes, there will be some different changes. Will the 2020 autumnal equinox be cool? What is the variation of day and night at the autumnal equinox? Let's understand this solar term with the old yellow calendar!

2020秋分是不是就凉快了呢 昼夜长短变化

is it cool at the 2020 autumnal equinox: during the gradually cooling autumnal equinox, most parts of China have entered a cool autumn. The cold air going south meets the gradually decaying warm and humid air, resulting in precipitation again and again, and the temperature drops again and again. As people often say, it is time for "one autumn rain and one cold", but the daily precipitation after the autumnal equinox will not be very large. On the autumnal equinox, day and night are as long as twelve hours. From this day on, the days are getting shorter and shorter, the sunshine is longer and less, and the weather is getting colder and colder day by day. After the autumnal equinox solar term, the weather began to turn cold. As a transitional season from hot to cool, most parts of China have entered a cool autumn. The cold air going south meets the gradually decaying warm and humid air, resulting in repeated precipitation, and the temperature drops again and again.

2020秋分是不是就凉快了呢 昼夜长短变化

the length of day and night on the autumnal equinox changes: the length of day and night is the same, and the time of day and night is equal. On this day, the sun reaches 180 degrees of the Yellow meridian and directly hits the earth's equator. Therefore, the 24-hour day and night in most parts of the world is divided equally, 12 hours each. After the autumnal equinox, the direct point of the sun begins to enter the Southern Hemisphere from the equator, the northern hemisphere begins to have shorter days and longer nights, and the day is shorter than the night; Near the Arctic is also about to usher in a long night for six consecutive months of the year and a starry sky for six consecutive months. From the spring equinox to the summer solstice, the days in the northern hemisphere are getting longer and shorter, while the nights in the southern hemisphere are getting longer and shorter. From the summer solstice to the autumnal equinox, the day gradually becomes shorter and the night gradually becomes longer, but the day is still long and the night is short; There is a polar day phenomenon in the north of the Arctic Circle, but the range of polar day is gradually reduced from the polar circle to the pole. During the winter solstice, the day in the northern hemisphere reaches the minimum value in a year, the night reaches the maximum value in a year, and the range of polar night reaches the maximum. All the Arctic Circle and its northern regions are polar night. From the winter solstice to the spring equinox, the days begin to grow longer and the nights begin to shorten, but the days are still short and the nights grow back; The polar night phenomenon still exists in the north of the Arctic Circle, but the scope of the polar night gradually shrinks from the polar circle to the pole. By the spring equinox, it becomes the same length of day and night again. The southern hemisphere is opposite to the northern hemisphere. Day and night equinox on the equator all year round.

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