Is the 2020 autumnal equinox the equinox of day and night? Is it autumn
in autumn in China, the weather is gradually cool, and the temperature difference between day and night is very different. The autumnal equinox is the solar term in autumn. Is the 2020 autumnal equinox the equinox of day and night? Is the autumnal equinox autumn? Let's understand this solar term together with the old yellow calendar?
is the 2020 autumnal equinox the equinox of day and night: Yes, on the autumnal equinox, the time of day and night is equal. On this day, the sun reaches 180 degrees of the Yellow meridians and directly hits the earth's equator. Therefore, the 24-hour equinox of the day in most parts of the world is 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.
autumnal equinox is autumn: Yes, the autumnal equinox is the beginning of autumn in the real sense. According to the standard of dividing seasons according to the average climate temperature, autumn must be when the average temperature for five consecutive days is below 22 ℃. According to this standard, the Jianghuai region generally enters autumn in the middle and late September. After the beginning of autumn, although the heat is hard to dissipate for a while, although there is the residual power of "autumn tiger", the general trend is that the weather is gradually cool. The equinox solar term has really entered autumn. The temperature began to drop sharply and became colder.
according to the lunar calendar, "beginning of autumn" is the beginning of autumn, and the "frost fall" is the end of autumn, and the "autumnal equinox" is just half of the 90 days from beginning of autumn to frost fall. Therefore, according to the autumn theory of China's old calendar, this day is just half of the 90 days of autumn. What we usually call autumn starts from the autumnal equinox. At the 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 and temperature drop 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.https://www.dailyq-a.com/Culture/30238.html
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