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Today's autumn equinox: the sun almost directs the day and night of the world around the world

via:快科技     time:2022/9/23 12:01:06     readed:49

Today is August 28th in the lunar calendar, the 16th solar terms of the twenty -four solar terms, and the fourth solar terms in autumn & mdash; & mdash; autumnal equinox.

On the autumn equinox, the sunlight shot on the day of the sun reaches 180 & deg; (autumnal equinox), almost direct the earth equator, and the length of day and night around the world (do not consider the refraction of the sun and the morning shadow of the sun).

今日秋分:太阳几乎直射赤道 全球各地昼夜等长

After the autumnal equinox, the direct point of the sun continued to move from the equator to the south hemisphere. The day and night began to be short and night in the northern hemisphere, that is, the daytime day was shorter than the night, the temperature difference between day and night increased, the temperature decreased day by day, and the southern hemisphere was opposite. Therefore, autumn equinox is also called downgrade.

On the north and south poles, on the day of the autumn equinox, the sun is on the horizon all day.

In the autumnal equinox, the Chinese Yangtze River Basin and its vast areas north have entered & ldquo; the average temperature & rdquo; divided into autumn, the average daily temperature has dropped below 22 ° C.

今日秋分:太阳几乎直射赤道 全球各地昼夜等长

After the autumnal equinox, the direct sunlight shifts south, the northern hemisphere is short and long, the temperature difference between the day and night increases, the solar radiation obtained by the northern hemisphere is getting less and less, but the calories of the ground are lost. Essence

This is mentioned in the farm proverb: & ldquo; A autumn rain and a cold & rdquo;, & ldquo; Bai Lulu Qiu Qiu Qiu Qiu, overnight and one night & rdquo;.

今日秋分:太阳几乎直射赤道 全球各地昼夜等长

The characteristics of fast cooling in autumn make the autumn harvest, autumn plowing, autumn species & ldquo; Three autumn festivals & rdquo; busyness seems particularly nervous. In the autumn, cotton spit, and the tobacco leaves are also green to yellow, which is a great time to gain.

Because of this, since 2018, my country has set up the autumn equinox every year to & ldquo; Chinese farmers' harvest festival & rdquo;

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