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The autumnal equinox and solar terms are equally divided day and night around the world. Today, you can determine

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The autumnal equinox and solar terms are equally divided day and night around the world. Today, you can determine the east-west direction of your position.

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Wechat official account "Geography Salon" shares learning geography knowledge useful for life.

Human beings live in a natural geographical environment. In order to survive and develop, human beings usually need to adapt to the local natural geographical environment, which is called adapting to the weather and geographical location. Among them, climate is the most periodic natural factor. In an agricultural society, agricultural production needs to adapt to climate change and not go against the farming season. To this end, our ancestors invented the traditional calendar in China, also known as the lunar calendar.

Today is the autumnal equinox

The lunar calendar in China is based on the changing cycle of the lunar phases, and each lunar phase changes to January. With reference to the solar year as the length of a year, the average calendar year is adapted to the tropic year by setting 24 solar terms and leap months. The 24 solar terms are beginning of spring, Rain, Surprise, Equinox, Qingming, Grain Rain, Long Summer, Xiaoman, Busy, Summer Solstice, Slight Summer, Great Summer, beginning of autumn, Chushu, Millennium, Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

The 24 Solar Terms

September 23rd, 20021year is the solar term of this year's autumn equinox. When the autumnal equinox sun reaches 180, it is about 15 days after the Millennium solar term, which is the fourth solar term in autumn, usually in late September of Gregorian calendar, usually on September 22, 23 or 24. At the autumnal equinox, the direct point of the sun is located at the equator, and the height of the sun decreases from the equator to the north and south poles at noon. Today, the noon sun on the equator reaches 90 degrees. 30 north latitude, the height of the sun at noon today is 60; 40 north latitude, 50 sun at noon today, and so on.

Motion diagram bisecting the sun and the direct point of the sun

Judging from the length of day and night, during the autumnal equinox and solar terms, the world is divided equally between day and night. Except for the North Pole and the South Pole, the length of day is 65,438+02 hours and the length of night is 65,438+02 hours all over the world today. As the saying goes, "The autumn equinox is half cloudy and half sunny, and the summer is cool." Today is the process of the direct point of the sun moving from north to south, right on the equator. That is to say, after today, the direct point of the sun will move to the southern hemisphere, which will enter the winter half year with short days and long nights, while the southern hemisphere will enter the summer half year with long days and short nights.

autumn

From the perspective of sunrise and sunset, when the sun shines directly in the northern hemisphere, the sun all over the world rises in the northeast and sets in the northwest (except in extreme day and night areas); When the sun shines directly in the southern hemisphere, the sun all over the world rises from the southeast and sets in the southwest; When the sun shines directly on the equator, the sun all over the world rises from the due east and sets from the due west. Today is the solar term of the autumnal equinox, so the rising direction of the sun today is due east of your position, and the setting direction is due west. If possible, go and observe!

Solar motion map of bisection to heliograph at 40 north latitude.

Edited on 20021-09-23, the copyright belongs to the author.

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