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The autumnal equinox is the equinox of day and night around the world. Today you can determine the due east and due west of your location

Geography Salon

The public account "Geography Salon" shares and learns geographical knowledge useful for life

Human beings live in the natural geographical environment. In order to survive and develop, humans usually need to adapt to the local natural geographical environment. As the saying goes, adapt The right time and the right place. Among them, climate is the most cyclically changing natural factor. During the period of agricultural society, agricultural production needed to adapt to climate changes and adhere to the farming season. For this reason, our ancestors invented the traditional Chinese calendar, which is commonly known as the lunar calendar.

Today’s Autumnal Equinox

The Chinese lunar calendar is based on the changing cycle of the moon phases. Each lunar phase change is one month, referring to the solar return year as the length of one year, and by setting two The fourteen solar terms and leap months are used to adapt the average calendar year to the tropical year. The twenty-four solar terms are Beginning of Spring, Rain, Jingzhe, Vernal Equinox, Qingming, Grain Rain, Beginning of Summer, Xiaoman, Ear Grain, Summer Solstice, Minor Heat, Great Heat, Beginning of Autumn, End of Heat, White Dew, Autumnal Equinox, Cold Dew, Frost Descent, Beginning of Winter, Light Snow, Heavy Snow, Winter Solstice, Minor cold and major cold.

Twenty-Four Solar Terms

September 23, 2021 is the autumnal equinox this year. At the autumnal equinox, when the sun reaches 180° of ecliptic longitude, it is about 15 days after the Bailu solar term, which is the time of autumn. The fourth solar term usually falls in late September of the Gregorian calendar every year, usually on September 22, 23 or 24. During the autumnal equinox, the direct point of the sun is at the equator, and the height of the sun at noon decreases from the equator to the north and south poles. Today, the height of the sun at noon is 90° everywhere on the equator. At a latitude of 30° north, the height of the sun at noon today is 60°; at a latitude of 40° north, the height of the sun at noon today is 50°, and so on.

Moving chart of the equinox solstices and the direct sun point

From the perspective of the length of day and night, during the autumnal equinox, day and night are equally divided in all parts of the world. Except for the north and south poles, the world's Today in various places, the day is 12 hours long, and the night is also 12 hours long. As the saying goes, "the autumnal equinox is half yin and yang, when summer retreats and autumn becomes cooler." Today is the process when the sun's direct point moves from north to south, just hitting the equator. In other words, after today, the sun's direct point will move to the southern hemisphere. The northern hemisphere will enter the winter half of the year when the days are short and the nights are long, while the southern hemisphere will enter the daytime period. The long nights and short summer half of the year.

Autumn

From the perspective of sunrise and sunset, when the sun shines directly on the northern hemisphere, the sun rises from the northeast in all parts of the world (except for polar day and polar night areas), and rises from the northwest. Set; when the sun shines directly on the southern hemisphere, the sun rises from the southeast and sets from the southwest everywhere in the world; when the sun shines directly on the equator, the sun rises from the east and sets from the west everywhere.

Today happens to be the autumnal equinox, so the direction in which the sun rises today is due east of where you are, and the direction in which it sets is due west. If possible, go and observe it!

Solstic solar motion chart at 40° north latitude

Edited on 2021-09-23 · Copyright belongs to the author

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