Which solar term is the Mid-Autumn Equinox in 24 solar terms?

The autumnal equinox is the sixteenth of the twenty-four solar terms, and the time is generally from September 22 to September 24 of the Gregorian calendar every year. On the day of the autumnal equinox, the sun reaches the longitude 180 (autumnal equinox), almost reaching the equator of the earth, and the length of day and night is equal all over the world (regardless of the refraction of the sun light by the atmosphere and the shadow in the morning). In ancient times, there was a folk activity of "offering sacrifices to the sun in spring and the moon in autumn". The autumnal equinox used to be the traditional "Moon Festival" (Mid-Autumn Festival), which evolved from offering sacrifices to the moon in autumn.

After the autumnal equinox, the direct point of the sun continued to move from the equator to the southern hemisphere, and the days in the northern hemisphere began to shorten and the nights became longer, that is, the days in a day began to be shorter than the nights; The southern hemisphere is the opposite. Therefore, the autumnal equinox is also called the landing point.

At the North Pole and South Pole, on the day of the autumn equinox, the sun is on the horizon all day. After that, as the direct point of the sun continued to move southward, a six-month polar night began near the North Pole, which gradually expanded and then narrowed. A six-month polar day began near the South Pole, which gradually expanded and then narrowed.

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This year's "Autumn Equinox" is the earliest in 124 years.

On September 22nd, 2 1: 3 1 will usher in the solar term "autumnal equinox", which indicates a bumper harvest. Astronomical experts say that this year's "autumnal equinox" is the earliest year since 1896.

Shi Zhicheng, a member of the Chinese Astronomical Society and director of the Tianjin Astronomical Society, said that the time when the earth moves around the sun is called "tropic year" or "solar year", and the running route of the sun under the starry sky background is called "ecliptic".

Since ancient times, the "vernal equinox" has been set at 0 degrees, and every time the sun moves 15 degrees on the ecliptic, it is set as a solar term or neutral gas. So the 24 solar terms have 24 specific moments instead of 24 specific days.

Xinhua News Agency-This year's "Autumn Equinox" is the earliest since 124 years.

Baidu encyclopedia-autumnal equinox