When is the autumn wind in 2023?

The autumn wind in 2023 is September 23, the ninth day of the eighth lunar month.

Autumn solar terms, namely the autumnal equinox solar terms, are also important solar terms in agricultural production. After the autumn wind, the position of direct sunlight shifted to the southern hemisphere, and the northern hemisphere got less and less solar radiation, while the ground lost more heat, and the temperature dropped significantly faster. It is the sixteenth of the twenty-four solar terms in the lunar calendar, usually on September 22nd or 23rd every year.

The climate in the south began to decline from this solar term. First, on this day, the sun reached 180 degrees and hit the equator of the earth directly. So this day is divided equally between day and night, each with 12 hours, and there is no extreme day and night phenomenon in the world. After the autumnal equinox, the polar night range near the North Pole gradually expanded, and the polar day range near the South Pole gradually expanded. The autumn wind season was equally divided, and the nights became longer and the days became shorter.

The relevant provisions of the solar terms:

The current 24 solar terms adopt the method of constant gas. According to the position change of the earth on the ecliptic (the earth's orbit around the sun), each node corresponds to a certain position that the earth reaches every time it runs 15 on the ecliptic. It is a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year.

It divides the sun's annual trajectory into 24 equal parts, each 15 is an equal part, and each equal part is a solar term, starting in beginning of spring and ending in severe cold. Each solar term represents climate, phenology and time. The lunar calendar in China is a kind of lunar calendar, which is based on the movements of the sun and the moon. Therefore, 24 solar terms can better reflect the cycle of the sun's movement.

The above contents refer to Baidu Encyclopedia-Autumn Wind.