When is the autumn equinox?

The autumnal equinox in 2023 is September 23rd 14: 49: 46.

The autumnal equinox is the sixteenth solar term among the twenty-four solar terms and the fourth solar term in autumn. Fight refers to unitary; The sun reaches the yellow meridian180; Celebrated on September 22-24 of the Gregorian calendar every year. The autumnal equinox means "equally divided" and "equally divided", which means equally dividing autumn except day and night. After the autumnal equinox, the position of direct sunlight moves south, and the days in the northern hemisphere become shorter, the nights become longer, the temperature difference between day and night increases, and the temperature drops day by day.

The autumnal equinox used to be the traditional "Festival of Sacrificing the Moon". Now Mid-Autumn Festival comes from the traditional autumnal equinox "offering sacrifices to the moon". According to textual research, the Mid-Autumn Festival was originally set on the day of the autumnal equinox, but because this day is not always a full moon, the Mid-Autumn Festival was later transferred from the twenty-four solar terms of the autumnal equinox to the fifteenth day of the eighth lunar month.

Agricultural activities at the autumnal equinox

The characteristics of rapid cooling in autumn make "Sanqiu solar terms for health" particularly tense in the busy autumn harvest, autumn ploughing and autumn planting. The autumnal equinox is a good time to harvest cotton and tobacco leaves from green to yellow. Winter wheat has been planted in North China, and the Yangtze River basin and vast areas in the south are busy harvesting late rice and ploughing the land to prepare for rape sowing.

Drought and lack of rainfall or continuous rainfall in autumn equinox are the main unfavorable factors affecting the normal operation of Sanqiu, especially the continuous rainfall will make the upcoming crops lodging, mildewing or sprouting, resulting in serious losses. "Sanqiu" is a great help, and the word "early" is the key. Timely harvest of crops in autumn can avoid the harm of first frost and continuous rain, and timely sowing of crops in winter can make full use of heat resources before winter, cultivate strong seedlings to survive the winter safely, and lay the foundation for high yield in the coming year.

The above contents refer to Baidu Encyclopedia-Autumn Equinox.