When is the autumnal equinox?

The autumnal equinox is the 28th day of the eighth lunar month.

The autumnal equinox is one of the twenty-four solar terms, and the date is between September 22nd and 24th in the Gregorian calendar. On this day, the sun shines almost directly on the equator of the earth, and the length of day and night is equal all over the world. 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 a traditional festival to worship the moon, and the Mid-Autumn Festival evolved from the autumn festival to worship the moon.

The autumnal equinox falls on September 22nd, 23rd or 24th of the Gregorian calendar every year, which is the twenty-four solar terms in traditional festivals in China. At this time, the sun on Vitex negundo reaches 180 degrees. At the autumnal equinox, most parts of the earth are equally divided day and night, each with 12 hours. Near the North Pole and South Pole, the sun can be observed on the horizon all day on this day.

Introduction of solar terms

In the autumn equinox, most parts of China have entered a cool autumn. The cold air from the south meets the gradually decaying warm and humid air, which leads to precipitation again and again and the temperature drops again and again. It's time for another autumn cold, but the daily precipitation after the autumnal equinox will not be very large.

Farmland cultivation in the north and south is different. There is an agricultural proverb in North China, China: White dew is early, cold dew is late, and the autumn equinox is the time to plant wheat. The proverb Lao Zi San clearly stipulates the sowing time of winter wheat in this area.

The autumnal equinox is cloudy, and there are good songs and rice planting everywhere, which reflects the sowing time of rice in Jiangnan area. In addition, the taboos of working people on the autumnal equinox and solar terms have also been summarized into proverbs. It is rainy and humid in autumn in the south and Liangshan Prefecture, which has great influence on autumn harvest, autumn ploughing and autumn planting. We should catch the sun, control soil moisture and prevent waterlogging, and pay special attention to the quality and progress of production in Sanqiu.

We should also make full use of the meteorological conditions with less rain and good soil moisture in autumn, seize the opportunity to engage in afforestation and strive to improve the survival rate of saplings.