What do you know about the autumnal equinox? What is the origin and meaning of the autumnal equinox?

Every year around September 23, when the sun reaches 180 degrees of ecliptic longitude, it enters the "autumnal equinox" solar term. "Autumn equinox" and "spring equinox" are the earliest solar terms established by the ancients. According to "Spring and Autumn Dew Yin and Yang in and Out", it said:

The autumn equinox is accompanied by yin and yang, so the day and night are equal, and the cold and summer are equal. ”

The "autumn equinox" has two meanings: one is that according to ancient China, the beginning of spring, the beginning of summer, the beginning of autumn, and the beginning of winter are four hours and four hours, and the autumn equinox is in the 90 days of autumn, and autumn is equally divided. The second is 24 hours day and night, 12 hours each.

This day is the same as the day of the "vernal equinox". On the day of the "autumnal equinox", the sun shines almost directly on the equator. After this day, the direct sunlight position shifts southward, and the northern hemisphere becomes shorter in the days and longer in the nights.

In ancient China, the autumn equinox was divided into three periods: "one is the sound of thunder, the second is the sound of insects, and the third is that the water begins to dry up." The ancients believed that the thunder sounded because the yang energy was strong, and after the autumn equinox, the yin energy began to prevail, so there was no thunder.

In the second stage, the word "empty" refers to fine soil, which means that due to the cold weather, hidden insects begin to hide in the hole, and the hole is sealed with fine soil to prevent cold air from entering.

"Water starts to dry up" is when rainfall begins to decrease. Due to the dry weather, water vapor evaporates rapidly, lakes and rivers are experiencing less water, and some swamps and puddles are drying up. During the autumnal equinox, most of our country has entered a cool autumn.

Cold air from the south meets warm, moist air that is declining, causing repeated precipitation and temperature drops. As it is often said, when it comes to "one autumn rain and one cold", the daily precipitation after the autumn equinox will not be very large.

At this time, the cultivation of the fields in the north and south was different. In North China, there is a peasant proverb: "The white dew is early, the cold dew is late, and the wheat is at the autumn equinox".

The proverb clearly stipulates when winter wheat will be sown in the region; The time of sowing rice in the Gangnam area. In addition, the taboo of working people on the autumn equinox solar terms is also summarized as proverbs, such as "the autumn equinox is only afraid of thunder and lightning, how much is the price of rice".

During this period, many parts of the country began to enter periods of less precipitation. After the autumn equinox, the number of rainy days and rainfall in most parts of China, including Jiangnan and South China (except for the heavy rain brought by tropical cyclones), entered a period of reduced precipitation, the water level of rivers and lakes began to decline, and some seasonal rivers and lakes even gradually dried up. During this period, there may still be a few tropical cyclones, but they will affect the south, and most of them will affect the South China coast and Hainan Island.

In addition to strong winds, rainfall from typhoons at this time tends to help maintain soil moisture, as these areas have been transitioning to the dry season since October. The characteristics of the rapid cooling in autumn make the "three autumns" of autumn harvest, autumn ploughing and autumn planting particularly tense.

For a long time, China has used the "autumn equinox" as a symbol of farming. Cui Yu at the end of the Han Dynasty wrote in the "Four Peoples Moon Order": "Whoever grows barley, the White Deer Festival can have thin fields, the autumn equinox can have middle fields, and the next ten days can have beautiful fields."

The autumnal equinox is a good time to harvest. Farmers should pay close attention to the autumn harvest to avoid the harm of early frost and rain; Winter crops should also be sown as early as possible to lay the foundation for high yields in the coming year.

The autumnal equinox is a harvest season, the season for harvesting crops. The autumn equinox symbolizes the autumn harvest, and the meaning of the autumn equinox is also to divide the autumn equally, and the autumn equinox day is half of the 90 days of autumn, which divides the autumn.

The autumnal equinox is a time when days are as long as night, and it is a day for many farmers to celebrate the harvest of their crops, representing peace and joy.

It should be after the autumn equinox, which means that autumn has really arrived, and the temperature may drop.

On this day, the sun reaches 180 degrees of ecliptic longitude and hits the Earth's equator, so the day is 24 hours equinox, 12 hours each; The global phenomenon of infinite diurnal and nocturnal. Or according to the ancient Chinese season division method that began with the beginning of spring, summer, autumn and winter, the autumn equinox is among the 90 days of autumn, and the autumn is equally divided.

The autumnal equinox has two meanings: one is that the sun reaches 180 degrees of ecliptic longitude on this day and hits the earth's equator directly, so the day and night are equally divided into 24 hours, each 12 hours; 20. According to the ancient Chinese division method of starting with the beginning of spring, the beginning of summer, the beginning of autumn, and the beginning of winter, the autumn equinox is among the 90 days of autumn, and the autumn is equally divided.

The sixteenth of the 24 solar terms in the lunar calendar is generally on September 22 or 23 every year. The climate in the south begins with this solar term before autumn. After the autumnal equinox, the polar night range near the North Pole becomes larger, and the polar day range near the South Pole increases.

In fact, it starts from the autumn equinox into autumn, from the spring equinox the days are long and the nights are short, and from the autumn equinox the days are short and the nights are long, and the biggest feature of the spring equinox and the autumn equinox is that the day and night are equal.

What does the spring equinox mean, what does the autumn equinox mean....