The characteristics and significance of the autumn equinox and solar terms
The autumnal equinox is the fourth solar term in autumn.It has the characteristics of falling temperature, increasing temperature difference between day and night, and shorter days in the northern hemisphere.At the same time, it also means that we need to carry out agricultural activities such as autumn harvest and cultivation.
Introduction to the Autumnal Equinox
The Autumnal Equinox is the 4th solar term in autumn and the 16th in the twenty-four solar terms.Every September 23 or 24, when the sun reaches 180 degrees of ecliptic longitude, it is the autumnal equinox.The sun directly hits the earth’s equator, and day and night are equally divided, each 12 hours.The global phenomenon of polar day and polar night.After the autumnal equinox, the direct sunlight point continues to move southward, so the autumnal equinox is also called the descending equinox.Since then, the temperature difference between day and night will gradually increase, the amplitude will be higher than 10 ℃.During the autumnal equinox, it is necessary to prevent coldness and dryness, and insist on exercising.In terms of diet, you should drink plenty of water and eat clear, moist food.
Meteorological characteristics of the autumnal equinox
According to the lunar calendar, "Liqiu" is the beginning of autumn, and the "Frostfall" is the end of autumn.half of the day.From the autumn equinox, the climate has three main characteristics:the position of direct sunlight continues to move from the equator to the southern hemisphere, the phenomenon of short days and long nights in the northern hemisphere will become more and more obvious, the days will gradually become shorter, and the nights will become longer (until the winter solstice reaches the The night is the longest and the day is the shortest); the temperature difference between day and night gradually increases; the temperature drops day by day, getting colder day by day, and gradually entering the late autumn season.In the southern hemisphere, the opposite is true.
The phenological characteristics of the autumnal equinox and solar terms
The ancients in my country divided the autumnal equinox into three phases:first, the sound of thunder begins; second, stinging insects; The ancients believed that the thunder sounded because the yang qi was strong, and after the autumn equinox, the yin qi began to flourish, so there was no more thunder.Therefore, the sound of thunder is not only the end of the summer heat, but also the beginning of the autumn cold; as the weather becomes cold, the hibernating insects begin to hide in the cave, and the hole is sealed with fine soil to prevent the cold air from invading; due to the dry weather, the water vapor evaporates So the lakes and rivers have less water, and some marshes and puddles are drying up.
Significance of the Autumn Equinox
The characteristics of rapid cooling in autumn make the "three autumn solar terms and health care" busy in autumn harvest, autumn ploughing and autumn planting seem particularly tense.In the autumn equinox, cotton spit and tobacco leaves turn from green to yellow, which is a good time to harvest.Winter wheat has been planted in North China, and the Yangtze River Basin and the vast southern regions are busy harvesting late rice, ploughing the land and preparing for rapeseed.Drought and little rain or continuous overcast rain during the autumnal equinox are the main unfavorable factors affecting the normal progress of the "Three Autumns", especially the continuous overcast and rainy crops will lodging, moldy or germinate, causing serious losses."Sanqiu" is very busy, and the word "early" is the most expensive.Harvesting autumn crops in time can avoid the harm of early frost and continuous rain, and sowing winter crops early in time can strive to make full use of the heat resources before winter, cultivate strong seedlings to survive the winter safely, and lay the foundation for a high yield in the coming year.
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