When is the Autumnal Equinox? What are the weather characteristics of this day?
During the Autumnal Equinox, the wheat grains are round, while during the Cold Dew, the wheat grains have grooves. It is talking about the agricultural phenomenon of the Autumnal Equinox. So, what kind of day is the Autumnal Equinox? How is this day different from other days? In the eighth month of the lunar calendar, the sky is high and the clouds are light, and the moon is clear in the cold pond; in the eighth month of the lunar calendar, the wind is clear and the air is refreshing, and the osmanthus fragrance is in the air; in the eighth month of the lunar calendar, the world is colorful and the harvest is abundant. Come to Mr. Shui Mo to learn more about the eighth month of the lunar calendar in 2018.What is the Autumnal Equinox?The four seasons in my country are divided by the Beginning of Spring, Beginning of Summer, Beginning of Autumn, and Beginning of Winter. The Autumnal Equinox is right in the middle of the autumn season. It can be said that the Autumnal Equinox divides the entire autumn into equal parts, just like the Vernal Equinox. The Autumnal Equinox is the sixteenth of the twenty-four solar terms, occurring between September 22 and 24 of the Gregorian calendar each year, when the sun reaches 180° of ecliptic longitude and shines directly on the equator. On this day, day and night are of equal length everywhere in the world, and the North and South Poles are about to begin a six-month long period of polar day and polar night. In agriculture, on the Autumnal Equinox, most parts of my country began the "three autumns" work of autumn harvest, autumn plowing and autumn planting. The so-called autumn harvest is just as it is written in "Records of the Grand Historian - The Autobiography of Sima Qian": "Spring brings life, summer brings growth, autumn brings harvest, and winter brings storage. This is the great principle of Heaven." Sorghum is best harvested when it is ripe because the grain skin is thick and easy to fall off during the ripe stage. "Ten percent harvest, eight percent lost; eight percent harvest, ten percent harvest" illustrates the benefits of harvesting when it is ripe. Millet should be harvested when it is fully ripe. "When the sickle is used to harvest millet, a handful of chaff falls off," which means that harvesting millet when it is milky or yellow will result in barren grains. As for autumn ploughing, it can improve the soil, maintain soil and water, increase soil fertility, remove weeds, and reduce diseases and insect pests. The temperature of plowed soil can be increased by 1.2℃ compared to unplowed soil, and the temperature difference between day and night can be reduced by 2 degrees. Autumn ploughing is very beneficial to the activity of beneficial microorganisms in the soil. The organic matter in the soil and the mineral elements that cannot be absorbed by crops can be decomposed more quickly by soil microorganisms and absorbed and utilized by crops. Autumn planting mainly refers to planting winter wheat. There is an agricultural proverb that goes, "White Dew comes early, Cold Dew comes late, and it is the right time to plant wheat at the Autumnal Equinox." If you plant too early and the temperature is above 20 degrees, the wheat seedlings will often grow vigorously before winter, with too lush leaves and stems, making them susceptible to frost damage during the winter. If you plant too late and the temperature is below 10 degrees, the wheat seedlings will have a short growth period before winter, with poor tillering and root growth, causing them to be thin and weak before winter and unable to accumulate nutrients, which is not conducive to their re-greening during the winter. Therefore, wheat must be planted according to local climatic conditions and in the right time and place.What are the weather characteristics on the autumnal equinox?1. The temperature drops day by day, getting colder day by day, and gradually entering the late autumn season. The situation in the Southern Hemisphere is exactly the opposite. 2. The temperature difference between day and night will gradually increase, with the range exceeding 10°C; 3. The position of direct sunlight will continue to move from the equator to the southern hemisphere, and the daytime will be shorter than the nighttime in all parts of the northern hemisphere until the shortest day of the year is the winter solstice; |
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