Comprehensive analysis: What does the vernal equinox mean?

China has always been a country that focuses on agricultural production, which is closely related to the climate. In order to better grasp the climate characteristics of each season, the ancients subdivided the four seasons into twenty-four solar terms. The naming of the twenty-four solar terms also includes the wisdom of the ancients. What does the word "fen" mean in the autumn equinox?

"Points" here means equal distribution. The vernal equinox and autumnal equinox are called "equal share", which means that the length of day and night is equal. These two solar terms are generally around March 20 and September 23 of the Gregorian calendar every year. At the vernal equinox and autumnal equinox, the ecliptic intersects the equatorial plane. At this time, the ecliptic is 0 degrees and 180 degrees respectively, and the sun shines directly on the equator, and day and night are equal.

In ancient China, the autumnal equinox was divided into three periods: "When thunder comes, the sound will stop;" Second, wait for scorpion blank households; Wait for the water to dry. "The ancients thought it thundered because the sun be the spirit is strong, and the yin began to fill after the autumnal equinox, so it didn't thunder. The word "blank" in the second phase means fine soil, that is to say, due to the cold weather, secluded small insects began to hide in Tibetan caves and sealed the hole with fine soil to prevent cold air from invading. " The water began to dry up "means that the rainfall began to decrease at this time. Because of the dry weather, the water vapor evaporates quickly, the water in lakes and rivers becomes less, and some swamps and puddles dry up.

The rapid cooling in autumn makes the autumn harvest, autumn ploughing and autumn planting "Sanqiu" particularly nervous. According to research, the autumnal equinox has always been regarded as a symbol of farming in China. At the end of the Han Dynasty, Cui Mang wrote in the "Four-person Moon Order": "Where wheat is planted, the white deer can be in the thin field, the autumnal equinox in nakata, and the latter ten days in nakata." The autumnal equinox is a good time for harvest. Farmers' friends should grab the autumn harvest crops in time to avoid the harm of the first frost and continuous rain; It is also necessary to sow winter crops early in time to lay the foundation for high yield in the coming year.

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