What is the meaning of the 24 solar terms autumnal equinox? What is the special phenomenon
each different solar term has its own characteristics, and the autumnal equinox is also one of the solar terms, but many people are not very clear about the autumnal equinox, so what does the 24 solar term autumnal equinox mean? What is the special phenomenon of the autumnal equinox? Let's analyze this solar term with the old yellow calendar!
what is the meaning of the 24 solar terms autumnal equinox? The spring equinox and autumnal equinox are collectively referred to as "dichotomy", indicating 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 spring equinox and autumn equinox, the ecliptic intersects the equatorial plane. At this time, the Yellow meridians are 0 degrees and 180 degrees respectively. The sun shines directly on the equator, and day and night are equal. In ancient China, the autumnal equinox was divided into three periods: "first, the thunder began to stop; second, the insects began to sting; third, the water began to dry up". The ancients believed that thunder sounded because of the exuberance of Yang Qi. After the autumn equinox, Yin Qi began to flourish, so it stopped thundering. The word "blank" in the second phase means fine soil, that is, due to the cold weather, the dormant insects begin to hide in the Tibetan cave and seal the hole with fine soil to prevent the invasion of cold air. "Water began to dry up" means that the rainfall began to decrease at this time. Due to the dry weather and rapid evaporation of water vapor, the water in lakes and rivers became less, and some swamps and water depressions were dried up. The characteristics of rapid cooling in autumn make the "three autumn" busy of autumn harvest, autumn tillage and autumn planting particularly nervous. According to research, China has long regarded the "autumnal equinox" as the symbol of farming. At the end of the Han Dynasty, Cui Shi wrote in the four people's monthly order: "all kinds of wheat can be planted in thin fields at the White Dew Festival, in the middle fields at the autumn equinox, and in the beautiful fields in the next ten days." the autumn equinox is a good time for harvest. Farmers should rush to harvest autumn crops in time to avoid the harm of early frost and continuous rain; We should also sow winter crops in time and early to lay a foundation for high yield in the coming year.
what is the special phenomenon of the autumnal equinox? 1. You can't find your own shadow, because the direct point of the sun shines on the equator impartially. When you come to the equatorial line, you will find that no object can find its own shadow.
2. The north and south poles share the same day. On the autumnal equinox, the sun shines directly at the equator. At the same time, the north and south poles can see the sun and share the same day.
3. The height is as long as the shadow on the 45 ° north latitude line. They can measure the height of the building without climbing, because they seem to have discussed with their shadow long ago. Because the height of this day is as long as the shadow, you know the length of the shadow and the height of the building.https://www.dailyq-a.com/Culture/30352.html
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