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Is the winter solstice fixed? December 22-23 every year

DailyBird Culture 2021-10-09 1 0
The arrival time of each solar term of

has a different situation, but we still need to know whether the arrival time of each solar term is a fixed situation? So when the solar term comes every year, what way should we determine the specific time in advance so that we can be prepared.

冬至时间是固定的吗 怎么确定

is the time of the winter solstice fixed? The winter solstice solar terms

are the most important of the 24 solar terms of the lunar calendar in China. According to the Gregorian calendar, the winter solstice festival is on December 22-23 every year. On this day, the Sun runs to 270 degrees of the Yellow longitude, the latitude is the southernmost, the sun shines directly on the Tropic of cancer, the shortest day and the longest night in the northern hemisphere (it is night for 24 hours within the Arctic Circle). On the winter solstice, the height of the sun at noon in the northern hemisphere is also the lowest. For example, in Beijing, the height of the sun is only 26 ° 42 ', which is also called "long solstice" because the shadow at noon is the longest. Ancient China attached great importance to the winter solstice. It was stipulated that the month with the winter solstice was "ziyue", which was the first of the twelve Branches. Therefore, the winter solstice is still a traditional festival, commonly known as "winter festival", "long solstice" and other nicknames also have their own origins. How to calculate the time of the winter solstice of

and

the time of the 24 solar terms of

and

in China is divided according to the position of the sun in the ecliptic (that is, the earth's orbit around the sun). The sun starts from the vernal equinox (the Yellow meridian is zero degrees, and at this moment the sun shines vertically on the equator), and every 15 degrees forward is a solar term; It runs for a week and returns to the vernal equinox. It is a regression year, which is 360 degrees. Therefore, it is divided into two solar terms, while the solar yellow meridian is 270 ° at the winter solstice. On the day of the winter solstice, the sun almost shines directly on the Tropic of cancer. The northern hemisphere has the shortest day and the longest night. It begins to enter nine cold days. Astronomy stipulates that this day is the beginning of winter in the northern hemisphere. After the winter solstice, the direct position of the sun gradually moves northward, and the days in the northern hemisphere gradually grow, which is the same every year.

winter solstice farming activities

every year before and after the winter solstice is a good time to build water conservancy, vigorously carry out farmland capital construction and accumulate fertilizer. At the same time, we should apply winter manure and do a good job in antifreeze. The management of winter crops in Jiangnan area of China should be strengthened, ditches should be cleared for drainage, soil should be cultivated and roots should be blocked, and the hardening of winter soil that has not been ploughed should be promptly ploughed, so as to loosen the soil, enhance the capacity of water storage and water conservation, and eliminate overwintering pests. In the southern coastal areas where spring planting has begun, it is necessary to seriously do a good job in the cold prevention of rice seedlings and wear more clothes.

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