Why is the winter solstice not counted according to the lunar calendar? Is there a fixed date?

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The solar term of the winter solstice is calculated according to the solar movement cycle, so it is necessary to use the same basis as the sun Run the cycle to customize the solar calendar, that is, the Gregorian calendar to calculate.The traditional lunar calendar is customized according to the movement of the moon, which obviously cannot accurately express the exact time of the winter solstice.

Introduction to the winter solstice

The winter solstice is the shortest day of the year in the northern hemisphere, and the day gets shorter as you go north.North of the Arctic Circle, the sun is below the horizon all day, making it the most polar night of the year in the northern hemisphere.For the rest of the Northern Hemisphere, the winter solstice is also the day with the lowest midday sun of the year.The winter solstice is cold and freezing, and there are fewer outdoor activities, and people spend more time at home to rest.The winter solstice has become a festival for visiting relatives and friends."Fat winter thin year", in the folk, winter solstice solar terms also hold winter celebration and winter worship activities, such as the winter solstice festival in November lunar calendar, worship family temples, blessing temples, worship parents and elders, and hold family banquets to congratulate relatives.The custom of eating dumplings on the winter solstice is widely spread among the people.

Time of the winter solstice

The winter solstice is the 22nd solar term in the 24 solar terms in China, when the sun reaches the ecliptic longitude 270°.The "Copyon of the Constitution" records:"The arrival of the cathode, the beginning of yang, the arrival of the sun in the south, the arrival of the short day, and the arrival of the shadow of the sun, so it is called the winter solstice." longest.As early as the Spring and Autumn Period more than 2,500 years ago, China has used Tugui to observe the sun and determine the winter solstice.It is the earliest one of the twenty-four solar terms, and the time is from December 21 to 23 of the annual Gregorian calendar.day.

Climatic characteristics of the winter solstice

1.The sunshine is getting longer and longer

The ancient poem has a cloud, "The northwest wind hits all the grasses, and the sun rises several times.The most is that the time is short, but the golden plum blossoms are blooming." The winter solstice is the shortest day of the year in all parts of the northern hemisphere.After the winter solstice, the direct point of the sun gradually moves northward, the day in the northern hemisphere gradually becomes longer, and the height of the sun at noon gradually increases.Therefore, there is a saying, "Eating the noodles on the winter solstice, one day grows a line."

2.The temperature drops

After the winter solstice, the climate in all parts of China will enter a coldest stage.That is, people often say "into the nine" and "count the nine cold days".The so-called "number nine" means that from the winter solstice, nine days are a unit, which is called "nine".After nine "nine", it is exactly eighty-one days, which is "out of nine" or "end of nine"..Counting from "nine" to "nine-nine", the cold winter turns into the warm spring.

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