Winter Solstice, yesNorthern HemisphereIt is a day with the shortest day and the longest night, and the shorter the day goes north,arcticappearPolar nightPhenomenon.Winter SolsticesunlightDirect projectionTropic of Cancer, the sunlight is most inclined to the Northern Hemisphere,Solar altitude angleminimum.The winter solstice isSubsolar point The turning point of southward return. After that day, it will take a "turning back". The direct sunlight point will start to move northward from the Tropic of Cancer, and the days in the Northern Hemisphere will increase day by day.[1]
From the perspective of the law of solar terms, the beginning of spring is the starting point of the rising of yang qi in the "yin and yang" qiYin Yang transformation, Yang Qi rises, and the beginning of spring marks the beginning of a new cycle and the rebirth of all things;And the winter solstice is the sunreturnThe starting point of, from the winter solsticeSolar altitudeThe winter solstice marks a new cycle of direct sunlight movement and the day grows day by day. The ancients also regarded the winter solstice as a "auspicious day".[5]
Chinese name
Winter Solstice
Foreign name
Winter Solstice
Alias
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Holiday time
December 21, 22 or 23 of each year
Festival type
traditional festival
Epidemic area
China
Origin of festivals
The 22nd of the 24 solar terms and the fourth in winter[4]
December 21-23 of the Gregorian calendar every year,Subsolar point Travel southward to the extremesunlightDirect projectionTropic of Cancer(23 ° 26 ′ S), the sunlight is most inclined to the northern hemisphere,Solar altitude angleThe smallest day is the shortest day and the longest night in the Northern Hemisphere.The winter solstice is also the turning point for the return of the solar direct point to the north. After that day, it will go back, and the solar direct point will begin to move northward from the Tropic of Capricorn,Northern Hemisphere(China is located in the northern hemisphere) The day will increase day by day.
Although the days in the Northern Hemisphere are short on the winter solstice, the temperature on the winter solstice is not the lowest;It will not be very cold before the winter solstice, because there is still“Accumulated heat"The real cold winter comes after the winter solstice; due to the great difference of climate in different parts of China, the climate characteristics in the sense of astronomy and meteorology are obviously late for most regions of China.[6]
Definition of name
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Winter Solstice
The winter solstice is the solar term reflecting the return movement of the direct sunlight on the earth's surface.The winter solstice, when the sun goes southward to its extreme, is the day with the shortest day and the longest night in the Northern Hemisphere.Since that day, the direct sunlight point returns to the north, and the sunlight in all parts of the Northern Hemisphere (China is located in the Northern Hemisphere) becomes stronger and stronger, and the day grows day by day.The winter solstice is the turning point of "daily travel to the south and return to the north". For all parts of the Northern Hemisphere,Solar altitudeSince then, the sunlight has gradually increased.The winter solstice is the beginning of the rise of the sun's height, indicating that the direct sunlight movement has entered a new cycle.Therefore, the ancients regarded this day as a "auspicious day".[2]
Other related
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On the "winter solstice", the sun directly shines on the Tropic of Capricorn, and the northern hemisphere has the least sunshine and the shortest day.Since then, although the nights have become shorter and the days have become longer, the surface heat accumulation has become less and less. The arrival of the coldest "nine cold days" in a year requires ninety-nine eighty-one days before spring can return to the earth.[3]
Winter SolsticeIt is the solar term that reflects the return movement of the direct sunlight point.In the shopIt is said that "one sun rises on the winter solstice".In fact, strictly speaking, "yang" has the concept of "yang" and "yang of the sun".After the winter solstice, the sun's height rises, not the yang qi in the concept of "yin and yang".The Yang in the "Winter Solstice is the Yang of the sun, not the Yang of the Yin and Yang." They are different concepts.The winter solstice solar term reflects the offset law of the direct sunlight point on the earth's surface. The arrival of the winter solstice solar term indicates that the solar height is the smallest and the days are the shortest in all parts of the northern hemisphere, not the day with the most yin in the concept of yin and yang.“Yin Yang and Five Elements”It belongs to the category of "trunk and branch", and the growth and decline of "yin and yang" is based on "trunk and branch", not on the offset of direct solar radiation point.From the perspective of the law of solar terms, the beginning of spring is the starting point of the rising of yang qi in the "yin and yang" qiYin Yang transformation, Yang qi rises;And the winter solstice is the sunreturnFrom the beginning of the winter solstice, the sun returns to the north, and the days around the Northern Hemisphere increase day by day.The winter solstice belongs to the solar term reflecting the movement law of the direct sunlight point. Since the winter solstice, the sun's height has risen, the sunlight has become stronger, and the days have become longer and longer.[4]
The following table shows the day length andNoon sun height。It can be used as a reference when traveling.
