The origin of the winter solstice of the 22nd solar term in 24 solar terms and the change of solar height.

The origin of the 22nd solar term winter solstice in 24 solar terms.

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The origin of the winter solstice of the 22nd solar term in 24 solar terms and the change of solar height.

The origin of the 22nd solar term winter solstice in 24 solar terms.

The winter solstice originated from China's concept of Yin and Yang. Yin and Yang symbolize the balance and coordination of life. China people believe that when the winter solstice comes, it is the time when the dark power and coldness of Yin are the strongest, and it is also an extremely important critical moment, because the light and warmth of Yang will gradually ban the extreme coldness of Yin. Therefore, the solstice of winter is a harmonious and happy moment. The ancients believed that by the solstice of winter, although it was still in the cold season, spring was not far away.

The winter solstice is a very important solar term, and it is also a traditional festival in China's lunar calendar. Up to now, there are still many places where the winter solstice festival is held. The winter solstice is commonly known as "Winter Festival", "Dragon Solstice Festival" and "Asian New Year Festival". As early as 2500 years ago, during the Spring and Autumn Period, China had determined the winter solstice by observing the sun through the soil return, which was the earliest of the 24 solar terms. The time is between February 22nd and 23rd of Gregorian calendar 12.

Variation law of solar height in winter of solstice

1. In the whole southern hemisphere or northern hemisphere, the noon sun height angle can reach the minimum value of the whole year at the same time (from winter to Sunday in this hemisphere), but it cannot reach the maximum value of the whole year at the same time;

2. In the area between the Tropic of Cancer and the Tropic of Cancer, the direct sunlight reaches the annual maximum, instead of the summer solstice in this hemisphere;

3. The maximum value (hemisphere summer solstice) and minimum value (hemisphere winter solstice) on the tropic of cancer once a year; The area between the Tropic of Cancer and the Tropic of Cancer has a maximum twice a year (when the sun is in direct sunlight) and a minimum once a year (winter solstice in this hemisphere), but the equator has two times a year;

4. Outside the Tropic of Cancer, the maximum (summer solstice in the hemisphere) and the minimum (winter solstice in the hemisphere) appear once a year.