What is the origin of the winter solstice in the 24 solar terms?

For thousands of years, the winter solstice has been a very important festival, and only some places have maintained the festival tradition, and gradually it has only become a simple solar term. On this day, the climate is getting colder and colder. Then, this issue of the Old Yellow Calendar will show you the origin of the winter solstice in the 24 solar terms.

The origin of the winter solstice in the twenty-four solar terms: the winter solstice festival originated in the Han Dynasty, flourished in the Tang and Song Dynasties, and has continued to this day. Lu even said that the winter solstice is as big as a year. This shows that the ancients attached great importance to the winter solstice. People think that the winter solstice is a natural transformation of Yin and Yang and a blessing from heaven. In the Han Dynasty, the winter solstice was the "Winter Festival", and the government held a congratulatory ceremony called "He Dong", which was a routine festival.

The winter solstice is the earliest of the 24 solar terms, which was determined according to the astronomical phenomena in ancient times. On the day of winter solstice, the sun moves to 270 degrees of the yellow meridian (winter solstice), and the position of the sun directly on the ground reaches the southernmost point of the year. The sun is almost direct to the Tropic of Capricorn (also known as the winter solstice daily line), and the sun is most biased towards the northern hemisphere.

Therefore, in all parts of the northern hemisphere, the winter solstice is the shortest day in a year, and the farther north, the shorter the day. North of the Arctic Circle, the sun is below the horizon all day, which is the widest day of the year in the northern hemisphere. For all parts of the northern hemisphere, the winter solstice is also the day with the lowest sun height at noon all year round. As far as Beijing is concerned, the daytime from winter to sunrise is only 9 hours and 20 minutes, and the height of the sun at noon is only 26 42'.

During the winter solstice, the northern hemisphere gets the least solar radiation, about 50% less than the southern hemisphere. The winter solstice is a sunny day, and the new year begins. "Collection of Re-Classics Hall" records: "Summer solstice and autumn equinox, spring to winter solstice", and the winter solstice festival is also the first sound of spring. After the winter solstice, the stars in the night sky are completely replaced by the stars in winter. From today, they will enter the ninth. At this time, the southern hemisphere is in a hot summer.

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