What is the relationship between the return of one Yang and solar terms?

"The return of one sun" is related to the solstice in winter.

The ancients believed that there was yin and yang between heaven and earth, and every year until the summer solstice, the yang was exhausted and the yin was born; On the solstice of winter, Yin Qi dried up and began to recover, which is called "the return of one sun".

In the lunar calendar, November belongs to divination. The drawing method of complex hexagrams is that the bottom one is Yang hexagrams and the top five are Yin hexagrams. It means that the sun's spirit begins to recover, and it changes from interest to elimination.

Solar terms are heavy snow and winter solstice. Winter, winter has arrived, but it is also yin that gives birth to yang, and it will turn to spring soon. But why is it still so cold? Because this is only an internal change, it has not been shown to the public. Well water is warm in winter, precisely because the cathode inside is the positive electrode. Six hexagons are divided into inner hexagons and outer hexagons. From bottom to top, three are internal, and four to six are external. Internal divination is an internal change, and external divination is that this change has already appeared to the outside.

Winter solstice:

Winter solstice (alias: 1999, Winter Festival, Dragon Festival, Asian Year, English name: Winter solstice) is the 22nd solar term in the "24 solar terms", the longitude of the sun reaches 270 degrees, and the date falls on the 22nd or 23rd of February in the Gregorian calendar every year, which is a traditional festival of the Chinese nation. The custom of winter solstice originated in Han Dynasty and flourished in Tang and Song Dynasties.

The solstice in winter is the extreme point of direct sunlight spreading to the south. From winter to the sun, the sun shines directly on the tropic of Capricorn, and the sun is most inclined to the northern hemisphere, and the elevation angle of the sun is the smallest. In all parts of the northern hemisphere, the days are the shortest and the nights are the longest.

The solstice in winter is also a turning point for the sun to return directly to the north. After this day, there will be a "turn back", and the direct point of the sun will move northward from the tropic of Capricorn (23 26' s), and the daytime in the northern hemisphere will increase day by day. The winter solstice marks the beginning of the cold season, so people begin to count nine to calculate the cold weather (folk proverb: "The summer solstice is three Geng, and the winter solstice is nine for everyone).

There is a folk proverb that "the solstice in winter is as big as a year", but during the solstice in winter, different places have different customs. Most northerners eat jiaozi, while most southerners eat jiaozi.