Which season does the semi-year refer to?

The child year refers to the winter solstice.

Child years old means the first year (New Year's Day) next to a year. In ancient times, the winter of solstice was called sub-year-old at 4: 08. The solstice in winter is considered as a big holiday in winter. In ancient times, people wandering in other places had to go home for the winter festival at this time, which was called "having a home at the end of the year".

In our country, the saying that "the winter solstice is as big as a year, and I will never return to my ancestors" is widely circulated among the people. The winter solstice is called "sub-year" and "off-year", which means that a year is coming, and the winter solstice is very important. When the winter solstice arrives, the New Year is just around the corner, so the ancients thought that the winter solstice was as important as the New Year.

Extended data:

The arrival of winter solstice solar terms marks the beginning of winter. On this day, although the northern hemisphere received the least solar radiation, it was about 50% less than the southern hemisphere. However, this is not the coldest time, so-called "March 9, April 9 cold." This is because there is atmosphere and water on the surface of the earth, which can store heat, not "save or lose" but "accumulate heat"

Therefore, the weather is usually not very cold before the winter solstice. From winter to the future, although the solar altitude angle gradually increases, it is a slow recovery process, and the heat lost every day is still greater than the heat received, showing a situation of "making ends meet". On the day of "March 9 and April 9", the accumulated heat is the least, the temperature is the lowest, and the weather is getting colder and colder.

Baidu encyclopedia-Asian years old

Baidu encyclopedia-winter solstice