When does the weather get longer during the day?

The solstice of winter begins, and the days get longer and longer.

The solstice in winter is the day when the sun reaches the tropic of Capricorn. The shortest day and the longest night. After the solstice in winter, the days get longer and longer. After a period of severe cold, the weather will gradually get warmer. Therefore, since the Xia Dynasty, people have taken the winter solstice as the starting point of solar terms. At the latest in Shang Dynasty, China people had determined the date of winter solstice by measuring the shadow in the standard table, but there would be an error of two to three days.

Pay attention to the winter solstice, because the winter solstice and summer solstice are the key to making a calendar, and the calendar is accurate. Measurement can prove that the emperor has mastered the destiny and is qualified to cope with the weather, so it is particularly valued. During the Zhou Dynasty, on New Year's Day, which took the winter solstice as a year, the Duke of Zhou stipulated in Zhou Li that the winter solstice should be used to worship gods, ghosts, five emperors, the sun, the moon and the stars on the suburban altar. There are also folk activities in the suburbs that make use of the winter solstice to worship heaven.

Astronomy talks about the winter solstice;

Astronomy regards the winter solstice as the beginning of the cold winter climate, which is obviously late for most parts of China. The northwest wind in Shi Yun invaded Baicao, and it was cold and sunny several times. The daytime is the shortest, but Jinmei is blooming brilliantly. In all parts of the northern hemisphere, the winter solstice is the shortest day in a year. After the winter solstice, the direct point of the sun gradually moved northward, the days in the northern hemisphere began to get longer and the height of the sun gradually increased at noon.

Therefore, as the saying goes, eating noodles on solstice in winter will make the day longer. From the climate point of view, during the winter solstice, the average temperature in the northwest plateau is generally below 0℃, and it is only about 6℃ to 8℃ in the south. In addition, the winter solstice begins to count to nine, and the winter solstice becomes the first day to count to nine. As for the number nine, the folk song goes like this: don't do it in September, walk on the ice in March and April, see willows along the river in May and June, open the river in July and September, geese come in August and September, and walk everywhere in September and April.