What does it mean to get up on the ninth day of winter solstice?

The solstice of nine days from winter is nine days from the solstice of winter, that is to say, it is nine days. There is a traditional custom in China. The solstice in winter begins on the 9th, which shows that winter is getting colder and colder. The winter solstice is the most critical solar term in the transformation of Yin and Yang. Nine is the largest positive number in the number, counting nineteen, twenty-nine, etc. In winter, the yin gradually decreases, and the yang gradually rises until you are tired. From the meteorological point of view, there will be a cold wave every nine days, and it often happens in the last day or two of the first nine. Psychologically, the homonym of "nine" and "long" means that winter is very long, and we look forward to the early arrival of spring. The first nine days from winter to the future are September 19, the last nine days are February 29, and so on, all the way down.