You have been counting nine since the solstice of winter. Do you know the meaning of counting to nine?

The number nine is synonymous with the coldest period of agricultural society in China, starting from winter to Sunday, after 998 1 day, until the vernal equinox. Why take nine as the cycle? Because it is the largest positive number, which means it is difficult to be repeated and irreversible. Nine represents the coldest, and three volts in summer represents the hottest. In fact, we can see the dialectical philosophy of China people these days. In fact, in the coldest season of 3949, climate change was like a parabola with normal distribution. Why was the weather coldest in 3949? Have you ever thought about it? This involves knowledge of astronomy. In winter solstice, the sun is far from the ground, so it is reasonable to say that there is a lot of heat. But because there is more water in the air, it can save some heat, so the temperature will not drop too much. On the contrary, after March 9, the air is dry, the water is low, and the heat can't be stored, so the temperature will drop even more. By the way, on the solstice in winter, the days are short and the nights are long, and the longitude of the sun is 270 degrees. What the hell do you mean? The most important function of ancient people's observation of climate is to guide production and life. For example, there is a folk proverb: 1929 don't make moves, 1999 walk around. In other words, at the beginning of the winter solstice, you just rest for health and store winter food. By the time spring blooms in 1999, agricultural production can be started. Because you are good at observing nature, there is a saying that you will walk on the ice in 1999, and you can exercise and accumulate yang at this time.