How about nine days?

In China, 8 1 day from winter to the future is divided into 9 stages, each of which lasts for 9 days, which is called "Winter 99", which is often called "Nine Cold Days". Among them, the solstice from 0/9 to 27 days after beginning of winter every year is called "Sanjiu".

Three or nine days is the time when people feel coldest. Three or nine days is easy to calculate. Every year, on the day of winter solstice, you start counting to nine. After that, as long as you are familiar with the traditional solar terms in China, you will know the schedule of cold and heat.

This is: "1929, I stepped into my arms; 3949, frozen pigs and frozen dogs; 5969, look at the willows by the river; 79 ducks and 89 geese; 7963, pedestrian clothes list; 998 1 year, the elderly in Tian Zhongli cultivated land. " .

This means that because the earth has accumulated cold and hot energy some time ago, there will be 40 days of coldest weather from winter to the future; 18 solstice after beginning of winter, stiff hands and feet; The period from 18 to Sunday-36 days after beginning of winter is the coldest period in a year, which can freeze pigs and dogs to death.

Once winter comes to 18 days from 36 days to 54 days in the future, willows along the river will sprout new buds and the climate will get warmer; There is also the 54th day from winter to the 70th day, when people will take off their winter clothes. From winter to the next 70 days, spring ploughing will be ready and the weather will be completely warm.