When is three nine four nine?

The so-called "Sanjiu" refers to the day from 19 to the 27th after beginning of winter. April 9th refers to the 28th to 36th days after beginning of winter.

In other words, "Nine" is a concept of time. March 9 and April 9 are the coldest days of the year.

On the solstice after winter, there are 40 days of cold weather all year round. /kloc-the winter solstice after 0/8 days, with stiff hands and feet,/kloc-the winter solstice after 0/8 days-/kloc-the winter solstice after 0/8 days, which is the coldest period of the year, the river freezes and the river is blocked; 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; From the 54th day to the 63rd day after winter solstice, swallows fly back to the north from the south. 63-72 days after the winter solstice, spring ploughing is ready and the weather will be completely warm.