How did the ancients describe "1929 did not shoot, but walked on the ice in 1949"?

/kloc-I didn't do it in 0/929. I walked on the ice in 3949, watched the willows by the river in 5969, opened the river in 79, and accompanied the geese in 89. 99 plus 19, cattle plow everywhere.

It's only from winter to the first 18 days in the future that the weather gets cold quickly and it's too cold to be outdoors. On the third and fourth nine days, every nine days is "September 19". The weather is coldest, and even the river is frozen, so you can walk on it. By the fifth, sixth and ninth hours, the earth is gradually rejuvenating and willows are sprouting, so you can enjoy them to your heart's content.

From the solstice of winter, the river thawed for sixty-three days, and on the seventy-second day, geese began to fly back from the south. There are still 90 days before the winter solstice, that is, the time for farmers to start plowing and prepare for sowing.

Extended data:

1, Song No.9 vividly records the climate and phenological changes between the winter solstice and the vernal equinox in the form of songs, and also expresses some laws of agricultural activities in the same answer.

2. In the traditional culture of China, nine is the extreme number, the largest, longest and longest concept. Nine nines is eighty-one, which is the "maximum" number. People in ancient China believed that after the solstice on September 8 1 day, spring must have arrived.

It has been a cold day in China since the winter of November. Astronomical experts say that the Ninth Five-Year Plan is a more applicable solar term in northern China, especially in the middle and lower reaches of the Yellow River.