How did the ancients describe "If you don't take action in 1929, you will walk on the ice in 3949"?

The full text of the ancient poem "Nine Counts of Nine Ges":

One thousand nine hundred and twenty-nine did not take action, three-nine-four-nine walked on the ice, five-nine-sixty-nine watched the willows along the river, seven-nine the river opened, eight Nine wild geese are coming. Nine-nine plus one-nine, scalpers are plowing everywhere

Translation: In the first eighteen days after the winter solstice, the weather cools down rapidly, so cold that you can't put your hands outside. By the third and fourth nine days, each nine days is "one nine", the weather has reached the coldest time, even the river is frozen, and the surface of the river is frozen, and you can walk on it. By the fifth, sixth and ninth o'clock, the earth is gradually returning to spring, the willow trees are sprouting, and you can enjoy them.

Starting from the winter solstice, the rivers thawed for sixty-three days, and on the seventy-second day, the geese began to fly back from the south. The winter solstice begins and lasts for 90 days, which is when farmers start plowing the fields and preparing to sow.

Extended information:

1. Jiujiu Ge uses the form of songs to vividly record the changes in climate and phenology between the winter solstice and the next spring equinox. It also describes some laws of agricultural activities.

2. In traditional Chinese culture, nine is the ultimate number, which is the largest, most numerous and longest-lasting concept. Nine nines or eighty-one is the "biggest" number. Ancient Chinese people believed that spring had definitely arrived on the 81st day after the winter solstice.

From the winter solstice on Renri, China has entered nine cold days. Astronomy experts said that "Jiujiu" is a solar term that is more suitable in northern my country, especially in the middle and lower reaches of the Yellow River.