What is the sentence "Look at Liu Xia along the river" in 5969?

The next sentence is 79 rivers open and 89 geese come.

This sentence comes from the famous folk song "Counting Nine Songs".

Complete sentence:

1929 didn't shoot, walked on the ice in 3949, watched the willows along the river in 5969, opened the river in 79, brought geese in 89, and added 19 in 99, plowing cattle everywhere.

Introduction to the number nine:

China has been in cold weather for several years since the winter of November. Astronomical experts said 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.

From the day of winter solstice, it entered the "number nine", commonly known as "cross nine", and then every nine days as a unit, called "nine". After nine "nines", it is exactly eighty-one days, that is, "nine out", and then spring blossoms.