What is "No.9"? Write the content and significance of the ninth song.

Jiujiu, also known as Winter Jiujiu, is a folk solar term in China. The number nine begins at the end of winter in 65438+February of Gregorian calendar and ends on Everyone's Day. "Liang Chao Shu Jing Chu Chun Qiu" records: "The winter solstice is 998 1 day, which is the end of cold." Counting nine cold days means counting nine days every nine days from the winter solstice to the eighty-first day of the ninth day, and the weather will get warmer.

Content of "Count Nine Songs": Don't shoot on September 19 and 29; Walking on the ice on March 9 and April 9; 59 and 69, watching willows by the river; Seven or nine rivers open, and eight or nine geese come; 99 plus 19, plowing cattle everywhere.

The meaning of "Counting Nine Songs" is to vividly record the changes of climate and phenology between winter solstice and vernal equinox, and express some laws of farming activities. "The Ninth Five-Year Plan" is a suitable solar term in northern China, especially in the middle and lower reaches of the Yellow River.