Why is the 10th day of February called Jiujiu?

There is a saying in the traditional culture of China that it is hot in dog days and cold in three or nine days. The specific calculation method is that every ninth day starts from the winter solstice, and the first nine days are called "Yijiu" and the last nine days are called "Erjiu", and so on, counting to "999" and "999".

On the ninth day, usually after the fright, before the vernal equinox, around the fourth solar term of the 24 solar terms, the sun is located at the longitude of 0 of the Yellow River, the bucket handle of the Big Dipper points due east, and the five elements belong to wood, representing hair growth, which is the real starting point of a round year.

folk song

"99" is the product of farming society, with a long history, which has been passed down from mouth to mouth among the people. It is a summary of the experience of ancient people in production and life practice from generation to generation, using some ecological reflections and meteorological signs in nature. It is quite scientific and still plays a guiding role in the arrangement of people's production and life, so it has been popular and widely circulated in people's mouths and reflected in people's behavior.

China folk widely circulated "99-year-old songs to relieve cold", commonly known as "99-year-old songs". There are many versions of 99 ballads. Version examples: 1929 did not shoot, walked on the ice in 3949, watched willows along the river in 5969, opened the river in 79, swallowed it in 89, and added 19 in 99, plowing cattle everywhere.