Why does "99 Songs" need to add nine days to nine days?

Among 99 songs, 99 plus 9 days is the vernal equinox.

Jiujiu Song, also known as Jiujiu, is a folk solar ballad in China, which started from the winter solstice in late February of 65438 in the solar calendar every year. According to the annual solar terms division chart below, 90 days after the winter solstice is the vernal equinox season.

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multiplication table

The widely circulated "99-99 Xiehan Song" from winter solstice, commonly known as "99-99 Song", vividly records the climate and phenological changes between winter solstice and vernal equinox, and also expresses some laws of agricultural activities. In the traditional culture of China, nine is the extreme number, which is the largest, largest 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.

"Liang Chao Shu Jing Chu Chun Qiu" records: "The winter solstice is 998 1 day, which is the end of cold." Count nine cold days, that is, count nine every nine days from the winter solstice to the eighty-first day, and the weather will warm up. In fact, it is "99-99, plowing cattle everywhere"-90 days, which is 9 days.

The most popular 99 songs are as follows: