What is "1999 solar term song"?

1999 solar term song: 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 plowed cattle everywhere in 99 and 19. "

Of course, due to the different climate, there are some differences in Jiujiu songs, but no matter what the differences are, they vividly record the changes of climate and phenology between the winter solstice and the vernal equinox, and also express some laws of agricultural activities.

The Ninth Five-Year Plan is more suitable for northern China, especially the middle and lower reaches of the Yellow River. It can be regarded as a kind of "miscellaneous solar terms" other than the 24 solar terms, also called "Winter 99". Chinese traditional cultural concept holds that "nine" is the concept with the largest number, the largest number and the longest length. "Counting nine" begins on the day of winter solstice, and then it is called "nine" every nine days. Nine nines is considered as the maximum number. Solstice begins in winter and passes 998 1 day, which is called "out of nine". Ancient working people thought it was time to warm bloom in spring, so there was a saying that "nine flowers bloom in nine".