What do the solar terms of Jiujiu songs mean?

Jiujiu Song: 1929 Warm; 3949 frozen face; 5969 When the river overflows, dogs eat white bread. 7989 people look at willows; Ninety-nine plus nineteen plowed cows everywhere.

Note: it means that the weather is cold, the river is frozen, and the river overflows the ice surface and freezes again; Overflow and then freezing, freezing and then overflowing, repeated, the river surface forms a concave-convex ice surface several times wider than the normal water surface in spring, summer and autumn.

It is generally believed that it is extremely cold in winter, extremely hot in summer and extremely hot in climate, so that crops will grow particularly vigorously and the harvest will be particularly good. In the past, farmers had a hard life, and raising dogs only allowed them to eat wheat bran. "White flour buns that all dogs eat" is an exaggeration to describe the bumper harvest of crops and the ample food and clothing of farmers.

Extended data:

There is a saying "Jiujiu" in the China lunar calendar, which is used to calculate the seasons. The calculation method starts from the winter solstice, and the first nine days are called "September 19th". The second nine days are called "29", and so on until "99". That is, the ninth nine days, winter has passed and spring has arrived.

The custom of old Beijing is to draw a "map of cold in September and September" from the solstice of winter, which has been recorded in the works of Ming Dynasty. This picture is a plum blossom picture, which depicts a plum blossom. It has 8 1 petal (representing 998 1 day).

Dye a petal with a pen every other day. After 8l days, 8 1 petals have all been dyed, and spring has arrived, so it is called "99-99 Cold Relief Map". Moreover, in Beijing in the Ming Dynasty, there was a relief map engraved with "99 Cold Land", which was sold in the market, which was more convenient, and there was a "99 Song" next to this map.