What does seventy-two wait mean?

The Seventy-two Seasons is a supplement to the calendar used to guide agricultural activities in ancient China. It is compiled according to the geography, climate and some natural scenes of the Yellow River Basin, with five days as the weather, three days as the weather, six days as the weather, four years as the age, and "twenty-four solar terms" * * * 72 days a year.

Each climate corresponds to a phenological phenomenon called "waiting". Among them, the plant climate should be germination, flowering, fruiting, etc. Animals should start vibrating, singing, mating, migrating, etc. Abiotic climate should include initial freezing, thawing and thunder. The time series changes of 72 climaxes reflect the general situation of phenology and climate change in a year.

There should be two types of climaxes: one is biological orgasm, in which animals, such as geese, cicadas and earthworms come out. There are also plants, such as peach blossoms, Pingshisheng, and Henaiden. Another kind of abiotic climate is a natural phenomenon, such as water freezing, thunder, soil wetting and intense heat. , its content is very extensive.

But there are also some mistakes, which are not in line with scientific facts, such as the eagle turning into a dove and the bird turning into a clam when entering the water. And there are some things that don't conform to the meaning of solar terms, such as the cool wind, dew and chilling sound in the dog days before summer. Because the waiting time unit is small (once every five days) and the climate is quite different in different years and regions, it is difficult to be widely used.