What does "five grains" mean? What does "six animals" mean? What does the "eight characters" in "birthdates" mean?

The general term for five grain crops. The theory of "five grains" appeared in the Spring and Autumn Period and the Warring States Period. The Analects of Confucius: "Four bodies are not diligent, and five grains are not divided". However, the explanations are different. One is millet, millet, wheat, rice; One is millet, millet, wheat, rice and hemp. The main difference between these two statements lies in the existence of rice and hemp. The reason for the disagreement is that there were more than five kinds of crops at that time. The existence of the theories of "1-grain", "six-grain" and "nine-grain" is a clear proof, and the varieties of crops vary from place to place. The reason for the popularity of the "five-grain" theory is that Grains refer to several main food crops. As mentioned in the Three-Character Classic of Six Livestock: horses, cattle, sheep, dogs and dogs (that is, pigs), these six animals are fed by people. The eight characters are: the year, month, day and hour of birth, which are generally based on the lunar calendar, that is, they are arranged by heavenly stems and earthly branches. For example, it is 19 o'clock on November 27, 25 (the lunar calendar).