What's the matter with "regulating Yang by law"?

What's the matter with "regulating Yang by law"? Details are as follows:

Leap into age? Administer yang according to law.

Athena Chu: Karen? yú？ chéng？ suì？ lǜ？ lǐ？ Theo? Yang.

Interpretation: Accumulate the leap surplus of several years into one month and put it into leap year; The ancients used six laws and six laws to regulate yin and yang.

Source: The phrase "Leaping into the Era" comes from Shangshu? There is a saying in Yao Dian: "The age is set at four o'clock in the leap month".

"Year" and "Year" are two concepts of "leap into maturity". Year refers to the natural year from the first day of the first month of this year to the first day of the first month of next year. Years old refers to the period from one solar term this year to the same solar term next year, that is, the year of the tropic of cancer.

The original meaning of the year old is the year old star, not Jupiter, and Jupiter's trajectory is called Tai Sui. Chronology is another astronomical calendar in China. Jupiter12 revolves once a day, 30 degrees a year, which is an age. Use it to record historical events, just record it as: years old in XXX. The solar calendar records the year, and the ephemeris records the year, so that the years are consistent. This is "leap into adulthood".

The leap problem has been solved, and the calendar can finally match the four seasons in theory, but can the calendar match the climate and actual phenology of the four seasons, that is, the 24 solar terms? It depends on temperament to correct and adjust. What is Lu Lu? Rhythm is a kind of equipment used to coordinate yin and yang and calibrate temperament, which is called tuning tube in modern music.

There are five tones in China ancient music, and the right tone in the upper corner of the palace is five full tones, plus two semitones, one is four, one is seven and the other is seven. These seven sounds are an octave natural scale, and there is no pitch, that is, there is no pitch. What do we do? We should use temperament to set the tone for it. Temperament is called Fa Guan and Lu Guan.

Linglun in the era of the Yellow Emperor used twelve bamboo tubes, the longest being nine inches, and the shortest being four inches and six minutes, because nine was the pole number of Yang. Then arrange the bamboo tubes in order of length, with the upper nozzle on one side flush and the lower nozzle of different lengths, like cutting green onions, leaving oblique stubble and inserting it into the soil. The bamboo tube is empty, and it is filled with ash burned with reed film. This kind of fly ash is the lightest, which is called leisure time. Bury these pipes in the shady mountain in the northwest, cover them with a cloth curtain and build a room outside. There is absolutely no wind blowing, so use them to wait for the earth's atmosphere, because the yin and yang in the underground are changing at any time.

Speaking of the solstice in winter, the sun shines brightly. Sun be the spirit throughout his life, the ash in the first nine-inch long pipe called Huang Zhong flew out on its own and made a "buzzing" sound at the same time. This kind of sound is called the yellow bell, which is a child at this time and the solar term is the winter solstice. Use this sound to set the key, which is equivalent to the c key of modern music; At the same time, a time can be set to adjust the change of phenology, so it is called "rhythm yang regulation"