Calendar matching of twelve laws

Because there are twelve rhythms in a year and minutes in a month, in ancient China, people associated the twelve rhythms with December. According to the records in the Book of Rites, the corresponding relationship between them is:

The moon in Meng Chun, the law is too cluster;

Zhong Chunyue, the clock is in the law;

The moon in Ji Chun, a nun in law;

In the summer dream, Lu is in the law;

The midsummer moon is full of guests;

The moon in summer, the bell of law;

The moon in Qiu Meng, the law is in the middle;

Mid-autumn moon, south of Fallow;

Season and autumn moon, the law has no shooting;

In the month of Meng Dong, the bell should ring in the law;

Midwinter moon, yellow bell in France;

The moon in winter, the great Lu Zaifa.

The so-called "harmony in melody" is "correspondence in melody", and its verification method is based on "blowing away dust" It is said that the ancients stuffed hardened ash into twelve pipes, and as long as it reached a certain month, the ash in the corresponding pipes would fly out automatically. This is the allusions of words such as "Blow away the dust and wait for the air" and "Easy to be the law of July". Of course, from today's point of view, waiting for the weather has no realistic basis.

It is worth noting that the most basic of the twelve laws is the yellow bell, while the most basic of the China calendar is the month with the winter solstice. What is listed in "Moon Order" is the mid-winter month-sub-month (1 1 month), in which the yellow bell corresponds to the winter solstice. In fact, the twelve laws are indeed related to the measurement ratio of astronomical solar terms and shadow length. (Refer to the intersection of Twelve Methods and Huangchi in Tracing the Origin of Ancient Space Culture in China)