In the Yin period, what belongs to Yin is

The period of yin belonging to yin is the first half of the night.

Generally speaking, the nature of yin and yang in day and night is: the morning belongs to the yang in the yang, the afternoon belongs to the yin in the yang, the first half of the night belongs to the yin in the yin, and the second half belongs to the yang in the yin.

Yin-yang theory:

Yin and Yang is a simple and broad philosophy in ancient China.

The philosophy of Yin and Yang has three characteristics: unity, opposition and mutual transformation. In thinking, it is an inseparable metaphysical node between calculation (arithmetic) and divination (logic). Biological genes in nature and duality in artificial intelligence fully show the vitality of Yin and Yang.

Yin and Yang are the descriptions of the fundamental factors hidden behind the laws of nature and promoting the development and changes of the laws of nature in ancient China. They are the motive force for the gestation, development, maturity, decline and even extinction of all kinds of things, and are the core elements to lay the foundation of logical thinking of Chinese civilization.

Generally speaking, according to Yi-ology, it describes the most basic elements of the universe and their functions, which is one of Fu's basic concepts.

Yin and Yang collide with each other, and everything in the world has a way of Yin and Yang. You can feel a trace of yin and yang from everything. The ancients and later generations all understand, and there are different opinions. Because everything in it exists in the way of yin and yang, all kinds of academic circles in ancient and modern times have its shadow.

The word yin and yang represents many meanings and truths, which can be simply divided into: opposition of yin and yang, collision of yin and yang and transformation of yin and yang.