What do you mean by yin and yang?

Yi Yin is an old yin, which is represented by "-",while Yang Yi and Lao Yang are represented by "-".

In the eight diagrams, a horizontal "-"is positive, and a horizontal "-"is intermittent. If it's yang, it starts at nine, and yin starts at six, but the first one puts ninety-six behind, so if it's all yang, it's the ninth day, the second day and the third day. Full yin is the sixth day, the second day and the third day. Others can be pushed out.

Divination is the basic element of the Book of Changes.

Divided into (-) and (-), the three hexagrams overlap to form eight diagrams, that is, dry (three-yang hexagram), Kun (three-yin hexagram), earthquake (lower yang hexagram and upper two-yin hexagram) and hexagram.

Eight trigrams overlap again to form sixty-four hexagrams. For example, the "Thai" of Jitai is Shangkun and Xiakun, so "no" means Shangkun and Xiakun; Each hexagram has six hexagrams. Classics include four parts: divinatory symbols, divinatory symbols, divinatory symbols and divinatory symbols. Gua Ci is to explain the meaning of all hexagrams, and Yi Ci is to explain the meaning of each hexagram.