Why did Kun hexagrams start from unitary instead of sea?

The external divination is ugly, and the internal divination is linked with B, all of which are reversed, and the yang is smooth and the yin is reverse. The first hexagram is not started, and the last six hexagrams are closed. You don't understand the order.

Take Jia as the two endpoints of yang, accept Jia in the trunk and accept it outside; The inside of Kun is the outside of Gui, and the head and the end of Yin stem are the two endpoints of Yin hexagrams.

Na Zhi's theory of twelve Chen is based on the solar terms, that is, the old Yang Kun is old and Yin and Yang are born in the meridian, and You Mao is changed to the first day of Dongzi, so the first day of the year begins with Zi; Yin gave birth to the afternoon moon, and the afternoon sun pushed the next time. It was not Yin, and Kun began at the beginning. As for the reasons for the complicated melody, I recommend going to see Jing Fang Yi Zhuan.