Why is the Yijing divided into upper and lower meridians?

Because he is arranged in the order of hexagrams, which refers to the order of sixty-four hexagrams. In order to remember, the ancients made up a divination overture: Gan Kun swallowed Meng Meng and needed a lawyer, but he was more humble than a small animal, and his colleagues were much prepared, eager to see and bite, and arrogant. Xianheng fled and became strong, and Jin and his family were in full view, so he solved the profit and loss, rose to the trapped well, shook the tripod, and gradually returned to his sister's abundant travel, which made him happy, but he was younger than Ji Ji, and it didn't help. For the next 34 years. The ancients believed that the arrangement of the sixty-four hexagrams in Zhouyi reflected the process of the emergence, development and change of the world, with Gan Kun as the head, symbolizing that everything in the world started from Yin and Yang of heaven and earth, as Yang and heaven. Kun is yin and earth. After Gankun comes Tun, Mong, Tun and Mong, which symbolizes that things have just begun and are in the period of Mongolian taste. ..... The scripture is finally moving away from the moon and the sun, which has a bright meaning, symbolizing that everything is vividly presented. Xia Jing began with Xian Heng, symbolizing the people, families and society that emerged after the creation of everything in the world. Xian means sympathy. Refers to sympathy for men and women, sympathy for marriage. Constant, permanent, refers to the husband and wife grow old together. After the formation of society, it was full of contradictions, and finally, it was Gigi. Gigi means success and completion. Poverty means that things are endless and endless. The author of Zhouyi tried to make the arrangement of the sixty-four hexagrams in Zhouyi conform to the evolution of the world.