Is the calculation of divination phase based on hexagrams or hexagrams?

The hexagrams are not based on hexagrams, nor are they based on rhetoric, but they are broken by the constraints of the sun and the moon. You said that when there was no divination at the earliest, it was the oldest prediction method with low accuracy. You don't use your mind, even if you read the hexagrams, you don't know how to read them. Because hexagrams are composed of six hexagrams, they are also called six hexagrams, which is far from the real six hexagrams. Sixty-four hexagrams in Zhouyi have existed since Zhou Wenwang, and six hexagrams were created by Fang Jing in the Han Dynasty, which is totally different.