What do the first nine, the last nine, the last six and the last six in the Book of Changes mean?

Yang Yao is a long horizontal line, representing Yang. It is called "nine" in speech because the ancient people in China thought that odd numbers represented "Yang". Yin is two short horizontal lines, representing Yin. Say "six" in the speech, because even numbers represent "yin". The so-called "eight diagrams" means that each hexagram is made up of three hexagrams in different combinations. It symbolizes eight natural phenomena: heaven, earth, thunder, wind, water, fire, mountains and mountains. Each divination symbolizes many things. Each of the eight diagrams in the Eight Diagrams is combined in pairs to form the "sixty-four hexagrams" in the Book of Changes, and each hexagram has six hexagrams. Therefore, hexagrams (hexagrams) are from bottom to top, and all positive hexagrams are: the 9th, 2nd, 3rd, 4th, 5th and 9th. Yin is the sixth, second, third, fourth, sixth and sixth day. It is easy to understand that the first line of the hexagram is the beginning, if it is yang, it is the ninth day, if it is yin, it is the sixth day. The second way is two, if it is yang, it is 92, if it is yin, it is 62, and so on. The top one is called Shang, which means, that is, Yang Yi, which is Shang Jiu.