Those who know the Book of Changes come in. Excuse me, the ninth day, the second day, the third day and so on. What do you mean? What do you mean, go? I basically understand everything else. I will. H

Those who know the Book of Changes come in. Excuse me, the ninth day, the second day, the third day and so on. What do you mean? What do you mean, go? I basically understand everything else. I will. Help me. You know almost everything else, but I know nothing! But the teacher said so, the ninth day, ninety-two, ninety-three and so on. . .

I remember the teacher said that at first, ancient people stood in the sun with a wooden stick and then drew bars on the ground. When the sun shines on the stick, the shadow of the stick will be reflected on the painted stick. People record time through this simple device that is not a device. This is the prototype of the Chinese watch in front of Tiananmen Square.

We can understand it this way: that bar is a bar. The shadow of the stick shone on the bar, and it looked as if the stick had been cut in two. This is the female rod cut in two. In the Book of Changes, we call it six. Is it Yang who hasn't been cut in half? We call it nine.

There are six hexagrams in the Book of Changes. In order to show their position, we show them in a specific way.

Back to the stick standing in the sun, when the sun shines on the stick, the shadow of the stick is reflected on the first stick, and the first stick becomes a negative stick, which is six. We can use "the sixth day" to represent this first negative stick. If the shadow of the stick is not reflected on the first stick, then the first stick is a positive stick, that is, nine. We call this first rod "the ninth day". The second is called 62 or 92, the third is called 6393, and the fourth is also called 6465 or 9495.

Because the Book of Changes has six hexagrams, when we say the sixth hexagram, it doesn't follow the above rules, it has changed. We use "Shang" to indicate that the sixth is up to nine.

Maybe that's not the case. Let's understand it this way, for the sake of memory. We don't care why we call it that, because we are neither Fuxi nor King Wen. We just need to remember these things, just as our teacher told us to remember 1+ 1=2 when we were young, but we won't tell us, and we don't need to know why 1+ 1 equals 2. Until now, I have never used the principle that 1+ 1 equals 2.