The universe is chaotic, why can Zhouyi be calculated?

It is conceivable that one night thousands of years ago, one man said to another, "Thunder is Lei Zhenzi's duty, and rain is the duty of the East China Sea Dragon King. Why do we mortals guess God's will? This is going to make people angry! " . Then today's weather forecast predicts the rain and snow in the next few days over and over again. Whether the future can be predicted for the time being is not mentioned, but it is a frog in the well to assert that nothing will happen tomorrow with today's knowledge.

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Speaking of weather forecast, I'm curious that weather forecast predicts the future every day. Why not say "the universe is chaotic, why can the weather forecast be calculated?" How about this idea?

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The answer is that you won't feel strange because the operational logic of weather forecast is within your understanding, but the operational logic of Zhouyi is beyond your understanding, so you feel strange.

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The universe is chaotic. This conclusion is only based on the current knowledge system. An ant will think that human beings are boundless, and a primitive person will think that algebraic problems will never be solved. Perhaps it is only because human intelligence and technology are not enough to understand the operating logic of the universe that human beings will tell the theory of chaos in the universe now. Maybe one day in the future, humans can unlock the code of the universe, or they may not. Anything is possible. You should admit this possibility, not assert "impossible".