How did the ancients predict disasters?

First, observation, that is, experience, is more reliable and practical, and it is the crystallization of the wisdom of the ancients. For example, there will be some signs before some disasters happen, such as turbidity of rivers and wells and abnormal animals before earthquakes. Some phenomena before rain, such as ants moving the snake aisle, swallows flying low and rain, and a layer of water vapor on the surface of the water tank are usually signs of rain. There are also farmers who judge the future weather by observing meteorological changes. For example, during the Three Kingdoms, Zhu predicted first frost, Zhuge Liang borrowed the east wind, Guan Yuyan invaded the Seventh Army, and Cao Cao froze the ice city. The so-called night view of the sky is this role. In ancient times, there were officials who specialized in observing astronomical phenomena at night.

Second, relying on science and technology is reliable, that is, the technical content is high and the operation is not easy. The most famous one is Zhang Heng's seismograph, which can judge where an earthquake happened in a short time.

The third is divination, which is the most unreliable. Of course it depends on who is divining. A truly famous fortune teller can really figure out what will happen in the future. A cheap man is cheating the whole world.