How did China understand the climate in ancient times?

There were many concepts related to "Qi" in ancient China, such as solar terms, climate, gasification, momentum, temperament and luck. If we carefully analyze these concepts, we will find that gas has attributes, and there is no neutral gas without attributes in the universe.

Qi consists of and. As a philosophical concept, Yin and Yang are widely used in later generations, but the concept of Yin and Yang only originated from the changes of calendars and seasons at the earliest.

The ancients believed that climate change was due to the effect of yin and yang, with yang representing heat and yin representing cold. The interaction of yin and yang in the universe changes alternately, which is reflected in the changes of the four seasons.

When it is hot in summer, it belongs to pure yang; When it is cold in winter, it belongs to pure yin; Yang Qi and Yin Qi lived and died together. In spring, Yang Qi increases and Yin Qi decreases.

When the yang spirit reaches its peak, it is the summer solstice, which is reversed, and the yin gradually rises and the yang gradually falls; When Yin Qi reached its peak, it was the winter solstice, and then reversed again, with Yang Qi rising and Yin Qi falling, completing the cycle of alternating changes.