Introduction of solar terms retreating to the west

In 330 BC, the discovery of Yu in the Jin Dynasty, also known as precession, was a little later than in the West. Astronomically speaking, a more accurate determination is a week after 25800. This phenomenon means that the astronomical background is receding westward year by year, and China is the only country in the world that continuously observes astronomical phenomena. Moreover, the law of weather forecast is accumulated with the sky as the background. For example, Confucius knows that "the moon will rise in a torrential rain", which means that the sky indicates rain. However, due to the retreat of solar terms to the west, the experience of hundreds of years is wrong. This is the biggest problem that has puzzled China's ancestors for the longest time.