《汉书·纪·成帝纪》
所以《尚书》说： 众民能适应变化，保持雍和。 说明阴阳时令是十分重要的。
故《书》云 黎民于蕃时雍 ，明以阴阳为本也。
Therefore, the Book of History says: The common people can adapt to changes and maintain harmony. This shows that the solar terms are very important.