What do you do in March and April, and where does the answer come from in July and August?

The Book of Time is called "A Brief History of Time" of China people. Yu Shicun combined the 24 solar terms with personality and civilization: "Heaven is confirmed by people, humanity is fed back by heaven, and astronomy is confirmed by people." Yu Shicun believes that solar terms not only guide agricultural production, but also guide our health preservation. At the same time, they also enlighten our personality: "People should follow the rhythm of heaven and earth, and the books of the time should be beautifully written and elegantly bound. Relying on his extremely rich knowledge reserve, Yu Shicun is widely quoted, with all kinds of cultural allusions and beautiful Chinese and foreign poetry works; While popularizing traditional cultural knowledge, there are also many questions and reflections on modern philosophy and modern life. Yu Shicun said it was the "most beautiful book" he had ever written.