What is a "life chart"?

Twenty-four solar terms, as the main means of traditional agriculture in China, cooperate with other means to complete its task. Wang Zhen, a scholar in the Yuan Dynasty, said in the book "Agricultural Books": "Twenty-eight nights, Sunday changes, the twelfth day, the meeting of the sun and the moon, the twenty-four gas passes, and the change of the seventy-second period, such as the circle after, such as the turn of the wheel, the festival of agriculture and mulberry, take this as an account." To this end, he made a "seasonal picture", which summarized the stars, solar terms and phenology in one picture, and fixed the month according to the 24 solar terms in order to arrange monthly farming. He also pointed out that the map is based on "the spirit of heaven and earth in the north and south" and should be used flexibly according to the specific conditions of each place, instead of "sticking to the post". This is a summary of China agricultural time index system.