Qu Yuan's poem answers how high the sky is.

Tian Wen and Tian Wen are magnificent and peculiar scientific poems in Chu Ci. In this long poem, he raised 172 questions in one breath, including astronomy, geography, natural history and human history. From the perspective of astronomy, Tian Wen raised many questions about ancient historical sites and figures, which is of great significance to the study of ancient history and myths. But the most valuable place of Nine Questions is science, especially astronomy.