Introduction to the Shangtian Terrace: There are three theories about the Shangtian Terrace: one is that Qin Shihuang built it to watch astronomical scenes; the other is that Qin Shihuang built it for Xu Fu. Qin Shihuang sent Xu Fu eastward to search for the elixir of immortality for him, but he did not return for several months. Qin Shihuang was very worried, so he built this high platform to look eastward, also known as "Wangfu Platform"; thirdly, the ancient ancestors believed that the harvest would be abundant and the peace and prosperity would be They are all blessed by the gods of heaven and earth, so Qin Shihuang regularly led his courtiers to offer sacrifices to heaven and earth to pray for the prosperity of the Qin Empire and peace in the world.