with leap month. The observatory found at Taosi coincides with these records. It is theorized that the city collapsed with a rebellion against the ruling class. On the other hand, some Western scholars assert that emperor Yao was a mythical figure. Notes References Chang, Kwang-chih. The Archaeology of Ancient China, He, Nu and Wu, Jiabi. Astronomical date of the "observatory" at Taosi site Higham, Charles, The Bronze Age of Southeast Asia, Liu, Li. The Chinese Neolithic: Trajectories to Early States, Archaeological sites in China Former populated places in China Major National Historical and Cultural Sites in Shanxi 23rd-century BC establishments