《论衡·卷二十六·实知篇》
秦始皇三十七年十月癸丑的那一天出游，到达云梦泽，在九嶷山对虞舜举行 望 祭。
始皇三十七年十月癸丑出游，至云梦，望祀虞舜於九嶷。
On the day of Gui Chou in October of the 37th year of Qin Shi Huang, he went on a tour and reached Yunmeng Marsh, where he performed a "wang" sacrifice to Yu Shun at Jiuyi Mountain.