When Liu Bang entered the Hangu Pass, the five planets gathered in the East Well mansion. The astrologer Gan Gong advised Zhang Er to follow Liu Bang, interpreting the omen as a sign of imperial destiny. The East Well corresponded to the Qin heartland; Liu Bang took Xianyang and later became emperor.
Account
When Liu Bang entered the Hangu Pass, the five planets gathered in the East Well mansion. The astrologer Gan Gong advised Zhang Er to follow Liu Bang, interpreting the omen as a sign of imperial destiny. The East Well corresponded to the Qin heartland; Liu Bang took Xianyang and later became emperor.
Sources
- Records of the Grand Historian, "Biographies of Zhang Er and Chen Yu"
- Book of Han, "Treatise on Astronomy"