《汉书·纪·高帝纪下》
于是各位侯王及太尉长安侯卢绾等三百人，与博士稷嗣君叔孙通谨择吉日二月初三日，上皇帝尊号，汉王即皇帝位于汜水以北的济阴。
于是诸侯王及太尉长安侯臣绾等三百人，与博士稷嗣君叔孙通谨择良日二月甲午，上尊号。汉王即皇帝位于汜水之阳。
So the marquises and kings, as well as the Grand Tutor, Marquis of Chang'an, Lu Wan, and 300 others, carefully selected an auspicious day, the third day of the second month, to give the title of emperor, and King Han ascended to the throne of the emperor in Jiyin, north of Sishui.