>On the Calendric System of the Qin and Early Han Dynasties</i><sup><a href="QinHanCalendars.html#Li2016">Li16</a></sup>). The gist of the reconstruction method is to divide the time interval between 245 BCE and 104 BCE into three periods. Lunar conjunctions in each period are calculated based on the <a href="guliuli.html#sifenSystem"><i>s&#236;f&#275;n</i> system</a>. The only difference between the three periods is the epoch of the <i>s&#236;f&#275;n</i> system, which can be regarded as a free parameter i