iscoveries in the 1980s and early 2000s. More calendrical bamboo slips were excavated from two tombs, covering years from <span class="nowrap">N<sub>-201</sub></span> to <span class="nowrap">N<sub>-185</sub></span>, and several years between <span class="nowrap">N<sub>-244</sub></span> and <span class="nowrap">N<sub>-208</sub></span>. These new data indicate that the calendar between 245 BCE and 104 BCE was more complicated than previously thought. They suggest that the calendar in the Qin dynasty (before 2