57;n (&#37504;&#38592;&#23665;) in Sh&#257;nd&#333;ng province in eastern China. The bamboo slips contain a calendar table for the year <span class="nowrap">N<sub>-133</sub></span>, providing very valuable information on how months and days were arranged in that year. The calendar table lists the sexagenary names of the first days in each month. The year <span class="nowrap">N<sub>-133</sub></span> had 13 months, with a leap month placed at the end of the year. Of the 13 sexagenary dates for the 13 months, 