blem is that there are many ways to construct a calendar based on the <i>s&#236;f&#275;n</i> system that matches all the data in the excavated calendar table. In Section 3.9 of the book <i>Ancient Chinese Calendars and Almanacs</i><sup><a href="QinHanCalendars.html#ZCBH2008">ZCBH08</a></sup> and in the paper "An  Attempt  to Discuss  the  Calendrics  of  the  Qin  and  Early  Han  According  to Newly Excavated Calendars on Slips and Boards"<sup><a href="QinHanCalendars.html#Zhang2007">Zhang07</a></sup>, Zh&