p months between <span class="nowrap">N<sub>-245</sub></span> and <span class="nowrap">N<sub>-104</sub></span> can be deduced from the excavated calendrical bamboo slips and available historical documents. We can therefore use these known leap months to calculate A(y) without relying on any particular intercalation rule. This is the approach adopted here.</p>
    
<p>The accumulated months A(y) can be calculated in the same way as described in the <a href="chunqiu.html#leapMons">Chunqiu calendar page</a>. T