30 days. However, this rule did not necessarily apply to month 12 because the conjunction of month 12 was calculated from epoch A and the conjunction of month 1 was calculated from epoch B. So the number of days in month 12 must be determined by the number of days between the two conjunctions.</p>
    
<p>The computation of solar terms is the same as above. Let's begin with the winter solstice (Z11). It follows from equation (1) that the Julian day of Z11 in <span class="nowrap">N<sub>-201</sub></span> is g