12 and the dates of Z1 were all in month 1. The leap years after <span class="nowrap">N<sub>-162</sub></span> coincided with the years in which the lunation fractions of Z1 were greater than <span class="nowrap">12/19</span>.</p>
    
<p>Even though the table on <a href="QinHanSolarTerms.html">this page</a> only lists a few solar terms. I have computed all 24 solar terms. I find that before <span class="nowrap">N<sub>-162</sub></span>, only the dates of Z11 were fixed to a month and the leap years only coin