ction. We use <span class="nowrap">J<sub>10</sub></span> to do the calculation below:<br />
L = (JD<sub>Z11</sub> - J<sub>10</sub>)/(29 + 499/940) = 1 + 189201/222072, <br />
lunation fraction of Z11 = 189201/222072 &approx; 16.2/19.</p>
    
<p>Z10 was two solar terms before Z11, so<br />
JD<sub>Z10</sub> = JD<sub>Z11</sub> - (2/24)&times;365.25 = 1647604.5 + 29/32.<br />
The <i>xi&#462;oy&#250;</i> was 29/32. The Julian day at noon on the day of Z10 was 1647605. The corresponding date in the proleptic Jul