.</p>
    
<p>Next, we turn our attention to Z10. We can calculate it using equation (2), but Z10 in <span class="nowrap">N<sub>-130</sub></span> should be in the year <span class="nowrap">-131</span>. So y=<span class="nowrap">-131</span> should be used in the calculation. In fact, we don't need to use equation (2) at all. Z10 was two solar terms before Z11, so we can simply subtract <span class="nowrap">(2/24)P<sub>s</sub></span> from Z11:<br />
JD<sub>Z10</sub> = JD<sub>Z10</sub> - (2/24)&times;365.25 = 