s associated with the other months in <span class="nowrap">N<sub>y</sub></span> can be computed by adding integer multiples of <span class="nowrap">P<sub>L</sub></span>. However, we need to know the leap months before <span class="nowrap">N<sub>y</sub></span> in order to compute the accumulated months A(y). Leap months and calculation of A(y) are discussed in the following section.</p>
    
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<sect id="leap">Leap Months and Accumulated Months</sect>
    
<p>As stated in Introduction, all of the lea