he leap months in the Chunqiu calendar were irregular and so A(y) must be computed year by year based on the leap month information. By contrast, leap months between <span class="nowrap">N<sub>-245</sub></span> and <span class="nowrap">N<sub>-104</sub></span> followed the regular 3-3-3-2-3-3-2 pattern, but the leap-year cycle was interrupted after <span class="nowrap">N<sub>-162</sub></span> and the counting was reset to a different year of origin after that. It is therefore not necessary to calculate A(y) 