大家知道，中国古人使用天干地支纪年法，比如今年2018年是戊戌年，去年是丁酉年，而明年是己亥年。推算也很简单，就是十个天干：甲乙丙丁午己庚辛壬癸和十二地支：子丑寅卯，辰巳午未，申酉戌亥，两两组合成一对，就是这一年的年号。...比如要计算“甲子”+“戊戌”，我只要找到历史上任何一个甲子年和戊戌年的公历年份相加就可以了。比如我查到公元124年，汉安帝延光三年是一个甲子年，而1058年北宋嘉佑三年是戊戌年，所以我就计算124+1058=1182。我又查了下1182年，是南宋淳熙九年，是壬寅年，所以“甲子“+”戊戌”=“壬寅”。类似，比如还有“甲子”+“乙丑”=“己巳”，“丁丑”+“辛卯”=”戊申”等等。而且你会发现这个运算法则的神奇之处在于它并不依赖具体取哪一个公历年去对应这个干支年，不管你怎么选，计算结果是一样的。我前面特地选数字比较小的，因为比较好算。当然你也可以一次性列出这个60个称谓两两互相相加的3600中组合结果作为这种加法的定义。....五行相生相克图：订阅微信获取讲稿：dalaoli_shuxue
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