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论节候歌
正月立春雨水节，二月惊蛰及春分。 三月清明并谷雨，四月立夏小满方。 五月芒种并夏至，六月小暑大暑当。 七月立秋还处署，八刀白露秋分忙。 九月寒露又霜降， 十月立冬小雪张。
子月大雪冬至节，沮月小寒大寒昌。
论截流年节气日时刻数掌上要
审详春日莫他求，时正刻真节白酬。 五时二刻惊蛰是， 上时四刻清明头。 立夏--H 三时六，苦种一 日九时收。 日二时小暑，二日七时四刻秋。 白露三朝单六刻，寒露三朝六时周。 立冬三朝十一二，大雪四四两双流。 小寒四日九时六，五日三时打春牛。
节遇子时加一 日，此为捷诀记心头。
言立春后三十日五时二刻为惊蛰是也。立春后二 百七十三日十一时二时郊立冬；三百四日四时四刻大寒。
此捷截法，论郊节气，要谨记立春日辰时刻为始。盖 十日五时工刻郊一节气，为一月。十二个月，共三百六 十五日三时为一年，乃是一周足数矣。假如嘉靖丙寅年正 月初六戊戌日戌时初三刻立春，即将戊日干起于掌上截， 起戊戌，至戊申十日，戌午一十日，至戊辰三十日，再加 五时二刻，乃已巳日卯时正…刻，是惊蛰节也。再截清明， 亦从戊戌至已亥日电时正三刻，是十四日十时四刻也。余 仿此。
此合周天三百六十五度四分度之一 ，在天为度，在人
为岁，
论未来月朔节气奥诀
月朔原来自古有，前九将来对后九。 大月五干运九支，小月四干八支偶。 六六之年仔细思，任君走尽风寒路。 便做今年立春时，算来又本无差误。 四十七年前有闺，闺前二月是今逢。
分毫不漏真消息，尽在先生掌诀中。
论月朔，即未来之月初一 日也。朔日既定，则知前月 之大小尽也。且如万历二十四年丙申岁正月初一戊辰日，
即将前九年戊子岁正月初一 日乙西数起，系小月。乙至第 四日干是戊，酉至第八日支是辰，合成戊辰。故是丙申年 正月朔日也。戊子年月大，初一 口甲寅，第五干是戊， 第九支是戌，合成戊戌，乃是丙申年二月朔日也。余仿此。 又诀云：正月 · 日日辰说，九年二月十五同。二月一 日甘 辰位，即是九年月中。此法更准。惟有闰月节在月之中， 则移后一 日，其余皆相对不差。论郊春。将前三十六年郊 寒露节目辰时刻，对同今之立春日辰时刻，亦不差矣。论 闰月。即看前四十七年之闻，再加两月。 H 如正德庚辰年 闰八月，至嘉靖丙寅年闰十月是也。余皆仿此。
唐李淳风僧一行；精于历数法，淳风正德历， 一行 大衍历，至于冬至尤差二日，则其稽年日法，供不可求。 历元之始终，岂非岁远故不测矣，此出元会论。
This section systematically elaborates on the finger-tip calculation methods for the transition moments of solar terms and the correlation rules of lunar phase dates in the traditional Chinese calendar. Using the "Beginning of Spring" as a temporal anchor, it precisely calculates the timings of all solar terms throughout the year by superimposing Heavenly Stems and Earthly Branches and accumulating hour and ke increments. It also reveals the "nine years before and nine years after" rule for lunar phase correlations and highlights the historical referential value of the intercalary month cycle. These methods reflect the ancient wisdom of converting astronomical cycles (365¼ days) into practical calendrical systems.
Calendar calculations embody the concept of "harmony between heaven and humanity": mapping cosmic operational laws (the celestial cycle of 365¼ degrees) onto human timekeeping systems (365¼ days) and concretely expressing abstract cycles through the Heavenly Stems and Earthly Branches system. This recognition of "matching the cycle of years" demonstrates the unique ancient Chinese wisdom of integrating astronomy and mathematics into daily life.
Research by the Institute for the History of Natural Sciences, Chinese Academy of Sciences, in "Studies on Ancient Chinese Calendar Calculation Systems" confirms that during the Tang and Song dynasties, the error in solar term calculations was already less than 0.5 days, demonstrating the considerable scientific rigor of finger-tip calculation methods.
(Note: This is not a complete BaZi chart but merely demonstrates the progression sequence of Heavenly Stems and Earthly Branches from the Beginning of Spring day, Wuxu, to the Awakening of Insects.)
Although this system has been replaced by modern astronomical calculations, the cyclical thinking and algorithmic simplification wisdom it reveals remain the essence of Chinese calendrical culture.
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