（《素问·六微旨大论》）
帝曰∶愿闻其步何如？（此连前章，而详求其六步之数。六步，即六气之位数也。）岐伯曰∶所谓步者，六十度而有
奇。（一日一度，度即日也。周岁共三百六十五日二十五刻，以六步分之，则每步得六十日又八十七刻半，故曰有奇也。）
故二十四步，积盈百刻而成日也。（二十四步，合四岁之步也。积者，积二十四个八十七刻半，共得二千一百刻，是为二
十一日。以四岁全数合之，正得一千四百六十一日。此共以二十四步之余，积盈百刻，合成四岁之全日，而三合会同之
气数，于斯见矣。详如下文。）帝曰∶六气应五行之变何如？岐伯曰∶位有终始，气有国中，上下不同，求之亦异也。（此
复求上文天道六六之节，地理之应六节气位，及《天元纪大论》所谓上下相召、五六相合之至数也。位，地位也。气，
天气也。位有上下左右之终始，气有前后升降之国中，以天之气而加于地之位，则上下相错，互有差移，故曰上下不同，
求之亦异也。国中详义见后章。）帝曰∶求之奈何？岐伯曰∶天气始于甲，地气始于子，子甲相合，命曰岁立，谨候其时，
气可与期。（天气有十干而始于甲，地气有十二支而始于子，子甲相合，即甲子也。干支合而六十年之岁气立，岁气立则
有时可候，有气可期矣。）帝曰∶愿闻其岁六气始终早晏何如？岐伯曰∶明乎哉问也！甲子之岁，初之气，天数始于水下
一刻，终于八十七刻半；（甲子岁，六十年之首也。初之气，六气之首，地之左间也。始于水下一刻，漏水百刻之首，寅
初刻也。终于八十七刻半，谓每步之数，各得六十日又八十七刻半也。故甲子岁初之气，始于首日寅时初初刻，终于六
十日后子时初四刻，至子之正初刻，则属春分节而交于二之气矣。凡后之申子辰年皆同。水下义，又见经络类二十五。
有甲子等岁六气终始日刻图解，在《图翼》二卷。）二之气，始于八十七刻六分，终于七十五刻；（此继初气而始于八十
七刻六分，直子之正初刻也。又加二气之六十日余八十七刻半，则此当终于七十五刻，直戌之正四刻也。后义仿此。）三
之气，始于七十六刻，终于六十二刻半；（始于七十六刻，亥初初刻也。终于六十二刻半，酉初四刻也。）四之气，始于
六十二刻六分，终于五十刻；（始于六十二刻六分，酉正初刻也。终于五十刻，未正四刻也。）五之气，始于五十一刻，
终于三十七刻半；（始于五十一刻，申初初刻也。终于三十七刻半，午初四刻也。）六之气，始于三十七刻六分，终于二
十五刻。（始于三十七刻六分，午正初刻也。终于二十五刻，辰正四刻也。此二十五刻者，即岁余法四分日之一也。）所
谓初六，天之数也。（初六者，子年为首之六气也。此以天之气数，而加于地之步位，故曰天之数也。后仿此。）
乙丑岁，初之气，天数始于二十六刻，终于一十二刻半；（始于二十六刻，巳初初刻也。终于一十二刻半，卯初四刻
也。凡后之巳酉丑年皆同。）二之气，始于一十二刻六分，终于水下百刻；（始于一十二刻六分，卯正初刻也。终于水下
百刻，丑正四刻也。）三之气，始于一刻，终于八十七刻半；（始于一刻，寅初初刻也。终于八十七刻半，子初四刻也。）
四之气，始于八十七刻六分，终于七十五刻；（始于八十七刻六分，子正初刻也。终于七十五刻，戌正四刻也。）五之气，
始于七十六刻，终于六十二刻半；（始于七十六刻，亥初初刻也。终于六十二刻半，酉初四刻也。）六之气，始于六十二
刻六分，终于五十刻。（始于酉正初刻，终于未正四刻。此五十刻者，四分日之二也。）所谓六二，天之数也。（丑次于子，
故曰六二。天之数，义见前。）
丙寅岁，初之气，天数始于五十一刻，终于三十七刻半；（始于申初初刻，终于午初四刻。凡后寅午戌年皆同。）二
之气，始于三十七刻六分，终于二十五刻；（始于午正初刻，终于辰正四刻。）三之气，始于二十六刻，终于一十二刻半；
（始于巳初初刻，终于卯初四刻。）四之气，始于一十二刻六分，终于水下百刻。（始于卯正初刻，终于丑正四刻。）五之
气，始于一刻，终于八十七刻半；（始于寅初初刻，终于子初四刻。）六之气，始于八十七刻六分，终于七十五刻。（始于
子正初刻，终于戌正四刻。此七十五刻者，四分日之三也。）所谓六三，天之数也。（寅次于丑，故曰六三。）
丁卯岁，初之气，天数始于七十六刻，终于六十二刻半；（始于亥初初刻，终于酉初四刻，凡后之亥卯未年皆同。）
二之气，始于六十二刻六分，终于五十刻；（始于酉正初刻，终于未正四刻。）三之气，始于五十一刻，终于三十七刻半；
（始于申初初刻，终于午初四刻。）四之气，始于三十七刻六分，终于二十五刻；（始于午正初刻，终于辰正四刻。）五之
气，始于二十六刻，终于一十二刻半；（始于巳初初刻，终于卯初四刻。）六之气，始于一十二刻六分，终于水下百刻。（始
于卯正初刻，终于丑正四刻。此水下百刻者，即上文所谓二十四步、积盈百刻而成日也。）所谓六四，天之数也。（卯次
于寅，故曰六四。此一纪之全数也。）
次戊辰岁，初之气，复始于一刻，常如是无已，周而复始。（以上丁卯年六之气，终于水下百刻，是子丑寅卯四年气
数至此已尽，所谓一纪。故戊辰年，则气复始于一刻，而辰巳午未四年又为一纪。辰巳午未之后，则申酉戌亥四年又为
一纪。此所以常如是无已，周而复始也。）
帝曰∶愿闻其岁候何如？岐伯曰∶悉乎哉问也！日行一周，天气始于一刻；（岁候者，通岁之大候。此承上文而复总
其气数之始也。一周者，一周于天，谓甲子一年为岁之首也。）日行再周，天气始于二十六刻；（乙丑岁也。）日行三周，
天气始于五十一刻；（丙寅岁也。）日行四周，天气始于七十六刻；（丁卯岁也。）日行五周，天气复始于一刻，（戊辰岁也。）
所谓一纪也。（如前四年是也，一纪尽而复始于一刻矣。纪者，如天元纪大论所谓终地纪者，即此纪字之义。）是故寅午
戌岁气会同，卯未亥岁气会同，辰申子岁气会同，巳酉丑岁气会同，终而复始。（六十年气数周流，皆如前之四年，故四
年之后，气复如初。所以寅午戌为会同，卯未亥为会同，辰申子为会同，巳酉丑为会同。今阴阳家但知此为三合类局，
而不知由于气数之会同如此。有六十年岁气三合会同图，在《图翼》二卷。）
（《素问·六微旨大论》）
黄帝说：我想了解“步”的具体情况。（这是承接上一章，详细探究六步的数值。所谓六步，就是六气所占据的时间位数。）岐伯说：所谓的“步”，是六十天多一点。（一天为一度，度即指日。一周年共有三百六十五又四分之一日，将其分为六步，则每一步得到六十天又八十七刻半，所以说“有奇”。）因此，二十四步累积起来，盈出的余数正好合成一日。（二十四步，合四年之步数。累积是指将二十四个八十七刻半相加，共得二千一百刻，这相当于二十一日。加上四年的总天数一千四百六十一日，正好吻合。这里是通过二十四步的余数，累积满百刻而合成四岁的完整日数，从而体现了三合会同的气数规律，详见下文。）黄帝说：六气对应五行的变化是怎样的？岐伯说：位置有终始，气运有国中分布，上下不同，推求方法也有差异。（这是再次探究上文天道六六之节律，地理对六节气位的响应，以及《天元纪大论》所说的上下相召、五六相合的最高法则。位，指地之位。气，指天之气。地位有上下左右的终始，气运有前后升降的国中分布，以天之加临于地之位，则上下交错，互有差移，所以说上下不同，推求结果也有异。“国中”的详细含义见后章。）黄帝说：如何推求呢？岐伯说：天气始于甲，地气始于子，子与甲相合，称为岁立，谨慎观察其时，气运就可以预测了。（天气有十个天干而始于甲，地气有十二个地支而始于子，子甲相合，即是甲子。干支相合而确立六十年的一轮岁气，岁气确立则有时可候，有气可期。）黄帝说：我想了解每年六气的始终早晚情况是怎样的？岐伯说：问得好！甲子年，初之气，天数始于水下一刻，终于八十七刻半；（甲子年是六十年之首。初之气是六气之首，也是地之左间。始于水下一刻，即漏水百刻之首，寅时初刻。终于八十七刻半，意指每步之数各得六十日又八十七刻半。所以甲子年初之气，始于首日寅时初初刻，终于六十日后子时初四刻，到子正初刻，则属于春分节气并交接于二之气。此后申子辰年皆相同。“水下”的含义，又见于经络类二十五卷。有甲子等岁六气终始日刻图解，在《图翼》二卷。）二之气，始于八十七刻六分，终于七十五刻；（这继初之气之后，始于八十七刻六分，直抵子正初刻。再加二气的六十日余八十七刻半，则此步当终于七十五刻，直抵戌正四刻。后续意义仿照此类推。）三之气，始于七十六刻，终于六十二刻半；（始于七十六刻，亥初初刻。终于六十二刻半，酉初四刻。）四之气，始于六十二刻六分，终于五十刻；（始于六十二刻六分，酉正初刻。终于五十刻，未正四刻。）五之气，始于五十一刻，终于三十七刻半；（始于五十一刻，申初初刻。终于三十七刻半，午初四刻。）六之气，始于三十七刻六分，终于二十五刻。（始于三十七刻六分，午正初刻。终于二十五刻，辰正四刻。这二十五刻，即岁余法中四分日之一。）这叫作“初六”，是天之数。（初六，指子年为首的前六气。这是以天之气数加于地之步位，所以叫作天之数。后续仿照此理。）
乙丑年，初之气，天数始于二十六刻，终于一十二刻半；（始于二十六刻，巳初初刻。终于一十二刻半，卯初四刻。此后巳酉丑年皆相同。）二之气，始于一十二刻六分，终于水下百刻；（始于一十二刻六分，卯正初刻。终于水下百刻，丑正四刻。）三之气，始于一刻，终于八十七刻半；（始于一刻，寅初初刻。终于八十七刻半，子初四刻。）四之气，始于八十七刻六分，终于七十五刻；（始于八十七刻六分，子正初刻。终于七十五刻，戌正四刻。）五之气，始于七十六刻，终于六十二刻半；（始于七十六刻，亥初初刻。终于六十二刻半，酉初四刻。）六之气，始于六十二刻六分，终于五十刻。（始于酉正初刻，终于未正四刻。这五十刻，是四分日之二。）这叫作“六二”，是天之数。（丑次于子，所以叫六二。天之数的含义见前文。）
丙寅年，初之气，天数始于五十一刻，终于三十七刻半；（始于申初初刻，终于午初四刻。此后寅午戌年皆相同。）二之气，始于三十七刻六分，终于二十五刻；（始于午正初刻，终于辰正四刻。）三之气，始于二十六刻，终于一十二刻半；（始于巳初初刻，终于卯初四刻。）四之气，始于一十二刻六分，终于水下百刻。（始于卯正初刻，终于丑正四刻。）五之气，始于一刻，终于八十七刻半；（始于寅初初刻，终于子初四刻。）六之气，始于八十七刻六分，终于七十五刻。（始于子正初刻，终于戌正四刻。这七十五刻，是四分日之三。）这叫作“六三”，是天之数。（寅次于丑，所以叫六三。）
丁卯年，初之气，天数始于七十六刻，终于六十二刻半；（始于亥初初刻，终于酉初四刻，此后亥卯未年皆相同。）二之气，始于六十二刻六分，终于五十刻；（始于酉正初刻，终于未正四刻。）三之气，始于五十一刻，终于三十七刻半；（始于申初初刻，终于午初四刻。）四之气，始于三十七刻六分，终于二十五刻；（始于午正初刻，终于辰正四刻。）五之气，始于二十六刻，终于一十二刻半；（始于巳初初刻，终于卯初四刻。）六之气，始于一十二刻六分，终于水下百刻。（始于卯正初刻，终于丑正四刻。这水下百刻，即上文所说的二十四步、积盈百刻而成日。）这叫作“六四”，是天之数。（卯次于寅，所以叫六四。这是一纪的全数。）
接着是戊辰年，初之气，又复始于一刻，常常如此没有止境，周而复始。（以上丁卯年六之气，终于水下百刻，说明子丑寅卯四年气数至此已尽，称为一纪。所以戊辰年，气复始于一刻，而辰巳午未四年又为一纪。辰巳午未之后，则申酉戌亥四年又为一纪。这就是为什么常如是无已，周而复始的原因。）
黄帝说：我想了解每年的气候征候是怎样的？岐伯说：问得详尽啊！太阳运行一周，天气始于一刻；（岁候，指通年的大气候。这是承接上文而总括气数的起始。一周，指绕天一周，即甲子一年为岁之首。）太阳运行两周，天气始于二十六刻；（乙丑年。）太阳运行三周，天气始于五十一刻；（丙寅年。）太阳运行四周，天气始于七十六刻；（丁卯年。）太阳运行五周，天气复始于一刻，（戊辰年。）这叫作一纪。（如前四年所示，一纪结束后又复始于一刻。纪，如同《天元纪大论》所说的“终地纪”，就是这个纪字的含义。）因此，寅午戌年岁气会同，卯未亥年岁气会同，辰申子年岁气会同，巳酉丑年岁气会同，终而复始。（六十年气数周流，都如前所述的四年循环，所以四年之后，气复如初。因此寅午戌为会同，卯未亥为会同，辰申子为会同，巳酉丑为会同。现在的阴阳家只知道这是三合类局，而不知道是由于气数会同如此。有六十年岁气三合会同图，在《图翼》二卷。）
(Su Wen, Chapter 64: "Da Lun on the Great Principles of the Six Micro-Aspects")
The Yellow Emperor said: I wish to hear about the specifics of the "steps" (Bu). [This connects with the previous chapter, seeking in detail the numerical values of the six steps. The six steps refer to the positional numbers of the Six Qi.] Qibo replied: What is meant by a "step" is sixty days plus a fraction. [One day equals one degree; degree here refers to a day. A full year consists of 365 and 1/4 days. Divided into six steps, each step amounts to 60 days and 87.5 ke (quarter-hours), hence it is said to have a remainder.] Therefore, twenty-four steps accumulate a surplus that exactly forms one day. [Twenty-four steps correspond to four years' worth of steps. Accumulation refers to summing twenty-four instances of 87.5 ke, totaling 2,100 ke, which equals 21 days. Combined with the total days of four years (1,461 days), this matches perfectly. Here, through the surplus of twenty-four steps, accumulating to a hundred ke forms the complete days of four years, revealing the numerical principles of the Triple Convergence (San He Hui Tong), as detailed below.] The Yellow Emperor said: How do the Six Qi correspond to the transformations of the Five Elements? Qibo replied: Positions have beginnings and endings; Qi has distribution within the realms; Heaven and Earth differ, so the methods of inquiry also vary. [This revisits the discussion on the Heavenly Dao's six-six rhythms, the geographical response to the six Qi positional nodes, and the supreme principles mentioned in Tian Yuan Ji Da Lun regarding the mutual invocation of Heaven and Earth and the combination of five and six. Position refers to Earth's position; Qi refers to Heaven's Qi. Earth's positions have beginnings and endings in up-down-left-right directions; Qi has ascending-descending movements within its realms. When Heavenly Qi overlays Earthly positions, they interlace and shift relative to each other, thus it is said that Heaven and Earth differ, and the results of inquiry vary. The detailed meaning of "realm" (Guo Zhong) is found in the following chapter.] The Yellow Emperor said: How should we inquire? Qibo replied: Heavenly Qi begins with Jia (the first Heavenly Stem); Earthly Qi begins with Zi (the first Earthly Branch). When Zi and Jia combine, it is called "Sui Li" (Establishment of the Year). Carefully observe the timing, and the Qi can be anticipated. [Heavenly Qi comprises ten Heavenly Stems starting with Jia; Earthly Qi comprises twelve Earthly Branches starting with Zi. The combination of Zi and Jia constitutes Jia Zi. The convergence of Stems and Branches establishes the sixty-year cycle of annual Qi. Once established, there are times to observe and Qi to anticipate.] The Yellow Emperor said: I wish to know the beginning and end, early and late timings of the Six Qi for each year. Qibo replied: Excellent question! In the year of Jia Zi, the First Qi begins at Ke 1 (underwater mark 1) and ends at Ke 87.5; [Jia Zi is the first year of the sixty-year cycle. The First Qi is the head of the Six Qi and the Left Interstitial of Earth. It begins at Ke 1, the start of the hundred-ke water clock, at the beginning of Yin hour. It ends at Ke 87.5, meaning each step comprises 60 days and 87.5 ke. Thus, the First Qi of Jia Zi begins at the very first ke of Yin hour on the first day and ends at the fourth ke of Zi hour after sixty days. At the exact start of Zi hour, it enters the Spring Equinox solar term and transitions to the Second Qi. This applies similarly to Shen, Zi, and Chen years. The meaning of "underwater" is further explained in Class 25 of Meridians. Diagrams of the beginning and ending dates and ke for the Six Qi of Jia Zi and other years are in Volume 2 of Tu Yi.] The Second Qi begins at Ke 87.6 and ends at Ke 75; [Following the First Qi, it starts at Ke 87.6, reaching the exact start of Zi hour. Adding the remaining 87.5 ke from the sixty days of the Second Qi, it ends at Ke 75, reaching the fourth ke of Xu hour. Subsequent logic follows this pattern.] The Third Qi begins at Ke 76 and ends at Ke 62.5; [Starts at Ke 76, beginning of Hai hour. Ends at Ke 62.5, fourth ke of You hour.] The Fourth Qi begins at Ke 62.6 and ends at Ke 50; [Starts at Ke 62.6, exact start of You hour. Ends at Ke 50, fourth ke of Wei hour.] The Fifth Qi begins at Ke 51 and ends at Ke 37.5; [Starts at Ke 51, beginning of Shen hour. Ends at Ke 37.5, fourth ke of Wu hour.] The Sixth Qi begins at Ke 37.6 and ends at Ke 25. [Starts at Ke 37.6, exact start of Wu hour. Ends at Ke 25, fourth ke of Chen hour. These 25 ke represent one-quarter of a day in the annual remainder calculation.] This is called "Chu Liu" (Initial Six), representing the Heavenly Number. [Chu Liu refers to the first six Qi starting with the Zi year. Since Heavenly Qi numbers are applied to Earthly positional steps, it is called the Heavenly Number. Subsequent cases follow this principle.]
In the year of Yi Chou, the First Qi begins at Ke 26 and ends at Ke 12.5; [Starts at Ke 26, beginning of Si hour. Ends at Ke 12.5, fourth ke of Mao hour. This applies similarly to Si, You, and Chou years.] The Second Qi begins at Ke 12.6 and ends at Ke 100 (underwater hundred marks); [Starts at Ke 12.6, exact start of Mao hour. Ends at Ke 100, fourth ke of Chou hour.] The Third Qi begins at Ke 1 and ends at Ke 87.5; [Starts at Ke 1, beginning of Yin hour. Ends at Ke 87.5, fourth ke of Zi hour.] The Fourth Qi begins at Ke 87.6 and ends at Ke 75; [Starts at Ke 87.6, exact start of Zi hour. Ends at Ke 75, fourth ke of Xu hour.] The Fifth Qi begins at Ke 76 and ends at Ke 62.5; [Starts at Ke 76, beginning of Hai hour. Ends at Ke 62.5, fourth ke of You hour.] The Sixth Qi begins at Ke 62.6 and ends at Ke 50. [Starts at exact You hour, ends at fourth ke of Wei hour. These 50 ke represent half a day (two-quarters).] This is called "Liu Er" (Six Two), representing the Heavenly Number. [Chou follows Zi, hence called Liu Er. The meaning of Heavenly Number is seen above.]
In the year of Bing Yin, the First Qi begins at Ke 51 and ends at Ke 37.5; [Starts at beginning of Shen hour, ends at fourth ke of Wu hour. This applies similarly to Yin, Wu, and Xu years.] The Second Qi begins at Ke 37.6 and ends at Ke 25; [Starts at exact Wu hour, ends at fourth ke of Chen hour.] The Third Qi begins at Ke 26 and ends at Ke 12.5; [Starts at beginning of Si hour, ends at fourth ke of Mao hour.] The Fourth Qi begins at Ke 12.6 and ends at Ke 100. [Starts at exact Mao hour, ends at fourth ke of Chou hour.] The Fifth Qi begins at Ke 1 and ends at Ke 87.5; [Starts at beginning of Yin hour, ends at fourth ke of Zi hour.] The Sixth Qi begins at Ke 87.6 and ends at Ke 75. [Starts at exact Zi hour, ends at fourth ke of Xu hour. These 75 ke represent three-quarters of a day.] This is called "Liu San" (Six Three), representing the Heavenly Number. [Yin follows Chou, hence called Liu San.]
In the year of Ding Mao, the First Qi begins at Ke 76 and ends at Ke 62.5; [Starts at beginning of Hai hour, ends at fourth ke of You hour. This applies similarly to Hai, Mao, and Wei years.] The Second Qi begins at Ke 62.6 and ends at Ke 50; [Starts at exact You hour, ends at fourth ke of Wei hour.] The Third Qi begins at Ke 51 and ends at Ke 37.5; [Starts at beginning of Shen hour, ends at fourth ke of Wu hour.] The Fourth Qi begins at Ke 37.6 and ends at Ke 25; [Starts at exact Wu hour, ends at fourth ke of Chen hour.] The Fifth Qi begins at Ke 26 and ends at Ke 12.5; [Starts at beginning of Si hour, ends at fourth ke of Mao hour.] The Sixth Qi begins at Ke 12.6 and ends at Ke 100. [Starts at exact Mao hour, ends at fourth ke of Chou hour. This underwater hundred ke corresponds to the aforementioned accumulation of twenty-four steps forming a day.] This is called "Liu Si" (Six Four), representing the Heavenly Number. [Mao follows Yin, hence called Liu Si. This constitutes the full number of one Ji (Cycle).]
Next is the year of Wu Chen. The First Qi restarts at Ke 1, continuing endlessly in this manner, cycling back to the beginning. [The Sixth Qi of the preceding Ding Mao year ended at Ke 100, indicating that the Qi numbers for the Zi, Chou, Yin, and Mao years are now exhausted, constituting one Ji. Thus, in Wu Chen year, Qi restarts at Ke 1, and the Chen, Si, Wu, and Wei years form another Ji. After Chen, Si, Wu, and Wei, the Shen, You, Xu, and Hai years form yet another Ji. This is why it continues endlessly, cycling back to the start.]
The Yellow Emperor said: I wish to know what the annual climatic indications are like. Qibo replied: Your question is thorough! When the Sun completes one circuit, Heavenly Qi begins at Ke 1; [Annual climatic indication refers to the general climate of the whole year. This summarizes the starting points of Qi numbers following the previous text. One circuit refers to one revolution around the heavens, i.e., the Jia Zi year as the head of the year.] When the Sun completes two circuits, Heavenly Qi begins at Ke 26; [Yi Chou year.] When the Sun completes three circuits, Heavenly Qi begins at Ke 51; [Bing Yin year.] When the Sun completes four circuits, Heavenly Qi begins at Ke 76; [Ding Mao year.] When the Sun completes five circuits, Heavenly Qi restarts at Ke 1, [Wu Chen year.] which is called one Ji. [As described in the previous four years, once a Ji ends, it restarts at Ke 1. Ji refers to the concept of "ending the Earthly Ji" mentioned in Tian Yuan Ji Da Lun.] Therefore, the annual Qi converges in the Yin-Wu-Xu years, in the Mao-Wei-Hai years, in the Chen-Shen-Zi years, and in the Si-You-Chou years, cycling endlessly. [The sixty-year Qi cycle flows as described in the previous four-year cycles, so after four years, the Qi returns to the beginning. Hence, Yin-Wu-Xu converge, Mao-Wei-Hai converge, Chen-Shen-Zi converge, and Si-You-Chou converge. Modern Yin-Yang practitioners only recognize these as San He (Triple Harmony) structural groups, unaware that this arises from the convergence of Qi numbers. A diagram of the Thirty-Year San He Convergence of Annual Qi is available in Volume 2 of Tu Yi.]