\r经天五运起例之图\ps127a18.bmp\r
五天气立运
五行之气散流于天之五方，纪于五天，因此而命名立运。
歌曰∶
金素亢氐昴毕前，水玄张冀娄胃悬。
木苍危室柳鬼宿，火丹牛女奎壁边。
土 心尾角轸度，下临（此是运位）上经天。
十干起运化气歌
甲己土运乙庚金，丁壬之岁木当临。
丙辛化气常居水，戊癸须将火运寻。
十干所化五行，由五天气各临其位而生化。或谓十二生肖中，惟龙善变，属辰，每位自建寅
干支数至三，遇辰随所属化之。（如甲寅至丙辰化水，丙寅至戊辰化火。）或谓甲刚木克己柔土，
为夫妇，成土；乙柔木嫁庚刚金，成金；丁阴火配壬阳水，成木；丙阳火娶卒柔金，成水；戊阳
土娶癸阴水，成火。二说意近似，而理非自然。
夫十二支为十二月，则正月寅二月卯是也。甲己之岁，正月建丙寅；乙庚之岁，正月建戊寅；
丙辛之岁，正月建庚寅；丁壬之岁，正月建壬寅；戊癸之岁，正月建甲寅。乃用十干建于寅上，
观其法，甲子年为首，亦因六十甲子内初建者先建之，次建者次建之。故丙寅为初，戊寅为次，
根据先后循而转之可见也。前六十甲子纳音图中。（立位既终，复转于其上，以络其纪者明矣。建
时贴用日干同法。若五运阴年不及之岁，大寒日交初气，其日时建干与年干合者谓之干德符，当
为平气，非过与不及也。略举此以明其用而已，图其后。）
【经天五运起例之图】
五天气立运
五行之气散流于天之五方，记录于五天（指天空中的五个方位或星宿区域），因此以此命名并确立运（五运）的规律。
歌诀说：
金对应素色，位于亢、氐、昴、毕等星宿之前；
水对应玄色，位于张、冀、娄、胃等星宿之间；
木对应苍色，位于危、室、柳、鬼等星宿之中；
火对应丹色，位于牛、女、奎、壁等星宿之旁；
土对应黄色，位于心、尾、角、轸等星宿度数之下临（这是运的位置），上应经天（天上的星象）。
十干起运化气歌
甲己之年为土运，乙庚之年为金运，丁壬之年为木运当值。
丙辛之年化气常居水，戊癸之年须寻火运。
十天干所化的五行，是由五天气各临其位而生化出来的。有人说在十二生肖中，只有龙善于变化，属辰（龙），每一位干支数至第三个遇到辰时，就随所属而转化。（例如甲寅年至丙辰年化为水，丙寅年至戊辰年化为火。）也有人说甲为刚木克制己为柔土，如同夫妇，从而成土；乙为柔木嫁给庚为刚金，从而成金；丁为阴火配壬为阳水，从而成木；丙为阳火娶卒（终/极）柔金，从而成水；戊为阳土娶癸为阴水，从而成火。这两种说法意思近似，但道理并非自然天成。
十二地支代表十二个月，如正月是寅月，二月是卯月。甲己之年，正月建丙寅；乙庚之年，正月建戊寅；丙辛之年，正月建庚寅；丁壬之年，正月建壬寅；戊癸之年，正月建甲寅。这是用十天干建于寅之上，观察其法则，以甲子年为始，也是因为六十甲子中最初建立的先建立，其次建立的次建立。所以丙寅为初，戊寅为次，根据先后顺序循环转动就可以看出来。前六十甲子纳音图中。（确立位置既已结束，又回转于其上，以联络其纪年的意义就很明白了。推算时辰贴用时，日干的用法与此相同。如果是五运中阴年不及的年份，大寒日交接初气，那天的时辰建干与年干相合的称为“干德符”，应当视为平气，不是太过也不是不及。略举此例以说明其应用罢了，图在后。）
[Diagram of the Origin Examples of Heavenly Five Movements]
Establishment of Movements by the Qi of the Five Heavens
The Qi of the Five Elements scatters and flows into the five directions of Heaven, recorded in the Five Heavens (referring to five sectors or asterism regions in the sky), and thus named to establish the laws of the Five Movements (Wu Yun).
The verse says:
Metal corresponds to the white color, located before the stars Kang, Di, Mao, and Bi;
Water corresponds to the black color, located among the stars Zhang, Ji, Lou, and Wei;
Wood corresponds to the blue/green color, located within the stars Wei, Shi, Liu, and Gui;
Fire corresponds to the red color, located beside the stars Niu, Nu, Kui, and Bi;
Earth corresponds to the yellow color, located below the degrees of the stars Xin, Wei, Jiao, and Zhen (this is the position of the movement), corresponding upwards to the celestial spheres.
Verse on Starting Movements and Transforming Qi by the Ten Heavenly Stems
In years of Jia and Ji, the Earth Movement prevails; in years of Yi and Geng, the Metal Movement prevails; in years of Ding and Ren, the Wood Movement takes its place.
In years of Bing and Xin, the transforming Qi often resides in Water; in years of Wu and Gui, one must seek the Fire Movement.
The Five Elements transformed by the Ten Heavenly Stems are generated and transformed by the Qi of the Five Heavens descending upon their respective positions. Some say that among the twelve zodiac animals, only the Dragon (Chen) is good at transformation; for each position, when the stem-branch count reaches three and encounters Chen, it transforms according to its affiliation (e.g., from Jia Yin to Bing Chen transforms into Water; from Bing Yin to Wu Chen transforms into Fire). Others say that Jia (Yang Wood) controls Ji (Yin Earth), like a husband and wife, thereby forming Earth; Yi (Yin Wood) marries Geng (Yang Metal), thereby forming Metal; Ding (Yin Fire) pairs with Ren (Yang Water), thereby forming Wood; Bing (Yang Fire) marries the ultimate Yin Metal, thereby forming Water; Wu (Yang Earth) marries Gui (Yin Water), thereby forming Fire. These two theories have similar meanings but their principles are not naturally inherent.
The twelve Earthly Branches represent the twelve months, such as the first month being Yin and the second month being Mao. In years of Jia and Ji, the first month establishes Bing Yin; in years of Yi and Geng, the first month establishes Wu Yin; in years of Bing and Xin, the first month establishes Geng Yin; in years of Ding and Ren, the first month establishes Ren Yin; in years of Wu and Gui, the first month establishes Jia Yin. This uses the Ten Heavenly Stems established upon Yin. Observing this method, starting with the Jia Zi year, it is because within the sixty Jia Zi cycle, those established first are established first, and those established subsequently are established subsequently. Thus, Bing Yin is primary, and Wu Yin is secondary; following the order of precedence and rotation makes this visible. [In the diagram of the Melodic Nature of the First Sixty Jia Zi...] (Once the establishment of positions is completed, it returns above to connect its chronology, which clarifies the meaning. The method of applying the Day Stem to the Hour Establishment is the same. If it is a deficient year of an Yin Movement in the Five Movements, when the Great Cold solar term transitions to the First Qi, if the Hour Stem established on that day matches the Year Stem, it is called "Gan De Fu" (Harmony of Stems), which should be considered as Ping Qi (Balanced Qi), neither excessive nor deficient. This is briefly mentioned to illustrate its application; the diagram follows.)