五天苍丹 玄素，天气天干合化临，甲
己化土丙辛水，丁壬化木乙庚金，戊癸化火五客运，起以中运相生轮。阴少乙丁己辛癸，
阳太甲丙戊庚壬。
【注】五天者，苍天，天之色青者也；丹天，天之色赤者也； 天，天之色黄者也；玄
天，天之色黑者也；素天，天之色白者也。天气者，苍天之气，木也；丹天之气，火也；
天之气，土也；玄天之气，水也；素天之气，金也。天干者，甲、乙、丙、丁、戊、己、庚、
辛、壬、癸也。古圣仰观五天五气，苍天木气下临丁壬之方，故识丁壬合化而生木运也；
丹天火气下临戊癸之方，故识戊癸合化而生火运也； 天土气下临甲己之方，故识甲己
合化而生土运也；玄天水气下临丙辛之方，故识丙辛合化而生水运也；素天金气下临乙庚
之方，故识乙庚合化而生金运也，此天气天干合化，加临主运五位之客运也。起以所化，
统主本年中运为初运，五行相生，以次轮取。如甲己之年，土运统之，起初运。土生金为
二运，金生水为三运，水生木为四运，木生火为五运。余四运皆仿土运起之。乙、丁、己、
辛、癸属阴干，为五阴年，主五少不及之运。甲、丙、戊、庚、壬属阳干，为五阳年，主
五太太过之运也。
\r客运图\ps110-4a9.bmp\r
五天（苍天、丹天、苍天、玄天、素天）对应五行之气，天气与天干相合化生，依次加临。甲己合化为土，丙辛合化为水，丁壬合化为木，乙庚合化为金，戊癸合化为火，这构成了五客运的规律，起始于中运（主运），按五行相生顺序轮转。阴干包括乙、丁、己、辛、癸；阳干包括甲、丙、戊、庚、壬。
【注】所谓“五天”，是指苍天（天的颜色为青色）、丹天（天的颜色为赤色）、黄天（天的颜色为黄色）、玄天（天的颜色为黑色）、素天（天的颜色为白色）。所谓“天气”，是指苍天之气，属木；丹天之气，属火；黄天之气，属土；玄天之气，属水；素天之气，属金。天干有十个：甲、乙、丙、丁、戊、己、庚、辛、壬、癸。古代圣人仰观五天五气，发现苍天之木气下临于丁壬方位，因此认识到丁壬合化而生木运；丹天之火气下临于戊癸方位，因此认识到戊癸合化而生火运；黄天之土气下临于甲己方位，因此认识到甲己合化而生土运；玄天之水气下临于丙辛方位，因此认识到丙辛合化而生水运；素天之金气下临于乙庚方位，因此认识到乙庚合化而生金运。这就是天气与天干合化，加临于主运五位之上的客运规律。起始于所化的运气，统领本年的中运作为初运，按照五行相生次序依次轮转。例如甲己之年，由土运统领，起初运为土；土生金为二运；金生水为三运；水生木为四运；木生火为五运。其余年份的客运都仿照土运起始的方法推算。乙、丁、己、辛、癸属于阴干，称为五阴年，主管五种“少”（不及）的运；甲、丙、戊、庚、壬属于阳干，称为五阳年，主管五种“太”（太过）的运。
The Five Heavens (Cang, Dan, Huang, Xuan, Su) correspond to the Qi of the Five Elements. The Heavenly Qi combines with the Heavenly Stems to transform and descend sequentially. Jia and Ji transform into Earth; Bing and Xin transform into Water; Ding and Ren transform into Wood; Yi and Geng transform into Metal; Wu and Gui transform into Fire. These constitute the pattern of the Five Moving Yuns (Ke Yun), starting from the Central Yun (Zhu Yun) and rotating according to the generation cycle of the Five Elements. The Yin stems are Yi, Ding, Ji, Xin, Gui; the Yang stems are Jia, Bing, Wu, Geng, Ren.
[Note] The term "Five Heavens" refers to Cang Tian (the sky appears green), Dan Tian (the sky appears red), Huang Tian (the sky appears yellow), Xuan Tian (the sky appears black), and Su Tian (the sky appears white). The term "Heavenly Qi" refers to: the Qi of Cang Tian belongs to Wood; the Qi of Dan Tian belongs to Fire; the Qi of Huang Tian belongs to Earth; the Qi of Xuan Tian belongs to Water; the Qi of Su Tian belongs to Metal. There are ten Heavenly Stems: Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui. Ancient sages observed the Five Heavens and their Five Qis. They saw that the Wood Qi of Cang Tian descended upon the direction of Ding and Ren, thus recognizing that Ding and Ren combine to generate the Wood Yun; the Fire Qi of Dan Tian descended upon the direction of Wu and Gui, thus recognizing that Wu and Gui combine to generate the Fire Yun; the Earth Qi of Huang Tian descended upon the direction of Jia and Ji, thus recognizing that Jia and Ji combine to generate the Earth Yun; the Water Qi of Xuan Tian descended upon the direction of Bing and Xin, thus recognizing that Bing and Xin combine to generate the Water Yun; the Metal Qi of Su Tian descended upon the direction of Yi and Geng, thus recognizing that Yi and Geng combine to generate the Metal Yun. This is how the Heavenly Qi and Heavenly Stems combine and transform, descending upon the five positions of the Main Yun as the Moving Yun. It begins with the transformed Yun, which governs the Central Yun of the current year as the First Yun, rotating sequentially according to the generating cycle of the Five Elements. For example, in years of Jia and Ji, the Earth Yun governs, so the First Yun is Earth; Earth generates Metal for the Second Yun; Metal generates Water for the Third Yun; Water generates Wood for the Fourth Yun; Wood generates Fire for the Fifth Yun. The Moving Yuns for other years are calculated following this method for Earth Yun. Yi, Ding, Ji, Xin, and Gui belong to the Yin stems, known as the Five Yin Years, governing the Five "Shao" (Deficient/Insufficient) Yuns. Jia, Bing, Wu, Geng, and Ren belong to the Yang stems, known as the Five Yang Years, governing the Five "Tai" (Excessive/Superabundant) Yuns.