五运六气 · 运气推演仪
立年干支以纪运气，推主客之加临、胜复之郁发、病机之治则——一器尽览天人之纪
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五气经天 · 星穹模拟
丹黅苍素玄五色天气横亘二十八宿，下临十干之位而化五运 —— 拖动旋天，点带识气
盖天式示意图：二十八宿依十二次分野布于十二辰（《汉书·律历志》次度），地盘为二十四山， 戊寄乾为天门、己寄巽为地户；非实测星图，意在明「十干化运」之天象所本。
十干化运 · 由象而立
五气两端所临之干，即其所化之运；阳干太过，阴干不及
| 天气 | 所经之宿 | 两端临干 | 化运 | 经文 |
|---|---|---|---|---|
| 丹天之气 | 奎壁 ↔ 牛女 | 戊（阳·太过） 癸（阴·不及） | 戊癸化火 | 丹天之气，经于牛女戊分 |
| 黅天之气 | 心尾 ↔ 角轸 | 甲（阳·太过） 己（阴·不及） | 甲己化土 | 黅天之气，经于心尾己分 |
| 苍天之气 | 柳鬼 ↔ 危室 | 丁（阳·太过） 壬（阴·不及） | 丁壬化木 | 苍天之气，经于危室柳鬼 |
| 素天之气 | 亢氐 ↔ 昴毕 | 乙（阳·太过） 庚（阴·不及） | 乙庚化金 | 素天之气，经于亢氐昴毕 |
| 玄天之气 | 张翼 ↔ 娄胃 | 丙（阳·太过） 辛（阴·不及） | 丙辛化水 | 玄天之气，经于张翼娄胃 |
本岁 丙午：年干丙属丙辛化水， 故岁运为 水运太过（流衍之纪）。
经文与释义
夫候之所始，道之所生，不可不通也
臣览《太始天元册》文：丹天之气，经于牛女戊分；黅天之气，经于心尾己分；苍天之气，经于危室柳鬼；素天之气，经于亢氐昴毕；玄天之气，经于张翼娄胃。所谓戊己分者，奎壁角轸，则天地之门户也。夫候之所始，道之所生，不可不通也。
古人仰观天象，见五色气横亘于二十八宿之间：其两端所指向的天干方位，便是该色之气「下临」之地。 丹（赤）气两端临戊、癸，故戊癸之年火运统岁；黅（黄）临甲、己而化土；苍（青）临丁、壬而化木； 素（白）临乙、庚而化金；玄（黑）临丙、辛而化水 —— 十干化运并非人为约定，而是「天垂象」的记录。
戊己所寄的奎壁（乾）与角轸（巽），一名天门、一名地户：奎壁当秋分之交、天气渐收，角轸当春分之交、地气始升， 故曰「天地之门户」。此象为中运（岁运）之总纲，与年支所主的司天在泉相合，方成一岁运气之全局 —— 地盘上的朱标即本岁司天、墨标即在泉，可与「运气推演」分篇互证。
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