《周易参同契》的月体纳甲学

《周易参同契》所推阐的金丹原理，将丹道与易道结合，运用汉代象数易学的成果，巧妙地阐明了修炼金丹的道理和方法。它的“月体纳甲说”用周易八卦模拟月体在太空运行过程中，一月之内所出现的晦朔弦望之盈虚变化，并以其出没方位作为纳甲的依据。它的“乾体六爻模拟月相说”，以乾六爻之象模拟月体的晦朔弦望，以明阴阳的消长变化。它的“十二消息卦变说”，以十二辟卦论说周天火候，以明进阳火和退阴符之分。

The Theory of Yue-ti-na-jia in Zhou Yi Can Tong Qi

Zhou Yi Can Tong Qi (written by WEI Bo-yang) combines the cinnabar ref ining theory and the theory of I-ching learning into one, and bases on the achi e vements of the Xiang-shu (image-number) school of the Han Dynasty, to deduce a nd elaborate how to refine Jin-dan (golden cinnabar). Of this book, Yuetina jia theory brings the moon's waxing and waning on the 3rd, 8th, 15th, 16th, 23rd, 30 th days' dawns of a lunar month, and the ten Heavenly Stems into the system of t he eight trigrams. Another theory expounded in the book called Qiantiliuya om oniyuexiangshou takes advantage of the images of the six lines of the he xagr am of Qian simulating and symbolizing the waxing and waning of the moon, to illu strate decreasing and increasing of Yin and Yang. The twelve monthly hexagrams' changing theory introduced in the book bases the twelve hexagrams related to 12 lunar months to designate different states in the refining, to expound the demar cation and transformation between Yin and Yang.