Piercing Mountain Dragons: 60 and 72 Dragon Systems (穿山七十二龍與透地六十龍)
Among the most refined precision systems in classical San He Feng Shui are the Dragon subdivision methods. They decompose the compass below the standard 24 Mountains, allowing a practitioner to distinguish the quality of Dragon Qi (龍氣), void positions, and Na Yin elemental tone at a burial or dwelling site.
Earth-Penetrating 60 Dragons (透地六十龍)
The corrected Tou Di 60-Dragon sequence is not the ordinary Jiazi cycle laid evenly around the compass. It begins at the Ren sector with the Zi-branch group Jia Zi, Bing Zi, Wu Zi, Geng Zi, Ren Zi, then continues through double-mountain branch groups: Ren/Zi, Gui/Chou, Gen/Yin, Jia/Mao, Yi/Chen, Xun/Si, Bing/Wu, Ding/Wei, Kun/Shen, Geng/You, Xin/Xu, and Qian/Hai. In each five-dragon group the middle dragon straddles the double-mountain boundary, so the ring must be read as a double-mountain precision layer rather than a generic 6-degree Jiazi wheel.
60-Dragon Quality and Na Yin
The L2 correction restores the operational quality labels: Bing, Ding, Geng, and Xin dragons are Precious Jewel (珠寶); Wu and Ji dragons are Fire Pit or Sha Luminary (火坑/煞曜); Jia, Yi, Ren, and Gui dragons are Misaligned Void (差錯空亡), also explained in some summaries as Gu/Xu (孤虛). Every active dragon should expose its standard 60-Jiazi Na Yin (納音) element and name, such as Ocean Metal (海中金), Furnace Fire (爐中火), or Great Forest Wood (大林木), because the Na Yin tone is part of the field judgement.
Piercing Mountain 72 Dragons (穿山七十二龍)
The corrected Chuan Shan 72-Dragon sequence also uses branch groups, not a straight 60-cycle repeat. It starts with Jia Zi at the end of the Earth Plate Ren mountain, then each branch group contains five active Jiazi dragons followed by one Great Void (大空亡) sector. The 12 Great Void positions sit at the centers of the eight stems and four corner trigrams (八干四維): Gui, Gen, Jia, Yi, Xun, Bing, Ding, Kun, Geng, Xin, Qian, and Ren in the rotated implementation ledger.
Yang Gong Five Qi
For Chuan Shan quality, the corrected Yang Gong five-qi rule is stem-based: Jia and Ren are Gu (孤), Yi and Gui are Xu (虛), Wu and Ji are Turtle-Shell Void or defeated qi (龜甲空亡/敗氣), Bing and Geng are flourishing (旺), and Ding and Xin are assisting (相). The center void sectors remain Great Void (大空亡). As with the 60 Dragons, the active rows expose Na Yin element and Na Yin name so the Dragon reading can be cross-checked against the site, water mouth (水口), and intended use.
Relationship to 120 Gold Divisions
The Dragon rings belong to the same precision family as the 120 Gold Divisions, but they answer a different question. The 120 divisions refine mountain lines at 3 degrees, while the 60 and 72 Dragon systems classify the arriving or penetrating Dragon Qi. A field reading should first establish landform and Luopan orientation, then use these rings only where the site demands this level of precision.