Kinh điển lý khí về tam hợp, song sơn, và cách dùng la kinh. Giải thích quan hệ long–hướng–thủy theo đường lộ và huyền空. Là xương sống của phái “Dương công” sau này.
Ứng dụng: Luận hướng long, thủy khẩu, lập hướng theo tam hợp / huyền không
旧题唐·杨筠松，理气玄空最重经典；宋前文献无名，明末蒋大鸿注疏后大行。内传论三般卦（江东、江西、南北）、父母、雌雄、上山下水、零正、排龙。开篇：江东一卦从来吉，八神四个一；江西二卦排龙位，八神四个二；南北八神共一卦。以二十四山分三卦、阴阳顺逆、玄空挨星论山向水神生克。与形法对举，专主理气元运。
⚡ Ứng dụng: 立向排龙、辨元运旺衰、论山水零正时，以三般卦与父母雌雄为纲。
🔗 Liên quan: 青囊奥语；青囊序；都天宝照经
It proves that pure form without heavenly order, and pure heavenly order without form, both fail: destiny crystallizes only where mountain-water geometry locks into the sexagenary and dragon-gate logic of time-space. The classic argues for a dual-key system—形 must admit 气, and 气 must be timed and oriented by celestial sequence.
1. Never judge a site by silhouette alone—map its facing, incoming dragon, and water exit onto stem-branch and star frames. 2. Use dual confirmation: form says 'can hold'; liqi says 'when/which type of luck.' 3. In BaZi work, treat external mountain-water as extended roots of the Day Master’s environment. 4. Prefer methods that can falsify a pretty site (e.g., water leaving on an outlawing position). 5. Train the eye to see 'false dragons'—forms that look strong but fail celestial coupling.
Compared with 青囊经’s cosmological skeleton, 天玉经 is more operational and technical, inserting star and branch mechanics into form. Compared with pure 理气 manuals, it still refuses to abandon mountain-water as the primary evidence—heaven annotates earth; it does not replace it.