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地支之用，不比天干，动静不同，圆方迥异。然五行所属则一，而所处之地不一。且如在年则有在年之论，在月则有在月之论，在日时则有日时之论，其阴阳、轻重、刚柔岂混于一体？今当以月提为主，所藏所用，要见何神，所耗所嫌，要系何物。凡四柱之神，较量深浅而用。
子十二支之魁，溪涧江洋之水，乃戊土旺地，然必过大雪之期，一阳来复之后，方能成旺。辛金所生，亦必于阳回水暖而后能生也。与午相冲，与卯相刑，与申辰三合。若申、子、辰全，会起水局，即成江海，发波涛之声也。
丑虽隆冬，有冰霜之可怯，但天时已转二阳，是以丑中己土之暖能生万物，辛金养地，岂只深藏？见戌则刑，见未则冲， 库地最宜，刑冲不为无用。见巳、酉三合，会起金局。若人命生于丑月，而日时多见水木，必侧行巽离之地，而土方不衰耳。
寅建于春，气聚之阳，有丙火生焉。寅刑巳，巳合申并旺而为贵客；旺于卯，库于未，同类则为一家。至午则火光辉，而有超凡入圣之美。见申则寅受冲，而有破禄伤提之忧。若四柱火多，则又不可入南方火地。经云：木不南奔。卯木仲春，气禀繁华，唱用金水，不可太过。若干头庚辛迭见，地支不可见申酉，恐有破伐之害；地支亥子重逢，干头不可见癸壬，主有漂流之伤。见酉则冲，木必落叶，见亥未则合，木必成林。若时日归于金重，大运更向西行，患不禁也。
辰建季春，为水泥之湿，而万物之根皆赖此培养。甲至此虽衰，而有乙之余气；壬至此虽墓，而有癸之还魂；见戌为钥，能开库中之物，若三戍重冲破门，非吉。日时多见水木，其运更向西北，则辰土不能存矣。
巳当初夏，其火增光，是六阳之极也。庚金寄生，困顿戊母。戊土归禄，乃随火娘。见申则刑，刑中有合，翻为无害；见亥则冲，冲而必破便为有伤。若运再行东南生发之地，便成烧天烈焰之势矣。
午月炎火正，升入中气则一阴生也。庚至此为无用，己至此为归垣；见申子则必战克，见寅戌则越光明。运行东南，正是身强之地，若入西北，则休囚丧形矣。
未当季夏，则阴深而火渐衰。未中有乙木，有丁火，是藏官，藏印，不藏财也。无亥卯以会之，则形难变，只作火土论； 无丑戌以刑冲之，则库不开，难得金印。力柱中无火，怕行金水之运，日时多寒，偏爱丙丁之乡。盖用神之喜忌最当分晓，不可毫发误也。
申宫水土长生之地，入巳、午则逢火炼，遂成剑戟，见子、辰则逢水淬，益得光锋；使木多无火，金终能胜，若土重堆埋，金却有凶。盖申乃顽钝之金，与温柔珠玉不同故也。
酉建八月金色，白水流清。若遇日时火多，运更愁东去；若遇日时水旺，运亦怕南行。柱见水泥，应为有用，运行西北， 岂是无情？然逢己丑三合，亦能坚锐，岂可以阴金为温柔珠玉而泥论哉？
戌乃洪炉之库，钝铁顽金，赖以炼成。见辰龙则冲出壬水，而雨露生焉；见寅虎则会起丙火，而文章出焉。然火命逢之则为入墓，宁能免于不伤哉？
亥地六阴，雨雪载途，土至此而不暖，金至此而生寒。其象若五湖之归聚，其用在三合之有心。是故欲识乾坤和暖之处，即从艮、震、巽、离之地而寻之也。
大抵五行用法，总无真实，生死衰旺，亦假名耳。直向源头，明其出处，如五阳为刚，五阴为柔。若失令身衰，不遇资扶而频泄气，则刚者失其为刚；若得令身强，用事有助，则柔者不失之柔。中间又分木火为阳，金水为阴，皆喜生扶资助，要以中和为贵。
The application of Earthly Branches differs from that of Heavenly Stems, with distinctions in movement and stillness, and varied forms, yet their Five Element nature is the same. Differences arise from their positions (Year, Month, Day, Hour). It is essential to take the Month Branch as the guiding principle, analyze the hidden Five Elements and the relationships of favorable/unfavorable affinities, and flexibly select and apply them by comprehensively assessing the depth of power among the Four Pillars.
Dynamic Balance: The energy of Earthly Branches is not a fixed label; it requires comprehensive judgment combining position, solar term, and harm/clash/combination relationships. "Harmony is most valued" is the ultimate principle of the Five Elements' generation and overcoming.
graph LR
Energy Assessment (Five Elements Depth) --> Conflict Identification (Harm/Clash/Combination)
--> Solution (Useful God Control/Transformation) --> Spatio-Temporal Adaptation (Luck Cycles & Direction)
| Earthly Branch Trait | Suitable Fields |
|---|---|
| Shen/You Metal | Precision Manufacturing, Finance |
| Yin/Mao Wood | Education, Environmental Protection, Creativity |
| Si/Wu Fire | Energy, Media, Internet |
Dialectics of Hardness and Softness: "Out of season and body weak, the hard loses its hardness; in season and body strong, the soft is not soft" — Strength and weakness can transform. The key lies in conforming to natural laws (being in season) and utilizing external support (generation and assistance).
| Related Concepts | Further Reading | Modern Research |
|---|---|---|
| Hidden Stems in Branches | Yuan Hai Zi Ping - On Human Element Affairs | Research on correlation between Earthly Branch energy fields and geographical magnetic fields |
| Logic of Harm/Clash/Break/Hurt | Wu Xing Jing Ji - Volume 3 | Application of clash/combination relationships in conflict management |
| Month Branch Climate Model | Qiong Tong Bao Jian - Adjustment Chapter | Comparison between ancient solar term systems and agricultural meteorology |