推荐回答（1个）
七十二龙没有空亡龙。杨公创制了七十二龙是因为当初杨公在风水实践中觉得双山五行过于 粗糙。所以交将双山细分为七十二龙，其实当初杨公在创造七十二龙时并没有空亡龙之说，只是在中国这种文化背景下，风水在师承过程中将八干四维十二正龙，密而不传或只传内不传外，只传子不传女，所以就造成今天罗盘上的八干四维没有甲子，也就是没有五行的记号，就是所说的空亡龙。
风水的创制原理本自阴阳，阴阳是古代先贤原来代表自然天地的两种属性，大千世界皆属阴阳，阴阳无处不在，无处不有，天地为大阴大阳，阴中有阳，阳中有阴，阴极则阳生，阳极则阴生。再微小的东西也有阴阳属性。阴阳为两仪，然后生四象，就有了四方的东西南北、上下左右，再加上中间就是我们所说的五行方位，东属木、西属金、南属火、北属水、中属土。杨公就是根据五行和阴阳创制了七十二龙，即将南方分为巳午未，北方为亥子丑，东方为寅卯辰，西方的为庚酉辛十二山，又将十二山各分为二，变成现在的二十四山。分出来的山在以甲乙丙丁庚辛壬癸八干及乾坤艮巽四维分别记之。也就是说在风水实践中将周天360度分为二十四分，每份15度，也就是每山15度。15度范围过大，不够准确精度，杨公又根据阴阳原理，阴中有阳，阳中有阴。推演为五行中又有五行，即，木行中包含金木水火土五行，金行中也包含了金木水火土五行属性。所以，杨公将周天360度的每一度都贯以五行属性，度度有五行属性。就好像地球绕太阳公转360度一样，天天有甲子，天天有五行，周而复始。在风水实践中发现及理论结合，将完整的具有金木水火土的五度组成一座山，就成了现在的七十二龙中的一龙，也就是一山。这一龙包含了五行的属性，就包含了天地的五气，也包含了天地的阴阳。将五度组成了一龙贯以五行属性，所以山山有五行，就成了七十二龙的五行属性，分别用六十甲子的纳音五行代表记之。如：甲子龙、乙丑龙皆属金的纳音，就记为金龙。十干与十二支搭配只有六十组，还有十二龙，即以六十甲子中的其中之十二的纳音记之。加起来就成了七十二龙的五行属性。杨公就以此七十二龙的五行属性来定龙步水定局，消砂纳水。所以，七十二龙就不存在有空亡龙之说。
大量的风水实践考察证明这一理论，资料考证也证明了这一理论的合理性。
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