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或问：地支有属相，而天干则无者，何也？答曰：天干动而无相，地支静而有相。盖轻清者天也，重浊者地也，重浊之中，乃有物焉。故子属鼠，丑属牛，寅属虎，卯属兔，辰属龙，巳属蛇，午属马，未属羊，申属猴，酉属鸡，戍属犬，亥属猪。此十二属相亦有奇偶之分，盛衰之用。奇者鼠、虎、龙、马、猴、犬，一则属阳，六兽之足皆单；偶者牛、兔、蛇、羊、鸡、猪，二则属阴，六兽之足皆双。唯蛇无足又何取义？盖巳在月二乃纯阳之月，在时乃春阳之时，数则偶而时则阳，故用蛇以象之，蛇乃阴物，不用其足而象巳着疑，亦讳言乎阴之意尔，况亦有双头者。可验十二相即三十六禽中取其首者拟之，自有阴阳之别，单双之分，此造化之所以为妙也。
寅，木也，其禽虎，戌，土也，其禽犬，丑、未亦土也，丑禽牛，未禽羊，木胜土，故犬与牛羊为虎所服；亥，水也，其禽豕，巳，火也，其禽蛇，子亦水也，其禽鼠，午亦火也，其禽马，水胜火，故豕食蛇，火为水所害，故马食鼠屎而腹胀。然亦有不相胜者。午，马也，子，鼠也，酉，鸡也，卯，兔也，水胜火，鼠何不逐马？金胜木，鸡何不啄兔？亥，豕也，未，羊也，丑，牛也，土胜水，牛羊何不杀豕？巳，蛇也，申，猴也，火胜金，蛇何不食猕猴？猕猴，畏鼠者也，啮猕猴者，犬也。鼠，水，猕猴，金也，水不胜金，猕猴何故畏鼠？戌，土也，申，猴也，土不胜金，猴何故畏犬？十二辰之禽以气性相克则尤不相应。大凡含血之虫相服，至于相啖食者，以齿牙钝利、筋力优劣自相胜服也。
The Earthly Branches correspond to the twelve zodiac animals, while the Heavenly Stems have no associated animals. Why is this? This is because the Heavenly Stems symbolize the dynamic and formless way of heaven, whereas the Earthly Branches represent the static and tangible phenomena of earth. The earth is thick, heavy, and turbid, capable of nurturing all things. Therefore:
The twelve zodiac animals are divided into odd/even and yang/yin:
Special Note: Why is the Snake, which has no feet, classified as Yin? Because the Si month (the fourth lunar month) is a month of pure Yang 🌞, and the Si hour (9-11 AM) is a time of rising Yang energy. While its numerical association is even, the hour itself is Yang. Therefore, the Yin creature Snake is used to symbolize the harmony of Yin and Yang. The ancients avoided directly mentioning "Yin," hence the choice of the footless snake implies duality (as evidenced by the concept of two-headed snakes).
The zodiac animals originated from a simplification of the Thirty-Six Animals. Their classification into Yin/Yang and odd/even reflects the exquisite ingenuity of creation ⛰️.
The ancients attempted to use the Five Elements to explain animal conflicts, but logical inconsistencies exist:
| Five Elements Relation | Animal Manifestation | Contradiction Point |
|---|---|---|
| Wood overcomes Earth: Tiger (Yin Wood) subdues Dog/Ox/Goat (Xu/Chou/Wei Earth) | ✅ Conforms | — |
| Water overcomes Fire: Pig (Hai Water) eats Snake (Si Fire) | ✅ Conforms | But Rat (Zi Water) does not drive away Horse (Wu Fire) ❓ |
| Metal overcomes Wood: Rooster (You Metal) does not peck Rabbit (Mao Wood) ❓ | ⚠️ Does not conform | — |
| Earth overcomes Water: Ox/Goat (Chou/Wei Earth) do not kill Pig (Hai Water) ❓ | ⚠️ Does not conform | — |
Key Conclusion: The checks and balances among animals are essentially competition based on physical strength (e.g., sharp teeth, muscular power) 🌪️, not a mechanical application of the Five Elements cycle.
When constructing the zodiac system, the ancients pursued logical consistency (e.g., odd/even classification) while candidly acknowledging contradictions (e.g., the questionable notion that "monkeys fear rats"). This attitude of coexistence of truth-seeking and tolerance is precisely the legacy traditional wisdom offers to the modern era: any theoretical model requires iteration in practice 🌱.