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Heavenly Stems and Earthly Branches

Every pillar of Saju is a pair of characters: a heavenly stem and an earthly branch. There are ten stems (five elements in a yang and a yin form) and twelve branches (the zodiac animals). Their combination repeats once every sixty years — which is where the sixty-year measure of a human life in East Asia comes from.

The Ten Heavenly Stems (천간)

No.HanjaKoreanElementPolarity
1甲갑woodyang 陽
2乙을woodyin 陰
3丙병fireyang 陽
4丁정fireyin 陰
5戊무earthyang 陽
6己기earthyin 陰
7庚경metalyang 陽
8辛신metalyin 陰
9壬임wateryang 陽
10癸계wateryin 陰

The Twelve Earthly Branches (지지)

No.HanjaKoreanAnimal
1子자Rat
2丑축Ox
3寅인Tiger
4卯묘Rabbit
5辰진Dragon
6巳사Snake
7午오Horse
8未미Goat
9申신Monkey
10酉유Rooster
11戌술Dog
12亥해Pig

Ten stems and twelve branches combine in pairs, but not every pair is possible — even goes with even, odd with odd. That is why there are sixty combinations, not one hundred and twenty.

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