Hidden Stems in Saju: What Each Branch Holds Inside
The calculator says your chart has no Metal. Then a saju reader tells you there is Metal hidden in your Dog. Who is right? Both. The eight visible characters are only the surface. Inside each earthly branch sit one to three heavenly stems, the hidden stems: jijanggan (지장간, 支藏干) in Korean, "the stems stored in the branches". Learning to read them is the biggest single step from a beginner's view of a chart to a practitioner's.
A branch is a month, not a moment
A heavenly stem is one pure quality. Jia is Yang Wood and nothing else. A branch is different: each of the twelve governs one solar month of the saju calendar, and a month has a beginning, a middle and an end. Korean tables describe that passage with up to three stems.
- Residual qi (yeogi, 여기, 餘氣): the opening days, still colored by the month before.
- Middle qi (junggi, 중기, 中氣): a passing influence in the middle of the month.
- Main qi (bongi, 본기, 本氣): the month's own character, which takes over and gives the branch its element.
The pattern follows the seasons. The four branches at the heart of a season, the Rat, Rabbit, Horse and Rooster, are the purest; three of them hold only a trace of the previous month plus their main qi. The four that open a season, the Tiger, Snake, Monkey and Pig, carry the element being born there: Bing Fire inside the Tiger, Geng Metal inside the Snake, Ren Water inside the Monkey, Jia Wood inside the Pig. The four that close a season, the Dragon, Goat, Dog and Ox, are storehouses, each holding the element whose season is being put away: Water in the Dragon, Wood in the Goat, Fire in the Dog, Metal in the Ox.
The twelve branches and their hidden stems
This is the table Sajucheop uses, in the Korean order from residual to main qi. The rows start with the Tiger because the saju year does: each branch governs the stretch from one jeol (절, 節) solar term to the next, beginning early in the month shown.
| Branch | Month | Residual qi | Middle qi | Main qi |
|---|---|---|---|---|
| 寅 Tiger | Feb–Mar | 戊 Wu, Earth | 丙 Bing, Fire | 甲 Jia, Wood |
| 卯 Rabbit | Mar–Apr | 甲 Jia, Wood | — | 乙 Yi, Wood |
| 辰 Dragon | Apr–May | 乙 Yi, Wood | 癸 Gui, Water | 戊 Wu, Earth |
| 巳 Snake | May–Jun | 戊 Wu, Earth | 庚 Geng, Metal | 丙 Bing, Fire |
| 午 Horse | Jun–Jul | 丙 Bing, Fire | 己 Ji, Earth | 丁 Ding, Fire |
| 未 Goat | Jul–Aug | 丁 Ding, Fire | 乙 Yi, Wood | 己 Ji, Earth |
| 申 Monkey | Aug–Sep | 戊 Wu, Earth | 壬 Ren, Water | 庚 Geng, Metal |
| 酉 Rooster | Sep–Oct | 庚 Geng, Metal | — | 辛 Xin, Metal |
| 戌 Dog | Oct–Nov | 辛 Xin, Metal | 丁 Ding, Fire | 戊 Wu, Earth |
| 亥 Pig | Nov–Dec | 戊 Wu, Earth | 甲 Jia, Wood | 壬 Ren, Water |
| 子 Rat | Dec–Jan | 壬 Ren, Water | — | 癸 Gui, Water |
| 丑 Ox | Jan–Feb | 癸 Gui, Water | 辛 Xin, Metal | 己 Ji, Earth |
Tables differ a little between schools. Many Chinese BaZi references list a single hidden stem for the Rat, Rabbit and Rooster and two for the Horse and Pig, while Korean month-division tables add a residual qi to each, as above. Older texts go further and give each hidden stem a share of the month's days, and those shares vary from book to book. Sajucheop doesn't weight them: it takes a branch's element and Ten God from the main qi and treats the other stems as secondary. Our guide to saju and BaZi covers other differences between the two traditions.
How hidden stems change the element count
Take a chart born in Seoul on 19 March 1994 at 10:20 a.m.: a 甲戌 Jia Xu year, 丁卯 Ding Mao month, 甲辰 Jia Chen day and 己巳 Ji Si hour. The Day Master is Jia, the Tall Pine.
Count the eight visible characters, one element each, and you get what the calculator's Five Elements bar shows: Wood 3, Fire 2, Earth 3, Metal 0, Water 0. Two elements are missing.
Now open the four branches. The Dog (戌) holds 辛 Metal, 丁 Fire and 戊 Earth. The Rabbit (卯) holds 甲 and 乙, both Wood. The Dragon (辰) holds 乙 Wood, 癸 Water and 戊 Earth. The Snake (巳) holds 戊 Earth, 庚 Metal and 丙 Fire. Metal turns up twice and Water once. Neither was missing after all; both were stored out of sight.
| Count | Wood | Fire | Earth | Metal | Water |
|---|---|---|---|---|---|
| Visible characters (main qi only) | 3 | 2 | 3 | 0 | 0 |
| Four stems plus every hidden stem | 5 | 3 | 4 | 2 | 1 |
Don't read the second row as a new score, though. It counts a residual trace as fully as a main qi, which overstates the minor stems. The fair summary is that this chart is short on Metal and Water but not empty of them. They exist as potential, the kind that tends to surface when a year or a luck pillar brings the same stem into the open.
How hidden stems change the Ten Gods
A branch's Ten God comes from its main qi, which is why the calculator lists seven labels for a chart with a birth time. For this Jia Day Master they are Friend (甲), Hurting Officer (丁), Direct Wealth (己), Indirect Wealth twice (the Dog and the Dragon), Rob Wealth (the Rabbit) and Eating God (the Snake). Peers, Output and Wealth are all present. Authority and Resource are not.
The hidden stems supply both. 辛 in the Dog is Direct Officer, 庚 in the Snake is Seven Killings and 癸 in the Dragon is Direct Resource. A reader would say this person has a sense of duty and a capacity for study that don't advertise themselves: real, but held in reserve.
Two more ideas come from the same layer. A Day Master that finds its own element among the hidden stems is said to have roots (tonggeun, 통근, 通根), and roots are a large part of how strength is judged. Here Jia is rooted in the Rabbit, whose stems are pure Wood, and more lightly in the Dragon through its residual 乙. And when a hidden stem also shows up among the heavenly stems, Korean readers call it revealed (tuchul, 투출, 透出): it has both a root and a face, and it tends to act strongly. The 丁 inside the Dog appears as the month stem, so this chart's Hurting Officer is revealed and rooted, one reason expression is among its loudest voices.
Why the month branch matters most
If you open only one branch, open the month. It is the season you were born into, which Korean texts call wollyeong (월령, 月令), the command of the month, and it sets the temperature of the whole chart. That is why Sajucheop's strength score counts the month branch double. It is also where classical structure analysis starts. In the method associated with the Qing-era text Ziping Zhenquan (자평진전, 子平眞詮), a chart's structure (gyeokguk, 격국, 格局) is named from the month branch, usually from whichever of its hidden stems is revealed among the heavenly stems.
In our example the month branch is the Rabbit, the peak of spring, and both of its hidden stems are Wood, the Day Master's own element. Jia also stands in the year stem, so the month's Wood is revealed on the surface: a Pine born in its own season. Yet Earth and Fire crowd the rest of the chart, and our quick score calls this Day Master balanced, only just clear of the weak line. Weighing the season against the crowd is the judgment our guide to Day Master strength walks through.
Reading hidden stems without overdoing it
- Main qi first. A branch's main qi carries most of its weight; residual and middle qi add color. Two minor Metal stems don't make a chart Metal-rich.
- Hidden means private, not powerless. Readers often describe hidden Ten Gods as abilities a person keeps in reserve: less visible to others, but available.
- Timing draws them out. When a luck pillar or year brings a hidden stem into the open, many readers expect its theme to rise. For the example chart, a Metal year would put its hidden Authority on stage.
- The Day Branch is personal. The hidden stems of your Day Branch describe your inner room and your spouse seat, which is why each of our Day Pillar pages lists them.
Cast your chart on the calculator, then find each of your four branches in the table above. Your Day Branch has its own page among the 60 Day Pillars, with every hidden stem, its Ten God and the main qi marked. To put names to what you find, keep the Ten Gods guide open alongside.
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