Earthly Branches and Hidden Stems

The twelve earthly branches (地支) are the lower characters of every pillar. Where stems are visible, branches are foundations: they carry the season, the roots of the stems above them and a set of hidden stems that can become active over time.

Months, hours and directions

Each branch marks a month (from its jie solar term), a two-hour period and a compass direction. 寅 is the first month of spring and the 03:00–05:00 hour; 午 is midsummer, the 11:00–13:00 hour and due south; 子 is midwinter, the 23:00–01:00 hour and due north. Each branch has its own guide on this site — see earthly branches.

Hidden stems

Every branch contains one to three stems:

The main qi (本气) is the branch's own element and carries most of its weight. Middle and residual qi are progressively weaker and reflect the branch's position in the season: 寅, at the start of spring, still holds a little of the fire and earth that come later in the cycle; 辰, at the end of spring, stores the water of the previous season.

Three kinds of branches

Practitioners often group the branches into three sets:

• Cardinal branches 子, 午, 卯, 酉 — the peaks of each season. Each is almost purely one element (午 also holds 己).
• Growth branches 寅, 申, 巳, 亥 — the beginnings of seasons, holding three stems including the next element's birth.
• Storage branches 辰, 戌, 丑, 未 — the ends of seasons, earth on the surface but storing water, fire, metal and wood respectively.

Storage branches are the most complex. Whether their stored element is accessible depends on clashes: a clash "opens" the storage, releasing its contents.

Roots

A stem is rooted when a branch in the chart contains the same element among its hidden stems. Roots are how a stem draws strength from the ground. A main-qi root counts more than a residual root, and roots in the month and day branches count more than roots in the year and hour. A Day Master with a strong root in the month is rarely weak.

Revelation

When a hidden stem also appears as a visible stem somewhere in the chart, it is revealed (透干). A revealed stem is both rooted and expressed, and is usually among the most influential factors in the chart. The month branch's revealed stem is often taken as the chart's structure.

Branches over time

Luck and annual pillars bring new branches. When one of them clashes or combines a natal branch, the natal branch's hidden stems are stirred. This is why the same natal branch can be quiet for years and then prominent: its contents are activated by time.

The twelve branches at a glance

Month dates vary by a day or so each year; the solar terms guide and the Chinese calendar converter give exact instants. Note that 巳 and 亥 are yin by position but their main qi stems 丙 and 壬 are yang, while 子 and 午 are yang by position with yin main qi 癸 and 丁. Ten Gods are always assigned by the hidden stem, not by the branch's own polarity.

Why hidden stems exist

The hidden stems describe the seasonal mix inside each month. Spring's first month 寅 still carries the earth of late winter and the first warmth of fire (丙), which will be born there. The storage branches 辰戌丑未 each hold the residue of the season just ending: 辰 holds 癸 water after winter, 未 holds 丁 fire after summer, 戌 holds 辛 metal after autumn, 丑 holds 辛 metal and 癸 water. This seasonal logic makes the table easy to reconstruct once you see it.

Using hidden stems in practice

1. Judge roots. For each branch, check whether any hidden stem shares the Day Master's element. This is the core of Day Master strength.
2. Name hidden Ten Gods. A Wealth star hidden in the day branch is still relevant, even if not visible.
3. Find the structure. The month branch's main qi — or whichever hidden stem is revealed — is the usual starting point for the chart's structure.
4. Watch activation. When a luck or annual branch clashes or combines a branch, its hidden stems become more active.

The hidden stems calculator lists every hidden stem with its Ten God for your chart, so you can do these steps directly.

Storage branches and opening

Storage branches deserve extra attention. A 辰 branch holds water in storage; if the chart needs water but has none visible, practitioners look for a 戌 clash (natal or from time) that opens 辰 and releases the water. Conversely, an unwanted element locked in storage is considered safer while closed. This is one of the subtler parts of reading branches and is best learned through examples.

Branches and the element count

Visible element counts treat each branch as one element. Weighted counts add hidden stems with lower weights. The five elements calculator shows both, which helps explain why a chart that looks short of an element may still contain it.

Learning the branches efficiently

Memorise the twelve in order with their element, then the four groups (cardinal, growth, storage), then the main qi of each. Middle and residual qi follow naturally from the seasonal logic above.

Worked example: reading one branch fully

Take the branch 申 in the day position for a 壬 water Day Master. 申 hides 庚 (main), 壬 (middle) and 戊 (residual).

• 庚 is metal, which produces water: Indirect Resource, and the main qi — a strong source of support.
• 壬 is the Day Master's own element: a Companion root.
• 戊 is earth, which controls water: Seven Killings, as a minor presence.

So the day branch alone gives the Day Master both Resource and a root — a strong seat. It also places a little Seven Killings in the spouse palace. Further, 申 is the birth branch (长生) for water in the twelve growth stages. If 子 and 辰 are also present, 申子辰 forms a water group, and the Day Master may become very strong.

Reading a branch in this layered way — main qi, middle, residual, growth stage, possible groups — is what turns twelve symbols into a detailed picture.

Branch clashes and hidden stems

When 寅 clashes 申, both branches' hidden stems are involved: 甲, 丙 and 戊 in 寅 against 庚, 壬 and 戊 in 申. The main-qi conflict is 庚 metal against 甲 wood, while 丙 fire and 壬 water also oppose each other. A reader checks which of these hidden stems are useful to the chart to judge whether the clash helps or harms. The combinations and clashes guide lists every pair.

Key points

• The twelve branches mark months (from the jie terms), two-hour periods and directions.
• Every branch hides one to three stems: main qi, middle qi and residual qi, in decreasing strength.
• Hidden stems follow seasonal logic. Growth branches contain the next element's birth, and storage branches hold the residue of the season just ending.
• Cardinal, growth and storage branches behave differently. Storage branches can be opened by a clash.
• A stem is rooted when a branch hides the same element. Roots in the month and day branches count most.
• A hidden stem that also appears as a visible stem is revealed and especially influential.
• Ten Gods are assigned by hidden stem, not by the branch's own polarity.
• Luck and annual branches activate natal branches through clashes and combinations.

Reading a branch fully means looking at its main, middle and residual qi, its growth stage and any groups it belongs to. That is how twelve symbols become a detailed picture.

Key terms in this article

Earthly Branches · 地支

The twelve earthly branches — 子丑寅卯辰巳午未申酉戌亥 — mark months, hours and directions. Each branch holds one to three hidden stems, so a branch is a container of elements rather than a single element. Branches combine, clash, harm and punish one another.

Hidden Stems · 藏干

Hidden stems (藏干 or 人元) are the stems stored inside each earthly branch: a main qi and up to two residual qi. For example 寅 holds 甲 (main), 丙 and 戊. Hidden stems provide roots for the Day Master and can be "revealed" when the same stem appears above.

Root · 通根

A stem is rooted when a branch in the chart contains the same element among its hidden stems. Roots in the month and day branches count most; a main-qi root is stronger than a residual one. An unrooted Day Master is easily swayed by surrounding elements.

Three Harmony · 三合

Three-harmony frames join three branches four positions apart into one element: 申子辰 water, 亥卯未 wood, 寅午戌 fire, 巳酉丑 metal. The middle branch is the core; two of the three form a half-combination.

Common questions

Why does my element count differ when hidden stems are included? Because each branch contributes up to three elements. This calculator shows the visible count separately and lists hidden stems.

Are all hidden stems equally strong? No — main qi first, then middle, then residual.

Can a branch's hidden stem be its Day Master root even if it is residual? Yes, but it is a weak root.

Next: combinations and clashes.