How to Use the 12 Growth Phases in Bazi: Day Master and Ten Gods

一 What it is

Think of a weather station that records temperature, wind, and rainfall. Each reading describes one condition at one moment. None of them, alone, tells you what your day will be like. The Twelve Growth Phases work the same way inside a Bazi chart: they are a lookup layer that describes a relationship between a stem and a branch, not a verdict about a person.

A phase is calculated for one specific stem against one specific branch. You can calculate a phase for the Day Master, the stem in the day pillar, or for any other stem that appears in the chart. Those are different questions with different answers, even when the branch is the same.

The boundary matters. A phase label does not independently establish strength. It does not determine a Ten God. It does not predict a life event. It is one descriptive coordinate among several, and it only becomes meaningful when you read it alongside the pillars, the visible stems, the hidden stems, and the element totals that the calculator already shows you.

So treat the phases as a reference table you consult, not a conclusion you announce. The label tells you where a stem sits in a cycle. What you do with that observation is a separate step, and it always depends on the rest of the chart.

二 Where to find it in your chart

Reading the Grid Before You Read Phases

In the calculator's "Your Four Pillars" section, the Day Master is the top character of the day column, with its branch below and hidden stems shown as small characters. "Element balance" gives weighted totals, while "Day Master strength" does show a weak, balanced, or strong verdict with score, season, support, drain, and climate need when present. There is no dedicated visible twelve-phase row, so copy the reference stem and target branch into this article's table.

Each phase needs its own reference stem. In Chart A, month stem Xin at Si is Death, while Jia at that same Si is Sickness. In Chart B, Ding at Hai is Conception, whereas Jia at Hai is Birth. Hidden Geng at Si uses the same matrix independently of weight; hidden weights 1, .5, and .3 are calculator conventions, not a universal strength scale. Do not transfer a Day Master row to another stem or assign one phase to an entire Ten God category.

Known birth time is recommended; with an unknown hour, treat any placeholder-derived score as incomplete. To calculate your chart, copy the reference stem, target branch, result, and column into the article table.

三 How to read it

How to Read a Phase Without Mixing Reference Stems

A Growth Phase lookup needs two coordinates: a reference stem and a target branch. The Ten God label comes from the relationship between the Day Master and the target stem, while the phase comes from the target stem moving through the chosen branch. Keep those two operations separate. If you ask about Jia at Si, Jia is the reference stem and Si is the target branch, giving Sickness. If you ask about Geng at the same Si, Geng is now the reference stem, giving Birth. Same branch, different stem, different phase.

Exact stems matter even inside one Ten God category. In Chart A, the month stem is Xin, a Direct Officer, and Xin at its own branch Si is Death. The Day Master Jia at that same Si is Sickness. In Chart B, the month stem is Ding, a Hurting Officer, and Ding at Hai is Conception, while Jia at Hai is Birth. Do not assign one phase to an entire generic Ten God category, and do not copy a Day Master row onto another stem.

Hidden stems use the same matrix independently. In Chart A, Si hides Geng, a Seven Killings, and Geng at Si is Birth regardless of its 0.5 weight. The weights 1, 0.5, and 0.3 are calculator conventions for ordering hidden stems, not a universal strength scale. A hidden stem's phase is read from that stem to its own branch, not from the Day Master and not from the visible stem above it.

Work through four common reference swaps. First, swap the reference stem: Jia at Si is Sickness, but Geng at Si is Birth. Second, compare visible with hidden: visible Xin at Si is Death, while hidden Geng at Si is Birth. Third, compare yang with yin: Geng at Si is Birth, but Xin at Si is Death, although both are Metal. Fourth, when the hour is unknown, read only the known pillars and leave the missing column blank rather than guessing a stem or branch.

Write each result as a compact formula: reference stem, target branch, phase, column. For example, Jia to Si gives Sickness in the month column of Chart A; Ding to Hai gives Conception in the month column of Chart B. This format keeps the reference visible and prevents a phase from drifting onto the wrong stem.

One limitation: a phase label describes a stem-branch relationship, not a personality trait, event, or health outcome. For the full definition and lookup reference, see Twelve Growth Phases. Repeat the same formula for every stem you choose, then compare the recorded labels across columns.

四 When the reading changes

These four scenarios show how the same lookup layer behaves under different observable conditions. Each one names what to check and what you can reasonably conclude.

Reference swap: Jia at Si versus Geng at Si

Observable condition: the same branch, Si, is read against two different reference stems.

Concrete check: in Chart A, take the month branch Si. Against the Day Master Jia, the phase is Sickness. Against Geng, the Seven Killings stem hidden in that branch, the phase is Birth. Formula: reference stem Geng, target branch Si, result Birth, month hidden-stem position. The visible month stem is Xin.

Explanation: the phase belongs to the stem-branch pair, not to the branch alone. Jia and Geng sit at different points of their own cycles even when the branch is identical. Do not transfer the Day Master row to another stem.

Visible stem versus hidden stem at the same branch

Observable condition: Si hides Geng, and you want its phase independently of the visible month stem.

Concrete check: read the hidden list at Si: Bing weight 1, Geng weight 0.5, Wu weight 0.3. Look up Geng against Si and record Birth. Formula: reference stem Geng, target branch Si, result Birth, hidden position two.

Explanation: hidden stems use the same matrix as visible stems. The weights 1, 0.5, and 0.3 are calculator conventions for counting, not a universal strength scale, so they do not change the phase label.

Yang versus yin officer stems at Si

Observable condition: both Geng and Xin are Metal and both relate to Jia as officer types, yet their phases at Si differ.

Concrete check: in Chart A, month stem Xin is Direct Officer. Against its own branch Si, Xin is Death. Geng at the same Si is Birth. Formula: reference stem Xin, target branch Si, result Death, month column.

Explanation: exact stems matter. Yang and yin stems travel their cycles in opposite directions, so a shared element or shared Ten God category does not produce one shared phase. Never assign one phase to an entire generic category.

Unknown hour and the Ding at Hai comparison

Observable condition: the hour is uncertain, so only confirmed columns should be read.

Concrete check: in Chart B, month stem Ding is Hurting Officer. Against Hai, Ding is Conception, while Jia at the same Hai is Birth. Formula: reference stem Ding, target branch Hai, result Conception, month column. If the hour is unknown, exclude hour-column phases from your notes.

Explanation: Ding and Jia again show that the reference stem decides the result. An unknown hour removes one column of evidence but does not alter the confirmed month pairings. To connect a stem to its relationship with the Day Master, read that layer separately under Ten Gods.

五 Worked chart examples

Both calendar-screened teaching charts use Jia Wood as the Day Master. They illustrate contrasting placements and do not represent client histories.

Reading Chart A: One Branch, Several Different Phase Questions

Chart A has four pillars: 庚午 in the year, 辛巳 in the month, 甲戌 in the day, and 己巳 in the hour. The Day Master is 甲, sitting in the day column on the branch 戌.

The month branch 巳 is a useful teaching case because several stems meet the same branch and receive different Twelve Growth Phases. The phase depends on the reference stem, not on the branch alone. For 甲 at 巳, the result is Sickness. For 辛, the month stem, 辛 at 巳 is Death. These are separate lookups even though both 辛 and 庚 belong to the Metal Ten Gods family.

Hidden stems follow the same matrix independently. The month branch 巳 hides 丙, 庚, and 戊. Hidden 庚 at 巳 is Birth, read on its own row rather than borrowed from the visible 辛 row. The calculator's hidden weights 1, 0.5, and 0.3 are conventions for counting presence, not a universal strength scale.

To work a phase by hand, name the reference stem, name the target branch, then read the result at their intersection. For example: reference stem 甲, target branch 巳, result Sickness, month column. Reference stem 辛, target branch 巳, result Death, month column. Reference stem 庚, target branch 巳, result Birth, hidden row.

One limitation: a phase describes a stem-branch relationship, not a personality or an event. Keep the reference stem and column attached to every result.

Chart B: Same Day Master, Different Branches

Chart B shares Chart A's year pillar 庚午 and hour pillar 己巳, but its month and day pillars differ: 丁亥 and 甲申. The Day Master remains 甲 Wood. Because the month and day branches change, the phase lookups change too, even where the same stem appears.

Month Column: Ding at Hai Versus Jia at Hai

In Chart A, month stem 辛 (Direct Officer) sits on 巳, giving Death; 甲 on that same 巳 gives Sickness. In Chart B, month stem 丁 (Hurting Officer) sits on 亥, giving Conception, while 甲 on 亥 gives Birth. The phase follows the target stem against the chosen branch, not the Ten God category. Both 辛 and 庚 are Metal officers, yet 庚 at 巳 gives Birth while 辛 at 巳 gives Death, so exact stems matter.

Hidden Stems and the Same Matrix

Hidden stems use the same matrix independently of weight. Hidden 庚 inside 巳 is read as 庚 at 巳, regardless of its 0.5 convention weight. The same applies to hidden 甲 in 亥. The phase result belongs to that specific stem-branch pair, not to the whole pillar or the printed Ten God label.

A Practical Reader Check

Pick one visible stem and one branch, name the Ten God from the Day Master's relationship to that stem, then name the phase from that stem to the branch. Keep the two lookups separate. A useful cross-check: compare a yang stem and its yin counterpart at the same branch, as 庚 and 辛 at 巳 show. If the hour is unknown, work only with the three known pillars and leave the fourth lookup blank rather than guessing. For stem-level background, see Heavenly Stems.

六 What this comparison can tell you

The lookup used here advances for Yang stems, reverses for Yin stems and places Earth with Fire. Each of its ten stem rows assigns one phase to each of twelve branches. Birth therefore occupies ten of the 120 stem–branch lookup cells. That is a property of the lookup table, not a birth-population rate or the proportion of whole charts containing Birth. Translations of the phase names vary, so keep the Chinese name and reference stem in your notes.