What Are the Four Pillars in Bazi? A Beginner’s Guide to Year, Month, Day and Hour

一 What it is

Where the Four Pillars Sit in a Chart

When you open the calculator at bazi-calculator.org, the result appears as columns, not unrelated symbols. The usual order runs left to right: Year, Month, Day, Hour. Each column places a Heavenly Stem above an Earthly Branch. This vertical pairing is why the chart is called a pillar: stem and branch stand together as one unit. For the underlying framework, see How to Read a Bazi Chart: A Step-by-Step Guide for Beginners.

The Year Pillar sits at the outer edge. Traditionally it is associated with the wider calendar and social frame—the broad setting rather than a private trait. The Month Pillar comes next and is traditionally associated with the seasonal branch and context. Season matters because Bazi uses a calendar of stems and branches, not only familiar solar months. The Month Pillar helps show which seasonal conditions surround the chart.

The Day Pillar is central for beginners because it contains the Day Master, the Heavenly Stem of the Day Pillar. In many study methods, the rest of the chart is observed in relation to that stem. The Day Branch sits below it and is traditionally associated with the immediate environment of the day position. The Hour Pillar is the birth-time-dependent column. It depends on an accurate time and place, which is why true solar time is used for Day and Hour in this calculator.

Hidden stems sit inside the branches. A branch may contain one, two or three hidden stems. These are not visible as large characters in the column, but they belong to the branch’s internal structure. A beginner should notice both layers: the visible stem and branch, and the hidden stems within the branch. The calculator may also display hidden-stem weights using the convention 1.0, 0.5 and 0.3 in list order. Those weights belong to its displayed convention. They are not an overall strong or weak verdict, and raw element counts should not be treated as one either.

Placement gives each pillar a different job. The Year is not the Month, and the Hour is not the Day. Reading them in position helps you avoid treating every character as if it means the same thing wherever it appears.

二 Where to find it in your chart

How to Observe the Four Pillars in a Repeatable Order

A repeatable sequence keeps a beginner from jumping to conclusions. Use the same steps each time, and describe only what the chart shows before interpreting anything.

• Step 1: Confirm the calendar basis. Check that Year and Month follow China time and that Day and Hour use true solar time. If the birth time is unknown, confirm no hour column has been invented. This protects the chart’s structure before you read a single symbol.
• Step 2: Name the four positions. Say the columns in order: Year, Month, Day, Hour. For each, identify the Heavenly Stem above and the Earthly Branch below. Do not skip labels, because position is part of the information.
• Step 3: Locate the Day Master. Find the Heavenly Stem of the Day Pillar. This is the reference point many methods use when observing other stems, branches and hidden stems. Naming it clearly prevents the chart from becoming a blur.
• Step 4: List the visible stems. Read the four Heavenly Stems from Year to Hour. Note whether a stem appears more than once. Repetition is observable, not automatically a verdict about strength or character.
• Step 5: List the visible branches. Read the four Earthly Branches from Year to Hour. Note the Month Branch’s seasonal position especially, because the Month Pillar is traditionally associated with seasonal context.
• Step 6: Open the hidden stems. For each branch, list its hidden stems in the order shown. Then note any hidden gods the calculator displays beside them. Hidden information often changes how a column looks at first glance.
• Step 7: Note displayed weights separately. If the calculator shows hidden-stem weights of 1.0, 0.5 and 0.3 in list order, record them as its displayed convention. Do not turn those weights or raw element counts into an overall strong or weak verdict.
• Step 8: Compare positions, not isolated symbols. Ask how Year, Month, Day and Hour differ in role. Year gives a wider calendar and social frame; Month gives seasonal branch and context; Day gives the Day Master and Day Branch; Hour gives the birth-time-dependent column.
• Step 9: Summarize only what is visible and hidden. Write one sentence for the visible layer and one for the hidden layer. Keep traditional associations labeled as traditional symbolic associations, not predictions, diagnoses, promises, relationship claims, career claims or personality verdicts.

This sequence is deliberately plain. It requires no new calculation. It asks you to observe the chart in the same order each time so later study has a stable foundation. When you can describe the four positions, visible stems and branches, hidden stems and displayed convention without mixing them together, you are ready to compare charts.

三 How to read it

Variations to Watch For in Four-Pillar Observation

Four Pillars can look similar at a glance while differing in important observable ways. The following scenarios describe conditions you can check directly in a chart. Each ends with a concrete check so you can confirm what you are seeing. The method is easier to compare with Hour Pillar in Bazi: What Birth Time Changes in Your Chart.

Scenario 1: The Month Branch Changes the Seasonal Context

Two charts may share the same Day Master and even the same Year Stem, yet their Month Branches place them in different seasonal contexts. Because the Month Pillar is traditionally associated with the seasonal branch and context, the Month Branch deserves careful attention. A beginner who reads only the Day Master may miss how the surrounding columns differ.

In the first teaching chart supplied here, the pillars are 庚申, 戊寅, 甲子 and 乙丑. The Month Pillar is 戊寅. Its visible stem is 戊, and its visible branch is 寅. The hidden stems in 寅 are listed as 甲, 丙 and 戊, with hidden gods Friend, Eating God and Indirect Wealth. The Day Master is 甲, the stem of the Day Pillar 甲子. The Day Branch 子 has one hidden stem, 癸, with hidden god Direct Resource.

In the second teaching chart, the pillars are 庚申, 乙酉, 甲午 and 乙丑. The Month Pillar is 乙酉. Its visible stem is 乙, and its visible branch is 酉. The hidden stem in 酉 is 辛, with hidden god Direct Officer. The Day Master is again 甲, but the Day Pillar is 甲午. The Day Branch 午 has hidden stems 丁 and 己, with hidden gods Hurting Officer and Direct Wealth.

Concrete check: Compare the Month Branch in each chart, then list its hidden stems and hidden gods. In the first chart the Month Branch is 寅; in the second it is 酉. The visible Month Stem also differs: 戊 in the first, 乙 in the second. This check shows how seasonal context and visible stem change even when the Day Master stays the same.

Scenario 2: The Day Branch Differs While the Day Master Stays the Same

The Day Pillar contains both the Day Master and the Day Branch. Beginners sometimes focus on the Day Master and forget the branch below it. The Day Branch is part of the same pillar, and its hidden stems may add information not visible in the large characters.

In the first teaching chart, the Day Pillar is 甲子. The visible stem is 甲, and the visible branch is 子. The hidden stem in 子 is 癸, with hidden god Direct Resource. In the second teaching chart, the Day Pillar is 甲午. The visible stem is still 甲, but the visible branch is 午. The hidden stems in 午 are 丁 and 己, with hidden gods Hurting Officer and Direct Wealth.

The visible Day Stem is identical in both charts, yet the Day Branch is not. One branch has a single hidden stem; the other has two. The hidden gods also differ. This is a clear example of why the visible layer and the hidden layer should be described separately.

Concrete check: Write the Day Pillar as a pair, then list the hidden stems below the branch. For the first chart, write 甲子 and list 癸. For the second, write 甲午 and list 丁 and 己. Confirm that the Day Master is 甲 in both before comparing the branches.

Scenario 3: The Hour Pillar Is Present, Absent or Different

The Hour Pillar is the birth-time-dependent column. It depends on an accurate birth time and place, and Day and Hour use true solar time in this calculator. If the time is unknown, no hour column should be invented. This creates an observable variation: a chart may have a complete Hour Pillar, or it may lack that column entirely.

Both teaching charts supplied here include an Hour Pillar of 乙丑. Its visible stem is 乙, and its visible branch is 丑. The hidden stems in 丑 are 己, 癸 and 辛, with hidden gods Direct Wealth, Direct Resource and Direct Officer. Even though the Hour Pillar is the same in both examples, its position remains distinct from the Year, Month and Day. It should not be read as a copy of another column.

If a birth time were unknown, the correct observation would be different: the chart would show no hour column, and no Hour Stem or Hour Branch should be supplied by guesswork. A beginner should treat that absence as part of the chart’s condition, not as a gap to fill with imagination.

Concrete check: Confirm whether an Hour Pillar exists. If it does, name its visible stem and branch, then list its hidden stems. If it does not, state that the hour column is absent because the time is unknown. Do not invent a stem or branch to complete the pattern.

Scenario 4: The Same Hidden God Appears in Different Positions

Hidden gods can repeat across a chart. Repetition is observable, but it should not be converted into a verdict about strength, character or future events. The same hidden god may appear in the Year, Month, Day or Hour, and each position has a different role in the structure.

In the first teaching chart, Indirect Wealth appears as a hidden god in the Year Branch 申 and again in the Month Branch 寅. The Year Pillar is 庚申, with hidden stems 庚, 壬 and 戊 and hidden gods Seven Killings, Indirect Resource and Indirect Wealth. The Month Pillar is 戊寅, with hidden stems 甲, 丙 and 戊 and hidden gods Friend, Eating God and Indirect Wealth. The same hidden god therefore appears in two different positions.

In the second teaching chart, Direct Officer appears in the Month Branch 酉 and again in the Hour Branch 丑. The Month Pillar is 乙酉, with hidden stem 辛 and hidden god Direct Officer. The Hour Pillar is 乙丑, with hidden stems 己, 癸 and 辛 and hidden gods Direct Wealth, Direct Resource and Direct Officer. Again, the same hidden god appears in more than one column.

Concrete check: Make a simple list of hidden gods by position. Mark every repeat, then note which position each occurrence belongs to. Do not add the displayed weights into a single score, and do not treat raw element counts as an overall strong or weak verdict. The check is about location and repetition, not about declaring an outcome.

四 Different scenarios

Example A: Reading the First Teaching Chart in Order

The first teaching chart has the pillars 庚申, 戊寅, 甲子 and 乙丑. Read from left to right, the positions are Year, Month, Day and Hour. The Year Pillar is 庚申. Its visible Heavenly Stem is 庚, and its visible Earthly Branch is 申. The hidden stems in 申 are 庚, 壬 and 戊, with hidden gods Seven Killings, Indirect Resource and Indirect Wealth. The Year Pillar is traditionally associated with a wider calendar and social frame, so this column is observed as the outer setting of the chart. This point connects directly with Year Pillar in Bazi: How to Read the First Column of Your Four Pillars.

The Month Pillar is 戊寅. Its visible stem is 戊, and its visible branch is 寅. The hidden stems in 寅 are 甲, 丙 and 戊, with hidden gods Friend, Eating God and Indirect Wealth. The Month Pillar is traditionally associated with the seasonal branch and context. Here the visible Month Stem and the hidden stems inside 寅 both belong to the column, but they are not the same layer. The visible characters are 戊 and 寅; the hidden information is 甲, 丙 and 戊.

The Day Pillar is 甲子. Its visible stem is 甲, which is the Day Master, and its visible branch is 子. The hidden stem in 子 is 癸, with hidden god Direct Resource. The Day Pillar contains both the Day Master and the Day Branch, so a beginner should name both rather than treating 甲 as the whole column. The Hour Pillar is 乙丑. Its visible stem is 乙, and its visible branch is 丑. The hidden stems in 丑 are 己, 癸 and 辛, with hidden gods Direct Wealth, Direct Resource and Direct Officer. The Hour Pillar is the birth-time-dependent column, so it depends on an accurate time and place.

When the calculator displays hidden-stem weights of 1.0, 0.5 and 0.3 in list order, those numbers belong to its displayed convention. They are not an overall strong or weak verdict. The same applies to raw element counts. For this chart, the useful beginner exercise is to separate the visible layer from the hidden layer and to keep each observation tied to its position. The Year gives a wider frame, the Month gives seasonal context, the Day gives the Day Master and Day Branch, and the Hour gives the birth-time-dependent column. Traditional associations such as these are symbolic, not predictions or personal verdicts.

Example B: Reading the Second Teaching Chart in Order

The second teaching chart has the pillars 庚申, 乙酉, 甲午 and 乙丑. The Year Pillar is 庚申, exactly as in the first chart. Its visible stem is 庚, its visible branch is 申, and its hidden stems are 庚, 壬 and 戊, with hidden gods Seven Killings, Indirect Resource and Indirect Wealth. Because the Year Pillar is traditionally associated with a wider calendar and social frame, it is observed first as the broader setting.

The Month Pillar is 乙酉. Its visible stem is 乙, and its visible branch is 酉. The hidden stem in 酉 is 辛, with hidden god Direct Officer. This is a useful contrast with the first chart, where the Month Pillar was 戊寅 and the Month Branch 寅 held three hidden stems. Here the Month Branch 酉 holds one hidden stem. The Month Pillar is traditionally associated with the seasonal branch and context, so the change in branch is an important observable difference.

The Day Pillar is 甲午. Its visible stem is 甲, the Day Master, and its visible branch is 午. The hidden stems in 午 are 丁 and 己, with hidden gods Hurting Officer and Direct Wealth. The Day Master is the same as in the first chart, but the Day Branch is different: 子 in the first chart, 午 in the second. The Hour Pillar is 乙丑. Its visible stem is 乙, and its visible branch is 丑. The hidden stems in 丑 are 己, 癸 and 辛, with hidden gods Direct Wealth, Direct Resource and Direct Officer.

As with the first chart, the displayed hidden-stem weights of 1.0, 0.5 and 0.3 in list order are part of the calculator’s convention. They are not an overall strong or weak verdict, and raw element counts should not be treated as one. The second chart shows why position and layer matter. The Year Pillar is the same as in the first chart, but the Month, Day and Hour columns differ in visible stems, visible branches or hidden stems. A beginner can describe those differences without recalculating totals or inventing a life story. The traditional associations attached to Year, Month, Day and Hour remain symbolic labels for study, not promises, diagnoses or fixed claims about a person.

五 Worked chart examples

These are calendar-engine-screened teaching examples, not client charts or claims about life events. Tables are produced from the calculator’s data rules.

Learning the Four Pillars is mainly a lesson in careful observation. A Bazi chart is not a pile of isolated symbols. It is four positions, each with a visible Heavenly Stem above an Earthly Branch, and each branch carrying hidden stems that may add further information. The Year Pillar gives a wider calendar and social frame. The Month Pillar gives the seasonal branch and context. The Day Pillar contains the Day Master and the Day Branch. The Hour Pillar is the birth-time-dependent column.

The calendar rules are part of the structure. Year and Month follow China time; Day and Hour use true solar time. If the birth time is unknown, no hour column should be invented. When the calculator shows hidden-stem weights of 1.0, 0.5 and 0.3 in list order, those weights belong to its displayed convention. They are not an overall strong or weak verdict, and raw element counts are not one either.

Beginners can practice by naming the four positions, listing the visible stems and branches, opening the hidden stems, and noting the displayed convention separately. The two teaching charts in this guide show how the same Day Master can sit with different Month and Day Branches, and how the same hidden god can appear in more than one position. Those are observable features, not predictions. Traditional associations should always be identified as traditional symbolic associations, never as diagnoses, promises, relationship claims, career claims or personality verdicts.

Read the columns together, keep each observation tied to its position, and let the chart’s structure guide the study. That habit will serve you better than memorizing isolated meanings.

This section explains how the Day Master is assessed within a chart. The Day Master represents the self in Bazi, and its strength is judged by support from the month, other stems, branches, and the overall balance of the chart. A Day Master may be described as strong, weak, balanced, or otherwise influenced by the surrounding elements. These labels are not moral judgments; they are technical descriptions used to guide further analysis.

Interpretation should remain cautious. A strong Day Master does not automatically mean good fortune, and a weak one does not automatically mean difficulty. The useful Element and favorable influences depend on the whole chart, not on one factor alone. Beginners should avoid drawing firm conclusions from a single indicator.

Strong Day Master

A strong Day Master receives considerable support from the month or other parts of the chart. This may suggest a need for elements that balance or drain that strength, depending on the full configuration.

Weak Day Master

A weak Day Master has limited support. It may benefit from reinforcing elements, but this still depends on the broader structure and seasonal context.

Balanced Day Master

A balanced Day Master is neither strongly supported nor strongly depleted. Balance can be useful, though it does not by itself determine outcomes.

Other Variations

Some charts show mixed or unclear strength. In such cases, the analyst should consider Season, Root, Stem, and Branch relationships before making any judgment.

六 Base rate in the combination space

Every one of the 518,400 possible Four Pillars combinations contains all four columns by definition. This is a structural fact of the four-column layout, not a population statistic.

The combination space uses 60 year pillars × 12 solar-month slots × 60 day pillars × 12 hour slots. It does not say what percentage of people have a trait, event, occupation or outcome. Reading the column well depends on its exact stem, branch, hidden stems, calendar boundary and the rest of the chart.