Hour Pillar in Bazi (時柱)
Learn how two-hour branches and the Five Rats rule form the Hour Pillar, what the hour position can represent, and how to handle uncertain birth times.
Overview
The Hour Pillar is the stem-branch pair assigned to the effective birth time. The branch comes from one of twelve double-hour intervals, and the stem is derived from the resolved Day Stem through the Five Rats sequence. Classical readings often associate the hour position with later development, children, outcomes, or what comes to fruition, but an unknown or boundary-adjacent birth time must remain uncertain rather than being guessed.
At a glance
- Components
- Hour Stem and Hour Branch
- Branch interval
- One of twelve double hours
- Stem rule
- Five Rats from the Day Stem
- Classical image
- Flower and fruit or later outcome
- Input risk
- Recorded time and boundary precision
- Limit
- Unknown time must not be invented
Resolve the effective local time before selecting a branch
Historical time-zone rules, daylight saving, and any declared solar-time adjustment can move a clock reading into another double hour. Use the birthplace rather than the reader’s current zone.
At a branch boundary, retain the supported time range. Produce separate candidate charts only if the range actually changes a pillar.
- Preserve civil and effective times.
- Do not round an uncertain record into certainty.
Derive the Hour Stem from the Day Stem
Five Rats maps each Day Stem group to the Zi-hour starting stem and advances one stem per hour branch. The same clock interval therefore receives different Hour Stems on different Day Stems.
If the day-boundary policy changes the Day Pillar, recalculate the Hour Stem from the new Day Stem. A standalone hour lookup table is incomplete.
- Validate Day Stem to Hour Stem dependency.
- Recompute after any effective-date change.
Use later-life and child analogies cautiously
Yuan Hai Zi Ping calls the hour flower and fruit and connects it with descendants. Other methods extend the position to aspirations, output, later development, or final expression.
These domains are interpretive lenses, not proof of fertility, child count, old-age fortune, or accomplishments. The actual symbols and whole chart remain primary.
- Label the positional tradition used.
- Avoid medical or family-status claims.
An absent birth time creates scenarios, not a default pillar
When the time is unknown, stable Year, Month, and Day information can still be shown, but the Hour Pillar and every downstream result that depends on it must be marked unresolved.
Rectification may compare candidates against dated evidence under an explicit method. It cannot convert a vague memory or personality fit into a verified minute.
- Show which results remain stable.
- Keep candidate selection auditable and reversible.
Sources and editorial basis
- 《淵海子平》 (Yuanhai Ziping)「看命入式」以時為果，將時柱置於年、月、日之後作為四柱末位語境A foundational Ziping reference for branch months, hidden stems, roots, and stem-branch relationships.
- 《三命通會》 (Sanming Tonghui)卷二比較日時干支與日主、月令的關係，時柱須由同一命式全局共同判讀A historical compilation covering stems and branches, Ten Gods, Nayin, Shen Sha, and multiple classical pattern systems.
- OpenFate Editorial Methodology時柱的時支、五鼠遁時干與傳統晚景或子女象意分層，不把宮位轉譯成結果保證OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.