How Bazi Fate Stars Are Calculated (神煞計算)
Calculate Shen Sha by fixing a source table, identifying its reference stem or branch, scanning valid target positions, and recording exact matches.
Overview
Fate-Star calculation is a deterministic table lookup once the adopted source and rule version are fixed. The process identifies the required anchor—such as a Day Stem, Year Branch, or Day Branch—then scans only the permitted targets and records every exact match with its pillar and chart layer. Interpretation happens after calculation, not inside it.
At a glance
- Prerequisite
- Verified Four Pillars
- Rule identity
- Named source and table version
- Anchor
- Specified stem or branch
- Target
- Permitted branch or pillar positions
- Output
- Exact matches with provenance
- Separation
- Calculation before interpretation
Start from a stable natal chart
Confirm calendar boundaries, time zone, and the four natal pillars before any marker lookup.
A wrong Year, Month, Day, or Hour symbol can change both the reference anchor and every target match.
- Reuse the frozen chart result.
- Do not recalculate pillars inside the article layer.
Select one documented table
Record the text, edition, school, and exact row that defines the marker.
Do not merge alternate tables silently or choose whichever version produces the preferred result.
- Version the rule set.
- Preserve source disagreement.
Apply the declared anchor and target scope
Use only the stem or branch named by the rule and inspect only the positions the table permits.
Store the anchor, matching symbol, target pillar, natal or timed layer, and any duplicate matches as separate facts.
- Require exact symbol identity.
- Keep every match traceable.
Interpret only after the lookup is complete
Calculation establishes that a rule matched; it does not establish strength, usefulness, activation, or an event.
Attach structure, Ten-God, interaction, and timing evidence in a later interpretive step.
- Do not embed predictions in the calculator.
- Expose confidence and limits.
Sources and editorial basis
- 《御定星曆考原》卷一《御定星曆考原》神煞取法：先依歲干、歲支等規定基準，再查對應干支位置A historical source for stem and branch Yin-Yang, Five Phase, direction, seasonal, and calendrical correspondences.
- 《三命通會》 (Sanming Tonghui)《三命通會》卷三神煞逐條取法：每一標記須按其明示起例與目標符號核對A historical compilation covering stems and branches, Ten Gods, Nayin, Shen Sha, and multiple classical pattern systems.
- OpenFate Editorial Methodology神煞計算頁固定四柱、來源版本、基準、目標及柱位，計算與解讀分層且不在內容層重算命盤OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.