Accuracy cluster · Four Pillars
BaZi Calculation Accuracy
BaZi accuracy lives at the boundaries. This cluster shows the inputs and conventions that can change a chart, then publishes the test cases needed to review them.
07
Original guides with sources, tests, and declared limits
How to use this cluster
Follow the first disputed input.
Normalize
Confirm the date, place, time zone, and precision.
Calculate
Inspect positions, boundaries, houses, or pillars.
Interpret
Keep symbolic meaning conditional and separate.
Research path
Seven questions, one audit trail.
How True Solar Time Is Calculated for BaZi
See how longitude, the local standard meridian, and the equation of time turn civil birth time into a reviewable true-solar-time correction for BaZi.
8 min →02Does Birthplace Change a BaZi Chart?
Learn when birthplace coordinates, historical time zones, daylight saving, and true solar time can change a BaZi Hour Pillar or date boundary.
7 min →03BaZi Calculator Accuracy: The Boundary Tests That Matter
A practical accuracy checklist for BaZi calculators covering true solar time, day rollover, solar terms, missing birth time, and reproducible outputs.
9 min →04Li Chun vs Chinese New Year in BaZi
Understand why the Start of Spring and Lunar New Year are different dates, how BaZi uses solar-term boundaries, and what to inspect in early-February charts.
8 min →05Historical Time Zones and Daylight Saving in BaZi
Why a current UTC offset is not enough for an old birth record, how daylight-saving transitions create edge cases, and what a BaZi calculator should disclose.
8 min →06Why BaZi Calculators Disagree
Five calculation choices that commonly produce different Four Pillars results: location, civil time, solar time, calendar boundaries, and missing-time handling.
8 min →07AstroZen BaZi Calculation Rules and Limits
A concise technical reference for AstroZen's Four Pillars inputs, time normalization, solar-term rules, element weighting, unknown-time behavior, and limitations.
9 min →From method to your chart
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