SAN MING TONG HUI

BaZi Four Pillars

Build a traditional Four Pillars chart from birth date, time, and place.

Rule-engine calculated chart and cycles4 capabilities

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BaZi Marriage Compatibility

Compare two Four Pillars charts for spouse stars, day-pillar relations, and element balance.

Birth dateTime precisionExact time: calculates the hour pillar, hour-stem ten gods, hidden-stem hour gods, Zi-hour day boundary, and true solar time correction.Approximate time: chart facts are calculated from the entered time but the report labels hour-pillar-dependent sections as approximate.Unknown time: hour pillar, hour-stem ten gods, hidden-stem hour gods, and true solar time correction are not calculated; report shows incomplete-information notices instead of dashes.Birth city required for true solar time correction, timezone conversion, and city-dependent rules. Without it these sections show incomplete-information notices.Birth timeGender for traditional luck-cycle rulesBirth city

Other person's birth detailsOther person's gender (for traditional spouse-star rules)Birth dateTime precisionBirth timeBirth cityExact or approximate times are accepted. Approximate times give an estimated start age; near a solar term, alternatives use an assumed one-hour window on either side, not a measured error range.

BaZi uses the selected birthplace timezone and true solar time, including longitude and equation-of-time correction. The 23:00 Zi-start day boundary is used. Unknown time omits the hour pillar and may make day-boundary-dependent results uncertain; approximate time is labeled as such. Gender is used only for traditional luck-cycle direction and gendered spouse-star conventions.

Some report sections will be marked partial or unavailable when required birth details are missing.

BaZi Four Pillars

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