Case 04 of 26
Solar-term boundaries
After Jingzhe: the Mao month begins
The paired March case crosses the Jie and changes the Month Pillar.
Boundary question
Does the Month Pillar advance after Jingzhe?
Yes. The Month Pillar becomes Xin-Mao (辛卯), while the Year Pillar remains Bing-Wu (丙午).
Synthetic input
Recorded facts
- Date
- 2026-03-06
- Recorded time
- 12:00
- Location
- 120°E reference meridian
- Time zone
- Asia/Shanghai
- Longitude
- 120.0000°
- Gender input
- Male
Pinned expected facts
Verified output
Year
丙午
Month
辛卯
Day
己卯
Hour
庚午
- Day Master
- 己
- True solar time
- 2026-03-06 11:48
- Total correction
- -11.92 minutes
- Historical offset
- UTC+08:00 · DST 0 min
- Luck direction
- 顺排
- Reference Jie
- 清明 · 2026-04-05 02:40:00
- Luck start
- 2036-01-20 19:38:05
Conventions and limits
What this case does — and does not — prove
It verifies
Deterministic reproduction of this input under the named engine version and conventions. A pinned-field mismatch stops the production build.
It does not claim
Universal agreement across Bazi schools, interpretation of a real person, or certainty where the historical record is incomplete.
tyme4ts 1.5.2 · cantian-tymext 0.0.27 · sect 2 day boundary · BaziCalculator.ai NOAA/IANA true-solar adapter
calculation-benchmarks-v1 · reviewed 2026-09-05