Case 06 of 26
Solar-term boundaries
After Qingming: the Chen month begins
The paired April case advances to the next solar month.
Boundary question
What does the same engine return after Qingming?
The Month Pillar advances from Xin-Mao (辛卯) to Ren-Chen (壬辰).
Synthetic input
Recorded facts
- Date
- 2026-04-06
- Recorded time
- 12:00
- Location
- 120°E reference meridian
- Time zone
- Asia/Shanghai
- Longitude
- 120.0000°
- Gender input
- Female
Pinned expected facts
Verified output
Year
丙午
Month
壬辰
Day
庚戌
Hour
壬午
- Day Master
- 庚
- True solar time
- 2026-04-06 11:57
- Total correction
- -2.82 minutes
- Historical offset
- UTC+08:00 · DST 0 min
- Luck direction
- 逆排
- Reference Jie
- 清明 · 2026-04-05 02:40:00
- Luck start
- 2026-09-22 22:17:10
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