Civil-date reference · 1921-09-21
September 21, 1921 BaZi Chart
Wednesday, September 21, 1921 maps to a reference three-pillar record of 辛酉 · 丁酉 · 丁亥. The hour pillar remains unresolved until birth time and place are supplied.
Answer first: the reference Day Master for 1921-09-21 is Ding · Yin Fire, and the day pillar is Yin Fire Pig (丁亥). This is a date record, not a complete personal reading.
Deterministic record
1921-09-21 at a glance
| Gregorian date | Wednesday, September 21, 1921 |
|---|---|
| Lunar date | 农历辛酉年八月二十 · lunar month 八月, day 二十 |
| Reference pillars | 辛酉 · 丁酉 · 丁亥 (year · month · day) |
| Day Master | Ding · Yin Fire · heavenly stem 丁 |
| Solar-term position | Day 14 of White Dew (白露), beginning 1921-09-08 |
| Next solar term | Autumn Equinox (秋分) · 1921-09-23 · 2 days away |
| Western constellation | Virgo (处女) |
Three coordinates, three jobs
What the reference pillars contain
Each stem-branch pair is a deterministic calendar coordinate. Its role changes by pillar position, so the three rows stay separate rather than collapsing into one personality label.
Yin Metal Rooster · Xin You
The visible stem is Xin · Yin Metal; the branch is You · Rooster · Metal. Its Na Yin is 石榴木, and the branch contains hidden stem 辛. Open the full Jiazi record →
Yin Fire Rooster · Ding You
The visible stem is Ding · Yin Fire; the branch is You · Rooster · Metal. Its Na Yin is 山下火, and the branch contains hidden stem 辛. Open the full Jiazi record →
Yin Fire Pig · Ding Hai
The visible stem is Ding · Yin Fire; the branch is Hai · Pig · Water. Its Na Yin is 屋上土, and the branch contains hidden stems 壬 · 甲. Open the full Jiazi record →
Calculation boundary
What this date does not settle
The atlas uses a standard civil-date reference so dates can be compared consistently. A real birth happened at a place and an instant, not inside a URL slug.
- Hour pillar: requires birth time after historical timezone and true-solar-time correction.
- Day boundary: a late-night clock time can cross the adopted Zi-hour or solar-day boundary after correction.
- Solar-term boundary: an actual birth instant near a term transition can change the resolved year or month pillar.
- Interpretation: one date or one Jiazi pair does not determine career, relationships, wealth, health, or events.
Every date in September 1921
Resolve the fourth pillar
Calculate the actual birth chart
Add birth time and birthplace. Pillarwise then resolves historical timezone, longitude correction, equation of time, day-boundary risk, and the hour pillar before it generates a chart.
Questions about 1921-09-21
What is the BaZi day pillar for Wednesday, September 21, 1921?
In this civil-date reference, the day pillar is 丁亥 (Yin Fire Pig), cycle position 24 of 60. A personal chart must still resolve the birthplace, local clock time, and day boundary.
What is the Day Master for Wednesday, September 21, 1921?
The reference Day Master is 丁, Ding · Yin Fire. The Day Master is the heavenly stem of the resolved day pillar; it is not a complete personality result.
Can I calculate a complete BaZi chart from 1921-09-21 alone?
No. A complete Four Pillars chart requires birth time and birthplace. Historical timezone, longitude correction, equation of time, and hour or day boundaries can materially change the resolved chart.
Which solar term contains 1921-09-21?
1921-09-21 is day 14 of White Dew (白露) in this date reference. The next solar term is Autumn Equinox (秋分) on 1921-09-23.