Civil-date reference · 2015-09-21
September 21, 2015 BaZi Chart
Monday, September 21, 2015 maps to a reference three-pillar record of 乙未 · 乙酉 · 庚子. The hour pillar remains unresolved until birth time and place are supplied.
Answer first: the reference Day Master for 2015-09-21 is Geng · Yang Metal, and the day pillar is Yang Metal Rat (庚子). This is a date record, not a complete personal reading.
Deterministic record
2015-09-21 at a glance
| Gregorian date | Monday, September 21, 2015 |
|---|---|
| Lunar date | 农历乙未年八月初九 · lunar month 八月, day 初九 |
| Reference pillars | 乙未 · 乙酉 · 庚子 (year · month · day) |
| Day Master | Geng · Yang Metal · heavenly stem 庚 |
| Solar-term position | Day 14 of White Dew (白露), beginning 2015-09-08 |
| Next solar term | Autumn Equinox (秋分) · 2015-09-23 · 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 Wood Goat · Yi Wei
The visible stem is Yi · Yin Wood; the branch is Wei · Goat · Earth. Its Na Yin is 沙中金, and the branch contains hidden stems 己 · 丁 · 乙. Open the full Jiazi record →
Yin Wood Rooster · Yi You
The visible stem is Yi · Yin Wood; the branch is You · Rooster · Metal. Its Na Yin is 泉中水, and the branch contains hidden stem 辛. Open the full Jiazi record →
Yang Metal Rat · Geng Zi
The visible stem is Geng · Yang Metal; the branch is Zi · Rat · Water. Its Na Yin is 壁上土, and the branch contains hidden stem 癸. 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 2015
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 2015-09-21
What is the BaZi day pillar for Monday, September 21, 2015?
In this civil-date reference, the day pillar is 庚子 (Yang Metal Rat), cycle position 37 of 60. A personal chart must still resolve the birthplace, local clock time, and day boundary.
What is the Day Master for Monday, September 21, 2015?
The reference Day Master is 庚, Geng · Yang Metal. 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 2015-09-21 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 2015-09-21?
2015-09-21 is day 14 of White Dew (白露) in this date reference. The next solar term is Autumn Equinox (秋分) on 2015-09-23.