Civil-date reference · 2021-10-31
October 31, 2021 BaZi Chart
Sunday, October 31, 2021 maps to a reference three-pillar record of 辛丑 · 戊戌 · 壬子. The hour pillar remains unresolved until birth time and place are supplied.
Answer first: the reference Day Master for 2021-10-31 is Ren · Yang Water, and the day pillar is Yang Water Rat (壬子). This is a date record, not a complete personal reading.
Deterministic record
2021-10-31 at a glance
| Gregorian date | Sunday, October 31, 2021 |
|---|---|
| Lunar date | 农历辛丑年九月廿六 · lunar month 九月, day 廿六 |
| Reference pillars | 辛丑 · 戊戌 · 壬子 (year · month · day) |
| Day Master | Ren · Yang Water · heavenly stem 壬 |
| Solar-term position | Day 9 of Frost Descent (霜降), beginning 2021-10-23 |
| Next solar term | Start of Winter (立冬) · 2021-11-07 · 7 days away |
| Western constellation | Scorpio (天蝎) |
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 Ox · Xin Chou
The visible stem is Xin · Yin Metal; the branch is Chou · Ox · Earth. Its Na Yin is 壁上土, and the branch contains hidden stems 己 · 癸 · 辛. Open the full Jiazi record →
Yang Earth Dog · Wu Xu
The visible stem is Wu · Yang Earth; the branch is Xu · Dog · Earth. Its Na Yin is 平地木, and the branch contains hidden stems 戊 · 辛 · 丁. Open the full Jiazi record →
Yang Water Rat · Ren Zi
The visible stem is Ren · Yang Water; the branch is Zi · Rat · Water. Its Na Yin is 桑柘木, 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 October 2021
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 2021-10-31
What is the BaZi day pillar for Sunday, October 31, 2021?
In this civil-date reference, the day pillar is 壬子 (Yang Water Rat), cycle position 49 of 60. A personal chart must still resolve the birthplace, local clock time, and day boundary.
What is the Day Master for Sunday, October 31, 2021?
The reference Day Master is 壬, Ren · Yang Water. 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 2021-10-31 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 2021-10-31?
2021-10-31 is day 9 of Frost Descent (霜降) in this date reference. The next solar term is Start of Winter (立冬) on 2021-11-07.