Civil-date reference · 2021-12-21
December 21, 2021 BaZi Chart
Tuesday, December 21, 2021 maps to a reference three-pillar record of 辛丑 · 庚子 · 癸卯. The hour pillar remains unresolved until birth time and place are supplied.
Answer first: the reference Day Master for 2021-12-21 is Gui · Yin Water, and the day pillar is Yin Water Rabbit (癸卯). This is a date record, not a complete personal reading.
Deterministic record
2021-12-21 at a glance
| Gregorian date | Tuesday, December 21, 2021 |
|---|---|
| Lunar date | 农历辛丑年十一月十八 · lunar month 十一月, day 十八 |
| Reference pillars | 辛丑 · 庚子 · 癸卯 (year · month · day) |
| Day Master | Gui · Yin Water · heavenly stem 癸 |
| Solar-term position | Day 1 of Winter Solstice (冬至), beginning 2021-12-21 |
| Next solar term | Minor Cold (小寒) · 2022-01-05 · 15 days away |
| Western constellation | Sagittarius (射手) |
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 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 →
Yin Water Rabbit · Gui Mao
The visible stem is Gui · Yin Water; the branch is Mao · Rabbit · Wood. Its Na Yin is 金箔金, and the branch contains hidden stem 乙. 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 December 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 2021-12-21
What is the BaZi day pillar for Tuesday, December 21, 2021?
In this civil-date reference, the day pillar is 癸卯 (Yin Water Rabbit), cycle position 40 of 60. A personal chart must still resolve the birthplace, local clock time, and day boundary.
What is the Day Master for Tuesday, December 21, 2021?
The reference Day Master is 癸, Gui · Yin 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 2021-12-21 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 2021-12-21?
2021-12-21 is day 1 of Winter Solstice (冬至) in this date reference. The next solar term is Minor Cold (小寒) on 2022-01-05.