Civil-date reference · 2010-12-21
December 21, 2010 BaZi Chart
Tuesday, December 21, 2010 maps to a reference three-pillar record of 庚寅 · 戊子 · 乙巳. The hour pillar remains unresolved until birth time and place are supplied.
Answer first: the reference Day Master for 2010-12-21 is Yi · Yin Wood, and the day pillar is Yin Wood Snake (乙巳). This is a date record, not a complete personal reading.
Deterministic record
2010-12-21 at a glance
| Gregorian date | Tuesday, December 21, 2010 |
|---|---|
| Lunar date | 农历庚寅年十一月十六 · lunar month 十一月, day 十六 |
| Reference pillars | 庚寅 · 戊子 · 乙巳 (year · month · day) |
| Day Master | Yi · Yin Wood · heavenly stem 乙 |
| Solar-term position | Day 15 of Major Snow (大雪), beginning 2010-12-07 |
| Next solar term | Winter Solstice (冬至) · 2010-12-22 · 1 day 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.
Yang Metal Tiger · Geng Yin
The visible stem is Geng · Yang Metal; the branch is Yin · Tiger · Wood. Its Na Yin is 松柏木, and the branch contains hidden stems 甲 · 丙 · 戊. Open the full Jiazi record →
Yang Earth Rat · Wu Zi
The visible stem is Wu · Yang Earth; the branch is Zi · Rat · Water. Its Na Yin is 霹雳火, and the branch contains hidden stem 癸. Open the full Jiazi record →
Yin Wood Snake · Yi Si
The visible stem is Yi · Yin Wood; the branch is Si · Snake · Fire. Its Na Yin is 覆灯火, and the branch contains hidden stems 丙 · 庚 · 戊. 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 2010
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 2010-12-21
What is the BaZi day pillar for Tuesday, December 21, 2010?
In this civil-date reference, the day pillar is 乙巳 (Yin Wood Snake), cycle position 42 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, 2010?
The reference Day Master is 乙, Yi · Yin Wood. 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 2010-12-21 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 2010-12-21?
2010-12-21 is day 15 of Major Snow (大雪) in this date reference. The next solar term is Winter Solstice (冬至) on 2010-12-22.