Civil-date reference · 1987-10-18
October 18, 1987 BaZi Chart
Sunday, October 18, 1987 maps to a reference three-pillar record of 丁卯 · 庚戌 · 庚子. The hour pillar remains unresolved until birth time and place are supplied.
Answer first: the reference Day Master for 1987-10-18 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
1987-10-18 at a glance
| Gregorian date | Sunday, October 18, 1987 |
|---|---|
| Lunar date | 农历丁卯年八月廿六 · lunar month 八月, day 廿六 |
| Reference pillars | 丁卯 · 庚戌 · 庚子 (year · month · day) |
| Day Master | Geng · Yang Metal · heavenly stem 庚 |
| Solar-term position | Day 10 of Cold Dew (寒露), beginning 1987-10-09 |
| Next solar term | Frost Descent (霜降) · 1987-10-24 · 6 days away |
| Western constellation | Libra (天秤) |
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 Fire Rabbit · Ding Mao
The visible stem is Ding · Yin Fire; the branch is Mao · Rabbit · Wood. Its Na Yin is 炉中火, and the branch contains hidden stem 乙. Open the full Jiazi record →
Yang Metal Dog · Geng Xu
The visible stem is Geng · Yang Metal; the branch is Xu · Dog · Earth. Its Na Yin is 钗钏金, and the branch contains hidden stems 戊 · 辛 · 丁. 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 October 1987
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 1987-10-18
What is the BaZi day pillar for Sunday, October 18, 1987?
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 Sunday, October 18, 1987?
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 1987-10-18 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 1987-10-18?
1987-10-18 is day 10 of Cold Dew (寒露) in this date reference. The next solar term is Frost Descent (霜降) on 1987-10-24.