Civil-date reference · 1991-05-13
May 13, 1991 BaZi Chart
Monday, May 13, 1991 maps to a reference three-pillar record of 辛未 · 癸巳 · 癸未. The hour pillar remains unresolved until birth time and place are supplied.
Answer first: the reference Day Master for 1991-05-13 is Gui · Yin Water, and the day pillar is Yin Water Goat (癸未). This is a date record, not a complete personal reading.
Deterministic record
1991-05-13 at a glance
| Gregorian date | Monday, May 13, 1991 |
|---|---|
| Lunar date | 农历辛未年三月廿九 · lunar month 三月, day 廿九 |
| Reference pillars | 辛未 · 癸巳 · 癸未 (year · month · day) |
| Day Master | Gui · Yin Water · heavenly stem 癸 |
| Solar-term position | Day 8 of Start of Summer (立夏), beginning 1991-05-06 |
| Next solar term | Grain Buds (小满) · 1991-05-21 · 8 days away |
| Western constellation | Taurus (金牛) |
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 Goat · Xin Wei
The visible stem is Xin · Yin Metal; the branch is Wei · Goat · Earth. Its Na Yin is 路旁土, and the branch contains hidden stems 己 · 丁 · 乙. Open the full Jiazi record →
Yin Water Snake · Gui Si
The visible stem is Gui · Yin Water; the branch is Si · Snake · Fire. Its Na Yin is 长流水, and the branch contains hidden stems 丙 · 庚 · 戊. Open the full Jiazi record →
Yin Water Goat · Gui Wei
The visible stem is Gui · Yin Water; the branch is Wei · Goat · Earth. Its Na Yin is 杨柳木, and the branch contains hidden stems 己 · 丁 · 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 May 1991
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 1991-05-13
What is the BaZi day pillar for Monday, May 13, 1991?
In this civil-date reference, the day pillar is 癸未 (Yin Water Goat), cycle position 20 of 60. A personal chart must still resolve the birthplace, local clock time, and day boundary.
What is the Day Master for Monday, May 13, 1991?
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 1991-05-13 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 1991-05-13?
1991-05-13 is day 8 of Start of Summer (立夏) in this date reference. The next solar term is Grain Buds (小满) on 1991-05-21.