Civil-date reference · 2018-05-21
May 21, 2018 BaZi Chart
Monday, May 21, 2018 maps to a reference three-pillar record of 戊戌 · 丁巳 · 癸丑. The hour pillar remains unresolved until birth time and place are supplied.
Answer first: the reference Day Master for 2018-05-21 is Gui · Yin Water, and the day pillar is Yin Water Ox (癸丑). This is a date record, not a complete personal reading.
Deterministic record
2018-05-21 at a glance
| Gregorian date | Monday, May 21, 2018 |
|---|---|
| Lunar date | 农历戊戌年四月初七 · lunar month 四月, day 初七 |
| Reference pillars | 戊戌 · 丁巳 · 癸丑 (year · month · day) |
| Day Master | Gui · Yin Water · heavenly stem 癸 |
| Solar-term position | Day 1 of Grain Buds (小满), beginning 2018-05-21 |
| Next solar term | Grain in Ear (芒种) · 2018-06-06 · 16 days away |
| Western constellation | Gemini (双子) |
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 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 →
Yin Fire Snake · Ding Si
The visible stem is Ding · Yin Fire; the branch is Si · Snake · Fire. Its Na Yin is 沙中土, and the branch contains hidden stems 丙 · 庚 · 戊. Open the full Jiazi record →
Yin Water Ox · Gui Chou
The visible stem is Gui · Yin Water; the branch is Chou · Ox · Earth. Its Na Yin is 桑柘木, and the branch contains hidden stems 己 · 癸 · 辛. 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 2018
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 2018-05-21
What is the BaZi day pillar for Monday, May 21, 2018?
In this civil-date reference, the day pillar is 癸丑 (Yin Water Ox), cycle position 50 of 60. A personal chart must still resolve the birthplace, local clock time, and day boundary.
What is the Day Master for Monday, May 21, 2018?
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 2018-05-21 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 2018-05-21?
2018-05-21 is day 1 of Grain Buds (小满) in this date reference. The next solar term is Grain in Ear (芒种) on 2018-06-06.