Ding (丁) is the fourth heavenly stem and the yin form of Fire. If Ding is your Day Master, it is the stem above your day pillar — the character the rest of the chart is interpreted against.
Ding Fire is the Yin form of Fire, one of the ten Day Masters. New to this? Start with what a Day Master is and how it is calculated.
Ding is contained flame: a candle, a lamp, a pilot light. Unlike Bing it does not fall on everything indiscriminately — it illuminates what it is pointed at, which is why Ding is the stem of focused attention rather than broad warmth.
Ding tends to be perceptive in a way that is easy to underestimate. It reads rooms accurately, notices what was left unsaid, and is often the person who understood the situation first and mentioned it last. Its warmth is real but selective, given to particular people rather than broadcast.
A candle also needs shelter. Ding charts commonly show sensitivity to environment that the person has learned to treat as a flaw — the flame genuinely does go out in wind, and the correct response is to manage the wind rather than to resent the flame. Ding's failure mode is burning steadily in a place that was never worth lighting.
Fire is produced by Wood and controls Metal; Water controls it and Earth drains it. For Ding this means Wood is support, Metal is wealth, Water is pressure and authority, and Earth is expression. Ding is more vulnerable to Water than Bing — a lamp is extinguished where the sun is not — so the presence and position of Water is usually the first thing a reader looks at in a Ding chart.
These relationships are the Ten Gods (十神). They are not personality labels — they describe what another stem does to your Day Master when it appears in your chart. This table is generated from the same function the chart tool uses, so it matches what the calculator would tell you.
| Stem | Relation to Ding Fire | What it does to Ding Fire |
|---|---|---|
| Jia Wood 甲 | Direct Resource 正印 | Wood feeds candle and lamp steadily — support and schooling. |
| Yi Wood 乙 | Indirect Resource 偏印 | Wood feeds candle and lamp unevenly — sideways insight. |
| Bing Fire 丙 | Rob Wealth 劫財 | Fire of the other polarity beside candle and lamp — money leaves through people. |
| Ding Fire 丁 | Friend 比肩 | A true peer for candle and lamp; a rival for the same ground. |
| Wu Earth 戊 | Hurting Officer 傷官 | candle and lamp outputs Earth sharply — brilliance that cuts. |
| Ji Earth 己 | Eating God 食神 | candle and lamp outputs Earth easily — talent that flows. |
| Geng Metal 庚 | Direct Wealth 正財 | candle and lamp works Metal steadily — earned in proportion to effort. |
| Xin Metal 辛 | Indirect Wealth 偏財 | candle and lamp works Metal in lumps — windfalls, not salary. |
| Ren Water 壬 | Direct Officer 正官 | Water shapes candle and lamp — structure you accept. |
| Gui Water 癸 | Seven Killings 七殺 | Water cuts at candle and lamp — pressure that asks no permission. |
What each of the ten relations means in general — Direct Wealth, Seven Killings, Hurting Officer and the rest — is set out in the Ten Gods glossary.
Classical BaZi grades a stem by the season it was born into — the 旺相休囚死 scale. Fire peaks in summer, is supported in spring, and is at its weakest in winter when Water rules.
| Birth season | Grade | What it does to Ding Fire |
|---|---|---|
| Spring (寅卯辰 · Feb–Apr) | 相 Supported | Wood feeds the lamp steadily. Well-supplied and unhurried; Ding in spring rarely burns out. |
| Summer (巳午未 · May–Jul) | 旺 Peak | A candle at noon. Ding is at seasonal peak yet easily outshone — its advantage is precision, never volume. |
| Autumn (申酉戌 · Aug–Oct) | 囚 Confined | Refining Metal is exactly what a lamp flame is for. Confined by season, but this is Ding doing its proper work. |
| Winter (亥子丑 · Nov–Jan) | 死 Weakest | Water rules and a small flame is vulnerable. Shelter matters more here than in any other season. |
Fire corresponds to Red / purple, the numbers 2, 7, and the direction South. These are traditional correspondences for the element itself. They are not a prescription — whether Fire is helpful to you depends on your whole chart, not on your Day Master alone.
8 October 1979, born in Hong Kong — day pillar 丁酉 (Ding You).
The day stem is 丁 and the birth month is 酉 — mid-autumn, when Metal rules. Fire is confined here: Ding is doing the work of melting Metal without seasonal support. That reads as capability earned the hard way. This date also falls inside Hong Kong's intermittent daylight-saving history, which the chart tool corrects for — a detail that matters for births near a day boundary.
How the day pillar is derived — solar terms, true solar time and the late Zi hour — and what a Day Master cannot tell you on its own, are covered on what is a Day Master.
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