The twelve two-hour shichen windows each carry a distinct Earthly Branch energy. Match the right window to your chart’s Useful God and act when the current is with you.
Every day is divided into twelve two-hour periods called shichen (時辰), each ruled by one of the twelve Earthly Branches (Zi → Hai). Your lucky hours are the shichen whose branch contains or produces your chart’s Useful God (Yong Shen) — the element your Four Pillars chart needs most to stay balanced. A full BaZi or Saju reading is required to identify your Useful God accurately, because the same Day Master can need different elements depending on the season of birth and overall chart structure.
Classical Chinese astronomers divided the solar day into twelve equal units of 120 minutes, each named after one of the twelve Earthly Branches (地支). The sequence begins at the Zi hour (23:00–01:00) and moves through Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, and closes with Hai (21:00–23:00). This cycle maps onto the twelve animals of the Chinese zodiac, but in BaZi the branch itself — not the animal — carries the elemental content that matters for chart analysis.
In a Four Pillars (BaZi) or Korean Saju chart, the birth shichen produces the Hour Pillar. Its Heavenly Stem is calculated from the Day Stem using a fixed formula (the Five Rat Theorem / wu zi jian yin fa), and its Earthly Branch is simply the shichen in which you were born. The Hour Pillar governs the latter years of life, descendants, and the quality of effort in daily work.
Key distinction: In everyday usage “lucky hours” refers not to the fixed Hour Pillar of your birth chart, but to the daily rotation of shichen — selecting which two-hour window today best supports your elemental needs.
| Branch (Chinese) | Animal | Clock time | Hidden stems (main element) | Element quality |
|---|---|---|---|---|
| 子 Zi | Rat | 23:00–01:00 | Gui 癸 (Yang Water) | Pure Water |
| 丑 Chou | Ox | 01:00–03:00 | Ji 己, Gui 癸, Xin 辖 (Earth main) | Yin Earth, Water & Metal hidden |
| 寅 Yin | Tiger | 03:00–05:00 | Jia 甲, Bing 亲, Wu 戊 (Wood main) | Yang Wood, Fire & Earth hidden |
| 卡 Mao | Rabbit | 05:00–07:00 | Yi 乙 (Yin Wood) | Pure Wood |
| 辰 Chen | Dragon | 07:00–09:00 | Wu 戊, Yi 乙, Gui 癸 (Earth main) | Yang Earth, Wood & Water hidden |
| 已 Si | Snake | 09:00–11:00 | Bing 亲, Wu 戊, Geng 庚 (Fire main) | Yang Fire, Earth & Metal hidden |
| 午 Wu | Horse | 11:00–13:00 | Ding 丁, Ji 己 (Fire main) | Yin Fire, Earth hidden |
| 未 Wei | Goat | 13:00–15:00 | Ji 己, Ding 丁, Yi 乙 (Earth main) | Yin Earth, Fire & Wood hidden |
| 申 Shen | Monkey | 15:00–17:00 | Geng 庚, Ren 壬, Wu 戊 (Metal main) | Yang Metal, Water & Earth hidden |
| 酉 You | Rooster | 17:00–19:00 | Xin 辖 (Yin Metal) | Pure Metal |
| 招 Xu | Dog | 19:00–21:00 | Wu 戊, Xin 辖, Ding 丁 (Earth main) | Yang Earth, Metal & Fire hidden |
| 兹 Hai | Pig | 21:00–23:00 | Ren 壬, Jia 甲 (Water main) | Yang Water, Wood hidden |
Hidden stems are listed in order of strength within the branch. “Main element” is the dominant stem that practitioners weigh most heavily when assessing elemental support.
Your Day Master (日主, il-gan in Korean) is the Heavenly Stem of the Day Pillar — one of the ten stems: Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, or Gui. It represents your core elemental identity and is the anchor from which chart strength is measured. You need an accurate birth date (year, month, day, and hour) to calculate it.
A “strong” or “rooted” Day Master needs elements that restrain or drain it; a “weak” Day Master needs elements that produce or assist it. The Useful God is whichever element corrects the chart’s imbalance most efficiently. This is not a fixed rule by Day Master alone — it depends on the month of birth (which determines seasonal strength), the other three pillars, and whether special chart formats apply. This is the step that genuinely requires a skilled reading.
Using the table above, identify which branches contain or produce your Useful God as their main or prominent hidden stem. Those shichen are your supportive hours. Branches whose main element clashes with or weakens your Useful God are hours to approach with more caution for high-stakes decisions.
Worked example: A Ding 丁 (Yin Fire) Day Master born in the tenth lunar month (autumn — strong Metal season) is typically weak and needs Wood to produce Fire and Water to control the dominant Metal. The Hai hour (21:00–23:00, main Water + hidden Wood) and Yin hour (03:00–05:00, main Wood) are therefore strongly supportive. The You hour (17:00–19:00, pure Metal) reinforces the chart’s already dominant element and is less ideal for initiatives requiring personal boldness.
Each shichen on a given day carries not just its fixed Earthly Branch but also a Heavenly Stem derived from the day’s stem via the Five Rat Theorem. On a Jia or Ji day, the Zi hour opens with Jia 甲 (Yang Wood); on a Yi or Geng day, the Zi hour opens with Bing 亲 (Yang Fire). The full Stem-Branch combination creates sixty possible pillars, adding nuance — a Water branch whose stem is also Water is stronger Water than one whose stem is Metal.
For everyday scheduling most practitioners simplify to branch-element matching. When the stakes are higher — a contract signing, a business launch, a major negotiation — the full Stem-Branch picture and its relationship to your natal pillars is worth examining.
| Elemental character of shichen | Traditionally favourable activities |
|---|---|
| Wood hours (Yin 03–05, Mao 05–07) | Planning, growth initiatives, creative work, new projects, health appointments |
| Fire hours (Si 09–11, Wu 11–13) | Presentations, networking, visibility actions, persuasion, public-facing work |
| Earth hours (Chen 07–09, Wei 13–15, Xu 19–21, Chou 01–03) | Consolidation, property matters, negotiation, stabilising agreements |
| Metal hours (Shen 15–17, You 17–19) | Precision work, legal review, financial decisions, cutting commitments |
| Water hours (Hai 21–23, Zi 23–01) | Research, reflection, communication, travel planning, career strategy |
These are general correspondences. Whether a Fire hour helps you depends entirely on whether Fire is your Useful God or its adversary. Do not apply generic “lucky hour” lists without reference to your own chart.
The shichen boundaries are defined by the sun’s position, not by administrative clock time. Two adjustments matter:
For birth chart Hour Pillars, applying the longitude correction is standard practice and can shift the branch by one full shichen near boundaries. For daily scheduling, local clock time is an acceptable approximation when the correction is under 15 minutes.
A common question is whether to focus on the Hour Pillar of the natal chart or the flowing shichen of the day. The answer is both, in different roles:
Selecting a shichen from a reference table is a useful starting point. For decisions with long-term consequences, classical date-selection (Korean: taekil, Chinese: ze ri) layers four additional checks:
Practitioners avoid dates where the day branch directly clashes with the client’s Day Master branch (liu chong), or where the hour branch forms a penalty (xing) with the day branch, regardless of the hour’s standalone elemental quality.
Get your full Four Pillars reading — identify your Useful God and best daily windows Detailed BaZi analysis · Secure payment via KG Inicis · $7.99 one-timeYour reading covers Day Master strength assessment, Useful God identification, Luck Pillar timing, and the shichen windows most aligned with your chart.
Shichen (時蹾) are the twelve two-hour periods that divide each day in classical Chinese timekeeping, each governed by one of the twelve Earthly Branches (Zi through Hai). In BaZi and Korean Saju, the shichen of birth determines the Hour Pillar — the fourth of the Four Pillars. Practitioners also read the daily shichen rotation to identify which hours carry branch energies that harmonise or clash with a person’s Useful God, informing when to act on important matters.
First identify your Day Master and your chart’s Useful God — the element that corrects your chart’s imbalance. Then locate the shichen whose main branch element contains or produces that Useful God (see the table above). A weak Wood Day Master in an autumn chart typically needs Water; the Hai hour (21:00–23:00, main Water) and Zi hour (23:00–01:00, pure Water) are therefore most supportive. Chart structure varies enough that a full reading is necessary before relying on this for significant decisions.
The twelve branch slots repeat every day, but each carries a different Heavenly Stem depending on the day’s own stem, creating unique Stem-Branch combinations. The Zi hour on a Jia day pairs Jia 甲 (Yang Wood) with Zi — a Wood-Water combination. The same Zi hour on a Yi day pairs Bing 亲 (Yang Fire) with Zi — a Fire-Water combination with different dynamics. Active Luck Pillars and annual branch energies further shift which shichen are most active for you personally each year.
Yes — choosing a supportive shichen for high-stakes actions is a core application. For contracts and business launches, practitioners typically also check that the day branch does not clash with the Day Master’s natal branch, and that the hour branch does not form a structural penalty (xing) with the day. For major events a full taekil (auspicious-date) reading examines year, month, day, and hour together to avoid compounding clashes across all four columns.
For the birth chart Hour Pillar, yes — true solar time is standard practice and can differ from clock time by up to 30–35 minutes for cities far from a time zone’s central meridian. Subtract roughly 4 minutes per degree of longitude west of the meridian, add 4 minutes per degree east. Seoul at 126.98°E is about 8 degrees west of the KST meridian (135°E), giving a −32-minute adjustment. For daily lucky-hour scheduling, local clock time is an acceptable working approximation when your location is within 10–15 minutes of the zone meridian.
A BaZi or Saju lucky hour is chart-specific: it is the shichen whose branch supports your Useful God. A general auspicious hour in classical date-selection (ze ri xue) is derived from the day’s Stem-Branch using systems such as the Twelve Day Officers or Flying Stars and applies more broadly across people. Professional taekil readings combine both — first finding a day whose branch favours the individual’s chart, then selecting the hour within that day using the same criteria.
Without a confirmed birth hour, the Hour Pillar cannot be reliably set, and hourly timing advice loses its most personalised layer. Practitioners use a technique called “hour rectification” (shichen jiao zheng) — cross-referencing known life events against candidate Hour Pillars to narrow down the birth shichen. Even without this, the Year, Month, and Day Pillars provide a solid foundation for Luck Pillar and annual timing analysis.