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Tong Shu Calendar Reference

Auspicious ROM Dates for August 2027註冊結婚 · August 2027

By Master Sean Chan · Updated

This month carries Li Qiu (立秋) — start of the BaZi autumn on August 8 (Singapore time): the BaZi calendar's sectional boundary for the month. Autumn proper begins with this term; Wood-day rankings tend to weaken from this point.Below is the universal Chinese metaphysics ranking of every day in August 2027 for civil registration of marriage (ROM in Singapore), derived from the classical Tong Shu (通書). ROM uses a tighter rule set than a full ceremonial wedding — registration is a single act that benefits from 開 (Opening) and 成 (Completing) days and avoids 閉 (Closing) days more strictly than a full banquet.

Top-ranked dates this month

31
days in August
27
pass hard requirements
8
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-08-14戊辰成 Completing牛戌 (Dog)上吉
22027-08-28壬午開 Opening鬼子 (Rat)上吉
32027-08-05己未建 Establishing軫丑 (Ox)上吉
42027-08-03丁巳開 Opening張亥 (Pig)上吉
52027-08-01乙卯成 Completing柳酉 (Rooster)上吉

All days in August 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-08-01乙卯成柳酉 Rooster建除 成 · 黃道上吉
2027-08-02丙辰收星戌 Dog建除 收吉
2027-08-03丁巳開張亥 Pig建除 開 · 宿 張 · 黃道上吉
2027-08-04戊午閉翼子 Rat建除 閉平
2027-08-05己未建軫丑 Ox天德合 · 月德合 · 建除 建上吉
2027-08-06庚申除角寅 Tiger黃道吉
2027-08-07辛酉除亢卯 Rabbit四絕 · 宿 亢凶
2027-08-08壬戌滿氐辰 Dragon月德 · 宿 氐 · 黃道吉
2027-08-09癸亥平房巳 Snake天德 · 建除 平 · 宿 房吉
2027-08-10甲子定心午 Horse建除 定 · 宿 心 · 黃道上吉
2027-08-11乙丑執尾未 GoatFailed requirement: not_year_break大凶
2027-08-12丙寅破箕申 MonkeyFailed requirement: not_month_break大凶
2027-08-13丁卯危斗酉 Rooster月德合 · 建除 危 · 宿 斗吉
2027-08-14戊辰成牛戌 Dog天德合 · 建除 成 · 黃道上吉
2027-08-15己巳收女亥 Pig建除 收 · 宿 女 · 黃道吉
2027-08-16庚午開虛子 Rat建除 開吉
2027-08-17辛未閉危丑 Ox建除 閉 · 宿 危 · 黃道凶
2027-08-18壬申建室寅 Tiger月德 · 建除 建吉
2027-08-19癸酉除壁卯 Rabbit天德上吉
2027-08-20甲戌滿奎辰 Dragon黃道吉
2027-08-21乙亥平婁巳 Snake建除 平平
2027-08-22丙子定胃午 Horse建除 定 · 黃道吉
2027-08-23丁丑執昴未 GoatFailed requirement: not_year_break大凶
2027-08-24戊寅破畢申 MonkeyFailed requirement: not_month_break大凶
2027-08-25己卯危觜酉 Rooster建除 危平
2027-08-26庚辰成參戌 Dog建除 成 · 黃道上吉
2027-08-27辛巳收井亥 Pig建除 收 · 宿 井 · 黃道吉
2027-08-28壬午開鬼子 Rat月德 · 建除 開上吉
2027-08-29癸未閉柳丑 Ox天德 · 建除 閉 · 黃道吉
2027-08-30甲申建星寅 Tiger建除 建平
2027-08-31乙酉除張卯 Rabbit宿 張吉
Personalised next step

BaZi-Aligned Date Report — August 2027

USD 388

A personalised PDF that re-ranks every ROM / civil registration-suitable day in August 2027 against your BaZi (and, for weddings/ROM, your partner’s BaZi). It surfaces:

Order the report →

See the full glossary of classical date-selection terms in the BaZi Glossary & Auxiliary Stars.

Further reading from the blog

Selected posts from Master Sean Chan's blog covering this topic and closely related ones in practice:

Frequently asked

Why isn’t my day on the list of top 5?

The top list is the universal ranking before any personal adjustment. Many couples find their best date isn’t in the top 5. Once you account for your day pillars, the right day often shifts. That’s exactly the gap the BaZi-Aligned Date Report fills.

What does 大凶 mean and can it ever be overridden?

大凶 means the day fails a hard classical requirement: 月破 (month break), 歲破 (year break), or 四離/四絕 (a quarter-day boundary). These cannot be overridden by personal alignment; they are excluded categorically. Choose another day.

Why don’t you show times here?

Hour selection is personal. The right hour depends on your day pillar and the chosen day’s element relationship to it. Publishing universal “auspicious hours” misleads readers into thinking a generic hour is safe; it isn’t. Hours are included in the personalised report.

Where do these scores come from?

The classical Tong Shu (通書) tradition: 建除十二神 (Twelve Officers), 二十八宿 (Twenty-Eight Mansions), 月德 / 天德 (monthly and yearly virtue stars), 黃黑道 (Yellow/Black Dao), and the Dong Gong (董公) per-purpose rules. We compute these directly from astronomical solar terms — no app shortcuts.

Does the timing of ROM matter as much as a wedding ceremony?

Energetically yes — the registration is the legal-binding moment, and the day-pillar element it sits on travels with the marriage record. Practically the rule set is slightly looser than a full banquet (no need for 喜慶 stars), but month-break and year-break disqualifiers still apply absolutely.

Methodology

Pillars use the 60 Jiazi day cycle anchored to the published Tong Shu. The BaZi year flips at Li Chun, the BaZi month flips at each sectional solar term — both computed from VSOP87 ephemeris data. The Twelve Officers (建除) and the 28 Mansions each have their own deterministic rotation against an authoritative anchor.

Weights come from the Dong Gong (董公擇日) school. Auspicious 神煞 add, taboo 神煞 subtract, the officer and mansion adjust, Yellow Dao adds a small bonus on top. Sum, clamp to 0–100, classify. No app shortcuts.