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Tong Shu Calendar Reference

Auspicious Business Opening Dates for August 2027開業 · August 2027

By Master Sean Chan · Updated

Below is the universal Chinese metaphysics ranking of every day in August 2027 for opening a business (開市), derived from the classical Tong Shu (通書). Opening is treated as a 'beginning' — the rules favour 開 (Opening) and 建 (Establishing) officers and Yellow Dao days carrying 天德 / 月德 protection.

Top-ranked dates this month

31
days in August
27
pass hard requirements
6
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-08-28壬午Opening子 (Rat)上吉
22027-08-14戊辰Completing戌 (Dog)上吉
32027-08-05己未Establishing丑 (Ox)上吉
42027-08-03丁巳Opening亥 (Pig)上吉
52027-08-08壬戌滿 Filling辰 (Dragon)上吉

All days in August 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-08-01乙卯酉 Rooster建除 成 · 黃道
2027-08-02丙辰戌 Dog
2027-08-03丁巳亥 Pig建除 開 · 宿 張 · 黃道上吉
2027-08-04戊午子 Rat建除 閉
2027-08-05己未丑 Ox天德合 · 月德合 · 宿 軫上吉
2027-08-06庚申寅 Tiger黃道
2027-08-07辛酉卯 Rabbit四絕 · 宿 亢大凶
2027-08-08壬戌滿辰 Dragon月德 · 建除 滿 · 宿 氐上吉
2027-08-09癸亥巳 Snake天德 · 建除 平
2027-08-10甲子午 Horse黃道
2027-08-11乙丑未 GoatFailed requirement: not_year_break大凶
2027-08-12丙寅申 MonkeyFailed requirement: not_month_break大凶
2027-08-13丁卯酉 Rooster月德合 · 建除 危 · 宿 斗
2027-08-14戊辰戌 Dog天德合 · 建除 成 · 黃道上吉
2027-08-15己巳亥 Pig黃道
2027-08-16庚午子 Rat建除 開 · 宿 虛
2027-08-17辛未丑 Ox建除 閉 · 宿 危 · 黃道
2027-08-18壬申寅 Tiger月德
2027-08-19癸酉卯 Rabbit天德
2027-08-20甲戌滿辰 Dragon建除 滿 · 黃道
2027-08-21乙亥巳 Snake建除 平
2027-08-22丙子午 Horse黃道
2027-08-23丁丑未 GoatFailed requirement: not_year_break大凶
2027-08-24戊寅申 MonkeyFailed requirement: not_month_break大凶
2027-08-25己卯酉 Rooster建除 危
2027-08-26庚辰戌 Dog建除 成 · 宿 參 · 黃道上吉
2027-08-27辛巳亥 Pig宿 井 · 黃道
2027-08-28壬午子 Rat月德 · 建除 開上吉
2027-08-29癸未丑 Ox天德 · 建除 閉 · 黃道
2027-08-30甲申寅 Tiger
2027-08-31乙酉卯 Rabbit宿 張
Personalised next step

BaZi-Aligned Date Report — August 2027

USD 388

A personalised PDF that re-ranks every business opening-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.

Methodology

Day pillars derive from the standard 60 Jiazi anchor (sexagenary day cycle, anchored against the published Tong Shu). Year pillars switch on Li Chun (立春), the first solar term of the BaZi year, computed from the truncated VSOP87 series for solar longitude. Month pillars switch on each sectional solar term. The Twelve Officers are the day branch’s offset from the month branch; the Twenty-Eight Mansions cycle every 28 days against an authoritative anchor.

Per-purpose rules follow the Dong Gong (董公擇日) tradition with adjustments encoded in our open purpose_rules.yaml. Scores are additive over the day’s present 神煞, the officer/mansion preference, and the Yellow Dao bonus, then clamped to 0–100 and classified.