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Tong Shu Calendar Reference

Auspicious Business Opening Dates for June 2027開業 · June 2027

By Master Sean Chan · Updated

This month carries Mang Zhong (芒種) — month flips to 午 on June 6 (Singapore time): the BaZi calendar's sectional boundary for the month. Summer solstice (夏至) follows shortly after — peak Yang energy before the long descent.Below is the universal Chinese metaphysics ranking of every day in June 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

30
days in June
26
pass hard requirements
2
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-06-02乙卯Opening酉 (Rooster)上吉
22027-06-13丙寅Completing申 (Monkey)上吉
32027-06-15戊辰Opening戌 (Dog)
42027-06-27庚辰Opening戌 (Dog)
52027-06-18辛未Removing丑 (Ox)

All days in June 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-06-01甲寅申 Monkey
2027-06-02乙卯酉 Rooster月德合 · 建除 開上吉
2027-06-03丙辰戌 Dog天德合 · 建除 閉 · 宿 參
2027-06-04丁巳亥 Pig宿 井
2027-06-05戊午子 Rat黃道
2027-06-06己未丑 Ox
2027-06-07庚申滿寅 Tiger建除 滿 · 黃道
2027-06-08辛酉卯 Rabbit月德合 · 建除 平 · 宿 張
2027-06-09壬戌辰 Dragon
2027-06-10癸亥巳 Snake建除 執 · 宿 軫
2027-06-11甲子午 HorseFailed requirement: not_month_break大凶
2027-06-12乙丑未 GoatFailed requirement: not_year_break大凶
2027-06-13丙寅申 Monkey月德 · 建除 成 · 宿 氐上吉
2027-06-14丁卯酉 Rooster黃道
2027-06-15戊辰戌 Dog建除 開
2027-06-16己巳亥 Pig建除 閉
2027-06-17庚午子 Rat宿 箕 · 黃道
2027-06-18辛未丑 Ox月德合 · 宿 斗
2027-06-19壬申滿寅 Tiger建除 滿 · 黃道
2027-06-20癸酉卯 Rabbit四離 · 建除 平 · 黃道
2027-06-21甲戌辰 Dragon宿 虛
2027-06-22乙亥巳 Snake建除 執 · 宿 危
2027-06-23丙子午 HorseFailed requirement: not_month_break大凶
2027-06-24丁丑未 GoatFailed requirement: not_year_break大凶
2027-06-25戊寅申 Monkey建除 成
2027-06-26己卯酉 Rooster黃道
2027-06-27庚辰戌 Dog建除 開
2027-06-28辛巳亥 Pig月德合 · 建除 閉
2027-06-29壬午子 Rat黃道
2027-06-30癸未丑 Ox
Personalised next step

BaZi-Aligned Date Report — June 2027

USD 388

A personalised PDF that re-ranks every business opening-suitable day in June 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.

Should I open the business on the same day as my company registration?

If you can — yes. Aligning the opening with the legal incorporation compounds the day’s influence on both events. If they have to be different, prioritise the opening (the customer-facing first day) over the registration date.

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.