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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乙卯開 Opening觜酉 (Rooster)上吉
22027-06-13丙寅成 Completing氐申 (Monkey)上吉
32027-06-15戊辰開 Opening心戌 (Dog)吉
42027-06-27庚辰開 Opening胃戌 (Dog)吉
52027-06-18辛未除 Removing斗丑 (Ox)吉

All days in June 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-06-01甲寅收畢申 Monkey—平
2027-06-02乙卯開觜酉 Rooster月德合 · 建除 開上吉
2027-06-03丙辰閉參戌 Dog天德合 · 建除 閉 · 宿 參平
2027-06-04丁巳建井亥 Pig宿 井吉
2027-06-05戊午建鬼子 Rat黃道吉
2027-06-06己未除柳丑 Ox—平
2027-06-07庚申滿星寅 Tiger建除 滿 · 黃道吉
2027-06-08辛酉平張卯 Rabbit月德合 · 建除 平 · 宿 張吉
2027-06-09壬戌定翼辰 Dragon—平
2027-06-10癸亥執軫巳 Snake建除 執 · 宿 軫吉
2027-06-11甲子破角午 HorseFailed requirement: not_month_break大凶
2027-06-12乙丑危亢未 GoatFailed requirement: not_year_break大凶
2027-06-13丙寅成氐申 Monkey月德 · 建除 成 · 宿 氐上吉
2027-06-14丁卯收房酉 Rooster黃道吉
2027-06-15戊辰開心戌 Dog建除 開吉
2027-06-16己巳閉尾亥 Pig建除 閉凶
2027-06-17庚午建箕子 Rat宿 箕 · 黃道吉
2027-06-18辛未除斗丑 Ox月德合 · 宿 斗吉
2027-06-19壬申滿牛寅 Tiger建除 滿 · 黃道吉
2027-06-20癸酉平女卯 Rabbit四離 · 建除 平 · 黃道凶
2027-06-21甲戌定虛辰 Dragon宿 虛平
2027-06-22乙亥執危巳 Snake建除 執 · 宿 危平
2027-06-23丙子破室午 HorseFailed requirement: not_month_break大凶
2027-06-24丁丑危壁未 GoatFailed requirement: not_year_break大凶
2027-06-25戊寅成奎申 Monkey建除 成吉
2027-06-26己卯收婁酉 Rooster黃道吉
2027-06-27庚辰開胃戌 Dog建除 開吉
2027-06-28辛巳閉昴亥 Pig月德合 · 建除 閉凶
2027-06-29壬午建畢子 Rat黃道吉
2027-06-30癸未除觜丑 Ox—平
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.