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Tong Shu Calendar Reference

Auspicious Business Opening Dates for June 2028開業 · June 2028

By Master Sean Chan · Updated

This month carries Mang Zhong (芒種) — month flips to 午 on June 5 (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 2028 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
24
pass hard requirements
1
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12028-06-02辛酉定 Stabilising井卯 (Rabbit)上吉
22028-06-09戊辰開 Opening角戌 (Dog)吉
32028-06-21庚辰開 Opening室戌 (Dog)吉
42028-06-27丙戌定 Stabilising畢辰 (Dragon)吉
52028-06-13壬申滿 Filling心寅 (Tiger)吉

All days in June 2028

DateDay PillarOfficerMansion ClashNotable factorsClass
2028-06-01庚申平參寅 Tiger月德 · 建除 平 · 宿 參吉
2028-06-02辛酉定井卯 Rabbit天德 · 宿 井上吉
2028-06-03壬戌執鬼辰 Dragon建除 執 · 黃道吉
2028-06-04癸亥破柳巳 SnakeFailed requirement: not_month_break大凶
2028-06-05甲子破星午 HorseFailed requirement: not_month_break大凶
2028-06-06乙丑危張未 Goat建除 危 · 宿 張 · 黃道平
2028-06-07丙寅成翼申 MonkeyFailed requirement: not_year_break大凶
2028-06-08丁卯收軫酉 Rooster宿 軫 · 黃道吉
2028-06-09戊辰開角戌 Dog建除 開吉
2028-06-10己巳閉亢亥 Pig建除 閉 · 宿 亢大凶
2028-06-11庚午建氐子 Rat宿 氐 · 黃道平
2028-06-12辛未除房丑 Ox月德合吉
2028-06-13壬申滿心寅 Tiger建除 滿 · 黃道吉
2028-06-14癸酉平尾卯 Rabbit建除 平 · 黃道平
2028-06-15甲戌定箕辰 Dragon宿 箕吉
2028-06-16乙亥執斗巳 Snake建除 執 · 宿 斗吉
2028-06-17丙子破牛午 HorseFailed requirement: not_month_break大凶
2028-06-18丁丑危女未 Goat建除 危 · 黃道平
2028-06-19戊寅成虛申 MonkeyFailed requirement: not_year_break大凶
2028-06-20己卯收危酉 Rooster四離 · 宿 危 · 黃道凶
2028-06-21庚辰開室戌 Dog建除 開吉
2028-06-22辛巳閉壁亥 Pig月德合 · 建除 閉凶
2028-06-23壬午建奎子 Rat黃道吉
2028-06-24癸未除婁丑 Ox—平
2028-06-25甲申滿胃寅 Tiger建除 滿 · 黃道吉
2028-06-26乙酉平昴卯 Rabbit建除 平 · 黃道平
2028-06-27丙戌定畢辰 Dragon月德吉
2028-06-28丁亥執觜巳 Snake建除 執吉
2028-06-29戊子破參午 HorseFailed requirement: not_month_break大凶
2028-06-30己丑危井未 Goat建除 危 · 宿 井 · 黃道平
Personalised next step

BaZi-Aligned Date Report — June 2028

USD 388

A personalised PDF that re-ranks every business opening-suitable day in June 2028 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

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.