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Tong Shu Calendar Reference

Auspicious Business Opening Dates for July 2026開業 · July 2026

By Master Sean Chan · Updated

Below is the universal Chinese metaphysics ranking of every day in July 2026 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 July
27
pass hard requirements
6
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12026-07-31己酉滿 Filling卯 (Rabbit)上吉
22026-07-26甲辰Gathering戌 (Dog)上吉
32026-07-02庚辰Opening戌 (Dog)上吉
42026-07-15癸巳Opening亥 (Pig)上吉
52026-07-27乙巳Opening亥 (Pig)上吉

All days in July 2026

DateDay PillarOfficerMansion ClashNotable factorsClass
2026-07-01己卯酉 Rooster黃道
2026-07-02庚辰戌 Dog建除 開 · 宿 參上吉
2026-07-03辛巳亥 Pig月德合 · 建除 閉 · 宿 井
2026-07-04壬午子 Rat黃道
2026-07-05癸未丑 Ox
2026-07-06甲申滿寅 Tiger建除 滿 · 黃道
2026-07-07乙酉滿卯 Rabbit建除 滿 · 宿 張
2026-07-08丙戌辰 Dragon建除 平 · 黃道
2026-07-09丁亥巳 Snake宿 軫 · 黃道
2026-07-10戊子午 HorseFailed requirement: not_year_break大凶
2026-07-11己丑未 GoatFailed requirement: not_month_break大凶
2026-07-12庚寅申 Monkey建除 危 · 宿 氐 · 黃道
2026-07-13辛卯酉 Rooster建除 成 · 黃道
2026-07-14壬辰戌 Dog
2026-07-15癸巳亥 Pig建除 開 · 黃道上吉
2026-07-16甲午子 Rat天德 · 月德 · 建除 閉
2026-07-17乙未丑 Ox宿 斗
2026-07-18丙申寅 Tiger黃道
2026-07-19丁酉滿卯 Rabbit建除 滿
2026-07-20戊戌辰 Dragon建除 平 · 宿 虛 · 黃道
2026-07-21己亥巳 Snake天德合 · 月德合 · 宿 危上吉
2026-07-22庚子午 HorseFailed requirement: not_year_break大凶
2026-07-23辛丑未 GoatFailed requirement: not_month_break大凶
2026-07-24壬寅申 Monkey建除 危 · 黃道
2026-07-25癸卯酉 Rooster建除 成 · 黃道
2026-07-26甲辰戌 Dog天德 · 月德上吉
2026-07-27乙巳亥 Pig建除 開 · 黃道上吉
2026-07-28丙午子 Rat建除 閉
2026-07-29丁未丑 Ox
2026-07-30戊申寅 Tiger宿 參 · 黃道
2026-07-31己酉滿卯 Rabbit天德合 · 月德合 · 建除 滿上吉
Personalised next step

BaZi-Aligned Date Report — July 2026

USD 388

A personalised PDF that re-ranks every business opening-suitable day in July 2026 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.