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Tong Shu Calendar Reference

Auspicious Business Opening Dates for March 2026開業 · March 2026

By Master Sean Chan · Updated

This month carries Jing Zhe (驚蟄) — month flips to 卯 on March 5 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in March 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 March
27
pass hard requirements
3
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12026-03-13己丑開 Opening井未 (Goat)上吉
22026-03-23己亥成 Completing房巳 (Snake)上吉
32026-03-08甲申執 Holding胃寅 (Tiger)上吉
42026-03-25辛丑開 Opening尾未 (Goat)吉
52026-03-17癸巳滿 Filling張亥 (Pig)吉

All days in March 2026

DateDay PillarOfficerMansion ClashNotable factorsClass
2026-03-01丁丑閉女未 Goat天德 · 建除 閉 · 黃道平
2026-03-02戊寅建虛申 Monkey宿 虛平
2026-03-03己卯除危酉 Rooster宿 危平
2026-03-04庚辰滿室戌 Dog建除 滿 · 黃道吉
2026-03-05辛巳滿壁亥 Pig建除 滿吉
2026-03-06壬午平奎子 Rat建除 平 · 黃道平
2026-03-07癸未定婁丑 Ox黃道吉
2026-03-08甲申執胃寅 Tiger月德 · 建除 執上吉
2026-03-09乙酉破昴卯 RabbitFailed requirement: not_month_break大凶
2026-03-10丙戌危畢辰 Dragon建除 危平
2026-03-11丁亥成觜巳 Snake建除 成吉
2026-03-12戊子收參午 HorseFailed requirement: not_year_break大凶
2026-03-13己丑開井未 Goat月德合 · 建除 開 · 宿 井上吉
2026-03-14庚寅閉鬼申 Monkey建除 閉 · 黃道凶
2026-03-15辛卯建柳酉 Rooster黃道吉
2026-03-16壬辰除星戌 Dog—平
2026-03-17癸巳滿張亥 Pig建除 滿 · 宿 張吉
2026-03-18甲午平翼子 Rat月德 · 建除 平 · 黃道吉
2026-03-19乙未定軫丑 Ox四離 · 宿 軫 · 黃道凶
2026-03-20丙申執角寅 Tiger建除 執吉
2026-03-21丁酉破亢卯 RabbitFailed requirement: not_month_break大凶
2026-03-22戊戌危氐辰 Dragon建除 危 · 宿 氐凶
2026-03-23己亥成房巳 Snake月德合 · 建除 成上吉
2026-03-24庚子收心午 HorseFailed requirement: not_year_break大凶
2026-03-25辛丑開尾未 Goat建除 開吉
2026-03-26壬寅閉箕申 Monkey建除 閉 · 宿 箕 · 黃道凶
2026-03-27癸卯建斗酉 Rooster宿 斗 · 黃道吉
2026-03-28甲辰除牛戌 Dog月德吉
2026-03-29乙巳滿女亥 Pig建除 滿吉
2026-03-30丙午平虛子 Rat建除 平 · 宿 虛 · 黃道平
2026-03-31丁未定危丑 Ox宿 危 · 黃道平
Personalised next step

BaZi-Aligned Date Report — March 2026

USD 388

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

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.