Skip to content
Tong Shu Calendar Reference

Auspicious Business Opening Dates for February 2027開業 · February 2027

By Master Sean Chan · Updated

This month carries Li Chun (立春) — start of the BaZi year on February 4 (Singapore time): the BaZi calendar's sectional boundary for the month. Pre-Li-Chun days still belong to the previous BaZi year — factor that into anything date-binding (registration, ground-breaking).Below is the universal Chinese metaphysics ranking of every day in February 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

28
days in February
24
pass hard requirements
5
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-02-23丙子Opening午 (Horse)上吉
22027-02-02乙卯滿 Filling酉 (Rooster)上吉
32027-02-09壬戌Completing辰 (Dragon)上吉
42027-02-11甲子Opening午 (Horse)上吉
52027-02-18辛未Holding丑 (Ox)上吉

All days in February 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-02-01甲寅申 Monkey宿 虛 · 黃道
2027-02-02乙卯滿酉 Rooster天德合 · 月德合 · 建除 滿上吉
2027-02-03丙辰戌 Dog四絕 · 建除 平大凶
2027-02-04丁巳亥 Pig天德 · 建除 平 · 黃道
2027-02-05戊午子 Rat
2027-02-06己未丑 Ox建除 執 · 黃道
2027-02-07庚申寅 TigerFailed requirement: not_month_break大凶
2027-02-08辛酉卯 Rabbit月德合 · 建除 危
2027-02-09壬戌辰 Dragon天德合 · 建除 成 · 黃道上吉
2027-02-10癸亥巳 Snake
2027-02-11甲子午 Horse建除 開 · 宿 參 · 黃道上吉
2027-02-12乙丑未 GoatFailed requirement: not_year_break大凶
2027-02-13丙寅申 Monkey月德
2027-02-14丁卯酉 Rooster天德
2027-02-15戊辰滿戌 Dog建除 滿 · 黃道
2027-02-16己巳亥 Pig建除 平 · 宿 張 · 黃道
2027-02-17庚午子 Rat
2027-02-18辛未丑 Ox月德合 · 建除 執 · 宿 軫上吉
2027-02-19壬申寅 TigerFailed requirement: not_month_break大凶
2027-02-20癸酉卯 Rabbit建除 危 · 宿 亢
2027-02-21甲戌辰 Dragon建除 成 · 宿 氐 · 黃道
2027-02-22乙亥巳 Snake
2027-02-23丙子午 Horse月德 · 建除 開 · 黃道上吉
2027-02-24丁丑未 GoatFailed requirement: not_year_break大凶
2027-02-25戊寅申 Monkey宿 箕
2027-02-26己卯酉 Rooster宿 斗
2027-02-27庚辰滿戌 Dog建除 滿 · 黃道
2027-02-28辛巳亥 Pig月德合 · 建除 平 · 黃道
Personalised next step

BaZi-Aligned Date Report — February 2027

USD 388

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