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Tong Shu Calendar Reference

Auspicious ROM Dates for April 2027註冊結婚 · April 2027

By Master Sean Chan · Updated

This month carries Qing Ming (清明) — month flips to 辰 on April 5 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in April 2027 for civil registration of marriage (ROM in Singapore), derived from the classical Tong Shu (通書). ROM uses a tighter rule set than a full ceremonial wedding — registration is a single act that benefits from 開 (Opening) and 成 (Completing) days and avoids 閉 (Closing) days more strictly than a full banquet.

Top-ranked dates this month

30
days in April
25
pass hard requirements
3
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-04-20壬申Stabilising寅 (Tiger)上吉
22027-04-30壬午滿 Filling子 (Rat)上吉
32027-04-05丁巳Removing亥 (Pig)上吉
42027-04-14丙寅Opening申 (Monkey)
52027-04-26戊寅Opening申 (Monkey)

All days in April 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-04-01癸丑未 GoatFailed requirement: not_year_break大凶
2027-04-02甲寅申 Monkey月德 · 建除 閉 · 黃道
2027-04-03乙卯酉 Rooster建除 建 · 黃道
2027-04-04丙辰戌 Dog
2027-04-05丁巳亥 Pig天德合 · 月德合 · 黃道上吉
2027-04-06戊午滿子 Rat
2027-04-07己未丑 Ox建除 平
2027-04-08庚申寅 Tiger建除 定 · 黃道
2027-04-09辛酉卯 Rabbit宿 井 · 黃道
2027-04-10壬戌辰 DragonFailed requirement: not_month_break大凶
2027-04-11癸亥巳 Snake建除 危 · 黃道
2027-04-12甲子午 Horse建除 成
2027-04-13乙丑未 GoatFailed requirement: not_year_break大凶
2027-04-14丙寅申 Monkey建除 開 · 黃道
2027-04-15丁卯酉 Rooster天德合 · 月德合 · 建除 閉
2027-04-16戊辰戌 Dog建除 建 · 黃道
2027-04-17己巳亥 Pig宿 亢 · 黃道
2027-04-18庚午滿子 Rat宿 氐
2027-04-19辛未丑 Ox建除 平 · 宿 房
2027-04-20壬申寅 Tiger天德 · 月德 · 建除 定上吉
2027-04-21癸酉卯 Rabbit黃道
2027-04-22甲戌辰 DragonFailed requirement: not_month_break大凶
2027-04-23乙亥巳 Snake建除 危 · 宿 斗 · 黃道
2027-04-24丙子午 Horse建除 成
2027-04-25丁丑未 GoatFailed requirement: not_year_break大凶
2027-04-26戊寅申 Monkey建除 開 · 黃道
2027-04-27己卯酉 Rooster建除 閉 · 宿 危
2027-04-28庚辰戌 Dog建除 建 · 黃道
2027-04-29辛巳亥 Pig黃道
2027-04-30壬午滿子 Rat天德 · 月德上吉
Personalised next step

BaZi-Aligned Date Report — April 2027

USD 388

A personalised PDF that re-ranks every ROM / civil registration-suitable day in April 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.

Does the timing of ROM matter as much as a wedding ceremony?

Energetically yes — the registration is the legal-binding moment, and the day-pillar element it sits on travels with the marriage record. Practically the rule set is slightly looser than a full banquet (no need for 喜慶 stars), but month-break and year-break disqualifiers still apply absolutely.

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.