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Tong Shu Calendar Reference

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

By Master Sean Chan · Updated

This month carries Li Xia (立夏) — start of the BaZi summer on May 6 (Singapore time): the BaZi calendar's sectional boundary for the month. Mid-month transition into the BaZi summer; element balance shifts noticeably across the term.Below is the universal Chinese metaphysics ranking of every day in May 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

31
days in May
24
pass hard requirements
5
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-05-09辛卯開 Opening柳酉 (Rooster)上吉
22027-05-08庚寅收 Gathering鬼申 (Monkey)上吉
32027-05-28庚戌執 Holding奎辰 (Dragon)上吉
42027-05-13乙未滿 Filling軫丑 (Ox)上吉
52027-05-24丙午除 Removing虛子 (Rat)上吉

All days in May 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-05-01癸未平婁丑 Ox建除 平平
2027-05-02甲申定胃寅 Tiger建除 定 · 黃道吉
2027-05-03乙酉執昴卯 Rabbit黃道吉
2027-05-04丙戌破畢辰 DragonFailed requirement: not_month_break大凶
2027-05-05丁亥破觜巳 SnakeFailed requirement: not_month_break大凶
2027-05-06戊子危參午 Horse建除 危平
2027-05-07己丑成井未 GoatFailed requirement: not_year_break大凶
2027-05-08庚寅收鬼申 Monkey月德 · 建除 收上吉
2027-05-09辛卯開柳酉 Rooster天德 · 建除 開上吉
2027-05-10壬辰閉星戌 Dog建除 閉 · 黃道平
2027-05-11癸巳建張亥 Pig建除 建 · 宿 張吉
2027-05-12甲午除翼子 Rat黃道吉
2027-05-13乙未滿軫丑 Ox月德合 · 宿 軫 · 黃道上吉
2027-05-14丙申平角寅 Tiger天德合 · 建除 平吉
2027-05-15丁酉定亢卯 Rabbit建除 定 · 宿 亢吉
2027-05-16戊戌執氐辰 Dragon宿 氐 · 黃道平
2027-05-17己亥破房巳 SnakeFailed requirement: not_month_break大凶
2027-05-18庚子危心午 Horse月德 · 建除 危 · 宿 心吉
2027-05-19辛丑成尾未 GoatFailed requirement: not_year_break大凶
2027-05-20壬寅收箕申 Monkey建除 收吉
2027-05-21癸卯開斗酉 Rooster建除 開 · 宿 斗吉
2027-05-22甲辰閉牛戌 Dog建除 閉 · 黃道平
2027-05-23乙巳建女亥 Pig月德合 · 建除 建 · 宿 女吉
2027-05-24丙午除虛子 Rat天德合 · 黃道上吉
2027-05-25丁未滿危丑 Ox宿 危 · 黃道平
2027-05-26戊申平室寅 Tiger建除 平平
2027-05-27己酉定壁卯 Rabbit建除 定吉
2027-05-28庚戌執奎辰 Dragon月德 · 黃道上吉
2027-05-29辛亥破婁巳 SnakeFailed requirement: not_month_break大凶
2027-05-30壬子危胃午 Horse建除 危平
2027-05-31癸丑成昴未 GoatFailed requirement: not_year_break大凶
Personalised next step

BaZi-Aligned Date Report — May 2027

USD 388

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

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.