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Tong Shu Calendar Reference

Auspicious Renovation Start Dates for May 2026裝修 · May 2026

By Master Sean Chan · Updated

This month carries Li Xia (立夏) — start of the BaZi summer on May 5 (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 2026 for breaking ground on renovation (動土 / 修造), derived from the classical Tong Shu (通書). Renovation is an Earth-disturbing act and is more sensitive to Earth-related taboos than weddings or business openings.

Top-ranked dates this month

31
days in May
27
pass hard requirements
6
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12026-05-24辛丑成 Completing女未 (Goat)上吉
22026-05-14辛卯開 Opening軫酉 (Rooster)上吉
32026-05-09丙戌執 Holding鬼辰 (Dragon)上吉
42026-05-08乙酉定 Stabilising井卯 (Rabbit)上吉
52026-05-12己丑成 Completing張未 (Goat)上吉

All days in May 2026

DateDay PillarOfficerMansion ClashNotable factorsClass
2026-05-01戊寅開奎申 Monkey建除 開 · 宿 奎 · 黃道吉
2026-05-02己卯閉婁酉 Rooster建除 閉凶
2026-05-03庚辰建胃戌 Dog建除 建 · 宿 胃 · 黃道平
2026-05-04辛巳除昴亥 Pig四絕 · 黃道凶
2026-05-05壬午除畢子 Rat黃道吉
2026-05-06癸未滿觜丑 Ox黃道吉
2026-05-07甲申平參寅 Tiger建除 平平
2026-05-08乙酉定井卯 Rabbit月德合 · 建除 定上吉
2026-05-09丙戌執鬼辰 Dragon天德合 · 建除 執 · 黃道上吉
2026-05-10丁亥破柳巳 SnakeFailed requirement: not_month_break大凶
2026-05-11戊子危星午 HorseFailed requirement: not_year_break大凶
2026-05-12己丑成張未 Goat建除 成 · 宿 張 · 黃道上吉
2026-05-13庚寅收翼申 Monkey月德吉
2026-05-14辛卯開軫酉 Rooster天德 · 建除 開上吉
2026-05-15壬辰閉角戌 Dog建除 閉 · 黃道凶
2026-05-16癸巳建亢亥 Pig建除 建 · 宿 亢凶
2026-05-17甲午除氐子 Rat宿 氐 · 黃道平
2026-05-18乙未滿房丑 Ox月德合 · 黃道吉
2026-05-19丙申平心寅 Tiger天德合 · 建除 平 · 宿 心吉
2026-05-20丁酉定尾卯 Rabbit建除 定吉
2026-05-21戊戌執箕辰 Dragon建除 執 · 宿 箕 · 黃道平
2026-05-22己亥破斗巳 SnakeFailed requirement: not_month_break大凶
2026-05-23庚子危牛午 HorseFailed requirement: not_year_break大凶
2026-05-24辛丑成女未 Goat天德 · 建除 成 · 黃道上吉
2026-05-25壬寅收虛申 Monkey宿 虛吉
2026-05-26癸卯開危酉 Rooster建除 開 · 宿 危平
2026-05-27甲辰閉室戌 Dog建除 閉 · 黃道凶
2026-05-28乙巳建壁亥 Pig月德合 · 建除 建 · 宿 壁吉
2026-05-29丙午除奎子 Rat天德合 · 宿 奎 · 黃道上吉
2026-05-30丁未滿婁丑 Ox黃道吉
2026-05-31戊申平胃寅 Tiger建除 平 · 宿 胃平
Personalised next step

BaZi-Aligned Date Report — May 2026

USD 388

A personalised PDF that re-ranks every renovation-suitable day in May 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.

What is 土王用事 and why is groundbreaking restricted then?

土王用事 are the four 18-day windows around each seasonal transition when the Earth phase is dominant. Disturbing the ground during these windows is taboo for renovation, foundation work, and excavation. The page’s hard-requirement filter excludes these days; for a personal alignment we also check your Earth-element balance.

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.