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Tong Shu Calendar Reference

Auspicious Renovation Start Dates for April 2027裝修 · 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 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

30
days in April
25
pass hard requirements
4
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
42027-04-26戊寅Opening申 (Monkey)上吉
52027-04-08庚申Stabilising寅 (Tiger)

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 · 宿 奎
2027-04-03乙卯酉 Rooster建除 建 · 黃道
2027-04-04丙辰戌 Dog宿 胃
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建除 執 · 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
2027-04-20壬申寅 Tiger天德 · 月德 · 建除 定上吉
2027-04-21癸酉卯 Rabbit建除 執 · 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 · 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 · 宿 虛 · 黃道上吉
2027-04-27己卯酉 Rooster建除 閉 · 宿 危大凶
2027-04-28庚辰戌 Dog建除 建 · 黃道
2027-04-29辛巳亥 Pig宿 壁 · 黃道
2027-04-30壬午滿子 Rat天德 · 月德 · 宿 奎上吉
Personalised next step

BaZi-Aligned Date Report — April 2027

USD 388

A personalised PDF that re-ranks every renovation-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.

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

Each day’s pillar is computed from the 60 Jiazi rotation anchored against the published Tong Shu, not from any single calendar app. The BaZi year flips at Li Chun (立春) and the BaZi month flips at every sectional solar term, both calculated from VSOP87 solar-longitude data so the boundaries land on the right minute. Twelve Officers and the 28 Mansions each rotate deterministically against well-known anchors.

The per-purpose weights are Dong Gong’s (董公擇日) — adjusted where modern almanacs disagree, in favour of the Hong Kong Observatory and Taiwan CWB lineage. Auspicious stars add to the score, taboo stars subtract, the day’s officer and mansion shift it further, and Yellow Dao adds a final small bonus. The final number gets capped at 100 and mapped to one of five tiers.