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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壬申定 Stabilising心寅 (Tiger)上吉
22027-04-30壬午滿 Filling奎子 (Rat)上吉
32027-04-05丁巳除 Removing昴亥 (Pig)上吉
42027-04-26戊寅開 Opening虛申 (Monkey)上吉
52027-04-08庚申定 Stabilising參寅 (Tiger)吉

All days in April 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-04-01癸丑開壁未 GoatFailed requirement: not_year_break大凶
2027-04-02甲寅閉奎申 Monkey月德 · 建除 閉 · 宿 奎吉
2027-04-03乙卯建婁酉 Rooster建除 建 · 黃道平
2027-04-04丙辰除胃戌 Dog宿 胃吉
2027-04-05丁巳除昴亥 Pig天德合 · 月德合 · 黃道上吉
2027-04-06戊午滿畢子 Rat—平
2027-04-07己未平觜丑 Ox建除 平平
2027-04-08庚申定參寅 Tiger建除 定 · 黃道吉
2027-04-09辛酉執井卯 Rabbit建除 執 · 黃道吉
2027-04-10壬戌破鬼辰 DragonFailed requirement: not_month_break大凶
2027-04-11癸亥危柳巳 Snake建除 危 · 黃道平
2027-04-12甲子成星午 Horse建除 成吉
2027-04-13乙丑收張未 GoatFailed requirement: not_year_break大凶
2027-04-14丙寅開翼申 Monkey建除 開 · 黃道吉
2027-04-15丁卯閉軫酉 Rooster天德合 · 月德合 · 建除 閉吉
2027-04-16戊辰建角戌 Dog建除 建 · 黃道平
2027-04-17己巳除亢亥 Pig宿 亢 · 黃道平
2027-04-18庚午滿氐子 Rat宿 氐平
2027-04-19辛未平房丑 Ox建除 平平
2027-04-20壬申定心寅 Tiger天德 · 月德 · 建除 定上吉
2027-04-21癸酉執尾卯 Rabbit建除 執 · 黃道吉
2027-04-22甲戌破箕辰 DragonFailed requirement: not_month_break大凶
2027-04-23乙亥危斗巳 Snake建除 危 · 黃道平
2027-04-24丙子成牛午 Horse建除 成吉
2027-04-25丁丑收女未 GoatFailed requirement: not_year_break大凶
2027-04-26戊寅開虛申 Monkey建除 開 · 宿 虛 · 黃道上吉
2027-04-27己卯閉危酉 Rooster建除 閉 · 宿 危大凶
2027-04-28庚辰建室戌 Dog建除 建 · 黃道平
2027-04-29辛巳除壁亥 Pig宿 壁 · 黃道吉
2027-04-30壬午滿奎子 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.