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Tong Shu Calendar Reference

Auspicious Renovation Start Dates for August 2027裝修 · August 2027

By Master Sean Chan · Updated

This month carries Li Qiu (立秋) — start of the BaZi autumn on August 8 (Singapore time): the BaZi calendar's sectional boundary for the month. Autumn proper begins with this term; Wood-day rankings tend to weaken from this point.Below is the universal Chinese metaphysics ranking of every day in August 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

31
days in August
27
pass hard requirements
5
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-08-14戊辰Completing戌 (Dog)上吉
22027-08-28壬午Opening子 (Rat)上吉
32027-08-19癸酉Removing卯 (Rabbit)上吉
42027-08-22丙子Stabilising午 (Horse)上吉
52027-08-10甲子Stabilising午 (Horse)上吉

All days in August 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-08-01乙卯酉 Rooster建除 成 · 黃道
2027-08-02丙辰戌 Dog
2027-08-03丁巳亥 Pig建除 開 · 宿 張 · 黃道
2027-08-04戊午子 Rat建除 閉
2027-08-05己未丑 Ox天德合 · 月德合 · 建除 建
2027-08-06庚申寅 Tiger黃道
2027-08-07辛酉卯 Rabbit四絕 · 宿 亢大凶
2027-08-08壬戌滿辰 Dragon月德 · 宿 氐 · 黃道
2027-08-09癸亥巳 Snake天德 · 建除 平
2027-08-10甲子午 Horse建除 定 · 宿 心 · 黃道上吉
2027-08-11乙丑未 GoatFailed requirement: not_year_break大凶
2027-08-12丙寅申 MonkeyFailed requirement: not_month_break大凶
2027-08-13丁卯酉 Rooster月德合 · 建除 危
2027-08-14戊辰戌 Dog天德合 · 建除 成 · 黃道上吉
2027-08-15己巳亥 Pig黃道
2027-08-16庚午子 Rat建除 開 · 宿 虛
2027-08-17辛未丑 Ox建除 閉 · 宿 危 · 黃道
2027-08-18壬申寅 Tiger月德 · 建除 建
2027-08-19癸酉卯 Rabbit天德 · 宿 壁上吉
2027-08-20甲戌滿辰 Dragon宿 奎 · 黃道
2027-08-21乙亥巳 Snake建除 平
2027-08-22丙子午 Horse建除 定 · 宿 胃 · 黃道上吉
2027-08-23丁丑未 GoatFailed requirement: not_year_break大凶
2027-08-24戊寅申 MonkeyFailed requirement: not_month_break大凶
2027-08-25己卯酉 Rooster建除 危
2027-08-26庚辰戌 Dog建除 成 · 黃道
2027-08-27辛巳亥 Pig黃道
2027-08-28壬午子 Rat月德 · 建除 開上吉
2027-08-29癸未丑 Ox天德 · 建除 閉 · 黃道
2027-08-30甲申寅 Tiger建除 建
2027-08-31乙酉卯 Rabbit宿 張
Personalised next step

BaZi-Aligned Date Report — August 2027

USD 388

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