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Tong Shu Calendar Reference

Auspicious Renovation Start Dates for September 2027裝修 · September 2027

By Master Sean Chan · Updated

This month carries Bai Lu (白露) — month flips to 酉 on September 8 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in September 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 September
24
pass hard requirements
3
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-09-03戊子定 Stabilising角午 (Horse)上吉
22027-09-20乙巳成 Completing昴亥 (Pig)上吉
32027-09-10乙未開 Opening斗丑 (Ox)上吉
42027-09-25庚戌除 Removing鬼辰 (Dragon)吉
52027-09-17壬寅執 Holding奎申 (Monkey)吉

All days in September 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-09-01丙戌滿翼辰 Dragon黃道吉
2027-09-02丁亥平軫巳 Snake月德合 · 建除 平吉
2027-09-03戊子定角午 Horse天德合 · 建除 定 · 黃道上吉
2027-09-04己丑執亢未 GoatFailed requirement: not_year_break大凶
2027-09-05庚寅破氐申 MonkeyFailed requirement: not_month_break大凶
2027-09-06辛卯危房酉 Rooster建除 危凶
2027-09-07壬辰危心戌 Dog建除 危 · 宿 心平
2027-09-08癸巳成尾亥 Pig建除 成吉
2027-09-09甲午收箕子 Rat宿 箕 · 黃道平
2027-09-10乙未開斗丑 Ox月德合 · 建除 開 · 黃道上吉
2027-09-11丙申閉牛寅 Tiger建除 閉凶
2027-09-12丁酉建女卯 Rabbit建除 建 · 黃道平
2027-09-13戊戌除虛辰 Dragon宿 虛吉
2027-09-14己亥滿危巳 Snake宿 危平
2027-09-15庚子平室午 Horse月德 · 建除 平 · 黃道吉
2027-09-16辛丑定壁未 GoatFailed requirement: not_year_break大凶
2027-09-17壬寅執奎申 Monkey建除 執 · 宿 奎 · 黃道吉
2027-09-18癸卯破婁酉 RoosterFailed requirement: not_month_break大凶
2027-09-19甲辰危胃戌 Dog建除 危 · 宿 胃平
2027-09-20乙巳成昴亥 Pig月德合 · 建除 成上吉
2027-09-21丙午收畢子 Rat黃道吉
2027-09-22丁未開觜丑 Ox四離 · 建除 開 · 黃道凶
2027-09-23戊申閉參寅 Tiger建除 閉凶
2027-09-24己酉建井卯 Rabbit建除 建 · 黃道平
2027-09-25庚戌除鬼辰 Dragon月德吉
2027-09-26辛亥滿柳巳 Snake—平
2027-09-27壬子平星午 Horse建除 平 · 黃道平
2027-09-28癸丑定張未 GoatFailed requirement: not_year_break大凶
2027-09-29甲寅執翼申 Monkey建除 執 · 黃道吉
2027-09-30乙卯破軫酉 RoosterFailed requirement: not_month_break大凶
Personalised next step

BaZi-Aligned Date Report — September 2027

USD 388

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

Pillars use the 60 Jiazi day cycle anchored to the published Tong Shu. The BaZi year flips at Li Chun, the BaZi month flips at each sectional solar term — both computed from VSOP87 ephemeris data. The Twelve Officers (建除) and the 28 Mansions each have their own deterministic rotation against an authoritative anchor.

Weights come from the Dong Gong (董公擇日) school. Auspicious 神煞 add, taboo 神煞 subtract, the officer and mansion adjust, Yellow Dao adds a small bonus on top. Sum, clamp to 0–100, classify. No app shortcuts.