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Tong Shu Calendar Reference

Auspicious Renovation Start Dates for August 2026裝修 · August 2026

By Master Sean Chan · Updated

This month carries Li Qiu (立秋) — start of the BaZi autumn on August 7 (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 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 August
25
pass hard requirements
3
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12026-08-19戊辰成 Completing室戌 (Dog)上吉
22026-08-05甲寅危 Dangerous翼申 (Monkey)上吉
32026-08-28丁丑執 Holding井未 (Goat)上吉
42026-08-24癸酉除 Removing昴卯 (Rabbit)吉
52026-08-07丙辰成 Completing角戌 (Dog)吉

All days in August 2026

DateDay PillarOfficerMansion ClashNotable factorsClass
2026-08-01庚戌平鬼辰 Dragon建除 平 · 黃道平
2026-08-02辛亥定柳巳 Snake建除 定 · 黃道吉
2026-08-03壬子執星午 HorseFailed requirement: not_year_break大凶
2026-08-04癸丑破張未 GoatFailed requirement: not_month_break大凶
2026-08-05甲寅危翼申 Monkey天德 · 月德 · 建除 危上吉
2026-08-06乙卯成軫酉 Rooster四絕 · 建除 成 · 黃道平
2026-08-07丙辰成角戌 Dog建除 成 · 黃道吉
2026-08-08丁巳收亢亥 Pig月德合 · 宿 亢 · 黃道吉
2026-08-09戊午開氐子 Rat天德合 · 建除 開 · 宿 氐吉
2026-08-10己未閉房丑 Ox建除 閉 · 黃道凶
2026-08-11庚申建心寅 Tiger建除 建 · 宿 心平
2026-08-12辛酉除尾卯 Rabbit—平
2026-08-13壬戌滿箕辰 Dragon月德 · 宿 箕 · 黃道吉
2026-08-14癸亥平斗巳 Snake天德 · 建除 平吉
2026-08-15甲子定牛午 HorseFailed requirement: not_year_break大凶
2026-08-16乙丑執女未 Goat建除 執 · 黃道吉
2026-08-17丙寅破虛申 MonkeyFailed requirement: not_month_break大凶
2026-08-18丁卯危危酉 Rooster月德合 · 建除 危 · 宿 危凶
2026-08-19戊辰成室戌 Dog天德合 · 建除 成 · 黃道上吉
2026-08-20己巳收壁亥 Pig宿 壁 · 黃道吉
2026-08-21庚午開奎子 Rat建除 開 · 宿 奎吉
2026-08-22辛未閉婁丑 Ox建除 閉 · 黃道凶
2026-08-23壬申建胃寅 Tiger月德 · 建除 建 · 宿 胃吉
2026-08-24癸酉除昴卯 Rabbit天德吉
2026-08-25甲戌滿畢辰 Dragon黃道吉
2026-08-26乙亥平觜巳 Snake建除 平平
2026-08-27丙子定參午 HorseFailed requirement: not_year_break大凶
2026-08-28丁丑執井未 Goat月德合 · 建除 執 · 黃道上吉
2026-08-29戊寅破鬼申 MonkeyFailed requirement: not_month_break大凶
2026-08-30己卯危柳酉 Rooster建除 危凶
2026-08-31庚辰成星戌 Dog建除 成 · 黃道吉
Personalised next step

BaZi-Aligned Date Report — August 2026

USD 388

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