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Tong Shu Calendar Reference

Auspicious Renovation Start Dates for July 2027裝修 · July 2027

By Master Sean Chan · Updated

This month carries Xiao Shu (小暑) — month flips to 未 on July 7 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in July 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 July
27
pass hard requirements
5
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-07-16己亥定 Stabilising斗巳 (Snake)上吉
22027-07-21甲辰收 Gathering室戌 (Dog)上吉
32027-07-03丙戌定 Stabilising鬼辰 (Dragon)上吉
42027-07-26己酉滿 Filling昴卯 (Rabbit)上吉
52027-07-31甲寅危 Dangerous鬼申 (Monkey)上吉

All days in July 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-07-01甲申滿參寅 Tiger黃道吉
2027-07-02乙酉平井卯 Rabbit建除 平 · 黃道平
2027-07-03丙戌定鬼辰 Dragon月德 · 建除 定上吉
2027-07-04丁亥執柳巳 Snake建除 執吉
2027-07-05戊子破星午 HorseFailed requirement: not_month_break大凶
2027-07-06己丑危張未 GoatFailed requirement: not_year_break大凶
2027-07-07庚寅危翼申 Monkey建除 危 · 黃道平
2027-07-08辛卯成軫酉 Rooster建除 成 · 黃道吉
2027-07-09壬辰收角戌 Dog—平
2027-07-10癸巳開亢亥 Pig建除 開 · 宿 亢 · 黃道吉
2027-07-11甲午閉氐子 Rat天德 · 月德 · 建除 閉吉
2027-07-12乙未建房丑 Ox建除 建平
2027-07-13丙申除心寅 Tiger宿 心 · 黃道吉
2027-07-14丁酉滿尾卯 Rabbit—平
2027-07-15戊戌平箕辰 Dragon建除 平 · 宿 箕 · 黃道凶
2027-07-16己亥定斗巳 Snake天德合 · 月德合 · 建除 定上吉
2027-07-17庚子執牛午 Horse建除 執吉
2027-07-18辛丑破女未 GoatFailed requirement: not_month_break, not_year_break大凶
2027-07-19壬寅危虛申 Monkey建除 危 · 宿 虛 · 黃道平
2027-07-20癸卯成危酉 Rooster建除 成 · 宿 危 · 黃道吉
2027-07-21甲辰收室戌 Dog天德 · 月德上吉
2027-07-22乙巳開壁亥 Pig建除 開 · 宿 壁 · 黃道吉
2027-07-23丙午閉奎子 Rat建除 閉 · 宿 奎凶
2027-07-24丁未建婁丑 Ox建除 建平
2027-07-25戊申除胃寅 Tiger宿 胃 · 黃道吉
2027-07-26己酉滿昴卯 Rabbit天德合 · 月德合上吉
2027-07-27庚戌平畢辰 Dragon建除 平 · 黃道平
2027-07-28辛亥定觜巳 Snake建除 定 · 黃道吉
2027-07-29壬子執參午 Horse建除 執吉
2027-07-30癸丑破井未 GoatFailed requirement: not_month_break, not_year_break大凶
2027-07-31甲寅危鬼申 Monkey天德 · 月德 · 建除 危上吉
Personalised next step

BaZi-Aligned Date Report — July 2027

USD 388

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