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Tong Shu Calendar Reference

Auspicious Renovation Start Dates for January 2026裝修 · January 2026

By Master Sean Chan · Updated

This month carries Xiao Han (小寒) — minor cold on January 5 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in January 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 January
26
pass hard requirements
3
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12026-01-08乙酉Completing卯 (Rabbit)上吉
22026-01-13庚寅Removing申 (Monkey)上吉
32026-01-28乙巳Stabilising亥 (Pig)上吉
42026-01-20丁酉Completing卯 (Rabbit)
52026-01-16癸巳Stabilising亥 (Pig)

All days in January 2026

DateDay PillarOfficerMansion ClashNotable factorsClass
2026-01-01戊寅滿申 Monkey宿 箕
2026-01-02己卯酉 Rooster建除 平 · 黃道
2026-01-03庚辰戌 Dog建除 定
2026-01-04辛巳亥 Pig建除 執
2026-01-05壬午子 Rat建除 執 · 宿 虛
2026-01-06癸未丑 OxFailed requirement: not_month_break大凶
2026-01-07甲申寅 Tiger建除 危 · 黃道
2026-01-08乙酉卯 Rabbit天德合 · 月德合 · 建除 成上吉
2026-01-09丙戌辰 Dragon宿 奎 · 黃道
2026-01-10丁亥巳 SnakeFailed requirement: not_year_break大凶
2026-01-11戊子午 Horse建除 閉 · 宿 胃
2026-01-12己丑未 Goat建除 建
2026-01-13庚寅申 Monkey天德 · 月德 · 黃道上吉
2026-01-14辛卯滿酉 Rooster黃道
2026-01-15壬辰戌 Dog建除 平
2026-01-16癸巳亥 Pig建除 定 · 黃道
2026-01-17甲午子 Rat建除 執
2026-01-18乙未丑 OxFailed requirement: not_month_break大凶
2026-01-19丙申寅 Tiger建除 危 · 黃道
2026-01-20丁酉卯 Rabbit建除 成 · 宿 張
2026-01-21戊戌辰 Dragon黃道
2026-01-22己亥巳 SnakeFailed requirement: not_year_break大凶
2026-01-23庚子午 Horse天德 · 月德 · 建除 閉
2026-01-24辛丑未 Goat建除 建 · 宿 亢
2026-01-25壬寅申 Monkey宿 氐 · 黃道
2026-01-26癸卯滿酉 Rooster黃道
2026-01-27甲辰戌 Dog建除 平 · 宿 心
2026-01-28乙巳亥 Pig天德合 · 月德合 · 建除 定上吉
2026-01-29丙午子 Rat建除 執 · 宿 箕
2026-01-30丁未丑 OxFailed requirement: not_month_break大凶
2026-01-31戊申寅 Tiger建除 危 · 黃道
Personalised next step

BaZi-Aligned Date Report — January 2026

USD 388

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

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.