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Tong Shu Calendar Reference

Auspicious Contract Signing Dates for December 2027簽約 · December 2027

By Master Sean Chan · Updated

This month carries Da Xue (大雪) — month flips to 子 on December 7 (Singapore time): the BaZi calendar's sectional boundary for the month. Winter solstice (冬至) lands within this month — the year's lowest Yang point, commonly avoided for major ceremonial events.Below is the universal Chinese metaphysics ranking of every day in December 2027 for signing a contract (立券 / 交易), derived from the classical Tong Shu (通書). Contracts are agreements meant to hold — the rules favour 定 (Stabilising), 成 (Completing), and 執 (Holding) officers.

Top-ranked dates this month

31
days in December
26
pass hard requirements
4
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12027-12-16壬申Completing寅 (Tiger)上吉
22027-12-03己未Completing丑 (Ox)上吉
32027-12-28甲申Completing寅 (Tiger)上吉
42027-12-04庚申Gathering寅 (Tiger)上吉
52027-12-12戊辰Stabilising戌 (Dog)

All days in December 2027

DateDay PillarOfficerMansion ClashNotable factorsClass
2027-12-01丁巳亥 PigFailed requirement: not_month_break大凶
2027-12-02戊午子 Rat建除 危 · 宿 箕 · 黃道
2027-12-03己未丑 Ox月德合 · 建除 成 · 宿 斗上吉
2027-12-04庚申寅 Tiger天德合 · 建除 收上吉
2027-12-05辛酉卯 Rabbit建除 開
2027-12-06壬戌辰 Dragon建除 閉 · 黃道
2027-12-07癸亥巳 Snake建除 閉 · 宿 危
2027-12-08甲子午 Horse建除 建 · 黃道
2027-12-09乙丑未 GoatFailed requirement: not_year_break大凶
2027-12-10丙寅滿申 Monkey宿 奎
2027-12-11丁卯酉 Rooster月德合 · 建除 平 · 黃道
2027-12-12戊辰戌 Dog建除 定
2027-12-13己巳亥 Pig建除 執
2027-12-14庚午子 RatFailed requirement: not_month_break大凶
2027-12-15辛未丑 Ox建除 危
2027-12-16壬申寅 Tiger月德 · 建除 成 · 黃道上吉
2027-12-17癸酉卯 Rabbit建除 收 · 宿 井 · 黃道
2027-12-18甲戌辰 Dragon建除 開
2027-12-19乙亥巳 Snake建除 閉
2027-12-20丙子午 Horse建除 建 · 黃道
2027-12-21丁丑未 GoatFailed requirement: not_year_break大凶
2027-12-22戊寅滿申 Monkey
2027-12-23己卯酉 Rooster建除 平 · 宿 軫 · 黃道
2027-12-24庚辰戌 Dog建除 定
2027-12-25辛巳亥 Pig建除 執 · 宿 亢
2027-12-26壬午子 RatFailed requirement: not_month_break大凶
2027-12-27癸未丑 Ox建除 危
2027-12-28甲申寅 Tiger建除 成 · 黃道上吉
2027-12-29乙酉卯 Rabbit建除 收 · 黃道
2027-12-30丙戌辰 Dragon建除 開 · 宿 箕
2027-12-31丁亥巳 Snake月德合 · 建除 閉 · 宿 斗
Personalised next step

BaZi-Aligned Date Report — December 2027

USD 388

A personalised PDF that re-ranks every contract signing-suitable day in December 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.

If a contract is signed on a 大凶 day, is the contract void?

Legally no — the document is binding regardless. Energetically the method holds that the agreement carries the day’s deficits (month break weakens its longevity; year break invites reversal). Choose another day if at all possible; if you can’t, the personalised report identifies the least-bad alternative.

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.