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Tong Shu Calendar Reference

Auspicious Renovation Start Dates for December 2028裝修 · December 2028

By Master Sean Chan · Updated

This month carries Da Xue (大雪) — month flips to 子 on December 6 (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 2028 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 December
26
pass hard requirements
3
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12028-12-10壬申成 Completing胃寅 (Tiger)上吉
22028-12-30壬辰定 Stabilising牛戌 (Dog)上吉
32028-12-03乙丑滿 Filling女未 (Goat)上吉
42028-12-22甲申成 Completing角寅 (Tiger)吉
52028-12-02甲子除 Removing牛午 (Horse)吉

All days in December 2028

DateDay PillarOfficerMansion ClashNotable factorsClass
2028-12-01癸亥建斗巳 Snake建除 建 · 黃道平
2028-12-02甲子除牛午 Horse月德吉
2028-12-03乙丑滿女未 Goat天德 · 黃道上吉
2028-12-04丙寅平虛申 MonkeyFailed requirement: not_year_break大凶
2028-12-05丁卯定危酉 Rooster建除 定 · 宿 危平
2028-12-06戊辰定室戌 Dog建除 定吉
2028-12-07己巳執壁亥 Pig建除 執 · 宿 壁吉
2028-12-08庚午破奎子 RatFailed requirement: not_month_break大凶
2028-12-09辛未危婁丑 Ox建除 危凶
2028-12-10壬申成胃寅 Tiger月德 · 建除 成 · 宿 胃上吉
2028-12-11癸酉收昴卯 Rabbit黃道吉
2028-12-12甲戌開畢辰 Dragon建除 開吉
2028-12-13乙亥閉觜巳 Snake建除 閉凶
2028-12-14丙子建參午 Horse建除 建 · 黃道平
2028-12-15丁丑除井未 Goat月德合 · 黃道吉
2028-12-16戊寅滿鬼申 MonkeyFailed requirement: not_year_break大凶
2028-12-17己卯平柳酉 Rooster建除 平 · 黃道平
2028-12-18庚辰定星戌 Dog建除 定吉
2028-12-19辛巳執張亥 Pig建除 執 · 宿 張吉
2028-12-20壬午破翼子 RatFailed requirement: not_month_break大凶
2028-12-21癸未危軫丑 Ox建除 危凶
2028-12-22甲申成角寅 Tiger建除 成 · 黃道吉
2028-12-23乙酉收亢卯 Rabbit宿 亢 · 黃道平
2028-12-24丙戌開氐辰 Dragon建除 開 · 宿 氐平
2028-12-25丁亥閉房巳 Snake月德合 · 建除 閉平
2028-12-26戊子建心午 Horse建除 建 · 宿 心 · 黃道平
2028-12-27己丑除尾未 Goat黃道吉
2028-12-28庚寅滿箕申 MonkeyFailed requirement: not_year_break大凶
2028-12-29辛卯平斗酉 Rooster建除 平 · 黃道平
2028-12-30壬辰定牛戌 Dog月德 · 建除 定上吉
2028-12-31癸巳執女亥 Pig建除 執吉
Personalised next step

BaZi-Aligned Date Report — December 2028

USD 388

A personalised PDF that re-ranks every renovation-suitable day in December 2028 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.