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Zi Wei Dou Shu (Purple Star Astrology) · Major star 5 of 14

Tian Tong 天同, the mild star of blessing

Tian Tong 天同 is the Southern Dipper's star of blessing (福), five palaces behind Zi Wei. The 紫微斗數全書 makes it master of the Wellbeing palace and calls it modest and mild, with high aims and no violence, a blessing in all twelve palaces.

The twelve palaces of the board, 巳 午 未 申 along the top, 辰 and 卯 down the left, 酉 and 戌 down the right and 寅 丑 子 亥 along the bottom, each marked with Tian Tong's brightness there by the 全書's seven-level table: brilliant (廟) in 巳, 亥; weak or fallen in 丑, 午, 未. The brilliant palaces are outlined, and 天同 is written in the centre. 子 旺 strong 丑 不 weak 寅 利 beneficial 卯 平 neutral 辰 平 neutral 巳 廟 brilliant 午 陷 fallen 未 不 weak 申 旺 strong 酉 平 neutral 戌 平 neutral 亥 廟 brilliant 天同
Tian Tong's brightness in each of the twelve palaces, by the 全書's seven-level table: the brilliant palaces outlined, the weak and fallen ones dashed. 寅 sits at the bottom left, as charts draw the board.

Facts

Order
5 of 14, in the order of the placing verse (安南北斗諸星訣)
Characters
天同 Tiāntóng
On our chart
Harmony; in detail, Tian Tong · Heavenly Unity (Harmony)
Series and place
Zi Wei series (紫微星系); five palaces behind Zi Wei
Element (全書)
Water (水); the juan 2 list adds metal
Dipper seat (全書)
The fourth star of the Southern Dipper (南方第四星)
Epithet (化氣)
福, blessing
Palace it masters (全書)
Wellbeing (福德)
Brilliant (廟) in
巳、亥
Weak (不) or fallen (陷) in
丑、午、未
Transformations (common table)
化祿 in 丙 years; 化權 in 丁 years; 化忌 in 庚 years
Life or Body Master
Body Master (身主) for a 卯 or 酉 year
Our gloss
Easygoing, kind and comfort-loving; grows through challenge (EsoTerrier's wording)

Meaning

The 全書's dialogue begins:

天同星屬水,乃南方第四星也,為福德宮之主宰。

In our translation: Tian Tong belongs to water; it is the fourth star of the south, master of the Wellbeing palace.

Its epithet is 福, blessing, and the text is gentler with it than with almost any other star. 「十二宮中皆曰福」: in all twelve palaces it is called a blessing (the text says as much of Tian Fu and Tian Xiang). The lines under 希夷先生 call it the Southern Dipper's star that adds years and keeps life, and give a person who is modest and mild, kind, upright and literate, 「有奇志無凶激」, with unusual aims and no violence. It is not afraid of Qi Sha or the other harsh stars.

The 形性賦 draws it 「肥滿,目秀清奇」, plump and full, with fine, clear eyes: a type of its time, never a reading of anyone's body. The risk in the text's picture is softness.

Our chart calls it Harmony, and our gloss reads: easygoing, kind and comfort-loving; grows through challenge. The second half is our reading of the text's praise of difficulty met with calm, and is labelled as ours.

Not "Heavenly Virtue"

天同 means something like heavenly sameness or accord; English Wikipedia renders it Heavenly Unity. Our engine called it the Heavenly Virtue star until October 2026, but Heavenly Virtue is 天德, one of the minor stars; the gloss was replaced when the engine was rebuilt.

On the board

Tian Tong is five palaces behind Zi Wei. It shares a palace with the Moon in 子 or 午, Ju Men in 丑 or 未 and Tian Liang in 寅 or 申, and stands alone in the other six. It is brilliant (廟) in 巳 and 亥, strong in 子 and 申, weak (不) in 丑 and 未 and fallen (陷) in 午. In the common table it takes 化祿 in a 丙 year, 化權 in a 丁 year and 化忌 in a 庚 year. It is the Body Master (身主) for anyone born in a 卯 or 酉 year.

What this page leaves out

The 全書 also gives Tian Tong lines on marriage, on children and on the body when harsh stars meet it. We note the register and repeat none of it.

Correspondences

Each item with how it stands: “sourced” is in the work cited, “our construction” is EsoTerrier’s own, and “disputed” means the sources disagree.

諸星問答論, the opening line
「天同星屬水,乃南方第四星也,為福德宮之主宰。」 Tian Tong belongs to water; it is the fourth star of the south, master of the Wellbeing palace sourced
形性賦, form and nature
「天同肥滿,目秀清奇」 Tian Tong is plump and full, with fine, clear eyes; a sketch of a type, never a reading of anyone's body sourced
The name in the sky (symbolic)
The fourth lord named in the Daoist Southern Dipper scripture; which star of 斗宿 in Sagittarius bears the name is not settled, and the chart reads none sourced
Dipper by series
Listed as a Northern Dipper star on some practitioner pages because it belongs to the Zi Wei series; the 全書 seats it in the Southern Dipper disputed
化科 in a 庚 year, other tables
The northern 河洛 and 占驗 tables give Tian Tong 化科 in a 庚 year, where the common table gives it 化忌 disputed
English names elsewhere
Heavenly Unity (English Wikipedia); Harmony, Comrade and Contentment on other sites sourced
Our short name and gloss
Harmony: Easygoing, kind and comfort-loving; grows through challenge. our construction

How the schools read it

紫微斗數全書, 諸星問答論
Master of the Wellbeing palace, honest and of a fine, unusual look, "with purpose and no harshness" (有機樞無亢激); unafraid of Qi Sha or the other harsh stars. 「十二宮中皆曰福」: in all twelve palaces it is called a blessing.
紫微斗數全書, the lines under 希夷先生
The Southern Dipper's star that "adds years and keeps life"; modest and mild, kind, upright and literate, "with unusual aims and no violence" (有奇志無凶激).
紫微斗數全書, 形性賦
Plump and full, with fine, clear eyes: a sketch of a type, never a reading of anyone's body.
Northern 河洛 and 占驗 tables
Give it 化科 in a 庚 year, where the common table gives it 化忌.
English teaching
Heavenly Unity, Harmony, Comrade, Contentment; our engine's old "Heavenly Virtue" was wrong.
EsoTerrier
Short name Harmony; our gloss adds that it grows through challenge, our reading of the text's praise of difficulty met calmly. No reading of outcome.

Claims about it

  • Tian Tong is the "Heavenly Virtue" star.

    false

    What the record shows: Heavenly Virtue is 天德, a minor star. 天同 means roughly heavenly sameness, and its classical epithet is 福, blessing. Our engine's gloss said otherwise until 9 October 2026.

  • Tian Tong is a Southern Dipper star whose place in the sky the chart reads.

    disputed

    What the record shows: The name is one of the Southern Dipper scripture's six lords; which star bears it is not settled, and the chart places it by counting.

  • As a star of the Zi Wei series, Tian Tong belongs to the Northern Dipper.

    false

    What the record shows: The series is a placement grouping; the 全書 seats Tian Tong in the Southern Dipper.

  • The text's lines on Tian Tong foretell what befalls a person's marriage, children and body.

    unverified

    What the record shows: The 全書 has such lines when harsh stars meet it. We keep its picture of the mild star.

Elsewhere on EsoTerrier

Sources

Primary texts (2)
  1. 紫微斗數全書, juan 1 to 3, attributed to Chen Tuan; a Ming manual, the text labelled Qing on Wikisource, which names no source edition. Chinese Wikisource transcription; our translations. zh.wikisource.org/wiki/紫微斗數全書
  2. 太上說南斗六司延壽度人妙經, the Daoist Southern Dipper scripture. Chinese Wikisource. zh.wikisource.org/wiki/太上說南斗六司延壽度人妙經
Studies and other sources (4)
  1. SylarLong and contributors, iztro 2.6.1, an open-source Zi Wei Dou Shu library (MIT licence), our test oracle; nothing of it ships. github.com/SylarLong/iztro
  2. "Zi Wei Dou Shu", English Wikipedia (orientation and the English names). en.wikipedia.org/wiki/Zi_Wei_Dou_Shu
  3. senjutsu.jp, tables of the four transformations by school, and the calendar disputes (facts only). senjutsu.jp/labo/shibitosuu/shika-taishou
  4. A practitioner's table of the five-phase and yin-yang attributes of the major stars, 2018 (facts only). hansyuan0715.pixnet.net/blog/posts/17238043287
Our own research (2)
  1. EsoTerrier, Zi Wei Dou Shu research: the calculation, the schools, the conventions and the naming, 9 to 13 October 2026.
  2. EsoTerrier calculation engine, the Zi Wei Dou Shu service and its documentation.

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By EsoTerrier. Written with AI assistance from our research and checked against its sources; last revised 19 October 2026. How we write these pages.

First published ; last revised . Corrections: support@esoterrier.com.

Chinese quotations are from public-domain texts as transcribed on Chinese Wikisource (CC BY-SA 4.0); the translations and readings are EsoTerrier's own.