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Zi Wei Dou Shu (Purple Star Astrology) · Major star 2 of 14

Tian Ji 天機, the kindly star of plans and quick wits

Tian Ji 天機 is the second star of the Zi Wei series, always one palace behind Zi Wei. The 紫微斗數全書 calls it the third star of the Southern Dipper and the kindly star that adds to one's years, and reads it as quick, adaptable wits with a plan for every task.

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 Ji's brightness there by the 全書's seven-level table: brilliant (廟) in 子, 午; weak or fallen in 丑, 未. The brilliant palaces are outlined, and 天機 is written in the centre. 子 廟 brilliant 丑 陷 fallen 寅 得 gaining 卯 旺 strong 辰 利 beneficial 巳 平 neutral 午 廟 brilliant 未 陷 fallen 申 得 gaining 酉 旺 strong 戌 利 beneficial 亥 平 neutral 天機
Tian Ji'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
2 of 14, in the order of the placing verse (安南北斗諸星訣)
Characters
天機 Tiānjī; simplified 天机
On our chart
Strategist; in detail, Tian Ji · Heavenly Mechanism (Strategist)
Series and place
Zi Wei series (紫微星系); one palace behind Zi Wei
Element (全書)
Wood (木)
Dipper seat (全書)
The third star of the Southern Dipper (南斗第三)
Epithet (化氣)
善, goodness
Palace it masters (全書)
Siblings (兄弟)
Brilliant (廟) in
子、午
Weak (不) or fallen (陷) in
丑、未
Transformations (common table)
化祿 in 乙 years; 化權 in 丙 years; 化科 in 丁 years; 化忌 in 戊 years
Life or Body Master
Body Master (身主) for a 巳 or 亥 year
Our gloss
Quick thinking, planning and adaptability; can be restless (EsoTerrier's wording)

Meaning

The 全書's dialogue begins:

天機屬木,南斗第三益算之善星也。

In our translation: Tian Ji belongs to wood; it is the third star of the Southern Dipper, the kindly star that adds to the count of one's years.

Its epithet is 善, goodness, and the text draws it as the planner of the court. It carries out the emperor's orders and untangles what the other stars set in motion; in a person it gives 「靈機應變之志」, the will to meet change with quick wits, and 「作事有方」, a method in everything. It likes devotion, kin and quiet places, and with Tian Liang it points to a craft or a skill. Its other side in the text is restlessness: it is tied to change wherever a decade meets it.

The 形性賦 gives it 「不長不短之姿,情懷好善」: neither tall nor short, with a heart inclined to goodness. That is the verse's sketch of a type and never a reading of anyone's body.

Our chart calls it the Strategist, and our gloss reads: quick thinking, planning and adaptability; can be restless. The cost is the text's own; the words are ours.

On the board

Tian Ji is always one palace behind Zi Wei, counted against the order of the branches. It shares a palace with the Moon in 寅 or 申, with Ju Men in 卯 or 酉 and with Tian Liang in 辰 or 戌, and stands alone in the other six branches.

It is brilliant (廟) in 子 and 午 and fallen (陷) in 丑 and 未; gaining in 寅 and 申, strong in 卯 and 酉, beneficial in 辰 and 戌, neutral in 巳 and 亥. It takes all four transformations in turn in the common table: 化祿 in a 乙 year, 化權 in a 丙 year, 化科 in a 丁 year and 化忌 in a 戊 year. It is the Body Master (身主) for anyone born in a 巳 or 亥 year.

What this page leaves out

The 全書 also links Tian Ji, in some company, to the lives of monks and Daoists, to a person's kin and to the body. We record the register and repeat none of its pronouncements.

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
「天機屬木,南斗第三益算之善星也。」 Tian Ji belongs to wood: the third star of the Southern Dipper, the kindly star that adds to the count of one's years sourced
形性賦, form and nature
「天機為不長不短之姿,情懷好善」 Tian Ji is neither tall nor short, with a heart inclined to goodness; a sketch of a type, never a reading of anyone's body sourced
The name in the sky (symbolic)
The sixth 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
English names elsewhere
Heavenly Secret (English Wikipedia); advisor (iztro); Heavenly Mechanism and Strategist on other sites sourced
Our short name and gloss
Strategist: Quick thinking, planning and adaptability; can be restless. our construction

How the schools read it

紫微斗數全書, 諸星問答論
Carries out the emperor's orders and untangles what the other stars set moving; gives "the will to meet change with quick wits" (有靈機應變之志) and a method in everything. Likes devotion, kin and quiet places; with Tian Liang it points to a craft.
紫微斗數全書, 形性賦
Neither tall nor short, with a heart inclined to goodness; a sketch of a type, never a reading of anyone's body.
紫微斗數全書, the song
Calls it the master of the Siblings palace that "acts with plan and strategy" (作事有操略), and ties it to change when a decade meets it.
Three-harmony practice (三合派)
Reads it with the Moon, Tian Tong and Tian Liang, the group the 全書 itself names 機月同梁.
English teaching
Names range from Heavenly Secret and Heavenly Mechanism to Strategist, Advisor and Intelligence.
EsoTerrier
Short name Strategist; our gloss names quick thinking and planning with restlessness as their cost. No reading of outcome.

Claims about it

  • Tian Ji is a star of the Southern Dipper, and the chart reads where it stands.

    disputed

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

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

    false

    What the record shows: The series is a placement grouping. The 全書 puts Tian Ji in the Southern Dipper.

  • The text's lines on Tian Ji foretell what befalls a person.

    unverified

    What the record shows: The 全書 speaks that way in places. We keep its picture of the planner.

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 (3)
  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. 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.