Skip to content

Zi Wei Dou Shu (Purple Star Astrology) · Major star 10 of 14

Ju Men 巨門, the star of darkness and of right and wrong

Ju Men 巨門 is the second star of the Northern Dipper in the 紫微斗數全書, three palaces ahead of Tian Fu. The text gives it the epithet darkness and reads it as speech, doubt and dispute: it sorts things in heaven and holds right and wrong in the chart.

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 Ju Men's brightness there by the 全書's seven-level table: brilliant (廟) in 寅, 卯, 申, 酉; weak or fallen in 丑, 辰, 未, 戌. The brilliant palaces are outlined, and 巨門 is written in the centre. 子 旺 strong 丑 不 weak 寅 廟 brilliant 卯 廟 brilliant 辰 陷 fallen 巳 旺 strong 午 旺 strong 未 不 weak 申 廟 brilliant 酉 廟 brilliant 戌 陷 fallen 亥 旺 strong 巨門
Ju Men'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
10 of 14, in the order of the placing verse (安南北斗諸星訣)
Characters
巨門 Jùmén; simplified 巨门
On our chart
Giant Gate; in detail, Ju Men · Giant Gate
Series and place
Tian Fu series (天府星系); three palaces ahead of Tian Fu
Element (全書)
Water and metal (水、金) in juan 1; water in the juan 2 list
Dipper seat (全書)
The second star of the Northern Dipper (北斗第二)
Epithet (化氣)
暗, darkness or obscurity
Palace it masters (全書)
None: it "governs right and wrong" (主是非)
Brilliant (廟) in
寅、卯、申、酉
Weak (不) or fallen (陷) in
丑、辰、未、戌
Transformations (common table)
化祿 in 辛 years; 化權 in 癸 years; 化忌 in 丁 years
Life or Body Master
Life Master (命主) for a Life Palace in 丑 or 亥
Our gloss
Speech, analysis and scrutiny; questions everything, may stir debate (EsoTerrier's wording)

Meaning

The 全書's dialogue begins:

巨門屬水、金。北斗第二星也,為陰精之星,化氣為暗。

In our translation: Ju Men belongs to water and metal. It is the second star of the Northern Dipper, a star of yin essence, and its epithet is darkness.

The lines under 希夷先生 give it a task in two worlds: 「在天,司品萬物。在數則掌執是非」, in heaven it sorts the ten thousand things, in the numbers it holds right and wrong. It brings a person words, doubt and argument; its nature is 「面是背非」, yes to the face and no behind the back, and it is slow to get on with kin. It needs a bright palace to be at peace: with the Sun it is half good and half bad, the emperor restrains it and 祿存 relieves it.

The 形性賦 calls it 「是非之曜」, the light of right and wrong, and gives it a kinder face in its strong palaces: 「敦厚溫良」, honest, warm and mild.

The name means "giant gate". Our chart keeps that, and our gloss reads: speech, analysis and scrutiny; questions everything, may stir debate. It is a star of the questioning mind on these pages, not of the law.

The name

巨門 is the Sui 五行大義's name for the second star of the Northern Dipper, 天璇 (Merak); the Daoist Northern Dipper scripture repeats it. The chart borrows the name and observes nothing. Chinese feng shui gives it to the number two of the nine stars, the star Nine Star Ki calls Two Black Earth.

On the board

Ju Men is three palaces ahead of Tian Fu. It shares a palace with Tian Tong in 丑 or 未, the Sun in 寅 or 申 and Tian Ji in 卯 or 酉, and stands alone in the other six. It is brilliant (廟) in 寅, 卯, 申 and 酉, weak (不) in 丑 and 未 and fallen (陷) in 辰 and 戌. In the common table it takes 化祿 in a 辛 year, 化權 in a 癸 year and 化忌 in a 丁 year. It is the Life Master (命主) when the Life Palace is in 丑 or 亥.

What this page leaves out

The dialogue goes through the twelve palaces with Ju Men and finds trouble in nearly all of them: quarrels among kin, partings, disputes and losses. 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
「巨門屬水、金。北斗第二星也,為陰精之星,化氣為暗。」 Ju Men belongs to water and metal. It is the second star of the Northern Dipper, a star of yin essence; its epithet is darkness sourced
形性賦, form and nature
「巨門乃是非之曜,在廟敦厚溫良」 Ju Men is the light of right and wrong; in its strong palaces honest, warm and mild; a sketch of a type, never a reading of anyone's body sourced
Namesake in the sky (symbolic)
天璇, the second star of the Northern Dipper (Merak, β Ursae Majoris), named 巨門 in the Sui 五行大義's quotation; the chart does not read it sourced
Dipper by series
Listed as a Southern Dipper star on some practitioner pages because it belongs to the Tian Fu series; the 全書 seats it second in the Northern Dipper disputed
Element, a modern table
Water with earth in one practitioner table disputed
English names elsewhere
Giant Gate (English Wikipedia); advocator (iztro); Great Gate and Messenger on other sites sourced
Our short name and gloss
Giant Gate: Speech, analysis and scrutiny; questions everything, may stir debate. our construction

How the schools read it

紫微斗數全書, the lines under 希夷先生
「在天,司品萬物。在數則掌執是非」: in heaven it sorts the ten thousand things, in the numbers it holds right and wrong. Its nature is 「面是背非」, yes to the face and no behind the back.
紫微斗數全書, the same lines
Half good and half bad with the Sun; the emperor restrains it and 祿存 relieves it; it needs a bright palace to be at peace.
紫微斗數全書, 形性賦
The light of right and wrong; honest, warm and mild in its strong palaces.
Three-harmony practice (三合派)
Reads it as the star of speech and scrutiny, judged by its brightness and by whether the Sun lights it.
English teaching
Giant Gate or Great Gate; one site's "Dark Gate" is not our name.
EsoTerrier
Short name Giant Gate; our gloss names speech, analysis and scrutiny, a questioning mind. No reading of outcome.

Claims about it

  • Ju Men is the second star of the Dipper, and the chart reads where it stands.

    disputed

    What the record shows: 巨門 is the Sui 五行大義's name for the second Dipper star; the chart places Ju Men by counting from Tian Fu.

  • As a star of the Tian Fu series, Ju Men belongs to the Southern Dipper.

    false

    What the record shows: The series is a placement grouping. The 全書 seats Ju Men second in the Northern Dipper.

  • The text's lines on Ju Men foretell disputes, separations and losses in each palace.

    unverified

    What the record shows: The 全書 runs through the palaces in that register. None of it is repeated here.

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. 蕭吉, 五行大義 (Sui, 581 to 618), juan 4 and 5, quoting the 黃帝斗圖 for the names of the seven Dipper stars. Chinese Wikisource. zh.wikisource.org/wiki/五行大義/4
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.

Your Zi Wei Dou Shu reading, $4.99. Includes this system's raw data. Written for you by AI. Read a sample. Charts and the written text are free in every account.

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.