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I Ching Birth Hexagram · Hexagram 51 of 64

Hexagram 51, 震 Zhèn: thunder upon thunder

震 Zhèn is the thunder trigram doubled: in each half one whole line pushes up under two broken ones. The character means to shake or quake, and the tradition reads the hexagram as a shock that frightens and then passes; its Judgment has the one in charge of the rite keep hold of the ladle.

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Hexagram 51, 震 Zhèn, drawn as six lines numbered from the bottom: whole, broken, broken, whole, broken, broken. The lower, inner trigram is 震 Zhèn, Thunder; the upper, outer trigram is 震 Zhèn, Thunder. 1 2 3 4 5 6 Upper, outer 震 Zhèn, Thunder Lower, inner 震 Zhèn, Thunder 51 震 Zhèn Lines numbered from the bottom
The figure of 震 from the bottom line up: Thunder inside, Thunder outside. Four broken lines, two whole.

Facts

Number
51 of 64, in the received order
Character and pinyin
震 Zhèn ䷲
Our title
Shock
Lines, bottom to top
yang, yin, yin, yang, yin, yin
Lower trigram (inner)
☳ 震 Zhèn, Thunder
Upper trigram (outer)
☳ 震 Zhèn, Thunder
Within (nuclear)
39 蹇 Jiǎn, Obstruction
King Wen pair
52 艮 Gèn, Stopping
Legge's name (1882)
Kăn
Part of the text
The second part (下經), 31 to 64

Meaning

Thunder twice over, the eldest son doubled: movement bursting up from below in both halves of the figure. 震 means to shake, to quake, to startle, and the hexagram is the shock itself. Legge's romanisation, Kăn, loses in plain text the mark that tells it from his name for the next hexagram, so the two look identical without the Chinese. The Judgment begins with ease and development and then gives the scene: when the thunder comes there is fear, then laughter, and the shock that frightens everyone for a hundred miles does not make the one at the sacrifice drop the ladle.

The Image reads the repeated thunder as a reason for watchfulness: the superior man, alarmed, puts his conduct in order and examines his faults. In our own reading, 震 is about composure under shock, and about using fear to look at oneself rather than to run.

The lines

The first line is the Judgment in small: apprehension first, then smiling and cheerful talk. The second, in danger, lets go of its possessions and climbs a high place, and is told not to chase them, for they return in seven days. The third is distraught and is told to let the shock move it to act; the fourth sinks "supinely" into the mud, in Legge's English. The fifth goes back and forth in danger and loses nothing; the top line trembles and looks about, and is told to stay still before the shock reaches it.

Its pair is 艮, hexagram 52, the same figure upside down; within 震 lies 蹇, hexagram 39, and every line flipped gives 巽, hexagram 57.

In the birth cast

The time cast arrives at 震 when the year, month and day leave 4 on eight, which puts 震 thunder above, and the same total with the hour added leaves 4, which puts 震 thunder below. Which line moves depends on what the whole total leaves on six, and each line turns the figure into a different hexagram:

  • Line 1 (初九) moving: becomes 16 豫 Yù, Readiness
  • Line 2 (六二) moving: becomes 54 歸妹 Guī Mèi, The Younger Sister Weds
  • Line 3 (六三) moving: becomes 55 豐 Fēng, Fullness
  • Line 4 (九四) moving: becomes 24 復 Fù, Return
  • Line 5 (六五) moving: becomes 17 隨 Suí, Following
  • Line 6 (上六) moving: becomes 21 噬嗑 Shì Kè, Closing the Jaws

Lines 2 to 5 give the hexagram within, 39 蹇 Jiǎn, Obstruction. Everyone born in the same lunar day and double hour has the same cast, so the figure describes a moment, not a person.

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.

Trigram virtues (Shuogua, chapter 7)
震 moving, startling, doubled, in our English sourced
Trigram family places (Shuogua)
eldest son, doubled sourced
Trigram body and animal images (Shuogua)
feet and dragon, doubled sourced
Trigram phases (a classical correspondence: the Plum Blossom text's table)
Wood, doubled. The Han assignment of 梅花易數, book 1, also used by Jing Fang; not stated as such in the Zhouyi sourced
Inverse and opposite
Upside down: 52 艮 Gèn, Stopping; every line flipped: 57 巽 Xùn, Entering Wind sourced
Human Design gate
Gate 51, from 15.125° to 20.75° of the tropical zodiac on Ra Uru Hu's wheel (1987): a modern placing, not the I Ching's sourced
Our English title
Shock: EsoTerrier's own, from the sense of 震 our construction

How the schools read it

The Zhouyi, in Legge's translation (1882)
“Kăn gives the intimation of ease and development.”
The Image (大象), one of the Wings, in our paraphrase
Thunder repeated; the superior man is fearful and apprehensive, cultivates his virtue and examines his faults.
The Plum Blossom method (Ming)
A figure reached by numbers: 震 above when the year, month and day leave 4 on eight, 震 below when the same total with the hour leaves 4.
Human Design (Ra Uru Hu, 1987)
Takes the number for its gate 51 and puts it on the zodiac; its own reading, which we do not quote.
EsoTerrier
Thunder doubled: the shock that frightens and then clears the air; fear first and laughter after, and the one who keeps hold of the ladle steadies the rest.

Claims about it

  • Gate 51 of Human Design, at 15.125° to 20.75° of the zodiac, is where the I Ching itself places hexagram 51.

    false

    What the record shows: The wheel is Shao Yong's circle rotated by Ra Uru Hu in 1987 to 1989 so that hexagram 41 starts at 2° Aquarius. No Chinese source we found puts the hexagrams on degrees of the zodiac.

  • Being born under 震 Zhèn fixes a person's character.

    unverified

    What the record shows: A modern reading with no source in the tradition. The Zhouyi has no birth hexagram; the cast reads a figure, not a person, and everyone born in the same lunar day and double hour shares it.

Elsewhere on EsoTerrier

Sources

Primary texts (6)
  1. James Legge (trans.), The Yî King, Sacred Books of the East XVI. Oxford: Clarendon Press, 1882. Public domain; quoted briefly and credited. en.wikisource.org/wiki/Sacred_Books_of_the_East/Volume_16
  2. 梅花易數 (Meihua yishu, the Plum Blossom method), attributed to Shao Yong, book 1: the time rule, the trigram numbers and phases, and the casts of the plum blossom and the peonies. zh.wikisource.org/wiki/梅花易數/卷一
  3. 周易 (Zhouyi), the received Chinese text of the hexagram and line statements with the Ten Wings. ctext.org/book-of-changes
  4. The same, the 1882 Oxford edition scanned (archive.org), for hexagrams 33 to 64 and the appendices. archive.org/details/sacredbooksofchi16conf
  5. The Unicode Standard, Yijing Hexagram Symbols, U+4DC0 to U+4DFF. unicode.org/charts/PDF/U4DC0.pdf
  6. 京氏易傳 (Jingshi yizhuan), attributed to Jing Fang, three books. zh.wikisource.org/wiki/京氏易傳
Studies and other sources (3)
  1. "King Wen sequence", Wikipedia. en.wikipedia.org/wiki/King_Wen_sequence
  2. Jovian Archive, "Gates and hexagrams in Human Design" (cited for the wheel's origin only). jovianarchive.com/pages/gates-and-hexagrams-in-human-design
  3. "Hexagram (I Ching)", Wikipedia. en.wikipedia.org/wiki/Hexagram_(I_Ching)
Our own research (5)
  1. EsoTerrier, I Ching research, 10 to 14 October 2026: the method, the validation (61 births), the variants and the lists.
  2. EsoTerrier calculation engine, the I Ching service and its reference tables (titles, glosses and readings our own).
  3. EsoTerrier, Gene Keys research, 9 October 2026: the legal and trade-mark report, on which hexagram names are free to use.
  4. EsoTerrier, Human Design research, 9 October 2026: the wheel, gate 41 at 2° Aquarius, 5.625° per gate.
  5. EsoTerrier, engine audit of 14 October 2026: the reworded titles, readings and trigram qualities, with the passages each rests on.

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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.