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I Ching Birth Hexagram · Hexagram 16 of 64

Hexagram 16, 豫 Yù: thunder breaking out of the ground

豫 Yù is hexagram 16 of the Zhouyi, which sets thunder over earth: the spring storm breaking out of the ground, stored energy released. The character means delight and also readiness or foresight, and the tradition reads the hexagram as enthusiasm that moves others, with a warning in its lines against pleasure for its own sake.

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Hexagram 16, 豫 Yù, drawn as six lines numbered from the bottom: broken, broken, broken, whole, broken, broken. The lower, inner trigram is 坤 Kūn, Earth; the upper, outer trigram is 震 Zhèn, Thunder. 1 2 3 4 5 6 Upper, outer 震 Zhèn, Thunder Lower, inner 坤 Kūn, Earth 16 豫 Yù Lines numbered from the bottom
The figure of 豫 from the bottom line up: Earth inside, Thunder outside. Five broken lines, one whole.

Facts

Number
16 of 64, in the received order
Character and pinyin
豫 Yù ䷏
Our title
Readiness
Lines, bottom to top
yin, yin, yin, yang, yin, yin
Lower trigram (inner)
☷ 坤 Kūn, Earth
Upper trigram (outer)
☳ 震 Zhèn, Thunder
Within (nuclear)
39 蹇 Jiǎn, Obstruction
King Wen pair
15 謙 Qiān, Modesty
Legge's name (1882)
Yü
Part of the text
The first part (上經), 1 to 30

Meaning

The ground opens and thunder breaks out of it: the trigram of movement over the trigram of yielding. The single whole line stands in the fourth place, and the five broken lines are read as responding to it, as a crowd follows the one who stirs it. 豫 means delight, and also to be ready or to foresee, and the Judgment gives the political reading: a time when leaders can be appointed and hosts set moving, because people are willing.

The Image ties the hexagram to music. Thunder issues from the earth, and the ancient kings made music to honour virtue and offered it to God and to their ancestors; shared feeling is what moves people together. In our own reading 豫 is the energy of something that has been waiting and is now released, and the tradition values it when it carries others along and mistrusts it when it becomes indulgence.

The lines

Most of the lines are warnings. The first proclaims its own pleasure and the text marks it with evil; the third looks upward for favours while it enjoys itself, and regret comes if it understands too late. Against them stands the second, "firm as a rock", in Legge's English, which sees a thing before it has come about. The fourth is the source of the delight, told to keep suspicion out of its mind so that friends gather; the top line is a mind darkened by pleasure, which can still change course.

Its pair is 謙, hexagram 15; within 豫 lies 蹇, hexagram 39, and every line flipped gives 小畜, hexagram 9.

In the birth cast

The time cast arrives at 豫 when the year, month and day leave 4 on eight, which puts 震 thunder above, and the same total with the hour added leaves 0, counted as 8, which puts 坤 earth 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 (初六) moving: becomes 51 震 Zhèn, Shock
  • Line 2 (六二) moving: becomes 40 解 Xiè, Release
  • Line 3 (六三) moving: becomes 62 小過 Xiǎo Guò, Small Excess
  • Line 4 (九四) moving: becomes 2 坤 Kūn, Earth's Yielding
  • Line 5 (六五) moving: becomes 45 萃 Cuì, Gathering
  • Line 6 (上六) moving: becomes 35 晉 Jìn, Advance

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)
坤 yielding, compliant below; 震 moving, startling above, in our English sourced
Trigram family places (Shuogua)
mother below, eldest son above sourced
Trigram body and animal images (Shuogua)
belly and ox below; feet and dragon above sourced
Trigram phases (a classical correspondence: the Plum Blossom text's table)
Earth below, Wood above. 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: 15 謙 Qiān, Modesty; every line flipped: 9 小畜 Xiǎo Xù, Small Restraint sourced
Human Design gate
Gate 16, from 65.75° to 71.375° of the tropical zodiac on Ra Uru Hu's wheel (1987): a modern placing, not the I Ching's sourced
Our English title
Readiness: EsoTerrier's own, from the sense of 豫 our construction

How the schools read it

The Zhouyi, in Legge's translation (1882)
“Yü indicates that, (in the state which it implies), feudal princes may be set up, and the hosts put in motion, with advantage.”
The Image (大象), one of the Wings, in our paraphrase
Thunder issuing from the earth; the ancient kings composed music, honoured virtue and offered it to God and their ancestors.
The Plum Blossom method (Ming)
A figure reached by numbers: 震 above when the year, month and day leave 4 on eight, 坤 below when the same total with the hour leaves 0.
Human Design (Ra Uru Hu, 1987)
Takes the number for its gate 16 and puts it on the zodiac; its own reading, which we do not quote.
EsoTerrier
Thunder bursting out of the earth: a stir of delight that moves others to move with it, honoured as music and offering, and mistrusted when it is trumpeted or chased.

Claims about it

  • Gate 16 of Human Design, at 65.75° to 71.375° of the zodiac, is where the I Ching itself places hexagram 16.

    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 豫 Yù 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.