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I Ching Line Notation 6 7 8 9: Yin, Yang, and Moving Lines

Learn I Ching line notation 6 7 8 9: map each cast number to a solid or broken yin-yang line, spot moving lines, and build both hexagrams from the bottom up.

IntentInformational
UpdatedAug 4, 2026
Read8 min read

Answer First

A cast of 6, 7, 8, or 9 is I Ching line notation 6 7 8 9: odd numbers become solid yang lines, even numbers become broken yin lines, and 6 and 9 are moving lines that change into their opposite. Build the hexagram from the bottom line upward, then draw the changed hexagram before you read the commentary.

Definition: I Ching line notation 6 7 8 9 is the compact code that records the outcome of every cast: 6 is old yin, 7 is young yang, 8 is young yin, and 9 is old yang.

Why: Each number carries two separate pieces of information — polarity (yin or yang) and energy (stable or moving). The moving lines, 6 and 9, create the changed hexagram and mark where a reading concentrates its attention.

Example: Six casts of 8, 7, 6, 8, 9, 7 draw the primary hexagram from bottom to top as broken, solid, broken, broken, solid, solid — Dispersion (hexagram 59). The third cast (6) and the fifth cast (9) are moving, so flipping them yields the changed hexagram solid, solid, solid, broken, broken, solid, which is Great Accumulation (hexagram 26).

Key Facts

I Ching line notation 6 7 8 9 covers every outcome a single cast can produce in the classic methods, and the rules below turn those numbers into the drawing you interpret.

NumberParityLine drawnNameStatusChanges to
6evenbroken (yin)old yinmovingsolid (yang)
7oddsolid (yang)young yangstablesolid (unchanged)
8evenbroken (yin)young yinstablebroken (unchanged)
9oddsolid (yang)old yangmovingbroken (yin)
  • Odd numbers (7, 9) draw solid yang lines; even numbers (6, 8) draw broken yin lines.
  • “Young” lines (7, 8) are stable; “old” lines (6, 9) are moving and flip in the changed hexagram.
  • The first cast is line 1, at the bottom; the sixth cast is line 6, at the top.
  • Lines 1–3 form the lower trigram; lines 4–6 form the upper trigram.
  • The three-coin method and the yarrow-stalk method produce the same four numbers but at different rates, which is why probability analysis and method equivalence are still discussed (Clarke, 1987; Hacker, 1980).
  • These readings are culturally meaningful but are not validated by scientific testing as reliable forecasts.

Expert Explanation

Where the numbers come from. In the three-coin method, you assign a value of 2 to one side and 3 to the other, toss three coins, and add the results. Only four sums are possible: 6 (2+2+2), 7 (2+2+3), 8 (2+3+3), and 9 (3+3+3). The traditional yarrow-stalk method, which divides and counts 49 stalks, reaches the same four numbers through a longer procedure. Because the two methods do not produce the four numbers equally often, this is where I Ching line notation 6 7 8 9 becomes a topic of scholarship: A. G. Clarke devoted a paper to probability theory applied to the I Ching (1987), while Edward A. Hacker proposed a coin procedure designed as an equivalent to the yarrow-stalk method in a brief note published in Philosophy East and West (1980). To weigh the practical trade-offs yourself, see our article on I Ching coins vs yarrow stalks: methods and timing.

What “moving” means. The tradition names the numbers 6, 7, 8, and 9 by age and polarity: 6 is old yin (老阴, lǎo yīn), 7 is young yang (少阳, shào yáng), 8 is young yin (少阴, shào yīn), and 9 is old yang (老阳, lǎo yáng). An “old” line has reached maturity and moves into its opposite; a “young” line stays as drawn. This is the heart of the system’s idea of change, a theme surveyed in the Stanford Encyclopedia of Philosophy’s entry on the Chinese philosophy of change (2023).

Why lines build from the bottom. Each hexagram is drawn with the first cast at the bottom. Lines 1–3 make the lower trigram and lines 4–6 make the upper trigram, and English readers typically meet these rules through scholarly translations such as Richard John Lynn’s The Classic of Changes (1994), which presents each hexagram with its line texts in order. Position matters: the same line type means something different at line 1 than at line 6. For the positional rules in full, see our article on I Ching line numbering: read lines from bottom to top.

Preserve the raw notation. Write down the numbers themselves before you open any commentary. The changed hexagram and the line readings depend on exactly which positions produced a 6 or a 9, so a shorthand like “887997” plus the method used is more reliable than a finished drawing. To manage moving lines across a full consultation, read our guide to I Ching changing lines: how to record and compare them. If you cast with an app, our I Ching app export checklist shows how to save raw lines and the method you used.

Decision Framework

Use this order whenever you cast, so that I Ching line notation 6 7 8 9 stays legible from the first toss to the final reading.

  1. Cast six times and record each number in order; the first cast is line 1.
  2. Map each number to a line: 6 and 8 draw broken yin lines; 7 and 9 draw solid yang lines.
  3. Mark the movers: any 6 or 9.
  4. Draw the primary hexagram from bottom to top and name its lower and upper trigrams.
  5. Flip each moving line (6 becomes solid, 9 becomes broken) and draw the changed hexagram.
  6. Read in this order: the primary hexagram’s judgment, the texts of the moving lines, then the changed hexagram — keeping your raw notation beside you throughout.
  • Six numbers recorded in order (first cast = line 1)
  • Each number mapped: 6/8 broken, 7/9 solid
  • Moving lines (6, 9) marked
  • Primary hexagram drawn bottom to top
  • Lower trigram (lines 1–3) and upper trigram (lines 4–6) identified
  • Changed hexagram drawn by flipping 6 and 9
  • Raw notation kept next to the reading

Key Takeaways

  • I Ching line notation 6 7 8 9 maps cleanly onto the drawing: 7 and 9 are solid yang lines, 6 and 8 are broken yin lines.
  • Only 6 and 9 move; they flip in the changed hexagram, while 7 and 8 stay as drawn.
  • The first cast sits at the bottom, and lines 1–3 plus 4–6 form the two trigrams that name the hexagram.
  • Record the raw numbers before consulting commentary; the reading depends on exact positions.
  • Interpretations are culturally meaningful but not validated by scientific testing predictions. For a wider reference, consult our I Ching hexagrams guide: trigrams, lines, and change, or start with the I Ching complete guide: hexagrams, lines, and consultation.

FAQ

Q: What do the numbers 6, 7, 8, and 9 mean when casting the I Ching? A: Each number records one line of a hexagram. Nine and seven are odd and draw solid yang lines; eight and six are even and draw broken yin lines. Six (old yin) and nine (old yang) are moving lines that change into their opposites in the changed hexagram, while seven (young yang) and eight (young yin) stay stable.

Q: Why do 6 and 9 move while 7 and 8 do not? A: The tradition treats 6 and 9 as “old” lines that have reached maturity and therefore change, while 7 and 8 are “young” lines that remain fixed. A moving line flips in the changed hexagram — 6 becomes solid and 9 becomes broken — signaling where the situation is in transition.

Q: Which hexagram should I read, the primary or the changed one? A: Most practitioners read the primary hexagram for the present situation, the moving lines for the forces at work, and the changed hexagram for the direction of change. If no line moves, the primary hexagram alone carries the reading. Practice varies, so follow the order your chosen translation recommends.

Q: Is the three-coin method equivalent to the yarrow-stalk method? A: Both methods produce only 6, 7, 8, and 9, but they generate each number with different frequencies, and scholars have examined the probabilities and even designed coin procedures meant to match the stalk method (Clarke, 1987; Hacker, 1980). Choose one method, record it, and keep it consistent across a consultation.

Q: Should I save the raw numbers before reading the commentary? A: Yes. The changed hexagram and the line readings depend on exactly which positions produced a 6 or a 9, so a record such as “887997” is more useful than a final drawing. Keeping the raw notation lets you recheck your work or revisit the consultation later.

Sources

Editorial boundary: This article explains cultural and symbolic traditions for education, reflection, and entertainment. It does not provide medical, mental-health, legal, financial, or other professional advice.