Harmonic Charts

What they are

A harmonic chart is generated by multiplying each natal longitude by an integer N and taking the result mod 360. In effect, it "folds" the zodiac N times, bringing distant points onto the same position when their separation is exactly 360/N degrees.

The 9th-harmonic chart is mathematically identical to the Vedic Navamsha (D9), which Western astrologers rediscovered through John Addey's work in the 1970s.

How to find it

Hamburger → WESTERN → Harmonic Charts. Pick a harmonic N from the preset buttons (5, 7, 9, 12, 16, 22) or type a custom number.

Why each harmonic matters

N	What it reveals
2	Oppositions in the natal — relational dynamic, conflict-and-balance
3	Trines — natural flow, creative ease
4	Squares — challenge, life-task structure
5	Quintile / bi-quintile — creativity, unique gift, eccentric brilliance
6	Sextile — opportunity, helpful contacts
7	Septile — fate, mystical / hidden talent, irrational pulls
8	Semi-square / sesquiquadrate — friction-resolution dynamics
9	Navamsha — soul-level / spiritual-marriage / inner essence (Vedic D9)
10	Decile — synthesis, completion patterns
11	Undecile — uncommon, individuated
12	Semi-sextile + sextile + trine — flow + minor friction
16	Sub-conscious / hidden patterns
22	Karmic life-purpose / "soul-task" patterns

How to read

Each row shows:

Planet — Su, Mo, Me, …
Natal Lon — original longitude
Harmonic Lon — natal × N mod 360
Sign — sign in the harmonic chart

Now look at aspects between the harmonic positions. Two planets that aspect each other in the 5th-harmonic chart have a quintile-family relationship in the natal — even if their natal positions don't aspect each other directly.

Conjunctions in the harmonic chart are especially powerful — they reveal "hidden" relationships between natal placements that don't appear in the standard wheel.

Pairing with the natal

The harmonic chart doesn't replace the natal. It's a lens. Read the natal first, then check a harmonic to see what hidden pattern the matter under study has:

For creativity, check the 5th
For talent / vocation, check the 7th
For soul-purpose / dharma, check the 9th (Navamsha)
For karmic life-task, check the 22nd

Sources

John Addey, Harmonics in Astrology (1976) — the foundational modern Western text
David Hamblin, Harmonic Charts (1983) — practical application
The Vedic D9 (Navamsha) is identical to Addey's 9th harmonic