Semisextile
Aspect Degree: 30
Degree Orbs: 1-2°
Glyph: ⚺
Description:
The semisextile forms when two planets are 30 degrees apart, placing them side by side in neighboring signs. It is considered a minor aspect and usually indicates subtle adjustments, low-pressure awareness, or opportunities for integration. The energies involved are often incompatible by element or mode, yet close enough in proximity to influence each other.
This aspect is neither harmonious nor tense buy default — its tone depends on the planets involved. It can feel awkward or unnoticed, but when worked with consciously semisextiles can produce gentle shifts, internal alignment, and/or bridging moments of clarity.
Key Traits:
- Suggests mild tension or opportunity through small shifts.
- Often feels neutral or subtle, offing quite moments of integration.
- Good for bridging gaps between energies.
Example:
Sun semisextile Venus: Light connection between ego and love nature; small openings for harmony.
Use in Practice:
Semisextiles often show where small, conscious actions can make a difference — they’re whispers, not shouts. In chart interpretation, they may highlight habits or personality traits that gently influence one another, or make zones of quit growth and cooperation.
In spiritual or metaphysical work, a semisextile can act as a ritual tuning fork, inviting the practitioner to refine, soften, or adjust. Use this aspect to explore micro-alignments, internal reconciliations, and/or low-friction integrations that unfold over time.
aspects/minor
🧮 Aspect Arithmetic
| Quantity | Value |
|---|---|
| Exact angle | 30.000000° = 30°00′00.0″ |
| Formula | 360° × 1/12 |
| Harmonic number | H12 |
| Fraction of circle | 1/12 |
| Shortest-arc separation | 30.000000° |
| Explement (360° − angle) | 330.000000° |
| Orb (this vault) | 1–2° (author) |
| Family | Minor aspects — harmonics 8, 12 (and 15) |
Detection rule (all aspects): with Δ = |λ₁ − λ₂| mod 360 and d = min(Δ, 360 − Δ), an aspect of angle A (≤ 180°) is in orb when |d − A| ≤ orb. Applying vs. separating is decided by whether |d − A| is shrinking or growing as the faster body moves.
🔗 Related
- Family: 2 Minor · index
- Siblings: Inconjunction (Quincunx), Quindecile, Semisquare, Sesquiquadrate (Sesquisquare)
- All aspects: Aspect Index · Aspects README
Traditional and modern attributions above are optional correspondences. Within Astrology Arith(m)etic the definition at the top of this note is the working law.
Sources (aspect arithmetic)
- John M. Addey, Harmonics in Astrology (1976) — harmonic (360°/n) theory of aspects
- David Hamblin, Harmonic Charts (1983) — 5th, 7th, 9th and 11th harmonic aspect families