Tyl Quindecile
Aspect Degree: 165
Degree Orbs: 1-2°
Glyph: 165° (Tyl)
Description:
The Tyl Quindecile is the 165° aspect popularized by Noel Tyl and developed in Ricki Reeves’s work on obsession. It is associated with obsession, intense focus, determination, and psychological fixation — an extraordinary capacity for concentration, or a tendency toward compulsive behavior.
Important distinction: 165° is mathematically a multiple of 15° (11 × 15° = 165°, belonging to the 24th harmonic). It is not the 24° Quindecile (360° ÷ 15, 15th harmonic). In this vault the name Tyl Quindecile is reserved for 165° so the two meanings cannot be confused. The arithmetic Quindecile at 24° is Quindecile.
Key Points:
- Signals compulsive or obsessive tendencies in a specific area.
- Reveals where willpower or focus becomes extreme.
- May lead to sacrifice, burnout, or transformation through obsession.
- Can be a signature of mastery through struggle, repetition, and/or fixation.
Example Interpretations:
Venus Tyl-quindecile Pluto: Obsessive love or control dynamics; intense desire for emotional transformation.
Mercury Tyl-quindecile Saturn: Rigid thought patterns or unrelenting mental discipline; potential for intellectual mastery and/or inner silence.
Use in Practice:
When interpreting Tyl Quindeciles, look for where the chart-holder is pulled toward something with magnetic focus — willingly or not. These aspects describe areas of hyper-focus or unconscious drive, which can be useful when made conscious and destructive when ignored. In metaphysical practice, they may signal initiation points, karmic bindings, or soul obsessions meant to be confronted, integrated and eventually transcended.
They are especially relevant in psycho-spiritual work, where the line between shadow and proper must be walked with clarity and care.
aspects/minor #aspects/decile #aspects/tyl-quindecile
🧮 Aspect Arithmetic
| Quantity | Value |
|---|---|
| Exact angle | 165.000000° = 165°00′00.0″ |
| Formula | 360° × 11/24 (= 11 × 15°) |
| Harmonic number | H24 (11th multiple of the 15° unit) |
| Fraction of circle | 11/24 |
| Shortest-arc separation | 165.000000° |
| Explement (360° − angle) | 195.000000° |
| Orb (this vault) | 1–2° (author) |
| Family | Named with the Decile / 15° series for cataloguing; not the 24° (H15) Quindecile |
Naming law: always write Tyl Quindecile (or “165° Tyl Quindecile”) for this aspect. Do not call it simply “Quindecile” in this vault — that name means 24°.
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: 6 Decile Family · 2 Minor
- Counterpart: Quindecile (24°) · Quindecile (2 Minor)
- 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)
- Noel Tyl — popularizer of the 165° quindecile as obsession / compulsion
- Ricki Reeves, The Quindecile: The Astrology & Psychology of Obsession (Llewellyn, 2001) — the 165° aspect
- John M. Addey, Harmonics in Astrology (1976) — harmonic (360°/n) theory of aspects