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Reeves' book[1]

There are two definitions of the quindecile aspect ("Quindecile" is the Latin word for 15):

  • 1. A minor and unimportant aspect formed by the division of the 360⁰ horoscope into 15 segments of 24⁰ each
  • 2. A division of the zodiac into 24 sections of 15 degrees each yields an aspect of 165⁰ (termed the quindecile by Thomas Ring, Noel Tyl, and Rikki Reeves)

As with any Minor Aspect, a narrow Orb is recommended. Reeves proposes 2 degrees for most planets, 2.5 degrees for the sun and moon, and perhaps up to 3 degrees in charts showing few other stressful aspects.


Nicknamed “the fatal in the natal”, the quindecile is an aspect of obsession and compulsion, to the point where the individual may become separated from reality in the areas of life indicated by the placements of the planets involved.


  • Ricki Reeves, 2001,The Quindecile: The Astrology & Psychology of Obsession, Llewellyn Publications, U.S., Paperback ‎ 208 pages, ISBN-10 1567185622, ISBN-13 978-1567185621

Notes and References

  1. Cover text: We like to think we are sensible beings who base our actions on conscious decisions. The fact is, all of us are subject to the occasional irrational impulse, the "wild hair" that surprises us and those around us. Usually, this is not a big problem -- in fact, it can act as a safety valve for our creative abilities and a check against unnecessary self-restriction. But it's not so healthy when we find ourselves driven by compulsions and obsessions that seem to take over our lives and consume our attention and energy. How can we discover the origins of these forces? Can we turn them into something constructive? Astrology provides a key to these questions in the quindecile. This newly researched 165-degree aspect of hidden driving forces is thoroughly explored in these pages by an experienced astrologer and mental health professional. Numerous chart examples support the analysis of the quindecile in natal, transit, progressed, and synastry horoscopes. A full set of delineations and interpretations lets you quickly add this illuminating factor to your understanding of any chart. In these pages, you will explore:
    • The psychological dynamics of obsession-compulsion
    • Planetary dynamics by sign, element, and triplicity
    • The quindecile in natals, progressions, transits, and synastry
    • A full reference section of interpretations and delineations
    • Numerous chart examples of well-known people
    You will find that The Quindecile not only points out the nature of inner compulsions, but also suggests ways to transform them into constructive, creative activities and projects.