Minor Grand Trine
Definition
A Minor Grand Trine is a three-planet pattern: two planets form a trine (120°), and each of them also sextiles a third planet (60°), making an isosceles triangle on the chart wheel. The whole figure spans 180° of zodiac, with the trine running across the base and the apex planet sextile to both base planets. It is distinct from the full Grand Trine, which needs three trines closing into a 360° equilateral triangle.
In Tradition
Modern Western astrologers read the Minor Grand Trine as a flowing, opportunity-rich pattern that — unlike the full Grand Trine — keeps some active push, through the sextile and through the apex focus. Bil Tierney's Dynamics of Aspect Analysis treats it as an integrative pattern; Robert Hand and Sue Tompkins discuss it as a less common but useful pattern in modern Western interpretation.
In Practice
The practitioner identifies the configuration by scanning for any trine pair, then checking whether a third planet sextiles both ends of it — within the usual orbs of 6-8° for the trine and 4-6° for the sextiles. The apex planet is read as the focal channel through which the trine's flow comes out. The configuration is read as a constructive resource, but one that needs the apex planet to be actively engaged before it does anything; left alone, it stays latent. Transits to the apex planet are tracked as the moments that switch it on. The pattern is not as common as the T-square or the Grand Trine.
Historical Origin
The Minor Grand Trine is a 20th-century named-pattern category, alongside the T-square, Grand Trine, Yod, Kite, and Mystic Rectangle. Bil Tierney's Dynamics of Aspect Analysis (CRCS 1993) gives it its canonical treatment; Sue Tompkins's Aspects in Astrology and Robert Hand's Horoscope Symbols extend the framing. Hellenistic and Arabic sources have no such named-pattern category.
Further Reading
- Bil Tierney, Dynamics of Aspect Analysis
- Sue Tompkins, Aspects in Astrology