Triplicity

tri-PLIS-ih-tee

greek: τριγωνοκρατορία (trigonokratoria)

Definition

A triplicity is a set of three zodiac signs that share the same classical element. They stand 120 degrees apart on the wheel, marking an equilateral triangle. There are four: Fire (Aries-Leo-Sagittarius), Earth (Taurus-Virgo-Capricorn), Air (Gemini-Libra-Aquarius), and Water (Cancer-Scorpio-Pisces). The Greek word for the shape is trigōnon; medieval Latin renders it triplicitas.

In Tradition

For Hellenistic, Arabic, and traditional Western astrologers, the triplicity is the zodiac grouped by element. Within the dignity scheme — the system that rates how strong a planet is — each triplicity carries its own assigned rulers, usually three planets ordered as day-ruler, night-ruler, and partner, and these differ from the domicile (sign) rulers. Modern Western astrology keeps the elemental grouping for describing character but often sets the per-triplicity rulers aside.

In Practice

Astrologers read element balance by counting placements in each triplicity, weighting the Sun, Moon, and planets near the angles more heavily; a strong showing or a gap in one element shapes the temperament reading. In sect-based assessment, you check each sign's triplicity-rulers against the chart's sect — whether the birth was by day or by night, with a Sun above the horizon taking the day-ruler — and read those rulers' condition by sign, house, and aspect as describing the affairs of the house the triplicity falls in. The triplicity also shapes aspect patterns: a grand trine is three planets within one triplicity, agreeing by element.

Historical Origin

The triplicity scheme is standard in Ptolemy's Tetrabiblos I.18 and runs through Dorotheus, Valens, and the Hellenistic compendia. The three-ruler-per-triplicity sect-based scheme is set out most fully in Dorotheus of Sidon's Carmen Astrologicum (1st c. CE) and codified by al-Biruni at Kitāb al-Tafhīm §379-380 (c. 1029), under the Arabic term muthallatha ("triangle, triplicity").

Definition

In Tradition

In Practice

Historical Origin

Further Reading