Elemental Dignity by Day and Night
Triplicity (from Latin triplicitas) refers to the grouping of three zodiac signs sharing the same element: fire, earth, air, or water. In Hellenistic and medieval astrology, each triplicity has specific planetary rulers different rulers for day charts (diurnal) and night charts (nocturnal). A planet ruling the triplicity of the sign it occupies gains a form of essential dignity called triplicity rulership weaker than domicile or exaltation, but significant in chart interpretation.
Triplicity Rulers
| Element | Day Ruler | Night Ruler |
|---|---|---|
| Fire (♈♌♐) | Sun | Jupiter |
| Earth (♉♍♑) | Venus | Moon |
| Air (♊♎♒) | Saturn | Mercury |
| Water (♋♏♓) | Venus | Mars |
Triplicity in Modern Practice
Most modern Western astrologers do not explicitly use triplicity rulerships, but traditional and Hellenistic practitioners consider them essential for nuanced dignity assessment. Knowing whether a planet is in its triplicity adds a layer of modest strength even when it lacks domicile or exaltation. In horary astrology especially, triplicity is part of the standard dignity scoring system used to assess a planet's ability to act on behalf of a querent's question.