Decanate

A decanate (also called a decan) is a 10-degree subdivision of a zodiac sign. Each 30-degree sign is divided into three decanates, each with its own planetary sub-ruler. This adds nuance to a planet's expression, layering the sign's energy with a secondary influence.

How it works

The first decanate (0°–9°59') is ruled by the sign's own planetary ruler. The second decanate (10°–19°59') is ruled by the next planet in the same triplicity (element). The third decanate (20°–29°59') is ruled by the third planet in that triplicity. For example, Aries (ruled by Mars) has decanates: 1st decanate Mars, 2nd decanate Sun (fire triplicity), 3rd decanate Jupiter (fire). A planet at 15° Aries is in the second decanate, blending Aries with a Solar flair.

In practice

When reading a chart, decanates refine interpretation. A Venus in Taurus at 5° (first decanate) expresses Taurus qualities directly. At 25° (third decanate), it adds a Capricornian touch (earth triplicity), making it more disciplined. Decanates are especially useful for timing and for understanding subtle differences between people with the same Sun sign.

Explore your own chart's decanates in your natal chart.