Decan (astrology)
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Through Classical element and Planet
Each sign is allocated a triplicity, consisting of three of the four classical elements air, water, earth or fire, and is therefore subdivided into three equal parts of 10 degrees each; these parts are referred to as decans or decanates.
Each decan of a sign is assigned rulership by the planet ruling the sign and secondary rulership by the planet ruling the decan.
In Ptolemy
The decans and their rulers are assigned as follows as based on the description by the Alexandrian Egyptian astrologer, Ptolemy, from whose Tetrabiblos are derived most of the principles of western astrology:
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Traditional Chaldean rulerships
* as used as an essential dignity in astrology.
Notice that rulerships follow a repeating pattern, the Chaldaean order of the planets: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon, based on a geocentric cosmological model.
Modern rulerships
Modern astrology updates the rulerships. Decans or "faces" are the least important of the essential dignities, representing about one-fifteenth of a planet's overall strength in medieval astrology.
The decans and their rulers are assigned as follows as based on the concepts of modern Western astrology :