November 20, 2013 @ 5:07 PM

The Decans or Decanates: 

Each sign is divided into three divisions of 10 degrees, each sign has 3 decans, one for each division of 10 degrees. Each decan has a ruler which becomes the sub ruler of the sign or the co-ruler of that sign. Once you are familiar with the Triplicities (fire, earth, air, water), it will be easier for you to determine the sub-rulers of each decan. 

Each decan of a sign will be in the same triplicity (fire, earth, air, water) as the sign itself. They are arranged in the same order as they appear in the zodiac. The first decan of Aries is Aries, ruled by Mars. The second decan is Leo, ruled by the Sun, the next fire sign in the zodiac. So the second decan of Aries is ruled by the Sun. The third decan of Aries would be the next fire sign after Leo, which is Sagittarius, ruled by Jupiter. Each decan is of the same Triplicity - the fire element. The first decan of Taurus is Taurus, ruled by Venus. The second decan of Taurus is Virgo, ruled by Mercury. The third decan of Taurus is Capricorn, ruled by Saturn. Each decan is of the same Triplicity - the earth element. 

Zodiac Sign 

Aries – Fire 
Ruler of first decan.............0° - 10° - Mars
Ruler of second decan......10° - 20° - Sun
Ruler of third decan...........20° - 30° - Jupiter

Taurus – Earth
Ruler of first decan.............0° - 10° - Venus
Ruler of second decan......10° - 20° - Mercury
Ruler of third decan...........20° - 30° - Saturn

Gemini – Air
Ruler of first decan.............0° - 10° - Mercury
Ruler of second decan......10° - 20° - Venus
Ruler of third decan...........20° - 30° - Uranus

Cancer – Water
Ruler of first decan.............0° - 10° - Moon
Ruler of second decan......10° - 20° - Pluto
Ruler of third decan...........20° - 30° - Neptune

Leo – Fire
Ruler of first decan.............0° - 10° - Sun
Ruler of second decan......10° - 20° - Jupiter
Ruler of third decan...........20° - 30° - Mars

Virgo – Earth
Ruler of first decan.............0° - 10° - Mercury
Ruler of second decan......10° - 20° - Saturn
Ruler of third decan...........20° - 30° - Venus

Libra – Air
Ruler of first decan.............0° - 10° - Venus
Ruler of second decan......10° - 20° - Uranus
Ruler of third decan...........20° - 30° - Mercury

Scorpio – Water
Ruler of first decan.............0° - 10° - Pluto
Ruler of second decan......10° - 20° - Neptune
Ruler of third decan...........20° - 30° - Moon

Sagittarius – Fire
Ruler of first decan.............0° - 10° - Jupiter
Ruler of second decan......10° - 20° - Mars
Ruler of third decan...........20° - 30° - Sun

Capricorn – Earth
Ruler of first decan.............0° - 10° - Saturn
Ruler of second decan......10° - 20° - Venus
Ruler of third decan...........20° - 30° - Mercury

Aquarius – Air
Ruler of first decan.............0° - 10° - Uranus
Ruler of second decan......10° - 20° - Mercury
Ruler of third decan...........20° - 30° - Venus

Pisces – Water
Ruler of first decan.............0° - 10° - Neptune
Ruler of second decan......10° - 20° - Moon
Ruler of third decan...........20° - 30° - Pluto