If you e-mail me your birth information, I will e-mail you a tri-ring chart showing your natal chart, your vertical zodiac chart and your decanate chart. Send your request to
You can purchase my book ‘The Decanate Chart’ and all of my books at LULU
Decanates have been a part of the astrological vocabulary for centuries, even millennia. Ptolemy lists 48 constellations in his book Almagest, written circa 150 A.D. Take away the twelve constellations associated with our twelve signs, and there remain 36 constellations, one for each of the 36 decanates. However, very little use has been made of decanates, except by the Brotherhood of Light (now Church of Light), in their Course VII (Spiritual Astrology), which delves into this subject in great detail and relates each decanate to a beautiful, illustrative story. A true gem of a book!
WHAT ARE DECANATES?
Signs are measured in degrees (º), minutes (‘) and seconds (“). Every sign has 30º and can be divided into three 10º sections called decanates. Each one of these three decanates relates to one of the signs of the particular element, i.e. triplicity.
The sign Aries belongs to the fire triplicity (Aries, Leo and Sagittarius). Thus, the first decanate (10º section) of Aries is the pure Aries decanate and relates only to its entire sign (all 30 degrees of Aries). The second decanate relates to, and has an affinity with the entire sign of Leo. The third decanate relates to, and has an affinity with the entire sign of Sagittarius.
The Decanate Chart system is based on the premise that, if a 10 degree section of a sign corresponds to an entire 30 degree sign, then any point within that 10 degree section (a planet, Ascendant, M.C. or even a house cusp) has a corresponding position three times its value in the respective entire sign.
Here is an illustration of the principle of projection:
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