Barleywine
Although I'm not sure the Golden Dawn knowledge papers tackled this subject, Aleister Crowley certainly did, as did his spiritual descendants (Duquette comes to mind). As both an astrologer and a student of hermetic qabalah, I've often challenged myself with this conundrum and eventually came up with a schema that makes sense to me. I'd like to throw it out for comment here.
The question is how to assign the "modern" (outer) planets Uranus, Neptune and Pluto to the sephiroth on the Tree of Life. I believe the Golden Dawn assigned the Primum Mobile to Kether, the Sphere of the Zodiac to Chokmah and nothing to the hidden sphere Daath (possibly because Pluto hadn't been discovered yet, so the "set" wasn't complete). Later writers mixed these ingredients around a bit, sometimes assigning Uranus to Kether and sometimes Neptune. None of these writers really explained the rationale for their attributions, at least not to my satisfaction. While such assignment isn't crucial to working with the Tree, it imparts a pleasingly rational sense of completeness and symmetry (e.g. 10 spheres ruled by 10 zodiacal "planets," with the Earth as Malkuth).
I've thought about it quite a bit over the years. To me, the one "no-brainer" seems to be Neptune as a shoo-in for Daath since it has much about it that is hidden, concealed, amorphous, nebulous, vague, etc. I give Uranus to Chokmah since it is the ruler of astrology according to modern authorities, and astrology at its most basic is the study of the sphere of the zodiac. Also, Chokmah represents the Father, and Uranus was "Father Sky" (the domain of the zodiac) in Greek mythology, paired with Gaia, "Mother Earth" (Binah/Saturn), and also the father of Cronus/Saturn. That leaves Pluto for Kether. Pluto is the "jumping off" place for any journey into the "limitlessness" of interstellar space, and by its highly eccentric elliptical orbit it communicates more intimately with the void than any of the other planetary bodies, much as Kether stands (figuratively, anyway) in relationship to the Ain Soph Aur. (For the record, I ignore known and postulated asteroids/"dwarf-planets" and other "traveling gravel" flying around out there.)
This has been my working hypothesis for the last 35 years or so. I would really appreciate other reasoned opinions.
The question is how to assign the "modern" (outer) planets Uranus, Neptune and Pluto to the sephiroth on the Tree of Life. I believe the Golden Dawn assigned the Primum Mobile to Kether, the Sphere of the Zodiac to Chokmah and nothing to the hidden sphere Daath (possibly because Pluto hadn't been discovered yet, so the "set" wasn't complete). Later writers mixed these ingredients around a bit, sometimes assigning Uranus to Kether and sometimes Neptune. None of these writers really explained the rationale for their attributions, at least not to my satisfaction. While such assignment isn't crucial to working with the Tree, it imparts a pleasingly rational sense of completeness and symmetry (e.g. 10 spheres ruled by 10 zodiacal "planets," with the Earth as Malkuth).
I've thought about it quite a bit over the years. To me, the one "no-brainer" seems to be Neptune as a shoo-in for Daath since it has much about it that is hidden, concealed, amorphous, nebulous, vague, etc. I give Uranus to Chokmah since it is the ruler of astrology according to modern authorities, and astrology at its most basic is the study of the sphere of the zodiac. Also, Chokmah represents the Father, and Uranus was "Father Sky" (the domain of the zodiac) in Greek mythology, paired with Gaia, "Mother Earth" (Binah/Saturn), and also the father of Cronus/Saturn. That leaves Pluto for Kether. Pluto is the "jumping off" place for any journey into the "limitlessness" of interstellar space, and by its highly eccentric elliptical orbit it communicates more intimately with the void than any of the other planetary bodies, much as Kether stands (figuratively, anyway) in relationship to the Ain Soph Aur. (For the record, I ignore known and postulated asteroids/"dwarf-planets" and other "traveling gravel" flying around out there.)
This has been my working hypothesis for the last 35 years or so. I would really appreciate other reasoned opinions.