Resurrecting an old thread here to share a bit of information I found pertaining (hopefully) to the subject at hand.
That information is
here, if you don't mind reading a lot of stuff that to my untrained eye looks like Golden Dawn patois, filled with Hebrew symbolism and naming that frankly made my head spin around on my neck. I'll try to summarize, but first I have to quote the man himself (mods please note that he provides no copyright information on his page):
[FONT=Verdana, Arial, Helvetica, sans-serif]Mystic and psychoanalyst Carl Jung wrote about the Black Sun... in his alchemical works. The psychiatrist and pioneering LSD therapist Stanislav Grof relates an anecdote of a client who spontaneously experienced a vision of the Black Sun during a session of holotropic breathing. He subsequently associated the symbol with the "core self" of the client, the hidden radiance underlying the "manifest sun" or ego. The alchemist Jean Dubuis, in a lecture before the Philosophers of Nature stated that "this black sun of Saturn is the one that emits all the mystical influences of Saturn. And at that time chances of contact with eternity are maximum." This is the meaning behind Crowley's reference in the Book of Thoth: "According to an ancient tradition, the sun is also black."[/FONT][FONT=Verdana, Arial, Helvetica, sans-serif]
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[FONT=Verdana, Arial, Helvetica, sans-serif]Contact with the Black Sun is associated with the experience of burning away the dross of the personality, leaving the gold or essential nature of the first matter.[/FONT]
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Special emphasis is paid to Saturn in the article: the reason being that if we regard Saturn's orbit as elliptical, and if we know that the Sun is one of the foci of that ellipse, then there must be a second focus in order for Saturn's path to be an ellipse. The Black Sun is that second focus. While all the planets except for maybe Venus have a second focus defining its path through the heavens, Saturn's is the only one outside Earth's orbit. (Actually, the only one easily calculated; according to the article, the outer planets orbit our solar system's center of mass, or barycenter, and finding that and then a second focus to define an elliptical path seems to have proven cumbersome.)
The guest poster above is partly correct that the Black Sun occupies a position that appears to be fixed, but according to the article [/FONT][FONT=Verdana, Arial, Helvetica, sans-serif]he's 180 degrees out of phase according to the article: it was at 3 Capricorn when the article was written. Of note here (the guest failed to touch on this) is that it is at that position when viewed from a
heliocentric standpoint. Its counterpart on that axis, the Diamond, would then complete the axis at 3 Cancer. And again, if you were standing on the surface of the sun, it wouldn't look like it's moving the way the other celestial bodies do (it does move around the ecliptic, but at a rate of 1°52' a year; it takes twelve thousand years to complete an orbit, so you'd get a little bit sweaty, standing there on the surface of the sun).
From a
geocentric standpoint, it seems to move in a manner similar to the way I understand the Vertex to move, albeit that the Vertex moves windshield-wiper-like in traversing the 5th through 8th houses (correct me if I'm wrong here) and the Black Sun moves windshield-wiper-like between two points on the ecliptic: approximately 16 Pisces and 19 Libra. It tends to move slower as it approaches either of these two extremes, and around 7 June turns retrograde in Pisces. It picks up speed, whipping through Capricorn and Scorpio in a matter of four or five days (22-26 June, during which it reaches aphelion with Earth), slows down again, and turns direct in Libra on or about July 11. Its direct motion is considerably slower: it spends approximately a month each in the last half of Libra, Scorpio, and Sadge; then two months each in Capricorn, Aquarius, and roughly the first half of Pisces before turning retrograde again.
So far the only bit of Black Sun interpretation I was able to find regarding its astrological significance was that alchemy-speak in the quote about it burning away the impurities in order to allow our true selves to shine. I haven't seen the Bode book the guest mentions, but I take it that the guest's interpretation of the Black Sun (q.v. the fourth post in the thread) follows on from Bode's.
EDIT:
this article from Astrotheme.com identifies the point in question as existing at 13 Cancer, and gives it a name: Dionysus. Now I'm not at all certain which is the Black Sun and which is the Diamond... and so far I've found nothing about interpreting the Diamond.
Back to the mines then...
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I saw actually afterwards the article in facebook and I read it and saw it was given as 12-13 degrees cancer.