Based on the clues given in The Zelator we must conclude that the Eighth Sphere by definition encompasses all the nonphysical aspects of the Matrix Control System, the service-to-self (STS) hierarchy from top to bottom minus the physical levels of which we ourselves are part.
The Eighth Sphere would therefore include: the lower astral planes where carnal and demonic thoughtforms dwell, the hyperdimensional realms inhabited by so-called reptilian beings, the parasitic etheric lattice overlaying the earth comprising the very tendrils of the Matrix, the soul-pool of which spiritless humans are incarnate extensions, and the demiurgic creature positioned atop the negative occult hierarchy sucking into itself all energy gathered from the “tiers” below.
For instance, that spiritless humans have something to do with the moon is clear from the fact that they, being extensions of less evolved (“second density”) energies occupying human (“third density”) bodies, are essentially two-and-a-half density beings, which relates to the two-and-a-half-day pig. Pigs, by the way, are physically incapable of looking up at the sky which, in addition to the fact that they share many human characteristics and have genetics strongly suited to house low vibrational frequencies, makes them ideal symbols for the animal nature in man. That the moon shares an archetypal basis with spiritless humans is further evidenced by it being a second density planet reflecting light rather than generating its own, just as spiritless humans are not fully third density and merely reflect back the soul image of others.