According to Charles Carter, “this is the most common aspect in the charts of astrologers, particularly those involved in the art of predictive astrology.” He suggests that astrologers with this aspect are essentially psychic, capable of offering strikingly accurate predictions. Carol Rushman, author of The Art of Predictive Astrology, has an exact Sun–Neptune conjunction in her 8th house. While it’s possible she’s never come across Carter’s writings, it’s undeniable that she has dedicated her life to the art of astrological prediction.

The 8th house, with all its secrets and shadowed mysteries, is no ordinary setting for a planetary meet-up. It’s the house of death and rebirth, of shared resources and unseen realms. To have Neptune, a planet synonymous with dreams, illusions, and spiritual longing, in aspect to the Sun here is to suggest a life  lived through an inner knowing. It’s a kind of psychic permeability, a dissolving of the boundary between the self (Sun) and the spiritual or symbolic world (Neptune). Those with this aspect are living the archetypes, feeling their way through time.

“In thirty years of working as a professional astrologer, I find that the predictive part of astrology is by far the most exciting. There was a time when predictive astrology was not the thing to do. It was the 1970s and astrologers were using their expertise strictly as a psychological tool…Astrology’s insight into the future is part of the intrigue and mystery that draws people to it. The most popular astrologers with great followings know how to make accurate predictions. When you are new to astrology there is nothing like making your first prediction. I can remember it very clearly. I told a friend who was waiting to hear from a lover (she had not heard from him for five weeks) that word would come Thursday. When she called me that Thursday evening, I don’t know which one of us was more amazed. He had called. There was no thrill quite like it. That was over thirty years ago.” The Art of Predictive Astrology: Forecasting Your Life Events

If the public admires and idealizes astrologers, it may be due to their ability to make forecasts. This kind of insight can wrap them in Neptunian mystery, leading others to suspect they possess supernatural gifts.