Not to worry though because the most important boundary in astrology is the Universe.
Next would come our home galaxy, the Milky Way.
Then, our solar system. Sadly, far too many people think the boundaries of astrology end here.
In my book, which I hope you'll download and read (free), I begin by putting the reader in a spaceship coming back from "somewhere" and dealing with one of the outer "boundaries" of our solar system.
In that first chapter, Xena and the Hordes, I mention this idea:
"This is where astrology begins. Further out, between the stars, is the space that symbolizes 'contact' with 'other souls' that inhabit a purely spiritual dimension. Once inside the atmosphere of the Sun, we’re dealing with aspects of ourselves that relate to life on a very solid earth, even though Xena and the Hordes are aspects of our minds that we rarely think about."
In that chapter, I'm dealing with what are called "archetypes"—psychological energies that we all have to deal with, sometimes creatively but most often (due only to lack of experience) in a manner that causes us grief and unnecessary pain.
One person I respect in regard to explaining the "deeper" parts of ourselves is Carl Jung. And, since any valuable practice of astrology needs a solid psychology behind it, I'll give Carl a chance to say something about this realm:
"Anyone who wants to know the human psyche will learn next to nothing from experimental psychology. He would be better advised to put away his scholar's gown, bid farewell to his study, and wander with human heart through the world. There, in the horrors of prisons, lunatic asylums and hospitals, in drab suburban pubs, in brothels and gambling-hells, in the salons of the elegant, the Stock Exchanges, Socialist meetings, churches, revivalist gatherings and ecstatic sects, through love and hate, through the experience of passion in every form in his own body, he would reap richer stores of knowledge than text-books a foot thick could give him, and he will know how to doctor the sick with real knowledge of the human soul."
Your feelings and thoughts?