Daleth, Daleth Daleth ... where to start. You speak as if I am not aware of everything you have listed.
...No, 9 AM is not a viable time producing a viable degree to work with. You may be incredulous, but I'm working with important factors you are not aware of and have not included in your considerations.
You are working with theories that you insist are correct. I am working with the time of day that
Bowie's mother said he was born. In other words you are working with your personal belief system--your "Chart Validations Standards"--while I'm working with a reliably sourced fact.
Listen, I'm a Capricorn (Sun-Mercury conjunct in the third). If I have to choose between a fact and a theory--if the situation is such that they can't both be true--I'm choosing the fact, because the whole purpose of theories is to help us explain, understand and anticipate facts. If a theory doesn't do that, if it's irreconcilable with facts, it's wrong. Unless I'm working in the realms of imagination and the nonrational--in other words, artistic creation, spiritual exploration, etc.--I'm going to go with facts every time.
Facts can prove a theory wrong, but theories cannot prove facts wrong.
And your theory, at least as I'm understanding what you wrote, is empirically unprovable because you don't let facts interfere with the theory. That is, if someone tries to point out that a specific person's reliably-sourced chart shows a weakness or error in your theory, instead of tweaking the theory,
you change the chart(!). That to my mind is a completely irrational and wrongheaded way to practice astrology. It's a refusal to learn, because you think you already know everything.
You said, for instance:
Bowie most definitely did not have an early degree of Aquarius rising. In spite of the very good surface evidence, that degree area was easy to eliminate.
It was easy for you to eliminate because you are not willing to consider that anything about your theory might be wrong or incomplete. You thus seem to care more about clinging to your theory as you currently understand it than you do about
testing your theory against
reality--that is, an accurately sourced chart. But
testing theories against reality is how you refine and perfect them; it's how we grow in our understanding of astrology, instead of letting our minds ossify around one sacrosanct, unchangeable theory.
Tell me this, have you ever rejected the time on a birth certificate in favor of a totally different chart that you "rectified" based on your theory? I bet you have, since that's just about what you're doing here. Bowie's birth time comes from his mother. It's hard to get a more accurate source than that, and in places like England, which doesn't put birth times on birth certificates, it's impossible. She said 9AM; rectifying to 8:52AM or 9:18AM is one thing, since 9AM is almost certainly rounded, but moving his birth time
15 hours later, to a completely different time of day that his mom couldn't possibly have mistaken for 9AM, is an unbelievably cavalier thing to do.
My approach to rectification allows me to move past "allegedly" or other word of mouth quotes related to birth times... It is amazing how they create pre-loaded confirmation bias.
Clinging to your theory no matter what the facts are, and insisting that a time you chose solely because it fits your theory (and to hell with the facts), is a great example of confirmation bias.
My last statement that you quote, "All events must show in progressions" is ironclad....If a chart fails to show tight secondary progressed aspects for dates of key life events when considering all such aspects, then it is incorrect.
Right, I know your view is ironclad; in other words, your theory is god and you will not deviate from it no matter what the facts are. You even believe that transits alone can't show significant events, which to put it nicely is a minority view among experienced astrologers.
You can cling to the early Aqua Bowie chart tightly, as if it were 'yours', but it is exactly that mindset that prevents consistently accurate rectification work.
How do you know it's accurate, if you reject facts that suggest your theory might have some flaws? In other words,
how do you know your theory is accurate if you refuse to test it against facts? Your approach is completely tautological.