I'm assuming that would work on the same principles that a "psychic" uses. Nothing but bull**** and cold-reading.
I am not quite sure. I think astrology has something to do with planet alignments and angles not much "reading" involved from what I understand. But every time I have gotten a detailed charting with the birth time used as the starting point its pretty spot on describing primary personality tendencies and even antipathy. Generally I have done these sorts of things in an online environment without seeing someone but a girlfriend who was really into that sort of thing wanted to go get a live chart done up, which we did. It turned out about the same as the others that were done. Your probably right, astrology is a bunch of hocus pocus. But I do for whatever reason find fascinating on occasion.
As far a personality tests, I am not sure they encompass the duality or multiplicity that is some people's personality, and that people are different in different situations. For instance I have been in some very extremely dangerous very high stress situations both as part of a team and as a leader. My personality at those times would be described probably as machine like, very cold, curt, precise, disembodied and utterly no fear or other feeling, ruthless even, utterly and completely focused. Feelings of any kind were dampened to almost nothing other than an occasional passing thought. The best way to describe it would be to as watching yourself though your own eyes while your body is on autopilot and you are observing and making occasional corrections. Things are moving fast and slow at the same time. Decisions were made instantaneously without regard to the feelings of others in regards to accomplishing the mission that was at hand, which was the highest priority. Many of my decisions were made before the mission ever left base and just adjusted for circumstance of the time. I have only ever had that "personality" if you will while under the most arduous of circumstance. I have never duplicated it stateside, ever. Most decisions of any consequence I tend to over analyze and dither a bit, more so the less clear cut the optimum choice is, and I tend to stop and examine shiny objects that catch my fancy. My family calls out shiny object every time I get sidetracked which is very often. Absent minded would be a generous term. I am so bad I get sidetracked, while am sidetracked, I love finding rabbit holes to explore. The point being that I think most people have a at least a duality of personality that can be polar opposite of their primary personality which I think that a personality test unless its exceptionally detailed is not going to catch especially if the subjects have never been in high stress situations, so the subjects wouldn't even know about that side of their personality.
I would expand that further and say that some people can be more compartmentalized than others in personality traits and it depends on time and place for certain of those traits to manifest. I myself was unaware of my "Computer Mode" for lack of a better description, until I found myself in the middle of a certified **** storm complete with high speed high volume fan. I know for certain I have more than one "personality" depending on the circumstance, though they tend to be more or less revolve around my primary personality. I think schizophrenia is an extreme manifestation of this duality, multiplicity that people have. That's also why I think schizophrenia is brought on by extreme duress, and instead of reverting back to their primary personality they for whatever reason, continue to exhibit the alternate personality or flip between personalities.
Famous people that have my personality archetype.
Socrates, philosopher
Rene Descartes, philosopher
Blaise Pascal, mathematician, philosopher
Isaac Newton, physicist
Carl Jung, psychologist
Albert Einstein, physicist
James Madison, the former U.S. president
Dwight D. Eisenhower, a former U.S. president
Gerald Ford, former U.S. president
Tiger Woods, professional golfer
I guess that puts me in pretty good company.