I did try some basic research (and have looked on and off for years) but have trouble finding any sort of extensive exploration of astrological personality reading. I don't think most scientists take it seriously enough to bother researching, to be honest.
As far as I can tell, any sort of personality reading based on the position of orbital bodies millions of miles away at one's birth isn't really accurate.
Usually any personality descriptions (or daily horoscopes) based on such readings are worded in a vague way that can be applied to anyone at any stage of life.
(This is based on my own experiences and what others have said when I've talked to them about it.)
The human mind also has the wonderful tendency to ignore items in the description that might or might not match up, but latch up on any items that can be somehow applied to one's situation.
Examine the Chinese horoscope concept and things become even more obvious. While there are obvious traits and generalizations that can be made about every "generation" in a given country (for example, Baby Boomers vs. Gen X vs. Gen Y, etc.) based on changes in the economy and technology levels, the Chinese zodiac attempts to give a rotational personality assessment stating that every arbitrary year/360 days lumps you and everyone born that year into a given category.
(Think about all the different personalities in your high school class; it doesn't even make sense.)
In the end, what I see is that astrological charts and the like are usually just the result of people's search for significance, hoping for some sort of external meaning that can be discovered and controlled in order to lay down a successful gameplan for one's life. I just haven't had any real success when looking at astrology for a consistent definition of people's personalities.
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Interestingly, I think horoscopes (like fortune cookies) can be good for something -- they basically offer a "thought for the day" that acts like a mini-devotional, something you can focus on, think about during the day, choose to work on. While they don't predict personality or the future, they can give some people a "direction for the day." (For what it's worth.)