The astrology used today is actually much more specific then ages ago. A type of astrology called Vedic astrology is one branch of astrology that makes up for the "wobble" of the Earth for example, it is the branch I choose to use. The difficult thing with astrology is, there are many branches of it in calculating positions. I haven't studied all of them, there is just so much to understand. I think it is safe to say that astrology is by no means "complete" either, that is why it is referred to as "the study of cycles". It is ongoing continuously, and as we discover more and more celestial bodies, it throws in more variables. Instead of me re-explaining these points over and over, it would be much easier if you took the time and had your chart done (it can be done for free) on one of these computer programs (
www.astro.com) and see what basic intepretations it came up with. You might get a slight glimpse of how it works, as it is not always easy to explain in words through a forum. Just see for yourself, then we can have similar ground to start communicating on. If you like, PM me your info and I can do it for you as well.
As far as what Ivan has stated, I can attest to what he says as true a majority of the time, but only from my own personal experience. It's not "scientific", but it is a part of my studying it-by actually calculating charts and learning the interpretation process. Technically I guess I do gather statistics, but only store them in memory, not on paper. I have the faith that it works to a degree, so I am not trying to find a way to disprove it. Had I found it to be bogus years ago after all the time and effort I have put into it, I would have stopped studying long ago. Astrology keeps me intrigued because I do see patterns and tendencies, far beyond what one would call coincidences.
There is much controversey about the validity of the Mars Effect. From the charts I have seen, I see a significant spike in the placement of Mars in accordance to how athletic one is. Would you be able to interpret what Mars means and what house it is in? Would you be able to interpret what that house is and what part of life it represents? Would you be able to search for negative or positive aspects to that Mars placement and interpret those? Then you also have to take in account that person's experience, upbringing, environment and that impact on the individual's developement-especially as a child. Does this show how complicated astrology is? Would you have known about the infinite variables to consider? Also, a progressed chart could show reflections-both positive or negatives to the natal chart. Have you any idea what the progressed chart is? It too will have the infinite variables that can combine with the infinite variables of the natal chart. Like I said, there is so much to know, and I know some basics, but not even enough to be a registered astrologist. All of these variables can make the world of difference, and learning to interpret it all together is the true art of astrology, not a science.