There is none as such, at the moment they're still making bigger telescopes and rockets to GO to the planets and study them. it's quite strange that you could feel good by asking this question when you know we're eons away from explain it scientifically.
In the meantime, you act like a sensible person and do trial and error, until you feel astrology's certain enough to trust...
EDIT : WHAT? THUMB DOWN? This internet thing has to stop, too many stupid people have a sort of authority...
OH THATS BETTER 2 and 2...but if only ppl could explain...
Now 3 and 3..that science freak must have done it, astrology can't be proven? We'd need to run tests on many people, and do it properly. Why it hasn't been done? who knows, maybe you need to be boring to be in the SERIOUS science field and so totally devoid of LIFE...
Maybe they^ll mock you if you try and test astrology...what an ape-like world we live in. AND MOST PEOPLE DONT"WANT" ASTRO.TO WORK, WE'VE JUST NOTICED THAT IT DOES WORK...AFTER BEING SCREWED OVER BY THE SAME TYPE OF PERSON OVER AND OVER. THAT'S USUALLY WHEN YOU LOOK INTO WHY, AND YOU FIND HOROSCOPES, AND FUNNY ENOUGH, IT'S AN ARIES OR A TUARUS, OR A VIRGO THAT SCREWS YOU OVER. NEVER SOMETHING ELSE...FUNNY THAT, DON'T YOU THINK???