Whether you (or Barnum) like it or not, Alice, the personal daily horoscope readings at Astrodienst are much more meaningful and accurate than those typically in found in newspapers etc. Why? Because they are, in fact and in reality, based on one's complete and unique personal natal chart and not just on the sun-sign shared with 1/12 (approx) of the human population.   

It doesn't require alleged "effects" or "scientific hypotheses" to observe or understand or explain this. IN fact, I've discovered the differences in horoscope techniques simply through direct personal experience and observation over the years. Do the same, and you'll eventually learn all about it too. Till then, you can devour scientific articles and journals till they're comin out your yin-yang -- and you'll still know diddley-squat about astrology.

Except that you know you feel sooooo smart when you attempt to sling mud at it. And with the bulk of the scientific community supporting you, too! Oooo ... the OmniScient One of the 21st Century is still on your side to date, after all - what more could you ask for!