There isn’t any scientific reasoning at all. And there is no need either.
Posted on Quora
Scientific thinking is based upon an objective analysis of things as they are (or seem to be) through a theoretical statement giving some validity to the facts or experimental observations (or both).
On the other hand, astrology takes into account the interaction between the phenomenon and the observer. From an astrological point of view, the whole universe and our awareness join in the same process; that’s the reason why we can’t tell that there is a planetary influence. Relatively speaking, planets and stars exist separately from our consciousness and, as such, are subject to scientific investigation. Conversely, astrology undermines the assumption that the physical world exists independently of our observations (as quantum mechanics does). Consequently, astrological factors act like a symbolic mirroring of the reality we belong to, so our nature becomes highly readable via these symbols.