So, here's the deal...When you are born, you have already existed for 9 months, you have been capable of living on your own for at least the past 2 or 3 months (if premature delivery), and your place in the universe changes physically by less than 2 feet, from inside the womb to outside it. The only difference between one state and the other is a few layers of tissue.
How in the world can that little change of location be of any significance in relation to objects millions, billions, trillions of miles away? Further, the "rules" of astrology were set down long before people knew how planets and stars worked, how far away they are, their difference in size, etc.
Pure bunk.
Did the superstitious people of old notice a difference in people born at different times of the year? Possibly. But they had no idea of the real causes, so they superimposed the motion of the planets on those observations.
For instance, in the present day, people born in the springtime have a statistically higher probability of committing suicide. Alignment of the stars? Nope. Evidence points to the increased probability that the mother drank more during Xmas/New Years' holiday celebrations, which may coincide with a particular developmental stage in the fetus' brain (4th, 5th, or 6th month). It's entirely possible that long ago the wide differences in seasonal food availability (poor overall diet in winter leading to vitamin deficiency, etc.) may have had an even greater effect on the mental and physical development of babies born at different times of the year. And that may explain the completely spurious notion of astrology. But that's just my opinion.