What exactly is the mechanism by which the stars and planets affect us?
It just seems strange that objects that are billions of miles and millions of light years away could have any possible effect on us, other than their twinkling.
Coincidence does not necessarily imply causation - nevertheless, it does not necessarily imply randomness either.
Can you not accept the possibility that being born in a certain month of the year could affect your personality, disposition and inclinations?
Time of the year affects what food you eat - therefore what nutrients your mother was injesting when she was pregnant - not to mention that it could affect what food you will eat when you transition to food.
The temprature outside could affect how much you were outdoors in the first few months in your life - which could affect how much sunlight you recieved and how much stimulation your brain recieved.
The height of the sun in the sky could also affect how much sunlight you recieve at critical times in your development.
Being indoors in cold weather could result in more close physical contact with parents during certain critical developmental periods.
The constellations in the sky signify different times of the year.
Just because Virgo is in a certain place in the sky on your birthday, doesn't imply the that the constellation affects you directly and personally in any way (though power of suggestion most certainly should not be ignored), however, being born in the beginning of the harvest season, and it being winter when you are ust a few months old, very well could.
If Bill get's grumpy at 5:30 PM every day in rush hour traffic, that doesn't necessarily mean that the angle of the sun is making him grumpy, but you could time it that way, couldn't you?