Here's my take on Astrology:
Before, when agriculture was all the rage, farmers used the heavens to figure out when to plant crops. If you planted this crop during Libra and the same crop during Scorpio, they would turn out differently.
Astrology is a big clock. It doesn't control you, but some planets synchronize with certain parts of your life. For example, the planet Saturn. One Saturnal year is 29.5 Earth years. Saturn is the God of the harvest and often associated with one's careers.
Often times, around the time a lot of people turn 29 or 30, they take a big leap in their careers. If they've been doing what they're supposed to be doing, they get a big promotion. One friend of mine was an animator on the Simpson's and around this time of his life, when Saturn Returned, he got promoted to director. When Saturn came back for me, I was unemployed, yet I was nominated for the award I always wanted my whole life.
I'm sure that in ancient times, patterns were noticed among people born at certain times of the year. I have a theory that, depending on how your society and culture works, there are a few patterns that can show up.
I forgot which Malcolm Gladwell book it was, but he was talking about how most Hockey Players are born early on in the year. That's because there's little league hockey try outs once a year, in winter, and the strongest kids are usually the oldest. A few months age difference can determine the tallest kid in the class. And the tallest kid in class is going to feel more confident and that can affect his love life, career, what have you. As opposed to the shortest and born at the end of the year. He might grow taller than all the other kids during puberty, but he'll always feel a little like the scrawny kid who always got picked last on the team. Such factor can affect one's personality, perhaps more so in ancient times when things were less egalitarian.
Also, the lack of sunlight can make a person depressed (forgot the source of this scientific study) Can this subtlety affect the behavior of an infant whose brain is forming in the middle of winter?
I'm not saying that Astrology is a science or it can predict the future. It finds patterns.
An Astrologer friend told me its more about the big picture, not the day-to-day astrological forecasts in the newspaper. Saturn comes around when you're 30. By 27, your brain has completely developed-- your brain is out of the woods from being young and stupid, and it takes some time to realize that-- like 3 years.
Saturn comes back a second time, when you're 60. That's a good time to retire.
Its a clock.
4:00 isn't Siesta or Tea Time because the clock says 4:00. Its time to take a nap or ingest cafine because the way your body naturally works, it wants to take a nap, like everyone else.