i use the 20 year generational divides to understand a lot of things, but I didn't know it had an actual planetary background. 

lots of  babies are born on the full moon. so i know the moon cycles do have some very obvious effects on humans.

the astrology stuff is a little less predictable but i have noticed personally that I tend to date  anyone born in late August/early September timeframe, and close friendships with people in late February/early march.  I don't know if I just imagine similarities between characters and birthdays to help me understand people and I ignore all the exceptions, or if there really are similarities.

fun to think about. 

 yeah, not saying it's deterministic, just that on quite large time scales the patterns are still happening, and probabilities work

probably the meaning imputed by much of the various versions of astrology are quite incomplete and inaccurate though 

 i agree with that last statement. that's why it's probably recommended to be avoided because you'd have to be God to see how all the factors align to create just such a version of someone. 

 yeah, i think the most important things are the big patterns like the motions of jupiter and saturn and our position in the galactic spiral arms relative to our yearly cycle, etc

and definitely lunar cycles directly affect us, shielding or drawing energy from the sun towards us and deflecting it

but yes, way too complex to be able to boil it down to better than fuzzy probabilities