Confirmation bias (also called confirmatory bias, myside bias or verification bias) is a tendency of people to favor information that confirms their beliefs or hypotheses.
I see unexplained behavior.
I seek new information.
That new information explains the behavior.
Sounds more like the scientific method than confirmation bias to me.
wrong. science involves explaining behavior through models.
1. unexplained behavior
2. form hypothesis about correlation/causation between two variables
3. verify if causation holds given the evidence
there is no model here besides 'stars affect personality types'. this hypothesis needs to be tested. furthermore, unless a mechanism can demonstrate causation, it is a correlation at best (think ice cream sales and drownings).
your bias is assuming the model, and therefore focusing on the predictions of astrology that 'fit' your common sense (and most likely disregarding far more than you realize)
1. Unexplained Behavior: Girlfriend is bitchy.
2. Hypothesis: Perhaps she is dealing with some energy she is having a hard time with, which is making her bitchy.
3. Verify causation: 3 planets that have conflicting energies are currently all in the same sign, which happens to be associated with the mind, and which is also highly crowded in her birthchart, I can compare to my birthchart and how I feel to understand the differences.
From this, I choose to approach her with more sympathy and understanding. As a result of my change in action, she has more energy to deal with the conflict within her and gets over her bitchiness quickly. This is a real example of how astrology has improved my life.
Perhaps I'm just a dick and she's responding to me showing the tiniest bit of sympathy, but I'm sure you can see why I prefer the other explanation.
My means may be invalid, but I don't care because I get the results I'm looking for.
Also, to all those who keep mentioning astrology being 2000 years out of sync, learn to read. I already addressed that in my first post in this thread. I am referring to Vedic Astrology, which is accurate in present day because it accounts for precession.
. But, the reality is, people believe in it. That would explain it being found in limited areas, but not seen overall. I wish I could find a study that took place in rural India, or another place where astrology is highly regarded. 
