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We just don't know how to measure it yet. That's why the scientific tests aren't finding anything. Science is in its infancy stage when compared to astrology.
I can come up with a list of personal traits and experiences that my chart confirms that someone else's chart never would. And I find it fascinating that while I'm undergoing intensive study of astrology this month, all this stuff is going on with the classification of planets.
Right now, Jupiter is conjunct my natal Sun and square Uranus and Saturn. The immense hard work and exciting developments in my life illustrate this configuration in spades.
Go ahead and laugh. I'll continue to reap the benefits of an open mind.