Doctors use scientific tests, but they disagree amongst themselves. Conflicts of opinion over the astrological meaning of a newly discovered planet arise from time to time. It took probably 30 years before the majority of astrologers agreed on what Pluto was really about, and deeper insights are always being published. Agreement by consensus, built on arguments that utilize anecdotal evidence, is how Western astrology has moved forward. Only a few truly scientific studies bolster the contentions of this field of inquiry.
Mesoamerican astrology is impoverished by comparison.
Those of us interested in this field are few, our resources limited, and most don't have a background in Western, Hindu, or even Chinese astrology. Most who are interested in the field know intuitively that something of incredible value exists among the remnants of the great Mesoamerican civilizations. We are drawn to the relics of a fantastic astrological system that no one really knows exactly what it was like when it was full-blown. We need to take the time to educate ourselves about it, and about other parallel systems from other cultures. We need to get into a the astrological mind-set, a world where symbols are not fantasy, they are a code for they way things work.