If there were universal laws of astrology, everyone would agree upon what they are (much like everyone agrees that the law of gravity means "what goes up, must come down"). Since it appears that very few people agree on what they are, or even on their very existence, Dr. Tarnas included, how can these be laws?
Before we go any further, I'd like to clarify that when I say astrology, I am really talking about what is known as "esoteric" astrology, which in turn is based on kaballah, which supposedly is a "map" of consciousness. And consciousness contains everything - it
is the universe/"God", time, space, nothingness, eternity, thoughts, memories, the physical world.
I know that different cultures have different mystical beliefs, but within the mystical belief known as kaballah, there are definite principles represented by the spheres on the Tree Of Life, which correspond to the "planets" (bodies) of astrology, and secondary modes of expression for those principles, represented by the signs of the Zodiac. Together, these describe how our consciousness works, and have done for thousands of years. The subconsious mind, for example was understood way before Freud "discovered" it a hundred years or so years ago, and the mental processes of concentration, discrimination, analysis, etc. were all described by the planets and signs.
Not every astrologer has studied the kaballah, or the tarot, which is a synthesis of these principles, put into picture form, and formulated in the 1200s. But most astrologers, if they have studied any occult sources of the subject, give the same associations to specific planets or signs. For example, Mercury is the planet of the intellect, and the signs that it rules, Gemini and Virgo, are highly mental signs. The difference between them is that Gemini rules discrimintion, whereas Virgo rules analysis. I don't think that anyone could confuse Venus and Mars or Jupiter and Saturn - although it's unfortunate that Tarnas didn't describe them very well in the video. As mentioned before, I would have described their symbolism more distinctly.
No, astrology uses "sciencey" language, it does not and cannot contain the "principle of science itself", as the main principle of science is the fact that it is not subject to interpretation...
Maybe I'm not explaining it properly. On the Tree Of Life, there are 3 pillars - a right or pillar of mercy, a left pillar of severity, and a central pillar of mildness. The right hand pillar is the "immaterial" world of light, inspiration, desires, and BELIEF and the left hand pillar is matter, justice and intellect. The scientific method uses our intellects to observe the material world and form theories about laws. It has nothing to do with belief, or personal desires. Scientists might be inspired with certain ideas, but the actual process of science is very much to do with this left hand pillar, which is topped by the sphere represented by Saturn.
Ask any astrologer which planet most represents your sentence "science....is not subject to interpretation" - it's Saturn. The rings around Saturn, by some sychronistic law of nature, represent this limitation of science to strict justice. The language of (esoteric) astrology is not trying to be "better" than science (if that is your concern), it is just, as a philosophy, assigning science to its place in the larger picture.
Much like Dr. Tarnas' embracing of the Gauquelin data, in spite of his claim that astrology is untestable, you are trying to have it both ways by acting as if astrology is a philosophy, but yet still can make claims outside of the philosophical realm. Hence my earlier suggestion to "Stop doing that."
OK, I've stopped!