From Astro (Greek, "star") Logos ("the Word"). In esoterism, the Logos is the primordial intelligence that creates ("...and God said, Let there be light...") therefore, esoteric astrology is the study of the Word (Logos) in relation to the stars (astro), in relation to the heavens, and how the Light of the Logos as it descends through all the layered condensations of matter and energy (symbolized in the Kabbalah) influences all phenomena.
"Astrology is a science which goes back to the time of the first ages of humanity." - Samael Aun Weor, Occult Medicine