I call it the moon vibrations or the moon field, moon magnet, moon pulsation, lunar electromagnetism, so on and so on, the dynamism between moonbodies*........ it seems reasonable to presuppose that a magnetic force operates within and between people's bodies and their psychologies, that differing elements (the signs) combine in different combinations, conduct different attractions, and generate different repulsions etc - astrology only providing the hermetic interpretation for this sub- but not unconscious process.
One can experience the semi-conscious forces accompanying the conscious sphere of experience, and open up the esoteric doorways through the signs as glyphs to the spiritual nature of the psyche.
* The Moon itself is an astral skeleton