One of the major tenets of cat astrology has been the idea of the Microcosm/Macrocosm relationship between the feline body and the universe; that there is sympathy between things celestial and things feline (if there wasn't how could you have cat astrology stupid). An added bonus of this reasoning is the relationship of the various signs to parts of the body - correspondences, as we cats call it. So each sign "governs" a part of the body.

CORRESPONDENCES Aries - head Taurus - neck Gemini - front legs Cancer - stomach Leo - heart Virgo - stinky bowels Libra - loins Scorpio - naughty bits Sagittarius - thighs Capricorn - knees Aquarius - ankles Pisces - rear paws