Certainly every sign has its ruling planet and its rising planet. And almost every planet plays some role in the zodiac. Except one--the Earth. Because the Earth is the seat of human life it neither rules nor rises but is ruled by and serves as the point of reference for the other planets and bodies in our solar system. Therein seems to lie the difference between the astonomical and astrological universes or rather solar systems. In astronomy the sun is the center of the solar system which is one among many in a vast galaxy which is also one among many in a vast universe with the Earth being one among many planets circling the sun. In astrology the Earth is the center of the universe and I have never heard of any influence the celestial bodies outside our solar system have on the zodiac. What influence, for example, does the star Alpha Centurian have on the horoscopes? Or is it that the influence of stars and planets is limited to their respective solar systems? Could the uncharted movements of the moons of other planets and other inter-galactic bodies be responsible for the subtle differences in personality among people who share the same sign but were born at different times and locations?