Elemental Uranian Astrology

Fire, earth, air, and water comprise the four elements typically found in Western astrology. But why are there four elements, why not eight? What about elements we can perceive but not see? And the Uranian planets, how do they fit into this, what element would they be most like? In this show I'll be taking your questions on the phone or chat in addition to breaking down the planets and elements in astrology.