Hell's bells, that's a good idea! Let's classify every belief as a complex number (magnitude 1) with a real and imaginary part!

Astrology: (0 + j1) - {imaginary but vaguely intuitive}

Aliens have visited earth: (2^-1/2 + j2^-1/2) - {intuitively possible, imaginary but with finite real component}

Michelson's prediction of aether wind effect: (-1 + j0) - {simply, honourably wrong}

Elan vital: (0 - j1) - {"not even wrong"}