They don't even use Uranus and Neptune that I've seen - just the planets visible to the ancients.
You all will have to just to hash this out. I could have swore that my mom's Cosmopolitan magazine's astrology section growing up always mentioned Pluto....I know for a fact that they talked a lot about Uranus.
(Dice Clay takes cig out of mouth to proclaim: "OHHH!!")