FYI, Chiron in astrology refers to a comet, or planet [sic] discovered in 1977; in astronomy it is a Centaur asteroid/minor planet/comet (it brightens when nearer the Sun), the first of the Centaurs to be discovered. Another online source for astrology states that Chiron was originally a star in the constellation of Centaurus, probably that’s the source of the astronomers’ name for that family of asteroids?
Charon was the ferryman of Hades in Greek mythology, so his association with Pluton [a euphemism the Greeks used for Hades similar to the way we used to use "Heck" for "Hell."] The Romans just stole the name, although they used "Pluto." IIRC, Charon has the same name in Roman as in Greek mythology.
Anyway, the similarity in names in English is misleading. In Greek, Charon starts with a κ, and is pronounced pretty much like "Karen" or "Karon." Chiron starts with a χ. χ is a "trilled K," not a hard K, and is done farther back in the throat, it's like a cross between the ch in church and a k.
I doubt all astrologers actually confuse the two. No doubt some do.
Still complete bollocks.