Why do all these articles spell the moon astrologers refer to as “Chiron” as “Charon?”
Because astrology is complete bollocks and astrologers don't have the slightest clue of what they're talking about.
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?