The astronomical body, Chiron (once thought to be a comet or asteroid, now considered a "planetoid" or small planet-like body) is named after the ancient Greek, centaur demi-god who was horse from the waist down and human from the waist up. Chiron's orbit, unlike that of the asteroids, lies between Saturn and Uranus, and is irregular in that it occasionally crosses inside the orbit of Saturn. This astronomical characteristic is symbolic of Chiron's reputation for being somewhat of a maverick.
Psychologically and astrologically, Chiron's placement in the horoscope indicates one's experience of the wound that does not heal, (or the wound that does not seem to heal, because although an important lesson may be learned through dealing with it, the wound seems to spiral around with another lesson on a deeper level). Chiron represents one's experience of woundedness and the nature of the wound. Most often, this is a pattern of behavior-and-response learned through early childhood: often the result of parents dealing with their own issues and unaware of our own needs as we grew up.
Second, by coming to terms with suffering through an acceptance of one's mortality, one arrives at a greater state of wholeness or healing. Third, Chiron shows how one comes into one's own as an elder or mentor who can provide healing and guidance to others. Thus Chiron also astrologically indicates the ways and means with which you can guide others, as well as the kind of mentoring and healing you seek for yourself.