There seems to be very plausible reasons supporting each of these ideas. Sagittarius is also mentioned as having association because in mythology, Chiron was a centaur and teacher. Newcomers and novice students are advised not to embrace new theories in astrology too quickly. Indeed, there may be missing planets. If you want to pursue the study of Chiron further, go to Zane B. Stein's extensive work on Chiron or Chiron, An Overview by Candy Hillenbrand.
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