Here’s a quote from Chapter 2 of Synchronicity: “I formed the opinion that astrology is of particular interest to the psychologist, since it contains a sort of psychological experience which we call ‘projected’ - this means that we find the psychological facts as it were in the constellations.”
Where he was describing his faith in and use of horoscopes.
"Since you want to know my opinion about astrology I can tell you that I've been interested in this particular activity of the human mind since more than 30 years. As I am a psychologist, I am chiefly interested in the particular light the horoscope sheds on certain complications in the character. In cases of difficult psychological diagnosis I usually get a horoscope in order to have a further point of view from an entirely different angle. I must say that I very often found that the astrological data elucidated certain points which I otherwise would have been unable to understand. From such experiences I formed the opinion that astrology is of particular interest to the psychologist, since it contains a sort of psychological experience which we call 'projected' - this means that we find the psychological facts as it were in the constellations."