Rhetorius, chapter 86. Astrologers or Diviners.
“If Mercury chances to be in a good house, and especially in a domicile of Saturn, not under the Sunbeams and aspected by Jupiter and Saturn and Mars, it makes astrologers, diviners, or priests.”
This is my own chart. I have Mercury in a domicile of Saturn, in angular sign, in conjunction with Jupiter and in aspect to Mars and Saturn (separates from the first and going toward the second, received by both). Well, I am an astrologer lol
Note also that Mercury is aspecting the MC (workings/actions) very closely (applying toward the MC). I am currently at Mercury Firdaria on first level. This is the time when I passionately study astrology. Jupiter is L9 [the house of astrologers] and is in conjunction with Mercury.
“And if Saturn chances to be in the ASC in a domicile of Mercury, or if Mercury is in the ASC, it makes infallible astrologers.”
I know of a very good astrologer (also traditionalist) who has Saturn and Mercury in Virgo on the Ascendant.