What is the authoritative Catholic explanation of why the Magi get a pass, yet Catholics are required to reject astrology?
All forms of divination are to be rejected: recourse to Satan or demons, conjuring up the dead or other practices falsely supposed to "unveil" the future [Cf. Deut 18:10; Jer 29:8]. Consulting horoscopes, astrology, palm reading, interpretation of omens and lots, the phenomena of clairvoyance, and recourse to mediums all conceal a desire for power over time, history, and, in the last analysis, other human beings, as well as a wish to conciliate hidden powers. They contradict the honor, respect, and loving fear that we owe to God alone.
It appears that the stars have a knowledge, a science.
What made the Magian astrology acceptable, and would that type of Astrology be permissible to Catholics?
Please see this answer also: What types of signs are given by the “lights in the expanse of the heavens”?