Alexander made use of astrology :

It has always been understood that Alexander made use of astrology throughout his campaigns, though whether because he believed in it, or knew that others believed, and took advantage of the fact, is far from clear. It seems unlikely that he almost alone among educated people of his time placed the influence of the planets at naught — although one or two philosophers did so: Eudoxus (c 408-355 BC), for instance, the inventor of the geometrical theory of proportion, who demanded that ‘no credence should be given to the Chaldeans, who predict and mark out the life of every man according to the day of his nativity’. And the Greek Academy under Carneades and Clitomachus, in the 1st century BC, was to set itself firmly against divination, magic and astrology.