Galileo Galilei was an Italian astronomer, physicist and engineer, but also an astrologer. It was only recently that his astrological practices came to light, when his astrological ‘Manuscript 81’, entitled “Astrologia nonnulla”, got published in 2016 and is now part of his Collected Works. It contains horoscopes of 19 people in Galileo’s own hand, mostly patrons, students and family members; he was obviously seeking to raise some extra money, as we can see in the entries to his accounting books.
Other evidence of his astrological practices include his first investigation by the Venetian Inquisition in 1604, being accused of practicing deterministic astrology (a heresy, only God knows what is going to come) but he could convince the Inquisition that he was only pointing out and interpreting personal traits of his clients (the Church did not seem to have objected to that), and the case was dropped.
‘Le opere di Galileo Galilei - Testi, Appendice - vol. III’
Galileo facing the Inquisition