 In 1589 , he was appointed to the chair of mathematics in Pisa . In 1591 , his father died , and he was entrusted with the care of his younger brother <unk> . In 1592 , he moved to the University of Padua where he taught geometry , mechanics , and astronomy until 1610 . During this period , Galileo made significant discoveries in both pure fundamental science ( for example , kinematics of motion and astronomy ) as well as practical applied science ( for example , strength of materials and pioneering the telescope ) . His multiple interests included the study of astrology , which at the time was a discipline tied to the studies of mathematics and astronomy . 
