On 14 March 1609, he entered Holy Orders as a Deacon. He was ordained by suffragan bishop Marcus Lyresius. Scheiner finished his studies on 30 June 1609 with his first work, "Theses Theologicae" and with a disputation (PhD in theology). On 18 April 1609, he received his major orders from suffragan bishop Lyresius in Eichstätt, from where he went to Ebersberg to serve his tertianship with Father Johannes Pelecius S.J. In the years between 1610 and 1616/1617, Scheiner worked as a successor to Father Johannes Lantz S.J. in Ingolstadt, teaching mathematics (physics and astronomy) and Hebrew. He lectured on sun dials, practical geometry, astronomy, optics, and the telescope.