He was a member of this College in the time when Galileo Galilei was in Rome (1611) to state his case in the question of Heliocentric and Ptolemaic systems.
After a short career as a Professor of Mathematics in Graz and later in Coimbra, Portugal[1] Kirwitzer leaves with other brothers (among them Nicolas Trigault) for China as a missionary.
[3] After some time in Goa he moved on to China and finally to Macau where he died on May 22, 1626[4] (other sources consider Kyoto /then called Meaco/ as the place of his death[2][5]).
He didn't stop being interested in astronomy, he kept in touch with Johann Adam Schall von Bell, a German Jesuit that was preparing the reform of the Chinese calendar and later became president of the Astronomical Office in Beijing.
His observations of comets were published in Observationes cometarum anni 1618 factæ in India Orientali a quibusdam S. J. mathematicis in Sinense regnum navigantibus in Aschaffenburg in 1620.