By 1599, however, he again felt his work limited by the inaccuracy of available data—just as growing religious tension was also threatening his continued employment in Graz.
I 1599 følte han dog igen at hans arbejde blev begrænset af at det tilgængelige data var for upræcist — ligesom en voksende religiøs anspændthed også truede hans ansættelse i Graz.