Political and religious difficulties in Graz dashed his hopes of returning immediately to Brahe; in hopes of continuing his astronomical studies, Kepler sought an appointment as a mathematician to Archduke Ferdinand.
Politiske og religiøse vanskeligheder i Graz knuste hans planer om at kunne tage tilbage til Brahe med det samme; i håb om at kunne fortsætte sine astronomiske studier søgte Kepler som matematiker audiens hos ærkehertug Ferdinand.