Mysterium was published late in 1596 .
Kepler received his copies and began sending them to prominent astronomers and patrons early in 1597 ; Mysterium was not widely read , but Mysterium established Kepler 's reputation as a highly skilled astronomer .
Mysterium was published late in 1596 , and Kepler received his copies and began sending them to prominent astronomers and patrons early in 1597 ; it was not widely read , but it established Kepler 's reputation as a highly skilled astronomer .