[1] Jan Muscenius was born in Kurzelów, Sandomierz Province, and lived in Kraków.
In 1550, he enrolled in the Faculty of Liberal Art at the Kraków Academy (now Jagiellonian University).
The University of Warsaw Library has 59 beautifully bounded volumes from the Muscenius collection.
The observations showed that the mathematical method of the planets position calculation presented by Copernicus in De revolutionibus orbium coelestium are more accurate than previously used the Alfonsine tables and Albert Brudzewski tables.
This result popularised to use the numerical values of the planets position according Copernicus, but not necessary to Copernican heliocentrism.