Abstract
Jan Hortensius († 1557), mathematician, astronomer, rector and administrator Utraquist consistory. He was very uplifting Prague University.
Sought to broaden its assets and rights and also tried to improve the discipline of students and teachers. Hortensius was very active in defense matters Utraquists a view to strengthening the role of universities in the religious-political matters.
Published a calendar with astronomical content and planned to build a new map of Bohemia.