He published numerous works mostly based on Copernican theory, most of which either did not survive to our time or are known only from single copies held in Jagiellonian University's library.
Among them were a treatise Poprawa kalenarza (now lost, possibly written in Latin), as well as Kometa (Comet, published in 1596) and De mutationibus regnorum tum observationibus quoque in ecclipses atque Cometas aliquot.
While most of the academy approved of the reform plan, Latosz presented a different solution through his old acquaintance Alberto Cardinal Bolognetti, former Papal nuncio to Poland in the times of king Stephen Bathory.
In addition to that, the calendar question in the Polish–Lithuanian Commonwealth became strongly linked to the struggle between Catholic, Uniate and Orthodox magnates, the latter arguing against the reform for reasons of tradition.
Latosz moved to Ostrog, where he became the personal physician to Prince Konstanty Wasyl Ostrogski, one of the most influential people in eastern Poland of the time.