Yuriy Drohobych

Yuriy Drohobych or Yuriy Kotermak, (Latin: Doctor Georgius Drohobich, Ukrainian: Юрій Дрогобич, Polish: Jerzy Drohobycz, Jerzy Kotermak Drusianus, Georgius Drohobicz, by birthname Yuriy Kotermak, Giorgio da Leopoli) (1450 in Drohobych - 4 February 1494 in Kraków) was a Ukrainian philosopher, astrologist, writer, medical doctor, rector of the University of Bologna, professor of Kraków Academy, first publisher of a Church Slavonic printed text. He is the author of Iudicium Pronosticon Anni 1483 Currentis.

Yuriy Drohobych was born in the city of Drohobych in Red Ruthenia, or Ruthenia Rubra (modern day West Ukraine), to a family of a salt maker. He received his primary education in the local parochial school and after that he studied at a lyceum in Lviv (Polish: Lwów), or Leopolis, in Ukraine (then Palatinatus Russiae of the Kingdom of Poland).

In 1468 Yuriy Drohobych entered the Jagiellonian University (Uniwersytet Jagielloński) in Krakow. Two years later he received his bachelor's degree and in 1473 his master's. He taught during the summer months and participated in scientific discussions on Saturdays and Sundays. After he gained some significant achievements in Krakow, Drohobych traveled to Bologna University, where natural sciences and medicine were gaining popularity. Here he improved his Latin, learned Greek, and continued his studies of natural philosophy. He paid special attention to his studies in astronomy. It's worth noting that Drohobych's astronomy professor was Girolamo Manfredi, one of the most renowned astronomers in 15th century Italy. Manfredi introduced his promising student to German astronomer Johannes Müller (Regiomontanus) who believed in heliocentrism; however, it had not been mathematically proven at that time.

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