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Annual astrological calendars, practica and prognostications becamewidespread publications in Europe after the invention of printing presses inthe 15th century. Using the national language instead of Latin, the language ofthe scientists, the motion of sun, moon and planets were explained and used toforetell weather, growth of fruit, diseases, war and misfortune. By this meansastronomical knowledge became accessible to everyone capable of reading.  A milestone in the context of position calculations of bodies of our solarsystem was the publication of the Copernican system in 1543. When VictorinusSch\"onfeldt started his studies at Wittenberg University he was educated inthe so called "Wittenberg Interpretation" of Copernicus. In 1557 Sch\"onfeldtbecame professor of mathematics at Marburg University and in 1566 headditionally was given a professorship of medicine With the help of histeachers and mentors in Wittenberg Sch\"onfeldt was introduced to the court ofthe landgrave of Hessen in Marburg and became a close friend to the noblefamily. To Wilhelm IV., landgrave of Hessen-Kassel from 1567, he served notonly as one of the personal physicians but as a scientific counselor in thelandgraves' astronomical studies.  Presumably right after being appointed a professor of mathematicsSch\"onfeldt began to write his "\emph{Prognosticon Astrologicum}", a series ofannual books, that he continued until his death. He made use the Copernicansystem for his calculations, comparing them occasionally with calculationsusing new Ptolemaic based ephemerides and in his last almanacs withcalculations based on Tycho Brahes' model.

Victorinus Sch\"onfeldt (1533 - 1591) und sein "Prognosticon Astrologicum"