Astrological annual predictions form a consistent literary genre. In recent years, interest in thesematerials among Middle Ages and Early Modern Era historians has been increasing. This thesisspecially adresses the spreading of this kind of predictions in Latin-speaking Europe between1405 and 1484, several centuries after they are firstly mentioned in theoretical sources. Our firstpart explores the internal dialectics of these prognostications, and in particular the strictly-followedmethods of astrological calculation provided as support to the authors’ scientific pretensions. Thegeneral context of production, and the social background of these authors, form a second part ofthe thesis. The third part considers the contemporary reception of these astrological predictions,as well as their unlikely transmission until our days in spite of the genre’s ephemeral nature. Acomprehensive catalogue of the 111 handwritten and 84 incunable latin prognostications preservedin public collections, as well as the 64 astrologers potentially identified as their authors, completethis study. Finally, we offer a critical edition, with French translation and commentary, of the threeknown predictions for year 1405 which, in spite of their individual features, constitute model samplesof the genre.