Summary Nicole Oresme (ca. 1320-1382) was a well-known French author and translator working under the patronage of King Charles V (1338-1380). He commented on a number of Aristotelian treatises as well as producing original texts in Latin or Middle French on natural philosophy, mathematics, astronomy, astrology, economics and monetary theory, theology and sermons. The Traitié de l?espere, written between 1356 and 1377 for the benefit of Charles V and his court, is an introduction to basic physical astronomy (the elements, the spheres, the planets, eclipses, etc.) as well as the groundwork for mathematical astronomy (basic celestial circles ? ecliptic and zodiac, colures, tropics, and the like). The text also includes a study of the habitable areas of the Earth (the various climes) and an interesting chapter on the phenomenon of "gaining" or "losing" a day if one circles the earth, travelling east or west. This is the first critical edition of the Traitié based on the presentation copy (now in the library of St. John?s College in Oxford), collated with the other twelve Middle French manuscripts from the fourteenth and fifteenth centuries. The edition identifies nearly all of the sources quoted in the text, and the various geographical and mythological references. It includes explanations of scientific themes for the benefit of those not familiar with medieval science. An appendix lists possible French neologisms by Oresme found first in this treatise. TABLE OF CONTENTS Preface 1. Nicole Oresme 2. The Traitié de l?espere The purpose of the Traitié The contents of the Traitié The Traitié and the De spera of Sacrobosco The Traitié and the Livre du ciel et du monde The Questiones The middle French 3. The Manuscripts and Editions The manuscripts Ghost reference Editions Translations The base manuscript 4. Editorial Apparatus Editorial principles The apparatus Diagrams Sigla Source References Appendix. Measurements Appendix. Climes Appendix. Phases of the Moon Appendix. Neologisms Bibliography Primary sources Secondary sources Indexes General Index Text Index Summary Nicole Oresme (ca. 1320-1382) was a well-known French author and translator working under the patronage of King Charles V (1338-1380). He commented on a number of Aristotelian treatises as well as producing original texts in Latin or Middle French on natural philosophy, mathematics, astronomy, astrology, economics and monetary theory, theology and sermons. The Traitié de l?espere, written between 1356 and 1377 for the benefit of Charles V and his court, is an introduction to basic physical astronomy (the elements, the spheres, the planets, eclipses, etc.) as well as the groundwork for mathematical astronomy (basic celestial circles ? ecliptic and zodiac, colures, tropics, and the like). The text also includes a study of the habitable areas of the Earth (the various climes) and an interesting chapter on the phenomenon of "gaining" or "losing" a day if one circles the earth, travelling east or west. This is the first critical edition of the Traitié based on the presentation copy (now in the library of St. John?s College in Oxford), collated with the other twelve Middle French manuscripts from the fourteenth and fifteenth centuries. The edition identifies nearly all of the sources quoted in the text, and the various geographical and mythological references. It includes explanations of scientific themes for the benefit of those not familiar with medieval science. An appendix lists possible French neologisms by Oresme found first in this treatise. TABLE OF CONTENTS Preface 1. Nicole Oresme 2. The Traitié de l?espere The purpose of the Traitié The contents of the Traitié The Traitié and the De spera of Sacrobosco The Traitié and the Livre du ciel et du monde The Questiones The middle French 3. The Manuscripts and Editions The manuscripts Ghost reference Editions Translations The base manuscript 4. Editorial Apparatus Editorial principles The apparatus Diagrams Sigla Source References Appendix. Measurements Appendix. Climes Appendix. Phases of the Moon Appendix. Neologisms Bibliography Primary sources Secondary sources Indexes General Index Text Index