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This work presents (in Latin and English) and examines the ""Kalendarium"" of the 14th-century astronomer, John Somer, the reference that Geoffrey Chaucer is thought to have consulted to relate dates, times, and movements of the stars and planets to events in his tales.

This book is particularly helpful for Chaucer studies, for it makes available copies of all Chaucer's sources for his translation: complete texts of Vulgate Consolatio and Meun's translation, along with relevant extracts from the commentaries of Nicholas Trevet and Remigius of Auxerre and collations from the larger Latin and French traditions.