The Chaucer Review: An Indexed Bibliography (Vols. 1-30)

Eisner, Sigmund. "Canterbury Day: A Fresh Aspect." 27 (1992): 31-44.
References in the text clearly indicate that the pilgrimage to Canterbury took place on a single day. Given the information in the text, and in the Equatorie of the Planetis, the Treatise on the Astrolabe, and Nicholas Lynn's Kalendarium, the date and year of the pilgrimage can be fixed as April 18, 1394.

Eisner, Sigmund. "Chaucer as Technical Writer." 19 (1985): 179-201.
Chaucer's Treatise on the Astrolabe shows his ability to communicate technical information to readers at all levels of knowledge, especially when compared to his contemporaries who wrote for those already possessing a basic knowledge of the subject. When translating, Chaucer adds specific details to the original work as he did when he translated the Livre de Melibee et de Prudence. Such details allow Chaucer to teach by example and to help his readers to remember the information.