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.