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

Olson, Donald W., and Edgar S. Laird. "A Note on Planetary Tables and a Planetary Conjunction in Troilus and Criseyde." 24 (1990): 309-11.
The conjuction Criseyde describes in Book III of Troilus and Criseyde matches exactly an actual conjunction that occured between May and June, 1385, as study of the Alfonsine Tables shows.