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

Stokes, Myra. "The Moon in Leo in Book V of Troilus and Criseyde." 17 (1982): 116-29.
Chaucer adds descriptions of the moon and stars to suggest the slowness of the earthly progression of Troilus and Criseyde's love. He carefully connects Criseyde's breach of faith with the moon's departure from Leo, the sign of the lion previously associated with Troilus. The association of the lovers with planetary motion implies that it follows a similar, inevitable process. Criseyde's association with the planets has a dual significance: Troilus sees her as a guiding star though she is most like the moon. Chaucer follows a similar pattern in his "Complaint of Mars" which, like Troilus and Criseyde, presents loving and losing as necessary. In an appendix, Stokes discusses reasons why the eighth sphere to which Troilus ascends must be the Primum Mobile.