A nearly identical version of this paper was delivered at the 30th Annual International Conference on Medievalism in Pittsburgh, Pennsylvania on October 2, 2015, as part of a session on the Inklings and Medievalism.
"Medieval Cosmology and Middle-earth: A Lewisian Walk Under Tolkienian Skies,"
Journal of Tolkien Research:
1, Article 5.
Available at: http://scholar.valpo.edu/journaloftolkienresearch/vol3/iss1/5