I'm reading a new book which discusses the role of the medieval view of planetary influences in the Narnia stories. It's really obscure . . . but it makes real sense, particularly in view of Lewis' championing the medieval world-view in The Discarded Image.
I'm only at about chapter 4, but I'll report back.
Sounds fascinating, like the man who analyzed all the alchemical relationships in Harry Potter.
Sounds interesting.