The vernacular in medieval astronomy - at Kalamazoo

I recently returned from the International Congress on Medieval Studies.  It's held every year at the University of Western Michigan in Kalamazoo (USA), and this year was the 50th congress.

3000 medievalists met to discuss everything from Viking archaeology to Middle English poetry - and of course there was a mead and ale tasting.  I'll put together some tweets from the congress in a future post.  For now, here's a recording (with PowerPoint slides) of my presentation at the conference.  Hope you enjoy it, and don't forget to comment!