Which Came First, The Treatise or the Astrolabe?

Here's an interesting article about astrolabes that were supposedly owned by Chaucer, and the argument that astrolabes of that design were probably based on Chaucer's Treatise on the Astrolabe, rather than the other way around.

By the way, I am typing this on the computer used by Bill Gates to design Windows. I know this fact because my Windows operating system works much like the way Gates described it.

h/t Roving Medievalist