The grand astrolabe is that big purple sundial looking thing in the base camp near the vendors, if i'm not mistaken. just go to it and press x to activate it, and you should be able to continue on. -elijah darkthorn, legendary conjurer
If you collect all three tokens of the grand astrolabe, it means you have finished Celestia and that you can move on to the Trial of the Spheres. William Crowthistle Legendary Pyromancer
