18.1 Activate the first Owl Statue
After restoring Ilia’s memory, descend into the basement. Talk to Shad by the Owl Statue and show him the Ancient Sky Book. By reading it he accidentally restores power to the Dominion Rod. However, the Owl Statue still cannot be moved. He marks the locations of other statues on your map and leaves to investigate.
There are six Owl Statues in total. Four can be found throughout Hyrule Field, another is in Faron Woods and the last one is in the Gerudo Desert. Moving them with the Dominion Rod reveals the missing characters from the Ancient Sky Book. The order listed here is only a guide; you can tackle them in any order you like.
18.2 Find the remaining Owl Statues
The closest Owl Statue is east of Kakariko Village, near Kakariko Gorge. If you see Chu Chus on the ground you are getting close. Move the statue and check the markings underneath it to recover a missing character from the Ancient Sky Book.
Search for a small series of ruins near the southern edge of Gerudo Desert. The Owl Statue is on top of them. There is only one ledge low enough to climb up, so position the statue so that you can jump onto it to reach the missing character.
18.3 Ride the cannon to the sky!
Return to the basement of the Sanctuary with the filled Sky Book and show it to Shad again. When he reads it this time it will enable you to move the Owl Statue. On the other side is a cavern containing the broken Sky Cannon. You can try to warp with it, but Midna suggests that you get rid of Shad before you transform into a wolf. Talk to him to make him leave, then warp to Lake Hylia with the Sky Cannon.