Staff of Ra headpiece is up for auction.

What exactly is the headpiece to the staff of Ra?

Well the staff is just a stick-I don't know about this big. Nobody knows for sure how high and its capped with an elaborate headpiece in the shape of the sun with a crystal in the center. And what you did was you took this staff to a special room in Tanis, a map room with a miniature of the city layed out on the floor and you put it in a certain place at a certain time of day and the sun shone through here and made a beam which came out on the floor here--and gave you the exact location for the Well of Souls.

Where the Ark of the Covenant is buried right?