"That, we know... you can find the ruins, still," Evendiss said.<br/><br/>Upon inquiring at the Library, they would be directed to the astronomers at Tephu’s observatory, the Eye of the Heavens, who would keep detailed records of the sunrises for every day, since the founding of Tephu.<br/><br/>With the location of the sun, and the height and location of the tower, it is a simple DC 30 Knowledge (engineering) check to calculate where the shadow of the tower would point.