Over Salvo, N.C. - Disc shaped objsct moving in circles, forward & backward on the drop of a dime, Very high in sky. No sound.While on the deck of my rental home (beach side)& looking south, I was looking very far up into the sky & I was watching what I thought was a plane/jet very high up. No clouds were near to where I was watching this craft move. It was moving straight across the sky at about the pace a jet would move & was moving bay side towards the ocean. I then saw it move in a circular motion & then forward again. After moving forward for another 10-15 seconds it then backed up without turning & then moved forward again. This happened very fast. Normally a jet will make a sound, this was silent. I was amazed at the motion & at that point I realized this was not a plane or jet. I watched for another 20 seconds & the object just vanished. I kept looking waiting to see it again but it never returned. There were no clouds for it to go behind. * that evening our neighbors, my friend & I saw more in the sky - I am filing another event report for that.