A semi foggy night (could see bright stars but not faint) I was out using my newly purchased night vision monocular (Yukon digital 'Ranger') to look at stars. Not seeing much towards north or east, I pointed west where I was able to see better.Looking just over the tree line at about 250 degrees west and about 20 degrees high I saw a bright light appearing in the viewfinder (brighter than the background stars). The 'light' traveled towards me extremely fast from west to east (250 degrees west towards 160 degrees east) and moved slightly up then down.The object covered about 1/5th of the sky in about 5 seconds and at about 60 degrees high made an extraordinary U-turn, almost a 180-degree turn around in 1 second or less. The object, as quickly as it is approach, retreated on the same path it came. I was able to track it down to near horizon through the trees with night vision monocular. All this lasted about 15 seconds.Summary: This was REAL and in no way a plane, meteor, rocket, military or other heavenly body. Skeptic before, I'm convinced I saw something out of this world. Nothing of our technology could move that fast and make an impossible U-turn as I saw.