Approx 4:30AM I went outside to smoke a cigarette in our back parking lot. A crisp clear morning in the city. I was observing the stars and looked directly over head to see a bright as the moon delta shaped object at about 45++ thousand feet, It come into view coming north to south over the roof of my apartment building. It was huge about the 1/5 the size of the moon or looked to be. As soon as I noticed it. It faded to black from the back end of it to the front. Like blackness moving over it until it disappeared and could not be seen against the blackness off the sky. My feelings were shock and my mouth was hanging open. Then immediately I told myself.. Do you know what you just saw? It only lasted a few seconds but all I can tell you is it was moving north to south, delta shaped and the the darkness covered it up from the back to the front even though it was going forward, meaning that shadow that made it disappear moved over the thing in the same direction it was moving.