Large Black Triangle, no lights or sound, south to north, night-time, 3/4 moon, partly cloudyWhile setting up a tent in the back yard with two friends, I noticed movement in the sky out of the corner of my eye. The moon was bright, I believe it was not quite full, and there was a ridge of clouds straight above. I noticed a triangular shape near the south horizon flying due north. At first I thought it may be a flock of Geese, but then realized it was solid black against the sky, with dark grey or brown leading edges, there were no distinguishable lights. I yelled and pointed to my two friends, but they could not locate it before it flew over the ridge of clouds. It took approximately 15 seconds to fly from horizon to clouds, making absolutely no sound. I considered that it may be a Stealth aircraft(such as F-117 nighthawk), travelling extremely slow, until I realized that the ceiling was at least 1000 ft. high, and the craft must have been considerably larger than I first estimated. This event has perplexed me. I am not an avid follower of military aircraft, nor do I believe extra-terrestrial involvement. Since this event I have heard several similar stories, but have kept this description exactly as I told it to my friends the next day.((NUFORC Note: Date is approximate. PD))