2 people saw a slow moving very large "darkness" with faint light reflecting off its leading edge.My girlfriend from behind me gasped, saying "What the hell is that?" I looked up without seeing her pointing or anything and saw something definitely designed not to be seen or heard moving slowly over the eastern mountains in a southerly direction then turning gradually to the west. Slow moving. As it passed between me and the stars (very clear night) I noted that it obscured stars from view. Spook-Alley beacons were aiming directly in its direction and didn't reach high enough to illuminate it at all. It appeared as light reflected off its forward edge (but an edge designed not to reflect light). It may have come to a point or been a gigantic disc. If it was travelling at a high enough altitude to be out of the reach of the searchlights it was massive. It may have not been affected as searchlights shined on it and been at a lower altitude.((NUFORC Note: Witness indicates a time of "21:65." We have changed the time to 21:30, which is an estimate. PD))