Was outside in the backyard. Not a cloud in the sky....clear and chilly. As I have seen many unusual things in the past, it is cutomary for me to always check out the sky. I noticed 4 very unusual, "fireball" orbs coming toward the house from the SW. Wondering what in the world they could be, I watched them for about 1 1/2 minutes, at which point they ALL "brightened" considerably, and then it was obvious that they were large, traingular flying objects. They proceeded to "gather together "(that is the best way I can describe it), and then each immediately took off in different directions......1 to the North, 1 to the East, 1 to the West, and 1 to the South! As there is not a cloud in the sky tonight, it was a VERY CLEAR sighting. These triangles moved INCREDIBLY fast, as well! (MUCH faster than the airplanes which you could ALSO clearly see flying!) After observing these triangles (after they "brightened "and then became traingles), they flew incredibly fast out of sight.