There was no sound.I was out in my front yard, about 12 miles south of DeRidder, LA. At between 12:00 and 1:00 am, Saturday morning on May 30, 2008 I was tending to a problem with one of my puppies, then just sitting, looking at the clear night sky.As I watched the great display of celestial lights, I seen a particularly bright flash of light, like a large bright white strobe light. It flashed at regular timed intervals of what seemed to be 3 to 4 seconds, but what was amazing, was the distance it traveled between each flash. The distances varied, and seemed to be from miles, to hundreds of miles, depending on what it's height was, which I could not determine.This flashing and traveling continued in a large circle of what appeared to be from 15 degrees above the horizon, in the south, going overhead, to that same angle in the north, then returning more to the East, and back to the south again, and going out of site behind the trees in my south west. There were about 10 or 11 flashes, in a total viewing time of 30 to 45 seconds.I am a 71 year old retired construction manager, and minister. I am a licensed private pilot.