Richard, I know the exact feeling you may have experienced. In 1984, a buddy and me were on our last night of a 10 day backpack trip in King's Canyon Nat'l Park. We were just sitting around the fire and then walked out into a meadow so we could see the stars better. My friend pointed out a flashing light that zigzagged across the sky from horizon to horizon in about 15 seconds. Even though there were canyon walls which were fairly low on the horizon, the object moved along the length of the canyon from about due west to east. I visually picked it up about 30deg above the W horizon and watched it zigzag overhead and then move off to the E horizon. It was bluish-white in color, and flashed about once a second. You could actually see the zigzag pattern it made as it flew overhead. It was not a solid craft... just a flashing light, and it appeared to be extremely high in the atmosphere... almost like a satellite. As we watched it, we asked each other what the hell it was. But when it passed directly overhead, we stood there speechless, and then, I suddenly had a very strange feeling that it was intelligently controlled and it aware of us watching it. After it was gone, we tried to explain it away. I am a strong believer in science and I always try to explain these types of things with a logical answer. But there appeared to be no natural phenomena or man made craft that we could think of to explain what we saw. To this day, I still have not a clue what it was. Jon Richard Wrote: I'm enjoying the suggestions. My thoughts also ran to some kind of military stealth craft. I already dismissed the thought of birds -- it did not appear to be reflected moonlight, there were definite (albeit faint) lights visible. The speed really surprised me -- it was only visible for a few seconds. One of those interesting moments in which the 3 of us who witnessed it were completely baffled, and even a little freaked out. Quoting utah-astronomy-request@mailman.xmission.com:

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