I walked outside on deck this morning and was admiring the moon, this extremely bright light was coming across the sky very slow around 100 knots from West to East on a clear sky at around 2500 feet, no locator lights blinking as with general aircraft, I watched it for around 20-30 seconds and went it got near moonlight I went inside to get my binoculars.. That was 5 seconds and when I came back out it had disappeared! There is no possible way at that speed it could have vanished in a clear wide open sky in that short about of time..