UFO: I was on the roof of a friends apartment with 5 other people. We all witnessed this event.

[Robb]

34. The reason eyewitness accounts of unknown flying things are so problematic

...has nothing to do with the eyewitnesses themselves. Or whether or not they're drinking or smoking.

The problem is that in order to know an object's size, distance and speed at all, you need to know one of those values in advance. Otherwise the mind conveniently makes up a value for one of them and calculates the rest on bad data.

For example, when you see a helicopter flying "fast" some distance away (you guess), you're probably on track because you have some idea how big a helicopter is. When you see a swallow darting past, you don't think "that's a supersonic airplane in the distance" because you recognize the bird.

However a "light in the sky" is predictably impossible to gauge -- it could be a bright, distant light, or a much nearer, less bright light, or nearly any size -- in fact so much so that the phenomenon has been used in deceptive warfare since the event of air power.

That said, I of course have even less idea what you might've seen than you do. But thanks to the "fill in the gaps" power of the brain, I'd say it almost certainly was not the size, distance or speed you thought it was.