It contains speculation about their height and speed. You usually can't estimate those things for a UFO because near, low, and slow looks the same as far, high and fast when you have no idea how big it is or how it "should" behave.

Man you're a killjoy, but you can't really say they can't estimate it as you don't know the specifics of what they saw, so there's speculation on your part too. I'd say you get a rough estimate, but you can't know for sure especially at night.

Although in this case if the person thinks it was low, and slow, that's less remarkable than if it was high and fast, because then it would be giant.

Overall, I'd say we're "converging on truth" because of all the reports. Like sparsity, even if each report is incomplete or has innacuracy overall we can build a picture, which is what we're doing. Killjoy. Hahahaha :)

Yea, maybe he had other information that helped. I'm just sensitive to reports of UFOs that include estimates of those derived quantities because people reporting them never say how they worked them out or what assumptions they were making. They could have reported the more directly observed quantities like angular speed instead of linear speed.

I know someone who saw an alien spacecraft landing on a distant mountain. Turned out to be Venus :P