Actually, one of the best times to pick out constellations like Scorpio is when there is a full moon or a slightly hazy sky. (Or, in my case, when I have not yet switched off our mercury vapor security light.)
Although the Indians in the desert southwest didn't have time exposure cameras, they certainly had views of amazingly star-rich skies. OTOH, they had the same moon as we do -- and under those "light polluted" conditions, Scorpio does look very much like a scorpion...
Yes, I wasn't trying to hide the time-exposure factor but perhaps should have made a specific statement.
Trouble is, that image doesn't look all that different from the night sky in rural areas when I was a kid.
And I haven't seen any image of that region of the sky that looks like a scorpion.
And (again see my post 37 and I have more) the myths and names are too similar in my view for anything by contact or continuity.