Invisible wrote:

> Apparently it's 0.00854446724 degrees, which is about 30 seconds. That's 
> some pretty fricken tiny angle!

According to Wikipedia:

"20/20 is the visual acuity needed to discriminate two points separated 


So I guess 30 seconds (0.5 minutes) could plausibly be within the range 
of normal human vision then.

I just noticed the other night that as I passed under a sign telling me 
the motorway exit was in 1 mile, I could already see the green traffic 
lights beyond the exit. And those lights can't be much more than 24cm 
across...

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