I'm guessing light pollution would have an affect on how many he can see as well -- the purple night sky of Metroplis would be a lot different than say... the sky over Smallville.
As for how many stars there actually are, I really don't know :p I always assumed countably infinite til the above posts.
Grant me the serenity to accept the things I cannot change,
The courage to change the things I can,
And the wisdom to know the difference.
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