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Wei_Dai comments on Metaphilosophical Mysteries - Less Wrong
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Ancient humans used the stars in the night sky as a compass to navigate by, so it would have been selected for. That said, I think (1), that astronomic ability is almost universal in eye space, is true. (At least for eyes that can see predators and obstacles in the dark, which much more strongly selected for than being able to navigate by starlight is.)
Huh, not sure. If I look at the sky with my left eye without wearing my glasses, I can barely see the stars, but I'm pretty sure I could see predators.