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Assuming I'm standing in the middle of the ocean with a large telescope, positioned such that it's angle is 90 degrees (i.e, it's parallel to the sea) and assume that there are no light interferences and such -

What will I see?

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You'll be pointing at the horizon, and as a result, your scope is viewing the sky through about 11 zenith air masses resulting in significant atmospheric extinction. Further, you'll be viewing objects about half a degree below the horizon due to refraction. – Michael Luciuk Sep 5 '12 at 21:03

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