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Air mass: Difference between revisions
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added some facts about the SOFIA flying telescope.
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:* Write a function that calculates the air mass for an observer at a given altitude ''' ''a'' ''' above sea level and zenith angle ''' ''z.'' '''
:* Show the air mass for zenith angles '''0''' to '''90''' in steps of '''5''' degrees for an observer at sea level.
:* Do the same for the SOFIA infrared telescope, which has
:: flying in a specially retrofitted Boeing 747 about four flights a week).
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