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    Re: Kollsman periscopic sextant mount
    From: Gary LaPook
    Date: 2016 Nov 28, 08:46 -0800

    That's the exact same dome refracction table as I posted from the 2017 Air Almanac. The dome refraction is caused by the curveture of the dome which caused the inner and the outer surfaces to not be parallel and this is what causes the refraction. Shooting through normal winshields and aircraft windows (as long as you avoid any curved portion common up by the wing roots) then you have no problem with refraction. 

    gl

       
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