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    Re: Refraction
    From: Fred Hebard
    Date: 2005 Aug 4, 12:50 -0400

    Marcel,
    
    OK, I got it.  Ignore my last post.  You might want to look at the
    Introduction to the Air Almanac, which should give instructions for its
    use, and should discuss this case.  I've never seen a bubble sextant,
    so I don't know whether they measure negative altitudes.
    
    Fred
    
    On Aug 4, 2005, at 12:20 PM, Marcel E. Tschudin wrote:
    
    > Yes, how do I get in this? Just trying to cover in a self-made program
    > the
    > situation from an object at the horizon (over sea level) as seen from a
    > mountain or air craft.
    
    
    

       
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