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    Re: Refraction at the horizon.
    From: Marcel Tschudin
    Date: 2008 Mar 18, 16:55 +0200

    ... sorry for soliloquising ...
    Just made a check calculation for the second observation. Using the
    standard atmosphere results in a refraction of 49.9 min arc; changing
    the lapse rate between 4000m and 5000m to zero increases (not reduces)
    this value marginally to 50.0 min arc. This can't therefore be the
    reason for the much lower observed refraction.
    
    Marcel
    
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