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    Re: Extremely poor conditions, details.
    From: Marcel Tschudin
    Date: 2012 Mar 21, 18:27 +0200
    Alex,

    Next time I will carry a camera and fotograph the horizon
    near the time of the altitude observation:-)

    Please do so and send us your photo from distorted sun ;-) The setting sun is indeed a good indicator of the refractive condition of the atmosphere. At shore you do not necessarily require the setting sun. Select a "standard" place of observation with a distinct feature in some distance (between e.g. 50m to 200m) which allows you to measure (by eye) the relative position of the horizon to it. By repeated observations from the same place you know then the horizon's normal position. This allows you to notice unusual conditions from a shifted horizon.

    Marcel
       
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