This may be a good thread to bring up a theory of mine. But first, I must reiterate that visibility, as all ready noted, is dependent on more than distance. That is why serious observatories are located on top of remote mountains. And why we sunburn faster at noon. A few months ago I lost site of a 3M plane in blue sky. There were about five of us watching when it just `blinked out`. Of course I tried to spin down but it never reappeared. A few weeks latter, another flier recounted a similar experience on this list. That got me thinking and I have arrived at a possible explanation. I think we flew through a boundary layer. The temperature is different on each side - as well as humidity etc. That bends the light. We all were looking where (in the direction) we last saw it - not where it actually was. A mirage is the result of such phenomena. Regis
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