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    Re: Basics of computing sunrise/sunset
    From: Douglas Denny
    Date: 2009 Jun 18, 11:27 -0700

     Douglas, I hope this is not something I should be worried about.  I spent
    about 20 of my 32 years in this southern region and I guess I had a good
    deal of exposure to the local sun, but I'd still say it was in limits, being
    aware of the UV-light  issue (am knocking on wood). The ozone hole expanded
    closer and closer to South Africa and may even already have reached the
    "sky" over South Africa in the late eighties when I was growing up.
    
    =========
    
    I do not think so if your vision is still good after 20 years of doing this.
    
    The cautionary way forward though is not to expose your eyes to known 
    potential high intensity radiation in the infra-red or UV, which is what 
    telescopes or binocs do: they gather more light radiation and concentrate it 
    into the fovea.  It does the same thing a surgeon does to seal off 
    micro-heamorrages in diabetes with a laser coagulator.
    
    
    Douglas Denny.
    Chichester.  England.
    
    
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