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Thanks Douglas, your advice is much appreciated.

Regards,

Christian Scheele

----- Original Message -----
From: 
To: 
Sent: Thursday, June 18, 2009 8:27 PM
Subject: [NavList 8702] Re: Basics of computing sunrise/sunset



 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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