Chart of the Day: Bodily Exposure at Different Solar Azimuth and Altitude

This is the kind of chart I adore, depicting the solar exposure of a human body at different varying degrees of azimuth and altitude. It comes from a book called Principles of Environmental Physics that I found in a free box.

Herewith:

sunbeam-human-body

Consider it a PROTIP for summertime sunburns! Don’t say I didn’t warn you.


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2 Responses to Chart of the Day: Bodily Exposure at Different Solar Azimuth and Altitude

  1. Mike Hicks June 11, 2015 at 3:25 pm #

    That’s….not what I expected based on the title. Funny, though!

  2. David Markle
    David Markle June 12, 2015 at 6:44 pm #

    Azimuth and altitude here refer to sun angle, not the same as geographic altitude. Exposure to UV is much greater at high geographic altitudes, due to less atmospheric blocking/filtering. On my treks in the mountains I wear a broad-brimmed felt hat, a shirt and pants that have a good SPF rating, and put sun block on the lower part of my face. Several years ago I spent three days on a high ridge above 12,000 ft wearing a balaklava because of strong winds; forgot to apply sun block to my nose and for the rest of the week looked like I’d gotten too close to a charcoal grill.