A midweek day off during a heat wave? Time to go outside!
While I hate most infographics, I can’t hate David McCandless. Here’s all you need to know about the sunshine vitamin:
Happy 4th of July!
Useful knowledge for a day in the sun
4 thoughts on “Useful knowledge for a day in the sun”
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graph paper diaries 
Wait a moment… The amount of sunlight is the same in spring and summer and the same in autumn and winter. Temperature is not the same thing as sunlight.
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I wonder about both sons living above the Arctic Circle. I tend to be opposed to vitamin supplements, but do wonder if extreme situations warrant them.
OTOH, they both eat a lot of fish these days.
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From what I can gather, they factored temperature in because of the average amount of clothing people wear. More exposed skin means less time in the sun needed.
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@Joseph,
the solar energy striking the square inch of earth (or skin) varies over the year.
The variance is small but measurable; it relates to the angle-of-incidence of the sunlight. (The angle is much better in summertime than wintertime, due to the Sun's apparent movement towards the North sky in the summertime.)
However, I suspect the variance in recommended times is split between this answer and BS's. Both factors are in play.
On another front, my hometown (Metro Detroit) is at 42.3 N latitude. Is that far enough from the line to be worrisome? Maybe some more detailed research is in order.
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