3 ms·
What I do is stay out of the sun from 10-2.
by skookumchuck 8y ago
What I do is stay out of the sun from 10-2.
- fouc 8y ago10 to 4 you mean? Solar noon can vary a bit, such as 12:30pm to 1:30pm (depending on DST also).
- tgb 8y agoI don't think that helps significantly. Check out the plot on Wikipedia [1] for the ultraviolet index in NYC. At peak on summer, solar noon versus 8am there's a factor of ~3 difference between UV incident on a horizontal surface. Since the sun is much lower at 8am, that factor is primarily from the surface being at an oblique angle to the sun. So atmospheric absorption is significantly smaller than a factor of 3 and since much of the human body is not oriented horizontally, that's the part I'd want to be considering. Either way though, SPF of at most 3 is insufficient. [1] https://en.wikipedia.org/wiki/Ultraviolet_index https://en.wikipedia.org/wiki/Ultraviolet_index