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Author Topic:   Skin colors and latitude
Coragyps
Member
Posts: 5551
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 5 of 65 (97593)
04-03-2004 9:50 PM
Reply to: Message 3 by moelarry
04-03-2004 6:07 PM


How about maybe that the selection only really works to make people living further north develop lighter skin, so that they can make the Vitamin D they need in the pale winter sunlight there? Maybe there's no real need to darken up if you're light skinned and move back to the tropics.

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Coragyps
Member
Posts: 5551
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 22 of 65 (160094)
11-16-2004 12:33 PM
Reply to: Message 17 by macaroniandcheese
11-12-2004 12:25 PM


plus. you want ambient uv? go to the north pole.

Actually, there's not that much UV in the arctic. The amount of UV that gets absorbed by the atmosphere goes up very quickly with decreasing altitude, and the Sun never gets higher than 46 degrees even at the Arctic Circle - only 23 degrees at the poles.

I don't know if the details of this are online, but it was published in Sky and Telescope maybe ten years ago. The article might even be entombed in a box in my garage.


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Coragyps
Member
Posts: 5551
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 45 of 65 (161211)
11-18-2004 5:15 PM
Reply to: Message 42 by MangyTiger
11-18-2004 3:56 PM


Re: Getting a tan
As I understand it this is a very recent phenomenon driven by the advent of colour film in Hollywood in the thirties

My mother will attest to this: her grandmother would scrub her down with hydrogen peroxide when she went to Missouri to visit. "Child, you look like a gypsy!"

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