Mapping light eyes

October 7, 2009 at 12:27 am | Posted in genetics, Maps | Leave a comment
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Thanks again to my friend Xarxes, I saw that curios map about the distribution of light eyed people around the European continent. Blue eyes are so wonderful for dark hazelnut eyed people like me, that the map caught my attention immediatly. See how bad distributed are they? Nordic and Central Europe people got them all, dammit!

By the way, and speaking a bit more seriously, my eyes went straight to the Arctic Circle line, and I noticed the highly diferenct percentatge between Sami land (Lappland) and the other Nordic zones. Interesting, right? The genetical diferences show them here too!

(Seen by my friend in Deixant rastre)

Sundog Light Phenomenon in Manitoba

July 21, 2008 at 6:22 pm | Posted in Photography, Wheater | 1 Comment
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I just received this at my inbox from National Geographic:

Photo shot on assignment for, but not published in, “Refuge in White: Winter in a Canadian National Park,” December 2005, National Geographic magazine

A solar phenomenon known as a sundog arcs over the tundra in Churchill, Manitoba, Canada. Sundogs are fairly common occurrences in the Arctic and Antarctic. They form when the sun is near the horizon and ice crystals high in the sky line up in a way that bends the solar rays like a prism.

This is amazing, isn’t it? So I continued searching:

A sun dog or sundog (scientific name parhelion, plural parhelia, for “beside the sun”) is a common bright circular spot on a solar halo. It is an atmospheric optical phenomenon primarily associated with the reflection or refraction of sunlight by small ice crystals making up cirrus or cirrostratus clouds. Often, two sun dogs can be seen (one on each side of the sun) simultaneously.

Sundogs typically, but not exclusively, appear when the sun is low, e.g. at sunrise and sunset, and the atmosphere is filled with ice crystal forming cirrus clouds, but diamond dust and ice fog can also produce them. They are often bright white patches of light looking much like the sun or a comet, and occasionally are confused with those phenomena. Sometimes they exhibit a spectrum of colours, ranging from red closest to the sun to a pale bluish tail stretching away from the sun. White sundogs are caused by light reflected off of atmospheric ice crystals, while colored sundogs are caused by light refracted through them. White sundogs are also thought to be caused by the light from the sun reflecting off of water on the ground and focusing the reflected light on the clouds above.

More info on the Wikipedia.

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