06-23-2012, 04:56 PM
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#11
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The Un-Tuckian
Join Date: Apr 2007
Location: South Central...KY that is
Posts: 39,517
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from APOD
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Explanation: As seen from Frösön Island in northern Sweden the Sun did set a day after the summer solstice. From that location below the arctic circle it settled slowly behind the northern horizon. During the sunset's final minute, this remarkable sequence of 7 images follows the distorted edge of the solar disk as it just disappears against a distant tree line, capturing both a green and blue flash. Not a myth even in a land of runes, the colorful but elusive glints are caused by atmospheric refraction enhanced by long, low, sight lines and strong atmospheric temperature gradients.
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