When the moon is only a thin crescent, the rest of it is dimly visible because on the dark side of the moon an almost full Earth is high above the horizon. In astronomy this is called "earthshine" or "ashen glow" but in old folklore people used to say that the young moon had the old moon in its arms. Nowadays scientific measurements of the brightness of earthshine are used to estimate the global cloud cover of the Earth, which might be an indication of global warming. Image and music © JKL / Pixel Idiots 2011

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Pixel Idiots

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