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Yosemite waterfall turns to lava as sun and earth align

posted Feb 20, 2012, 4:18 PM by Gary Jones
Four decades ago, photographers had only to point and shoot to capture another famous Yosemite firefall — a man-made cascade of embers pushed from a bonfire on summer nights from Glacier Point.

But photographing Horsetail is a lesson in astronomy, physics and geometry as hopefuls consider the azimuth degrees and minutes of the earth's orbit relative to the sun to determine the optimal day to experience it.

Read more HERE

(I remember seeing the man-made firefalls when I was boy.)
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