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October Friday 21, 2016 at 14:35
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Today's Picture

On October 15, standing near the summit of Hawaii's Mauna Kea and looking away from a gorgeous sunset produced thismagnificent snapshot of a Full Moon rising withinthe volcanic mountain's shadow.An alignment across the Solar System is captured in thestunning scene and seeming contradiction of bright Moon in dark shadow.The triangular appearance of a shadow cast by a mountain's irregular profile is normal.It's created by the perspectiveof the distant mountaintop view through the dense atmosphere.Rising as the Sun sets, the antisolar point orthe point opposite the Sun is close to the perspective's vanishingpoint near the mountain shadow's peak.But extending in the antisolar direction, Earth's conical shadow isonly a few lunar diameters wide at the distance of the Moon. So October's Full Hunters Moon is still reflecting sunlight,seen through the mountain's atmospheric shadow butfound too far from the antisolar point and the Earth's extended shadow to be eclipsed.

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