NASA: Eclipse shadow cones
By: Melissa Hudson
Posted: Aug 18, 2017 3:43 PM EDT
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NASA - A solar eclipse occurs when the Moon's shadow falls on the Earth. The shadow comprises two concentric cones called the umbra and the penumbra. Within the smaller, central umbra, the Sun is completely blocked by the Moon, and anyone inside the umbra sees a total eclipse. Within the larger penumbra, the Sun is only partially blocked.
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Visualization by Ernie Wright/NASA
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