#Umbra vs penumbra how to#

To observers on Earth who are within the penumbra, the Sun appears to be partially covered by the Moon, so those observers see a partial eclipse. To observers on Earth within the narrow strip of land over which the umbra passes, the Sun appears to be completely covered by the Moon. This shadow consists of two parts: the umbra and the penumbra. NARRATOR: A solar eclipse occurs when the Moon moves between the Earth and the Sun in such a way that its shadow sweeps over the surface of the Earth.

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#Umbra vs penumbra how to#

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