Daily Almanac for
May 27, 2012
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What Does It Mean?
penumbra
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During an eclipse, the earth's penumbra darkens the sky. How is this possible?

a.) The earth casts a partial shadow across the moon.

b.) The earth emits a gaseous cloud that blocks the moon's illumination.

c.) The earth deviates from orbit, blocking the moon for several minutes.



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