Earth's shadow will darken part of the moon Wednesday morning (March 23) in a lunar eclipse that will be visible from much of the globe, including central and western North America. Wednesday's lunar eclipse is of the penumbral variety, and the effect will therefore be subtle and subdued compared to the jaw-dropping "blood moons" caused by total lunar eclipses. Earth's shadow is composed of two parts: the dark, inner umbra and a faint, outer portion called the penumbra.
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