Assertion: moon's shadow | /r/Synonym | the penumbra
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text: There will also be some time before and after when the moon is in the lighter part of Earth's shadow, which is called the penumbra.
text: Not as spectacular – or noticeable – as a total lunar eclipse, a penumbral lunar eclipse is a rather subtle phenomenon that occurs when the full moon moves through the outer part of Earth’s shadow (known as the penumbra), according to EarthSky.org.