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lunar eclipse
Lunar
That's when we have a lunar eclipse.
"Umbra" means "shadow". When the Moon enters the Earth's shadow, we call that a "total lunar eclipse".
When the moon is hidden by Earth's shadow, it is known as a lunar eclipse. This occurs when the Earth comes between the sun and the moon, casting a shadow on the moon. Depending on the alignment, the moon may appear red or copper-colored during a total lunar eclipse.