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"Umbra" means "shadow". When the Moon enters the Earth's shadow, we call that a "total lunar eclipse".
It Rotates, and is called penumbra
No, they see night-time. You can see a lunar eclipse (from anywhere) when the MOON is in the earth's umbra.
The Earth's umbra is the central, darkest part of its shadow. During a lunar eclipse, when the Earth passes between the Sun and the Moon, the Moon enters the Earth's umbra, causing it to darken and sometimes turn a reddish color.
The darkest part of the moon is called the Umbra. That is the darkest not the largest.