Umbra: A shadow, particularly one cast during an eclipse

Umbra is Latin for shadow, and in astronomy it is used to described the shadow cast by one body onto another. The Moon casts an umbra unto the day side of the Earth during a solar eclipse and the Moon passes through the umbra of the Earth during a lunar eclipse. If you are standing in the penumbra, or partial shadow, in either situation, you should still be able to see part of the Sun shining around the eclipsing body.

If you’re wondering if this has any connection to the humble umbrella, yes, you have a small portable shadow that you can carry to keep the rain or sun off you!

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