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An umbra is formed when an object blocks all of the light from a light source. A penumbra is formed when light from one source is blocked with light from another source filling in some of the shadow, OR when a large light source is only partially blocked.
http://www.learner.org/workshops/sheddinglight/highlights/highlights1.html
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How do the umbra and penumbra relate to eclipse?
The umbra is the darker total shadow; the penumbra is the surrounding partial shadow.
How do you use penumbra in a sentence?
During the eclipse, the penumbra is the outer part of the shadow where only partial sunlight is blocked.
What are the terms of umbra and penumbra and how do they relate to eclipses?
Shadows have two parts, the umbra and the penumbra. The umbra is the darker part of the shadow, in which all of the light from the source is blocked by the object casting the shadow. The penumbra, also known as the half-shadow, is the grayish part along the edge of a shadow in which only some of the light from the source is blocked.During a solar eclipse, if you are within the umbra of the moon's shadow, you are witnessing a total eclipse, and if you are within the penumbra of the moon's shadow, you are witnessing a partial eclipse.
When a solar eclipse does sunlight penetrate the umbra?
In a solar eclipse, no sunlight penetrates the umbra. This is because the umbra is basically the shadow of the Earth, so in this case, the Earth is receiving the sunlight from the Sun, while both the umbra and moon are in the dark.
What part of the moons shadow are you in if you see a total solar eclipse?
You are in the umbra, the darkest part of the moon's shadow, if you see a total solar eclipse. This is where the sun is completely blocked out, creating a moment of totality.
