Lunar eclipse - Wikipedia, the free encyclopedia
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A lunar eclipse is an eclipse which occurs whenever the moon passes behind the earth such that the earth blocks the sun’s rays from striking the moon. This can occur only when the Sun, Earth, and Mo...
en.wikipedia.org/wiki/Lunar_eclipse
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The area (volume) in full shadow is the umbra, the boundary area the penumbra. ... (The graphic is actually inaccurate, since the penumbra doesn't have a constant shadow density, but rather a gradient ranging from shadow to light) ... illustration of umbra/penumbra...
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www.schorsch.com/kbase/glossary/penumbra.html
www.schorsch.com/kbase/glossary/penumbra.html
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There are two parts to these shadows. The umbra is a central cone of darkness which tapers away from the Earth or Moon, whilst the penumbra is an outer cone of partial shadow which diverges instead of tapering.
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www.inconstantmoon.com/cyc_ecl1.htm
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This page is a basic introduction and explanation of how lunar eclipses take place. It includes a preview to upcoming eclipses of the Moon. ... Geometry of the Sun, Earth and Moon During an Eclipse of the Moon; Earth's two shadows are the penumbra and the umbra. (Sizes and distances not to scale)
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www.mreclipse.com/Special/LEprimer.html
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MORE ABOUT SHADOWS: UMBRA and PENUMBRA ... An exciting example of the umbra/penumbra effect occurs during a solar eclipse. The Moon passes between the Earth and the Sun, and forms a shadow on the Earth. Because the Sun is not a point source of light, there will be both umbra and penumbra shadows produced on the Earth.
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www.learner.org/workshops/sheddinglight/highlights/high...
www.learner.org/workshops/sheddinglight/highlights/highlights1.html
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To distinguish umbra from penumbra. ... penumbral shadow eclipse penumbra umbra ... The shadows...
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www.edumedia-sciences.com/en/a303-umbra-and-penumbra
www.edumedia-sciences.com/en/a303-umbra-and-penumbra
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Science animation - Improve your understanding about the concept of shadows and how Umbra and Penumbra are formed by this simulation. ... Shadows Umbra & Penumbra - Free interactive simulation...
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www.goalfinder.com/downloads_shadows.asp
www.goalfinder.com/downloads_shadows.asp
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The Figure shows the geometry for finding the size of the shadows. The properties of similar triangles is all that is needed. The penumbra and umbra are noted. Try to imagine what the sun looks like from points in the penumbra.
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www.du.edu/~jcalvert/astro/shadows.htm
www.du.edu/~jcalvert/astro/shadows.htm
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Information from hermit.org on solar and lunar eclipses. ... As seen from the Earth, the penumbra and umbra form 2 concentric circles, through which the Moon passes during an eclipse. The type of eclipse seen depends on how close the Moon passes to the center of the shadow, as shown here:
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www.hermit.org/Eclipse/why_lunar.html
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