What Causes Eclipses? Earth and Moon cast shadows.

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Presentation transcript:

What Causes Eclipses? Earth and Moon cast shadows. When either passes through the other’s shadow, we have an eclipse. Because the Sun is an extended bright object, there are two different regions of the shadow: Penumbra: partly illuminated. Umbra: completely dark Credit: Lunar and Planetary Institute

Lunar eclipses Lunar eclipses happens when the Moon passes through the shadow of the Earth Lunar eclipses can be partial, penumbral, or total. Lunar eclipses can occur only at full moon. Use the interactive figure to show the conditions for the 3 types of lunar eclipse. Credit: Lunar and Planetary Institute

When the Earth’s shadow covers the Moon, we have a lunar eclipse http://www.mreclipse.com/Special/LEprimer.html Additional details are at http://en.wikipedia.org/wiki/Lunar_eclipse When the Earth’s shadow covers the Moon, we have a lunar eclipse

Earth’s Umbra has a reddish color Solid Earth blocks direct sunlight. Earth’s atmosphere bends light. Earth’s atmosphere scatters blue light. Only red light fills the umbra.

Images from Fred Espanak and may be found at http://www.mreclipse.com/LEphoto/LEgallery1/LEgallery1.html Images from Fred Espenak http://www.mreclipse.com/LEphoto/LEgallery1/LEgallery1.html

Total Lunar Eclipse: Moon passes completely into total shadow of Earth (Umbra)