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Lunar Eclipse

Lunar Eclipse. Chapter 3 from book. Objectives. To be able to describe the phenomenon of how a lunar eclipse occurs. To be able to apply what they already know about the moons orbit to this “special case.”

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Lunar Eclipse

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  1. Lunar Eclipse Chapter 3 from book

  2. Objectives • To be able to describe the phenomenon of how a lunar eclipse occurs. • To be able to apply what they already know about the moons orbit to this “special case.” • To apply what they know about the wavelengths of light to the appearance of the moon during the eclipse.

  3. Lunar Eclipse • http://www.youtube.com/watch?v=wuhNZejHeBg • This is a brief video from NASA explaining how a lunar eclipse works.

  4. Lunar Eclipse Take note of the components of Earth’s shadow, the umbra and penumbra and the role they play in the lunar eclipse

  5. Lunar Eclipse • Moon is tipped only a few degrees from the plane of Earth’s orbit around the sun. • Earth’s shadow points directly away from the sun (also on the plane of Earth’s orbit). • Thus a lunar eclipse occurs when the Moon’s path carries it directly through the shadow of the Earth.

  6. Umbra • This is the region of total shadow • From the book: • If you were drifting in your space suit in the umbra of Earth’s shadow, the sun would be completely hidden behind Earth.

  7. Penumbra • Again, if you are drifting in your space suit: • In the penumbra, you would see part of the sun peeking around the edge of Earth. • You would be in partial shadow. • Sunlight is dimmed but not “extinguished” like in the umbra.

  8. At the Height of an Eclipse – in the Umbra

  9. Lunar Eclipse • Generally most full moons pass north or south of Earth’s shadow and there is no eclipse. • There are partial eclipses and total eclipses. • Partial Eclipse – When the moon passes a bit too far north or south of Earth, it may only partially enter the umbra. • Usually cannot see the coppery glow.

  10. Total Lunar Eclipse • During a total eclipse, the moon moves into the penumbra where it dims slightly. • As it moves, the dimming increases. • Finally it reaches the umbra where the moon begins to darken as it slides into the umbra. • When it is totally eclipsed, the moon does not disappear.

  11. Total Lunar Eclipse • The moon does not receive direct sunlight but light waves in the red spectrum are bent around Earth. • They pass through the Earth’s atmosphere. • Blue light, much shorter wavelength, is scattered as it hits the atmosphere (which is why the sky is blue). • Red light continues on and does reach the moon, creating its reddish glow.

  12. Total Lunar Eclipse • An eclipse can last for as much as 1 hour 45 minutes. • http://www.youtube.com/watch?v=lcRp1jKJmJU • You Tube video of a “speeded up” lunar eclipse.

  13. Review • Could a solar-powered spacecraft generate any electricity while passing through Earth’s umbral shadow? • If a lunar eclipse occurred at midnight, where in the sky would you look to see it?

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