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Warm-up

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  1. Warm-up • Take out your science notebooks. • In the notes section, on a blank sheet of paper complete the following activity. • Draw the diagram. Fill in the correct phases of the moon as seen from earth. Label each phase. Earth Sun

  2. Eclipses and Tides http://solarsystem.nasa.gov/multimedia/gallery/Earth_Moon.jpg

  3. Intro • The Moon orbits at an angle with respect to the Earth’s orbit around the Sun. Ecliptic plane Moon’s orbital plane

  4. Eclipses • Two kinds: Solar and Lunar

  5. Vocabulary Umbra - is the innermost and darkest part of a shadow, where the light source is completely blocked. An observer in the umbra experiences a total eclipse. Penumbra -is the region in which only a portion of the light source is blocked. An observer in the penumbra experiences a partial eclipse.

  6. Solar Eclipse • When the Moon’s shadow covers part of Earth • Moon is in between Sun and Earth • When viewed from Earth, moon covers part or all of sun • Only happens at New Moon

  7. Total Solar Eclipse • Observers in the “umbra” shadow see a total eclipse (safe to view the Sun); can see the corona • Those in “penumbra” see a partial eclipse—not safe to look directly at Sun • Only lasts a few minutes • Path of Totality about 10,000 miles long, only 100 miles wide

  8. Photo of a Total Eclipse http://sunearthday.nasa.gov/2006/multimedia/gal_008.php

  9. Eclipses • Lunar eclipse: A lunar eclipse occurs when the moon passes through the shadow of the earth. • Can be partial or full eclipse

  10. When the Earth’s shadow covers the Moon, we have a lunar eclipse

  11. Why is the Moon red during an eclipse? • The Earth’s atmosphere filters some sunlight and allows it to reach the Moon’s surface • The blue light is removed—scattered down to make a blue sky over those in daytime • Remaining light is red or orange • Some of this remaining light is bent or refracted so that a small fraction of it reaches the Moon • Exact appearance depends on dust and clouds in the Earth’s atmosphere

  12. Sun Earth Moon

  13. Ellipse – elongated oval shape • Temperature – measured in Fahrenheit, Celsius and Kelvin • Greenhouse effect – trapping of gasses which doesn’t allow heat to escape – temperatures are extreme

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