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Understanding Eclipses: Lunar and Solar Phenomena

Learn about eclipses and their different types, including lunar and solar eclipses. Discover the reasons behind their rarity and explore the concepts of umbra and penumbra. A helpful guide with illustrations.

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Understanding Eclipses: Lunar and Solar Phenomena

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  1. Eclipses (23)

  2. Eclipses occur when the moon or sun moves into the moon’s or Earth’s shadow. • Parts of a shadow: • Umbra: total shadow – complete eclipse. • Penumbra: partial shadow – partial eclipse (dimmed).

  3. Lunar Eclipse • Can ONLY happen during a full moon. • Moon moves into earth’s shadow.

  4. Lunar Eclipse (cont.) • Moon moves into the penumbra and dims. • As it gets closer to umbra it gets darker. • Typically lasts about 2 hrs.

  5. Lunar Eclipses (cont.) • Some light coming around the earth can make the moon look red/brown. • About 2 lunar eclipses/year. • Easy to see, needs to be night time (where you are) when the moon passes through the earth’s shadow.

  6. Next lunar eclipse will be June 4th (partial). • Also one on Nov. 28th but we won’t be able to see it here.

  7. Solar Eclipse • May only occur during a new moon. • Sun is in moon’s shadow.

  8. Solar Eclipse (cont.) • Total solar eclipses are rare to see because the moon’s umbra is small. • Outside of the moon’s umbra no eclipse is seen. • Becomes so dark other stars can be seen. • Last only a few min.

  9. Solar Eclipses (cont.) • Last solar eclipse: July 11, 2010 • Seen only from the Pacific Islands and South America. • Next solar eclipse we can see: August 21, 2017.

  10. Frequency of Eclipses • Earth’s and moon’s orbits are elliptical. • Distances between them vary slightly. • Shadow sizes change. • Moon’s orbit is tipped slightly to earth’s and it often misses the earth’s shadow.

  11. Eclipse Foldables (22) • Answer the following questions at the bottom of your page: • Give 2 reasons why eclipses don’t happen more often. • Why is it more rare to see a solar eclipse than a lunar eclipse? • Each Foldable needs: • Term, Explanation, & Illustration. • Umbra • Penumbra • Solar Eclipse • Lunar Eclipse

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