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Eclipses

Eclipses. Lunar and Solar Eclipses. Sun and Moon have almost the same angular diameters. Each subtend an angle ~ ½ degree Sun is 400 times larger than the Moon and 400 times further away. Solar and Lunar Eclipses.

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Eclipses

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  1. Eclipses Lunar and Solar Eclipses

  2. Sun and Moon have almost the same angular diameters • Each subtend an angle ~ ½ degree • Sun is 400 times larger than the Moon and 400 times further away

  3. Solar and Lunar Eclipses • Everyone on Dark side of Earth sees a Lunar Eclipse, only a few will see a solar eclipse – shadow sizes!

  4. Slight change in lunar size due to its elliptical orbit around the Earth • Causes annular and total solar eclipses

  5. Total Solar Eclipse • Moon’s shadow barely reaches the Earth

  6. Lunar Eclipse • Earth Shadow easily covers the Moon

  7. Total Solar Eclipse • Eclipse Path and Partial Eclipse

  8. Solar Eclipses • Corona, comets and diamond ring effect

  9. Annular Eclipse • Moon near apogee (too far away)

  10. Lunar Eclipse is often Reddish • Due to refraction of Earth’s atmosphere

  11. Red Color and Earth’s Shadow • Red color near edges of shadow

  12. Eclipses occur ~ every 6 months • Line of nodes must point toward the Sun • The alignment is not exact (eclipse limits)

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