Phases And Eclipses

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  • 1. The moon does not make its own light. We see it because it reflects light from the sun. The terminator is the moving boundary between day and night. Notice that it moves right to left.
  • 2. Daytime on the moon Night on the moon Terminator
  • 3. Phases of the moon are caused by the angle between the earth, moon, and sun.
  • 4. Lunar Phase animation Another animation Notice that the terminator is moving right to left. Video clip on phases
  • 5. Waxing means getting bigger every night. Waning means getting smaller every night. Crescent means less than half the surface of the moon facing you is lit by the sun. Gibbous means more than half of the surface of the moon facing you is lit by the sun.
  • 6. Review this diagram and name the phases on the following slides!
  • 7. Waning crescent
  • 8. Waxing gibbous
  • 9. Waxing crescent
  • 10. Last quarter
  • 11. Waning crescent
  • 12. Waning gibbous
  • 13. First quarter
  • 14. Two kinds: Lunar eclipses Solar eclipses Video clip on eclipses
  • 15. Eclipse animation
  • 16. Time lapse photography of a lunar eclipse
  • 17. Animation of solar eclipse
  • 18. Diamond ring effect just before or after a total solar eclipse.
  • 19. This animation shows the relative sizes of the partial and total eclipse areas. The small, black dot is the umbra. You can see why not many people ever see a total eclipse.
  • 20. This is a space shuttle photograph of an area of the Earth having a total solar eclipse.
  • 21. Link to NASA eclipse page Be sure to scroll down for a list of upcoming eclipses.