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The Phases of the Moon

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  1. The Phases of the Moon

  2. Is the Earth’s shadow is the cause of the Moon’s phases?

  3. NO

  4. True Scale of Earth-Moon System:

  5. Moon Takes About a Month (29.3 days) to go through all phases

  6. Phases: • New – Whole face is dark • Crescent – Looks like fingernail • First & Third Quarter -- Half lit • Gibbous – Latin gibbosus humpbacked • Full – Face is totally lit up

  7. Waxing – Getting Stronger (“wax poetic”) • Waning – Getting Weaker (“on the wane”)

  8. Moon Phases

  9. Phases caused by Moon’s orbit around Earth

  10. The time the moon is high above the southern horizon depends on what phase it is in.;

  11. When is the third quarter moon directly overhead? • A. 6 AM • B. Noon • C. 6 PM • D. Midnight

  12. When is the waxing crescent directly overhead? • A. 9 PM • B. 3 AM • C. 9 AM • D. 3 PM

  13. What time does the full moon rise? • A. 6 AM • B. Noon • C. 6 PM • D. Midnight

  14. The moon is full on March 30. What constellation is it in? • A. Taurus • B. Virgo • C. Capricornus • D. Gemini

  15. The Sun is in Gemini. You observe the moon is in Cancer. What phase is the moon in? The zodiacal constellations in the order the sun and moon pass through • Pisces • Aries • Taurus • Gemini • Cancer • Leo • Virgo • Libra • Scorpius • Sagittarius • Capricornus • Aquarius • first quarter • third quarter • waning crescent • waxing crescent • full

  16. True Scale of Earth-Moon System:

  17. Eclipses

  18. Eclipses occur when Sun, Earth, Moon are in Syzygy (i.e. all three are in a line)

  19. Moon in middle =“Solar eclipse”Earth in middle =“Lunar Eclipse” • It is an eclipse of whatever body appears dark as seen from earth

  20. Partial Eclipse – Moon not lined up to block out whole sun

  21. Eclipse movie (click to start)

  22. Where an Eclipse looks Total, andWhere it Looks Partial:

  23. Annular Eclipse = Moon too far away to eclipse whole sun

  24. During a solar eclipse, the moon must be in the ____ phase. • A. Full • B. New • C. Crescent • D. Gibbous • E. First Quarter

  25. Lunar Eclipse: Shadow of Earth Falls on Moon

  26. During a lunar eclipse, the moon must be in the ____ phase. • A. Full • B. New • C. Crescent • D. Gibbous • E. First Quarter

  27. Moon’s orbit is tilted 5 degrees from the ecliptic plane

  28. If the moon’s orbital plane was the same as the ecliptic plane, eclipses: • 1. Would occur more often • 2. Would occur less often • 3. Would occur at the same rate

  29. Eclipses would occur more often.Currently, can only occur when moon is at “nodes” (where moon’s path crosses ecliptic)

  30. If you were on the moon, you would see Earth go through phases.

  31. What phase is the Moon in?1. New, 2. Cresc, 3. Quarter 4. Gibbous 5 Full

  32. The Sun is in Pisces. You observe a first quarter moon. What constellation is it in? The zodiacal constellations in the order the sun and moon pass through • Pisces • Aries • Taurus • Gemini • Cancer • Leo • Virgo • Libra • Scorpius • Sagittarius • Capricornus • Aquarius • A. Pisces • Gemini • Virgo • Sagittarius

  33. The Sun is in Gemini. You observe a total lunar eclipse. What constellation is the moon in? The zodiacal constellations in the order the sun and moon pass through • Pisces • Aries • Taurus • Gemini • Cancer • Leo • Virgo • Libra • Scorpius • Sagittarius • Capricornus • Aquarius • A. Pisces • Gemini • Virgo • Sagittarius

  34. The moon is in the middle of a lunar eclipse on March 30. What constellation is it in? • A. Taurus • B. Virgo • C. Capricornus • D. Virgo