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Lunar cycle

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Lunar cycle Lunar cycle Presentation Transcript

  • The Lunar Cycle
  • Light seen from the moon is reflected sunlightAs moon moves around earth, different parts of it areilluminated and visible to usDifferent shapes of reflected sunlight are called phases
  • Phases of the MoonNew moon – when moon is between sun and earthand not illuminated (it’s dark)
  • Phases of the Moon Waxing – name used whenthe lit part of moon isincreasing Waxing-crescent phase –when a sliver of moonbecomes visible
  • Phases of the MoonFirst-quarter – when the waxing moon becomes ahalf-circlecalled “first-quarter” because moon is a quarter of the wayin it’s orbit
  • Phases of the MoonWaxing – gibbous – when the visible portion of themoon is larger than a half-circle and is increasing
  • Phases of the Moon Full moon – when the moonappears as a full circle Earth is between the moonand sun
  • Phases of the MoonWaning – when the lit part of the moon is decreasingWaning-gibbous – lit part of moon still bigger thanhalf-circle but shrinking
  • Phases of the Moon Last-quarter - when thewaning moon becomes a half-circle called “last-quarter”because moon is at the lastquarter of the way in it’sorbit
  • Phases of the MoonWaning-crescent - when a sliver of moon is all that’svisible moon moves into “new moon” phase afterwaning crescent to begin cycle again
  • Earthshineon either side of a new moon, the darkened part ofmoon is slightly visible – “earthshine”
  • http://www.youtube.com/watch?v=79M2lSVZiY4http://www.youtube.com/watch?v=WGTBJHFNywI
  • earthshine
  • Waning-gibbous
  • Waxing-crescent
  • Waning-crescent
  • Last quarter
  • Full moon
  • What does “waning” mean?
  • when the lit part of the moon is decreasing
  • What is earthshine?
  • When the darkened part of the moon is slightly visible