Phases Of The Moon

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High School Astronomy

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Phases Of The Moon

  1. 2. Phases of the Moon
  2. 4. What causes the Moon's phases? <ul><li>The phases the Moon goes through are caused by two things: 1) the Moon revolving around the Earth, and 2) the Moon reflecting sunlight towards the Earth.  Half of the Moon is always lit, not just the portion we see:  however, sometimes we only see a profile of the lit portion of the Moon.  Certain phases of the Moon result depending on its orbit, and the Moon's orbit is responsible for the phase changes we see. </li></ul>
  3. 6. The Phase of the Moon <ul><li>Since we only see the lit portion of the Moon that is facing Earth, we see a Moon phase.  There are eight phases that the moon goes through and they always occur in the same order.  The Sun's light seems to move from right to left across the surface of the Moon.  The phases of the Moon are: 1) New Moon, 2) Waxing Crescent, 3) First Quarter, 4) Waxing Gibbous, 5) Full Moon, 6) Waning Gibbous, 7) Last Quarter, 8) Waning Crescent, and back to the New Moon.  </li></ul>
  4. 7. Waxing Crescent   <ul><li>During the Waxing Crescent phase, we see on the right side a small sliver of the lit Moon.  </li></ul>
  5. 8. First Quarter <ul><li>During the First Quarter phase, we see the right half of the lit Moon.  The Moon and Earth are now &quot;side by side&quot; in their orbits around the Sun.  </li></ul>
  6. 10. Waxing Gibbous <ul><li>During the Waxing Gibbous phase, we see almost the entire right side of the lit Moon. </li></ul>
  7. 12. Full Moon <ul><li>During a Full Moon, we see the entire half of the Moon surface that is lit.  The Moon is positioned behind the Earth and Sun. </li></ul>
  8. 15. Waning Gibbous  <ul><li>During the Waning Gibbous phase, we see almost the entire left side of the lit Moon. </li></ul>
  9. 16. Last Quarter  <ul><li>During the last Quarter phase, we see the left half of the Moon lit.  The Moon and Earth are now &quot;side by side&quot; in their orbits around the Sun. </li></ul>
  10. 17. Waning Crescent  <ul><li>During the Waning Crescent phase, we see on the left side a small sliver of the lit Moon. </li></ul>

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