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8.5 Lunar Phases

8.5 Lunar Phases. Unit 8: Astronomy. Vocabulary. apogee : point at which the moon is farthest from the earth. Vocabulary. apogee : point at which the moon is farthest from the earth crescent: phase when less than half the moon is visible. Vocabulary.

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8.5 Lunar Phases

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  1. 8.5 Lunar Phases Unit 8: Astronomy Sanders

  2. Vocabulary • apogee: point at which the moon is farthest from the earth Unit 8: Astronomy

  3. Vocabulary • apogee: point at which the moon is farthest from the earth • crescent: phase when less than half the moon is visible Unit 8: Astronomy

  4. Vocabulary • apogee: point at which the moon is farthest from the earth • crescent: phase when less than half the moon is visible • gibbous: phase when more than half the moon is visible Unit 8: Astronomy

  5. Vocabulary • apogee: point at which the moon is farthest from the earth • crescent: phase when less than half the moon is visible • gibbous: phase when more than half the moon is visible • perigee: point at which the moon is closest to the earth Unit 8: Astronomy

  6. Vocabulary • apogee: point at which the moon is farthest from the earth • crescent: phase when less than half the moon is visible • gibbous: phase when more than half the moon is visible • perigee: point at which the moon is closest to the earth • phases: changing shapes of the moon Unit 8: Astronomy

  7. Months • It takes the moon 27.5 days to rotate once on its axis. Unit 8: Astronomy

  8. Months • It takes the moon 27.5 days to rotate once on its axis. • This is called a sidereal month. Unit 8: Astronomy

  9. Months • It takes the moon 27.5 days to rotate once on its axis. • This is called a sidereal month. • It is the time cycle that it takes moon to make one full orbit Unit 8: Astronomy

  10. Months • A complete cycle of the moon's phases takes 29.5 days. Unit 8: Astronomy

  11. Months • A complete cycle of the moon's phases takes 29.5 days. • This is called a synodic month. Unit 8: Astronomy

  12. Sidereal - Synodic? • This 2.5 day difference occurs because as the moon orbits Earth, Earth orbits the sun. Unit 8: Astronomy

  13. Sidereal - Synodic? • This 2.5 day difference occurs because as the moon orbits Earth, Earth orbits the sun. • When the moon gets back to its original position, it must move the extra distance to make up for the Earth’s travels in its orbit. Unit 8: Astronomy

  14. Unit 8: Astronomy

  15. Why do we see the same side of the moon? • To sum up; the periods of rotation and revolution for the moon are equal. Unit 8: Astronomy

  16. Why do we see the same side of the moon? • To sum up; the periods of rotation and revolution for the moon are equal. • Turn to page 15 of the ESRT. Unit 8: Astronomy

  17. Why do we see the same side of the moon? • To sum up; the periods of rotation and revolution for the moon are equal. • Turn to page 15 of the ESRT. Unit 8: Astronomy

  18. Unit 8: Astronomy

  19. Phases • Note that the waxing moon has light on the right side of the moon. • The waning side has light on the left. Unit 8: Astronomy

  20. Unit 8: Astronomy

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