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Understanding Lunar Phases: Apogee, Perigee, and the Moon's Cycle

Explore the fascinating world of lunar phases, including the definitions of apogee, perigee, crescent, and gibbous phases. Discover how these terms relate to the moon's distance from Earth and its visibility. Learn about the moon's orbital period, including the 27.5-day sidereal month and the 29.5-day synodic month, which describes the cycle of lunar phases. This educational overview provides insights into why we always see the same side of the moon and the waxing and waning phases.

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Understanding Lunar Phases: Apogee, Perigee, and the Moon's Cycle

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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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