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Earth science 22.2


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Earth science 22.2

  1. 1. 22.2 The Earth-Moon-Sun System<br />
  2. 2. Rotation<br />The spinning of a body, such as Earth, about the axis.<br />
  3. 3. Revolution <br />The motion of one body about another, as Earth about the sun.<br />
  4. 4. Precession <br />A slow motion of Earth’s axis that traces out a cone over a period of 26,000 years.<br />
  5. 5. Perihelion<br />The point in the orbit of a planet where it is closest to the sun.<br />
  6. 6. Aphelion <br />The place in the orbit of a planet where the planet is farthest from the sun.<br />
  7. 7. Perigee<br />The point at which the moon is closest to Earth.<br />
  8. 8. Apogee<br />The point where the moon is farthest from Earth.<br />
  9. 9. Phases of the Moon<br />The progression of changes in the moon’s appearance during the month.<br />
  10. 10. Solar Eclipse <br />A eclipse of the sun; this occurs when the moon moves in a line directly between Earth and the sun, casting a shadow on Earth.<br />
  11. 11. Lunar Eclipse <br />An eclipse of the moon; occurs when the moon is in Earth’s shadow.<br />
  12. 12. Key Concept<br />The two main motions of Earth are rotation and revolution.<br />
  13. 13. Key Concept<br />Lunar phases are a result of the motion of the moon and the sunlight that is reflected from its surface.<br />
  14. 14. Key Concept<br />During a new-moon or full-moon phase, the moon’s orbit must cross the plane of the ecliptic for an eclipse to take place.<br />