Earth science 22.2
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Earth science 22.2

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Earth science 22.2 Earth science 22.2 Presentation Transcript

  • 22.2 The Earth-Moon-Sun System
  • Rotation
    The spinning of a body, such as Earth, about the axis.
  • Revolution
    The motion of one body about another, as Earth about the sun.
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  • Precession
    A slow motion of Earth’s axis that traces out a cone over a period of 26,000 years.
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  • Perihelion
    The point in the orbit of a planet where it is closest to the sun.
  • Aphelion
    The place in the orbit of a planet where the planet is farthest from the sun.
  • Perigee
    The point at which the moon is closest to Earth.
  • Apogee
    The point where the moon is farthest from Earth.
  • Phases of the Moon
    The progression of changes in the moon’s appearance during the month.
  • Solar Eclipse
    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.
  • Lunar Eclipse
    An eclipse of the moon; occurs when the moon is in Earth’s shadow.
  • Key Concept
    The two main motions of Earth are rotation and revolution.
  • Key Concept
    Lunar phases are a result of the motion of the moon and the sunlight that is reflected from its surface.
  • Key Concept
    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.