Vocab

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Author:
milkymoo
ID:
259401
Filename:
Vocab
Updated:
2014-01-31 09:17:15
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science
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  1. astronomy
    the scientific study of the universe; It includes the observation and interpretation of celestial bodies and phenomena.
  2. geocentric
    describes the concept of an Earth-centered universe
  3. heliocentric
    describes the view that the sun is at the center of the solar system
  4. retrograde motion
    the apparent westward motion of the planets with respect to the stars
  5. ellipse
    an oval
  6. astronomical unit (AU)
    average distance from Earth to the sun; 1.5 × 108, or 150 million kilometers
  7. rotation
    the spinning of a body, such as Earth, about its axis
  8. revolution
    the motion of one body about another, as Earth about the sun
  9. precession
    a slow motion of Earth’s axis that traces out a cone over a period of 26,000 years
  10. perihelion
    the point in the orbit of a planet where it is closest to the sun
  11. aphelion
    the place in the orbit of a planet where the planet is farthest from the sun

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