Quizlet Ch. 18-1 Voc.

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  1. astronomy: the study of the moon, stars, and other objects in space
  2. autumnal equinox: The first day of Fall int he Northern hemisphere (around Sept. 22)
  3. axis: an imaginary line that passes through Earth about which the Earth rotates
  4. equinox: the 2 days of the year on which niether hemisphere is tilted toward or away from the sun
  5. latitude: the distance North or South of the equator
  6. orbit: the PATH of an object as it revolves around another object
  7. revolution: the movement of an object around another object
  8. rotation: the spinning motion of a planet about its axis
  9. solstice: the 2 days of the year when the sun is overhead at either 23.5 degrees North or South
  10. vernal equinox: The first day of Spring in the Northern hemisphere ( around March 22)