Days, Years, Seasons

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Across
  1. 3. the medium-sized star at the center of our solar system
  2. 4. a lean, incline, slope or slant
  3. 6. the imaginary line about which a celestial body rotates
  4. 9. the path that a body follows as it travels around another body in space
  5. 11. the time required for the Earth to orbit once around the sun
  6. 13. an imaginary line drawn around Earth equally distant from both poles, dividing Earth into two hemispheres
  7. 15. spinning motion of a planet on its axis
  8. 16. a division of the year determined by Earth's tilt relative to the Sun & Earth's position in its orbit
Down
  1. 1. a celestial body that orbits a star, is large enough to have become rounded by its own gravity & has cleared the area of its orbit
  2. 2. the time it takes a planet to make one orbit around the Sun
  3. 5. the time required for Earth to rotate once on its axis
  4. 7. a natural or artificial body that orbits another body in space
  5. 8. the two days per year when the sun is at its greatest distance from the equator
  6. 10. a force of attraction between objects that depends on mass & distance
  7. 12. the two days per year when days and nights are of equal length as neither hemisphere is tilted toward or away from the Sun
  8. 14. change in position relative to a reference point