Reasons for the Season

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Across
  1. 3. Each of the four divisions of the year
  2. 8. To go around another object;orbit
Down
  1. 1. Longest/shortest day of the year
  2. 2. Spinning Motion
  3. 4. The star Earth orbits
  4. 5. When there is 12 hours of day and nighttime
  5. 6. The planet we live on
  6. 7. Half of a sphere