rotation and revolution

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Across
  1. 2. time of longest day or longest night
  2. 3. The inky dark vacuum
  3. 5. The continued revolution of a planet around a star
  4. 7. the planet we live on.
  5. 8. the imaginary line through our planet.
  6. 9. this creates day and night.
Down
  1. 1. this creates years.
  2. 2. times of different temperatures.
  3. 4. time of equal day and night
  4. 6. the time when the sun is facing at the earth