The Reason for the Seasons

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Across
  1. 5. The shortest day of the year
  2. 7. September 23rd
  3. 10. The half of the Earth that is North of the Equator
  4. 12. Earth's orbital movement around the Sun
  5. 13. March 21st
Down
  1. 1. Southernmost part of the Earth
  2. 2. The one day of the year when the Earth is at it's maximum tilt towards the Sun
  3. 3. The half of the Earth that is South of the Equator
  4. 4. The Earth's _______ is the reason for the seasons
  5. 6. Imaginary line Earth spins around
  6. 8. Northernmost part of the Earth
  7. 9. The spinning of the Earth around its axis
  8. 11. Imaginary line splitting the Earth into two hemispheres