Science puzzle

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Across
  1. 3. equal amount of day and night
  2. 5. Winter, spring, summer, and fall
  3. 6. Causes day and night
  4. 8. on a 23.5 degree angle
  5. 9. hemisphere bottom half of Earth
  6. 10. circular path that goes around something
  7. 11. Hemisphere top half of Earth
Down
  1. 1. center line of Earth
  2. 2. sun is at its maximum or minimum declination
  3. 4. Hours lasts 12 hours
  4. 6. object twirling around another
  5. 7. imaginary line