Astronomical cycles

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Across
  1. 2. Causes differential heating between the hemispheres
  2. 6. Length of the day during NZ summer solstice
  3. 7. the imaginary linethat receives the most sunlight
  4. 8. Is there a place that receives no sunlight (Ya or Na)
  5. 10. Opposite of North
  6. 11. In Scotland in June it is what season?
  7. 12. Periodic variation in sea level due to the pull of the moon and sun
Down
  1. 1. What do you call a never setting sun?
  2. 3. The Earth's axis is tilted by this amount (XX.5)
  3. 4. One of the fundamental forces in nature
  4. 5. Winter, Spring, Autumn, Summer
  5. 9. the longest day in the year (two words)