Motions of the Earth

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Across
  1. 2. In -- season Christmas is celebrated in Australia
  2. 5. circle of -- divides the globe into day and night
  3. 6. Motion of the earth around the sun
  4. 9. Change of seasons occurs on earth due to
  5. 10. -- 21 is the longest day and the shortest night occur in the northern hemisphere
Down
  1. 1. day and night are of equal length
  2. 2. the source of light on the earth
  3. 3. Motion of the earth on its axis in about 24 hours
  4. 4. The period of one rotation of the earth is known as -- day
  5. 6. Days and nights occur on earth due to
  6. 7. A year with 366 days
  7. 8. Who first claimed that the earth revolves spherically around the sun?