Earth and Space

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Across
  1. 7. happens two times in a year during spring and autumn
  2. 8. an instance of revolving
  3. 9. a chart of pages showing the days
  4. 12. the envelope of gases surrounding the earth
  5. 13. the curved path at which the earth revolves around
  6. 14. an imaginary line at which a body rotates
  7. 16. relating to a planet
Down
  1. 1. a very large star of high luminosity and low surface temperature
  2. 2. resembling the moon
  3. 3. the most important part of something
  4. 4. the luminous envelope of a star from which its light and heat radiate
  5. 5. the action of rotating around and axis or center
  6. 6. the rarefied gaseous envelope of the sun and other stars
  7. 10. the study of the moon and stars
  8. 11. happens two times a year during summer and winter
  9. 15. relating to or determined by the sun