경과1_Leap-year

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Across
  1. 5. to change or develop slowly often into a better, more complex, or more advanced state;
  2. 6. the scientific study of stars, planets, and other objects in outer space
  3. 7. to gather or acquire (something) gradually as time passes
  4. 8. a year of 366 days instead of 365 with February having 29 days instead of 28
  5. 11. having (someone or something) as part of a group or total
  6. 14. to separate (something) into two or more parts or pieces
  7. 15. to have actual being, to be real
  8. 17. a final decision or judgment
  9. 18. happening once a year
  10. 19. ometimes but not often
  11. 20. to remove (something that is not wanted or needed), to get rid of (something)
Down
  1. 1. exactly
  2. 2. to have or include (someone or something) as a part of something
  3. 3. a change that makes something right, true, accurate, etc.
  4. 4. of or relating to the sun
  5. 9. something (such as an interesting fact or event) that can be observed and studied
  6. 10. of or relating to the moon
  7. 12. slowly, moderately and unhurriedly
  8. 13. the activity of doing something again and again in order to become better at it
  9. 14. to be about (something), to have (something) as a subject
  10. 16. the quality or state of something that is not easily changed or likely to change
  11. 21. a room or building with special equipment for doing scientific experiments and tests