It's about Time

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Across
  1. 5. marked by characteristics of the present period
  2. 6. done without planning; improvised
  3. 7. a historical account of events arranged in order of time
  4. 9. a long-time close friend
  5. 12. the science that deals with measuring time
  6. 13. covering the period of a year
  7. 14. happening twice a year
  8. 15. something that seems to be out of its proper time
  9. 16. the rate of speed of a musical piece
Down
  1. 1. lasting for a limited time
  2. 2. not happening at the same time as
  3. 3. continuing or occurring again and again for a long time
  4. 4. having to do with finite time
  5. 5. a 100th anniversary
  6. 8. present at all seasons of the year
  7. 10. a record of events arranged in a yearly sequence
  8. 11. to make something happen at the same time