Crossword Puzzle

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Across
  1. 3. Active at night
  2. 5. A span of a thousand years
  3. 7. Lasting a short time
  4. 8. Happening from time to time
  5. 9. Twilight, nightfall
Down
  1. 1. Active in the day
  2. 2. Happening before the proper time
  3. 4. Happening every hundred years
  4. 6. Noteworthy period of time