Crossword Puzzle

123456789
Across
  1. 4. Twilight, nightfall
  2. 5. A span of a thousand years
  3. 6. Active in the day
  4. 8. Happening before the proper time
  5. 9. Happening every hundred years
Down
  1. 1. Lasting a short time
  2. 2. Active at night
  3. 3. Happening from time to time
  4. 7. Noteworthy period of time