Theme: Astronomy

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Across
  1. 3. A period of one thousand years
  2. 6. A period of time equal to a twenty-fourth part of a day
  3. 8. A period of one hundred years
  4. 9. A period of ten years
Down
  1. 1. A period of time equal to sixty seconds
  2. 2. A short moment in time
  3. 4. A period of time roughly based on the moon's orbit
  4. 5. A period of twelve months
  5. 7. A period of seven days
  6. 9. A period of twenty-four hours as a unit of time