What's the Time?

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Across
  1. 2. satellited that travels around Earth
  2. 3. the Earth takes 365 days to travel around this
  3. 5. worked out the 'amount' of something
  4. 7. twelve months
  5. 8. when the part of Earth we live in is not facing sun
Down
  1. 1. thing used for measuring
  2. 4. twenty four hours
  3. 6. one of the first instruments to measure time
  4. 9. sixty minutes