How time difference is calculated?

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  1. #longitude
  2. #distant
  3. #hours
  4. #number
  5. #calculated
  6. #crossover
  7. #trough
  8. #difference
  9. #earth
  10. #minutes
  11. #observing
  12. #divided
  13. #stars
  14. #meridian
  15. #between