How is time calculated?

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  1. #equal
  2. #crossover
  3. #rotation
  4. #observing
  5. #distant
  6. #would
  7. #hours
  8. #meridian
  9. #approximately
  10. #longitude
  11. #degree
  12. #difference
  13. #complete
  14. #minutes
  15. #greenwich
  16. #trough
  17. #between
  18. #calculated
  19. #stars