What is the length of one cycle of precession?

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  1. #caused
  2. #point
  3. #hipparchus
  4. #therefore
  5. #around
  6. #always
  7. #towards
  8. #starfield
  9. #precession
  10. #gravitational
  11. #celestial
  12. #about
  13. #estimated
  14. #first
  15. #period
  16. #years
  17. #earth
  18. #north