What is the 26000 year cycle?

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  1. #earth
  2. #approximately
  3. #precession
  4. #wobble
  5. #rotational
  6. #circle
  7. #direction
  8. #around
  9. #years
  10. #through
  11. #revolution
  12. #points
  13. #technically
  14. #cycle
  15. #complete
  16. #which
  17. #called
  18. #takes