Why does the earth have a 23.5 degree tilt?

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Tags

1. #exerted
2. #plane
3. #planets
4. #changes
5. #planet
6. #between
7. #orbital
8. #rotation
9. #torque
10. #axial
11. #influence
12. #direction
13. #perpendicular
14. #precession
15. #since
16. #obliquity
17. #bulge
18. #equatorial
19. #other
20. #angle