Why is the Earth tilted at 23.5 degrees?

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Tags

1. #cycle
2. #earth
3. #changes
4. #about
5. #during
6. #tilted
7. #around
8. #years
9. #exaggerated
10. #between
11. #today
12. #plane
13. #seasons
14. #orbit
15. #varies
16. #become
17. #because
18. #averages
19. #degrees