Who proved earth was round?

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Tags

1. #using
2. #determining
3. #experiment
4. #geographer
5. #ancient
6. #greek
7. #locations
8. #circumference
9. #different
10. #calculate
11. #performed
12. #earth
13. #angle
14. #eratosthenes
15. #knowledge
16. #observed
17. #differences