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Aristotle figured out the earth was round 2,300 yrs ago through simple reasoning

he noticed that the earth’s shadow on the moon always ...
'"''"'''"
  04/10/26
if the moon is round and the sun is round, well...
barnabyjones
  04/10/26
Eratosthenes, like most educated Greeks, knew the Earth was ...
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  04/10/26


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Date: April 10th, 2026 11:46 AM
Author: '"''"'''"

he noticed that the earth’s shadow on the moon always had a curved edge no matter what time of the year it was and reasoned that the only shape that casts a round shadow from every direction is a sphere

(http://www.autoadmit.com/thread.php?thread_id=5855723&forum_id=2)#49808585)



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Date: April 10th, 2026 11:48 AM
Author: barnabyjones

if the moon is round and the sun is round, well...

(http://www.autoadmit.com/thread.php?thread_id=5855723&forum_id=2)#49808589)



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Date: April 10th, 2026 12:22 PM
Author: ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,


Eratosthenes, like most educated Greeks, knew the Earth was round and he calculated its size within 5% by measuring concurrent shadow angles in Egypt and Greece.

(http://www.autoadmit.com/thread.php?thread_id=5855723&forum_id=2)#49808678)