Truzi
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I am well aware of Eratosthenes' calculation of earth circumference, but you really think his works were "well known" by Columbus contemporaries? How come then that Columbus is held responsible for proving that the Earth is not flat among the general population?
https://www.washingtonpost.com/opin...e5-b31c-d80d62b53e28_story.html?noredirect=on
and again (this time a fragment identifier link to Middle Ages):
https://en.wikipedia.org/wiki/Spherical_Earth#Middle_Ages
Note the occurrence of the term "vernacular," suggesting non-specialists... the "general population."
Another fragment identifier link that mentions "vernacular:"
https://en.wikipedia.org/wiki/Spherical_Earth#High_and_late_medieval_Europe