*sigh* But St Bede wasn't from Medieval times, but 500 years before. What evidence is there to suggest he viewed sphere earth in the same way as Aristotle or Ptolemy?
Or...could one interpretation of "sphere" refer to the atmosphere dome?
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No. The atmosphere is not the earth. The earth is made of rock, dirt, water, trees, and so on. The atmosphere is made of gas. I really don't understand why you are so confused about the meaning of such simple terms.
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Thirdly, what evidence is there to suggest that St Augustine viewed "sphere" in the same way as Aristotle? Further, Did St Bede reference St Augustine? Just because they used the word "sphere" doesn't mean they meant the same thing.
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The word "sphere" has a single, universally understood meaning. You are the only person in this thread who seems to have trouble understanding the meaning of such common words as "earth", "air", "atmosphere", "flat", "round" and "sphere".