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You do, in the exact same way firsts physicians did. The simplest first steps to garner that understanding were made by Eratostenes, and you can read his method.
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You do, in the exact same way firsts physicians did. The simplest first steps to garner that understanding were made by Eratostenes, and you can read his method.
How do we know if the earth is flat or round? A lot of pilots say it's flat. I have no way of knowing.