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Because ancient astronomers both travelled themselves and wrote to each other. Having observed that midday shadows vary in length depending upon latitude (but not longitude), it's just a matter of finding a long enough baseline to make the calculation easy.
Any of you clever bods know on 10:12 - Aug 24 by Guthrum
Because ancient astronomers both travelled themselves and wrote to each other. Having observed that midday shadows vary in length depending upon latitude (but not longitude), it's just a matter of finding a long enough baseline to make the calculation easy.