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Suppose Eratosthenes had found that, in Alexandria, at noon on the first day of summer, the line to the Sun makes an angle 30° with the vertical. What, then, would he have found for Earth’s circumference?

Astronomy by Geoffrey0 comments

1. Suppose Eratosthenes had found that, in Alexandria, at noon on the first day of summer, the line to the Sun makes […]

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