It's [the World's] Shape Has The Rounded Appearance Of A Perfect Sphere.

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It's [the world's] shape has the rounded appearance of a perfect
sphere. This is shown first of all by the name of 'orb' which is
bestowed upon it by the general consent of mankind. ...[O]ur eyesight
also confirms this belief, because the firmament pre
sents the aspect of a concave hemisphere equidistant in every direction,
which would be impossible in the case of any other figure.
-- Gaius Plinius Secundus, Natural History, 77 A.D.

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